AAT3608
DATA SHEET
Compact Seven-Channel Regulator
with Li+/Polymer Linear Battery Charger and I2C Interface
1
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
202214A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • July 26, 2012
General Description
The AAT3608 is a member of Skyworks' Total Power
Management IC (TPMIC™) product family. It contains a
single-cell lithium ion/polymer battery charger, two
800mA switching regulators, and five low dropout (LDO)
regulators in a small Pb-free 40-pin 5mmx5mm TQFN
package, making it ideal for portable space-constrained
systems. The single-input linear charger powers up from
an adapter or a USB port. The adapter charge current is
programmable with an external resistor or pin selectable
between 100mA and 500mA when connected to a USB
port. The device integrates a load switch for dynamic
power path and features deep sleep mode operation. The
step-down regulators are monolithic synchronous con-
verters integrating the compensation network and soft
start circuitry. The 1.5MHz operating frequency enables
the use of tiny 2.2μH inductors and small 4.7μF output
capacitors. External resistors set the output voltage for
Buck 1 and Buck 2; the output voltage of Buck 2 is
dynamically adjustable with I2C. The LDO regulators fea-
ture 3% output voltage accuracy over the full operating
temperature range. The fast control loop of the LDO
regulators also provide excellent transient response with
a typical output voltage deviation of 1.5%. The AAT3608
provides protection features to safeguard from over-
temperature operation, over-current operation, and a
digital thermal loop to protect the battery during battery
charging. The device is rated over an ambient tempera-
ture range of -40°C to 85°C.
Features
• 2.7V to 5.5V Operating Input Voltage Range
• Adapter or USB Single Input Linear Charger
• Battery Charger Digital Thermal Regulation
• Battery Temperature Monitoring
• Battery Charger Includes Programmable Timer
• Input Load Switch
• Dual 800mA Monolithic Switching Converters
▪ 1.5MHz Switching Frequencies
▪ 95% Efficiency
▪ Independent Input Power and Ground
▪ Buck1 Output Programmable With External
Resistors
▪ Buck 2 Feedback Voltage is Dynamically Adjustable
between 0.5V and 0.7V with I2C Interface
• Five Channel LDO Regulators
▪ 300mA, Output Adjustable via Two Logic Inputs
▪ 80mA, Output Adjustable via I2C Interface
▪ 50mA, 2.5V Output Voltage
▪ 50mA, 3.3V Output Voltage
▪ 80mA with 1.2V Fixed Output
▪ 3% Accuracy and 1.5% Typical Transient Accuracy
• Very Low Shutdown Current
• Power-On Push Button
• Status Outputs
▪ Interrupt, Reset and Status Pins, Low Battery Flag
• Separate Enable Pin for LDO2, LDO4, LDO5, and
Buck2 (when mask is removed)
• Over-Current and Over-Thermal Protection
• 5mmx5mm, 40-Pin TQFN Package
Applications
• GPS
• Handheld Devices
• Mobile Media Players
• MP3
• Portable Navigation
AAT3608
DATA SHEET
Compact Seven-Channel Regulator
with Li+/Polymer Linear Battery Charger and I2C Interface
2Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
202214A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • July 26, 2012
Typical Application Circuit
SYSOUT
C13
PGND2
LDO1
LDO2
LDO3
LDO4
LDO5
Buck 2
C3 C1 C2
CSYSOUT
C10
C8
C12
L2
R6
V
IN
V
BAT
L1
C14C15C16C17
PGND1
STAT
ISETA
TS
CT
LDO2
INLDO
LDO3
LDO1
INLDO
LDO4
LDO5
PBSTAS
RESET
INT
LBO
LBI
GND
S2
S1
PWR_EN
FB2
LX2
INBUCK
LX1
FB1
BAT
SDA
SCL
PWR_HOLD
PWR_ON
EXT_ON
SYSOUT
SYSOUT
PWR_ID
PWR_IN
PWR_IN
USBSEL
AAT3608
PGND
R2
R3 R4
R5
Buck 1
PGND1
PGND2
BAT
AAT3608
DATA SHEET
Compact Seven-Channel Regulator
with Li+/Polymer Linear Battery Charger and I2C Interface
3
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
202214A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • July 26, 2012
Pin Descriptions
Pin # Symbol Function
1STAT Open drain (pull-down) output for battery charging status.
2ISETA Input pin for charge current programming for the adapter. Connect a 1.24kΩ resistor to get 800mA of charging current. Can be
used to monitor charging current.
3TS Battery temperature sense pin with 75μA output current. Connect the battery’s NTC 10kΩ resistor from this pin to ground.
A Beta range of 3300 to 4000 will place the typical charging temperature between -4°C and 48°C.
4CT Charger safety timer pin. A 0.1μF ceramic capacitor should be connected between this pin and GND. Connect directly to GND to
disable the timer function.
5LDO2 Output for LDO2 regulator.
6INLDO Input power for LDO regulators.
7LDO3 Output for LDO3 regulator.
8LDO1 Output for LDO1 regulator.
9INLDO Input power for LDO regulators.
10 LDO4 Output for LDO4 regulator.
11 LDO5 Output for LDO5 regulator.
12 PBSTAS Open drain (pull-down) output for PWR_ON status. When PWR_ON is high, PBSTAS will be low (after the debounce time). When
PWR_ON is low, PBSTAS will be high (or equal to the voltage to which that external pull-up resistor is connected).
13 RESET Open drain (pull-down) active-low output for reset. After Buck2 is OK, there is a delay of 200ms before RESET goes High. RESET
pin is low in shutdown.
14 INT Open drain (pull-down) active-low output for interrupt. When any of the I2C read bits (except the DS_RDY and PWR_DS bits)
change state this pin will pull low. It will be released again after a read from the I2C is complete.
15 LBO Open drain (pull-down) active-low output for low-battery comparator. When the battery is low, LBO will pull down.
16 LBI Feedback input for low-battery comparator. The LBI threshold is 1.0V.
17 GND Ground.
18 S2 S1 and S2 bits set the output voltage for LDO1.
19 S1 S1 and S2 bits set the output voltage for LDO1.
20 PWR_EN Enable for LDO2, LDO4, and LDO5 for default condition. Buck2 can also be controlled by PWR_EN only if the SOC masks
PWR_EN through I2C, refer to the "I2C Serial Interface and Programmability" section of this datasheet for additional information.
21 FB2 Feedback input for Buck2 regulator.
22 PGND2 Power ground for Buck2 regulator.
23 LX2 Switching node for Buck2 regulator.
24 INBUCK Input power for Buck regulators.
25 LX1 Switching node for Buck1 regulator.
26 PGND1 Power ground for Buck1 regulator.
27 FB1 Feedback input for Buck1 regulator.
28, 29 BAT Input for lithium-ion battery.
30 SDA I2C serial data pin.
31 SCL I2C serial clock pin.
32 PWR_HOLD Enable for the system. PWR_HOLD must be held high by the processor to keep system turned on. To shut down the device, the
microcontroller should pull PWR_HOLD to ground.
33 PWR_ON Enable for the system. Connect a push-button from this pin to BAT to activate system. It is debounced for 320ms.
34 EXT_ON Alternate system enable; may be used by the RTC alarm or other system input. This pin's function is similar to PWR_ON; it has a
similar 320ms debounce but does not affect the PBSTAS pin.
35, 36 SYSOUT System output. Connect to the INLDO and INBUCK input supply pins.
37 PWR_ID Logic input to identify the source of PWR_IN.
38, 39 PWR_IN Power Input. System input from adapter or USB.
40 USBSEL Logic input to select 500mA current limit and fast charge current (USBSEL=H) or 100mA current limit and fast charge
(USBSEL=L). An internal pull-down resistor is connected to this pin. If is left oating,USBSEL is pulled to ground.
EP EP For best thermal performance the exposed thermal pad must be thermally connected to a large exposed copper pad underneath
the package. Additionally, the exposed thermal pad (EP), GND, and PGND must be electrically connected to ground copper.
AAT3608
DATA SHEET
Compact Seven-Channel Regulator
with Li+/Polymer Linear Battery Charger and I2C Interface
4Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
202214A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • July 26, 2012
Pin Configuration
TQFN55-40
(Top View)
1
2
3
4
5
6
10
40 39 38 37 36 35 31
11 12 13 14 15 16
30
29
28
27
26
25
21
STAT
ISETA
TS
CT
LDO2
INLDO
LDO4
LDO5
PBSTAS
RESET
INT
LBO
LBI
PWR_EN
FB1
BAT
EP PGND1
LX1
FB2
BAT
SDA
SYSOUT
SCL
SYSOUT
PWR_ID
PWR_IN
PWR_IN
USBSEL
34 33 32
PWR_HOLD
PWR_ON
EXT_ON
17 18 19 20
GND
S2
S1
24
23
22
INBUCK
LX2
PGND2
7
8
9
LDO3
LDO1
INLDO
Absolute Maximum Ratings1
Symbol Pin Name Value Units
PWR_IN, PWR_ID, BAT, SYSOUT, SDA, SCL, RESET, STAT, USBSEL, ISETA, TS, CT, LBI,
LBO, INT, PWR_EN, PWR_HOLD, PWR_ON, PBSTAS, EXT_ON, S1, S2 Voltage to GND -0.3 to 6.5 V
INBUCK, INLDO Voltage to GND -0.3 to
VSYSOUT + 0.3 V
LX1, LX2, FB1, FB2 Voltage to PGND1, PGND2 -0.3 to
VINBUCK + 0.3 V
LDO1, LDO2, LDO3, LDO4, LDO5 Voltage to GND -0.3 to
VINLDO + 0.3 V
PGND1, PGND2 to GND -0.3 to +0.3 V
TJOperating Junction Temperature Range -40 to 150
°C
TAAmbient Temperature Range -40 to 85
TSStorage Temperature Range -65 to 150
TLEAD Maximum Junction Soldering Temperature (at leads, 10 sec.) 300
Thermal Information2, 3, 4
Symbol Description Value Units
θJA Thermal Resistance 25 °C/W
PDMaximum Power Dissipation 4 W
1. Stresses above those listed in Absolute Maximum Ratings may cause permanent damage to the device. Functional operation at conditions other than the operating conditions
specified is not implied. Only one Absolute Maximum Rating should be applied at any one time.
2. Thermal Resistance will be measured with the AAT3608 device on the 4-layer FR4 evaluation board in a thermal oven. The amount of power dissipation which will cause the
thermal shutdown to activate will depend on the ambient temperature and the PC board layout ability to dissipate the heat.
3. Measured on the AAT3608 demo board.
4. Derate the maximum power dissipation by 40mW/°C above 25°C ambient temperature.
AAT3608
DATA SHEET
Compact Seven-Channel Regulator
with Li+/Polymer Linear Battery Charger and I2C Interface
5
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
202214A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • July 26, 2012
1. Specification over the -40°C to +85°C operating temperature range is assured by design, characterization and correlation with statistical process controls.
Electrical Characteristics1
VPWR_IN = 5V, VPWR_ID = 5V, VBAT = 3.6V, -40°C ≤ TA ≤ +85°C, unless noted otherwise. Typical values are TA = 25°C.
Symbol Description Conditions Min Typ Max Units
Power Supply
VIN VINBUCK, VINLDO Input Operating Voltage 2.7 5.5 V
PWR_IN UVLO Threshold Rising (100mV hysteresis) 4.5 V
IOPS Sleep Mode Battery Operating Current VPWR_IN = 0V, Only LDO1, LDO3, and
Buck1 are on 200 µA
IOPDS Deep-Sleep Mode Battery Operating Current VPWR_IN = 0V, Only Buck1 is on 100 µA
ISHDN Battery Shutdown Current VPWR_IN = 0V and system is shut down 10 µA
Charger Voltage Regulation
VBAT_REG Output Charge Voltage Regulation 0°C ≤ TA ≤ +70°C 4.158 4.2 4.242 V
VMIN Preconditioning Voltage Threshold 2.6 2.8 3.0 V
VRCH Battery Recharge Voltage Threshold 4.00 V
Charger Current Regulation
ICH_CC Constant-Current Mode ADP Charge Current RISETA = 1.24kΩ (for 0.8A) (Can be set
to up to 1.2A) 800 mA
USB Charge Current USBSEL = H, PWR_ID = L 500 mA
USB Charge Current USBSEL = L, PWR_ID = L 100 mA
KISET Charge Current Set Factor: ICH_CC/IISET Constant Current Mode 800 mA/mA
ICH_PRE Preconditioning Charge Current RISETA = 1.24kΩ 12 % ICH_CC
ICH_TERM Charge Termination Threshold Current 5 % ICH_CC
Charging Device
RDS(ON),CHG On-Resistance of Charging Transistor SYSOUT to BAT Switch 0.6 0.9 Ω
Logic Control / Protection
VPWR_HOLD,
VPWR_ON,
VUSBSEL
Input High Threshold 1.4 V
Input Low Threshold 0.3 V
VINT
, VSTAT Output Low Voltage Pin Sinks 4mA 0.4 V
VOVP Over-Voltage Protection Threshold 4.3 V
IOCP Over Current Protection Threshold 105 % ICH_CC
TCConstant Current Mode Time Out
CCT = 100nF
3 Hours
TKTrickle Charge Time Out TC/8 Hours
TVConstant Voltage Mode Time Out 3 Hours
ITS Current Source from TS Pin 69 75 79 µA
TS1TS Hot Temperature Fault Falling Threshold 318 331 346 mV
Hysteresis 25 mV
TS2TS Cold Temperature Fault Rising Threshold 2.30 2.39 2.48 V
Hysteresis 25 mV
TLOOP_IN Thermal Loop Entering Threshold 115 °C
TLOOP_OUT Thermal Loop Exiting Threshold 85 °C
TREG Thermal Loop Regulation 100 °C
Load Switches / SYSOUT LDO
RDS(ON),
BAT-SYSOUT
On-Resistance of BAT-SYSOUT Load Switch 100 150 mΩ
RDS(ON),
PWR_IN-SYSOUT
On-Resistance of PWR_IN-SYSOUT Load
Switch 0.2 0.3 Ω
PWR_IN-SYSOUT Current Limit 2 A
PWR_IN-SYSOUT Current Limit USBSEL = High, PWR_ID = L 400 450 500 mA
USBSEL = Low, PWR_ID = L 100 mA
BAT-SYSOUT Current Limit 2 A
AAT3608
DATA SHEET
Compact Seven-Channel Regulator
with Li+/Polymer Linear Battery Charger and I2C Interface
6Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
202214A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • July 26, 2012
Electrical Characteristics (continued)1
VPWR_IN = 5V, VPWR_ID = 5V, VBAT = 3.6V, -40°C ≤ TA ≤ +85°C, unless noted otherwise. Typical values are TA = 25°C.
Symbol Description Conditions Min Typ Max Units
Step-Down Buck Regulator (Buck1)
VINBUCK Input Voltage Range 2.7 5.5 V
VOUT Output Voltage Programmable Range Using External Feedback Resistors, No Load 0.6 VINBUCK V
VREG Output Voltage Accuracy IOUT = 10mA 0.582 0.600 0.618 V
ILIM P-Channel Current Limit 2600 mA
RDS(ON)H High-Side Switch On-Resistance 450 mΩ
RDS(ON)L Low-Side Switch On-Resistance 400 mΩ
ΔVOUT /
(VOUT ΔVIN)Line Regulation 0.2 %/V
FOSC Oscillator Frequency 1.5 MHz
Step-Down Buck Regulator (Buck2)
VINBUCK Input Voltage Range 2.7 5.5 V
VFB
Feedback Voltage Programmable
Range Using I2C, with Default FB = 0.6V 0.5 0.7 V
VREG Output Voltage Accuracy IOUT = 10mA -3 +3 %
ILIM P-Channel Current Limit 2600 mA
RDS(ON)H High-Side Switch On-Resistance 450 mΩ
RDS(ON)L Low-Side Switch On-Resistance 400 mΩ
ΔVOUT /
(VOUT ΔVIN)Line Regulation 0.2 %/V
FOSC Oscillator Frequency 1.5 MHz
Low-Dropout Regulator (LDO1)
VINLDO Input Voltage Range 2.7 5.5 V
VLDO LDO Output Voltage
ILDO = 1mA to 300mA, S1 = 0, S2 = 0 2.91 3.00 3.09 V
ILDO = 1mA to 300mA, S1 = 0, S2 = 1 3.20 3.30 3.40 V
ILDO = 1mA to 300mA, S1 = 1, S2 = 0 2.71 2.80 2.89 V
IQLDO Quiescent Current VINLDO = 5V, added quiescent current when
LDO is enabled 50 90 µA
Line Regulation ILDO = 10mA 0.09 %/V
Dropout Voltage ILDO = 300mA 100 170 mV
ILDO LDO Maximum Load Current 500 mA
ILDO(LIM) LDO Current Limit 800 mA
Low-Dropout Regulator (LDO2)
VINLDO Input Voltage Range 2.7 5.5 V
VLDO LDO Output Voltage ILDO = 1mA to 80mA 1.164 1.2 1.236 V
IQLDO Quiescent Current VINLDO = 5V, added quiescent current when
LDO is enabled 35 80 µA
Line Regulation ILDO = 10mA 0.09 %/V
ILDO LDO Maximum Load Current 200 mA
ILDO(LIM) LDO Current Limit 800 mA
Low-Dropout Regulator (LDO3)
VINLDO Input Voltage Range 2.7 5.5 V
Output Voltage Range Using I2C. Default=1.2V 0.8 1.4 V
VLDO LDO Output Voltage ILDO = 1mA to 80mA -3 +3 %
IQLDO Quiescent Current VINLDO = 5V, added quiescent current when
LDO is enabled 35 80 µA
Line Regulation ILDO = 10mA 0.09 %/V
ILDO LDO Maximum Load Current 200 mA
ILDO(LIM) LDO Current Limit 800 mA
1. Specification over the -40°C to +85°C operating temperature range is assured by design, characterization and correlation with statistical process controls.
AAT3608
DATA SHEET
Compact Seven-Channel Regulator
with Li+/Polymer Linear Battery Charger and I2C Interface
7
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
202214A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • July 26, 2012
1. Specification over the -40°C to +85°C operating temperature range is assured by design, characterization and correlation with statistical process controls.
Electrical Characteristics (continued)1
VPWR_IN = 5V, VPWR_ID = 5V, VBAT = 3.6V, -40°C ≤ TA ≤ +85°C, unless noted otherwise. Typical values are TA = 25°C.
Symbol Description Conditions Min Typ Max Units
Low-Dropout Regulator (LDO4)
VINLDO Input Voltage Range 2.7 5.5 V
VLDO LDO Output Voltage ILDO = 1mA to 50mA 2.425 2.5 2.575 V
IQLDO Quiescent Current VINLDO = 5V, added quiescent current
when LDO is enabled 50 80 µA
Line Regulation ILDO = 10mA 0.09 %/V
ILDO LDO Maximum Load Current 200 mA
ILDO(LIM) LDO Current Limit 800 mA
Low-Dropout Regulator (LDO5)
VINLDO Input Voltage Range 2.7 5.5 V
VLDO LDO Output Voltage ILDO = 1mA to 50mA 3.2 3.3 3.4 V
IQLDO Quiescent Current VINLDO = 5V, added quiescent current
when LDO is enabled 50 80 µA
Line Regulation ILDO = 10mA 0.09 %/V
ILDO LDO Maximum Load Current 200 mA
ILDO(LIM) LDO Current Limit 800 mA
Reset and Low-Battery Comparator
Buck2 Power OK Threshold Rising threshold 91 %
Hysteresis 3 %
Reset Time From Power OK of BUCK2 output to
RESET pin rising edge 200 ms
Low-Battery Threshold Voltage Falling Edge 0.96 1.0 1.04 V
Hysteresis 50 mV
Thermal
TSD Over-Temperature Shutdown Threshold Rising 140 °C
THYS Over-Temperature Shutdown Hysteresis 15 °C
SCL, SDA (I2C Interface)
FSCL Clock Frequency 0 400 kHz
TLOW Clock Low Period 1.3 µs
THIGH Clock High Period 0.6 µs
THD_STA Hold Time for START Condition 0.6 µs
TSU_STA Set-up Time for Repeated START Condition 0.6 µs
TSU_DAT Data Setup Time 100 ns
THD_DAT Data Hold Low Time 0.9 µs
TSU_STO Setup Time for STOP Condition 0.6 µs
TBUF
Bus Free Time Between STOP and START
Condition 1.3 µs
VIL Input Threshold Low 2.7V ≤ VIN ≤ 5.5V 0.3 V
VIH Input Threshold High 2.7V ≤ VIN ≤ 5.5V 1.4 V
IIInput Leakage Current -1.0 1.0 µA
VOL Output Logic Low (SDA) IPULLUP = 3mA 0.3 V
AAT3608
DATA SHEET
Compact Seven-Channel Regulator
with Li+/Polymer Linear Battery Charger and I2C Interface
8Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
202214A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • July 26, 2012
Typical Characteristics−Charger
Power-In to SYSOUT Switch Current Limit
I
(PWRIN-SYSOUT)
(A)
V(PWRIN-SYSOUT) (V)
0.30.600.9 1.21.5 1.82.1 2.42.7 3.03.3 3.63.9 4.2
0.0
0.5
1.0
1.5
2.0
2.5
0.5A
2.0A
Power-In to SYSOUT Switch Current Limit
(100mA)
I
(PWRIN-SYSOUT)
(mA)
V(PWRIN-SYSOUT) (V)
0.30.600.9 1.21.5 1.82.1 2.42.7 3.03.3 3.63.9 4.2
0
20
40
60
80
100
120
140
160
180
I
BAT
vs. Temperature
(100mA)
Temperature (°C)
I
BAT
(mA)
-2020-6
06
0 100040-4
08
0
98.4
98.6
98.8
99.0
99.2
99.4
99.6
99.8
100.0
100.2
I
BAT
vs. Temperature
(500mA)
Temperature (°C)
I
BAT
(mA)
-2020-6
06
0 100040-4
08
0
493
494
495
496
497
498
499
500
501
Ideal Diode Load Switch between V
BAT
and V
SYSOUT
I
(BAT-SYSOUT)
(mA)
V(BAT-SYSOUT) (V)
0.501.0 1.52.0 2.53.0 3.54.0
0.0
0.5
1.0
1.5
2.0
2.5
3.0
Constant Charging Current vs. R
SET
RSET (kΩ)
Constant Charging Current (mA)
1100.1 100 1000
1
10
100
1000
10000
Constant Current
Trickle Charge
AAT3608
DATA SHEET
Compact Seven-Channel Regulator
with Li+/Polymer Linear Battery Charger and I2C Interface
9
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
202214A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • July 26, 2012
Typical Characteristics−Charger
Adapter Mode Supply Current vs. R
SET
Resistor
RSET (kΩ)
I
Q
(mA)
1100.1 100 1000
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
4.5
5.0
Constant Current
Preconditioning
AAT3608
DATA SHEET
Compact Seven-Channel Regulator
with Li+/Polymer Linear Battery Charger and I2C Interface
10 Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
202214A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • July 26, 2012
Typical Characteristics−Buck1
Efficiency vs. Load
(VB1 = 2.5V; L1 = 2.2µH)
Output Current (mA)
Efficiency (%)
1100.1 100 1000
0
10
20
30
40
50
60
70
80
90
100
VBAT = 3.3V
VBAT = 3.6V
VBAT = 3.9V
VBAT = 4.2V
Load Regulation
(VB1 = 2.5V; L1 = 2.2µH)
Output Current (mA)
Output Voltage Error (%)
1100.1 100 1000
-2.5
-2.0
-1.5
-1.0
-0.5
0.0
0.5
1.0
1.5
2.0
2.5
VBAT = 3.3V
VBAT = 3.6V
VBAT = 3.9V
VBAT = 4.2V
No Load Total Input Current vs.
V
BAT
Voltage
(VEN = VBAT; Closed Loop)
Input Current (mA)
VBAT Voltage (V)
3.63.7 3.83.9 4.04.1 4.2
0.30
0.35
0.40
0.45
0.50
85°C
25°C
-40°C
Output Ripple
(VBAT = 3.6V; VB1 = 2.5V; IOUTB1 = 1mA)
Time (100µs/div)
Output Voltage (middle) (V)
LX Voltage (top) (V)
Inductor Current (bottom) (A)
2.45
2.50
2.55
0.0
0.2
0
3.6
Output Ripple
(VBAT = 3.6V; VB1 = 2.5V; IOUTB1 = 800mA)
Time (500ns/div)
Output Voltage (middle) (V)
LX Voltage (top) (V)
Inductor Current (bottom) (A)
2.48
2.50
2.52
0.6
0.8
1.0
3.6
0
System Line Transient Response
(
VIN = 3.5V to 5V; VBAT = 3.6V; VOUTB1 = 2.5V; IOUTB1 = 800mA; falling)
Time (200µs/div)
Sysout Voltage (top) (V)
VBAT Voltage (middle) (V)
Output Voltage
(bottom) (V)
2
3
4
5
6
2.1
2.3
2.5
2.7
AAT3608
DATA SHEET
Compact Seven-Channel Regulator
with Li+/Polymer Linear Battery Charger and I2C Interface
11
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
202214A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • July 26, 2012
Typical Characteristics−Buck1 (continued)
System Line Transient Response
(VIN = 3.5V to 5V; VBAT = 3.6V; VOUTB1 = 2.5V; IOUTB1 = 800mA; rising)
Time (200µs/div)
Sysout Voltage (top) (V)
VBAT Voltage (middle) (V)
Output Voltage
(bottom) (V)
2
3
4
5
6
2.1
2.3
2.5
2.7
System Load Transient Response
(IOUTB1 = 80mA to 800mA; VBAT = 3.6V; COUTB1 = 4.7µF; CFF1 = 0pF)
Time (100µs/div)
Output Voltage
(bottom) (V)
Output Current
(top) (A)
2.1
2.3
2.5
2.7
0.0
0.5
1.0
1.5
80mA
800mA
Line Regulation
(VOUT1 = 2.5V; L1 = 2.2µH)
VBAT Voltage (V)
Output Voltage Error (%)
3.73.9 4.13.33.5 4.
34
.5
-0.3
-0.2
-0.1
0.0
0.1
0.2
0.3
IOUT = 50mA
IOUT = 100mA
IOUT = 400mA
IOUT = 800mA
Output Voltage Error vs. Temperature
(VBAT = 3.6V; VOUT1 = 2.5V)
Temperature (°C)
Output Voltage Error (%)
-250-50255075 100
-1.5
-1.0
-0.5
0.0
0.5
1.0
1.5
IOUT1 = 10mA
IOUT1 = 100mA
IOUT1 = 400mA
IOUT1 = 800mA
Switching Frequency vs. Temperature
(VIN = 3.6V; VOUT1 = 2.5V; IOUT1 = 800mA)
Temperature (°C)
Switching Frequency (MHz)
-200-4020406080 100
1.48
1.49
1.50
1.51
1.52
Switching Frequency vs. V
BAT
Voltage
(VOUT1 = 2.5V; IOUT1 = 800mA)
Frequency Variation (%)
VBAT Voltage (V)
2.73.1 3.53.9 4.34.7 5.
15
.5
-0.20
-0.15
-0.10
-0.05
0.00
0.05
0.10
0.15
0.20
AAT3608
DATA SHEET
Compact Seven-Channel Regulator
with Li+/Polymer Linear Battery Charger and I2C Interface
12 Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
202214A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • July 26, 2012
Typical Characteristics−Buck1 (continued)
Soft Start
(VBAT = 3.6V; VOUT1 = 2.5V; IOUT1 = 800mA; CFF = 100pF)
Time (100µs/div)
EnableVoltage (top) (V)
Output Voltage (middle) (V)
Output Current (bottom) (A)
0
1
2
3
4
0.0
0.5
1.0
AAT3608
DATA SHEET
Compact Seven-Channel Regulator
with Li+/Polymer Linear Battery Charger and I2C Interface
13
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
202214A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • July 26, 2012
Typical Characteristics−Buck2
Efficiency vs. Load
(VB2 = 1.2V; L2 = 2.2µH)
Output Current (mA)
Efficiency (%)
1100.1 100 1000
0
10
20
30
40
50
60
70
80
90
100
VBAT = 3.3V
VBAT = 3.6V
VBAT = 3.9V
VBAT = 4.2V
DC Regulation vs. Load
(VB2 = 1.2V; L2 = 2.2µH)
Output Current (mA)
Output Error (%)
1100.1 100 1000
-2.5
-2.0
-1.5
-1.0
-0.5
0.0
0.5
1.0
1.5
2.0
2.5
VBAT = 3.3V
VBAT = 3.6V
VBAT = 3.9V
VBAT = 4.2V
Output Ripple
(VBAT = 3.6V; VOUTB2 = 1.2V; IOUTB2 = 1mA)
Time (50µs/div)
Output Voltage (middle) (V)
LX Voltage (top) (V)
Inductor Current (bottom) (A)
1.18
1.20
1.22
0.0
0.2
0.4
3.6
0
Output Ripple
(VBAT = 3.6V; VOUTB2 = 1.2V; IOUTB2 = 800mA)
Time (500ns/div)
Output Voltage (middle) (V)
LX Voltage (top) (V)
Inductor Current (bottom) (A)
1.18
1.20
1.22
0.6
0.8
1.0
3.6
0
System Line Transient Response
(
VIN = 3.5V to 5V; VBAT = 3.6V; VOUTB2 = 1.2V; IOUTB2 = 800mA; falling)
Time (200µs/div)
Sysout Voltage (top) (V)
VBAT Voltage (middle) (V)
Output Voltage
(bottom) (V)
2
3
4
5
6
1.0
1.1
1.2
1.3
System Line Transient Response
(VIN = 3.5V to 5V; VBAT = 3.6V; VOUTB2 = 1.2V; IOUTB2 = 800mA; rising)
Time (200µs/div)
Sysout Voltage (top) (V)
VBAT Voltage (middle) (V)
Output Voltage
(bottom) (V)
2
3
4
5
6
1.0
1.1
1.2
1.3
AAT3608
DATA SHEET
Compact Seven-Channel Regulator
with Li+/Polymer Linear Battery Charger and I2C Interface
14 Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
202214A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • July 26, 2012
Typical Characteristics−Buck2 (continued)
System Load Transient Response
(IOUTB2 = 80mA to 800mA; VBAT = 3.6V; COUTB2 = 4.7µF; CFF1 = 0pF)
Time (100µs/div)
Output Voltage
(bottom) (V)
Output Current
(top) (A)
1.0
1.1
1.2
1.3
0.0
0.5
1.0
1.5
80mA
800mA
Line Regulation
(VOUT2 = 2.5V; L2 = 2.2µH)
VBAT Voltage (V)
Output Voltage Error (%)
3.63.8 4.03.23.4 4.
24
.4
-0.3
-0.2
-0.1
0.0
0.1
0.2
0.3
IOUT2 = 10mA
IOUT2 = 50mA
IOUT2 = 100mA
IOUT2 = 400mA
IOUT2 = 800mA
Output Voltage Error vs. Temperature
(VBAT = 3.6V; VOUT2 = 1.2V)
Temperature (°C)
Output Voltage Error (%)
-250-50255075 100
-1.5
-1.0
-0.5
0.0
0.5
1.0
1.5
IOUT2 = 10mA
IOUT2 = 100mA
IOUT2 = 400mA
IOUT2 = 800mA
Soft Start
(VBAT = 3.6V; VOUT1 = 1.2V; IOUT2 = 800mA; CFF = 100pF)
Time (100µs/div)
EnableVoltage (top) (V)
Output Voltage (middle) (V)
Output Current (bottom) (A)
0
1
2
3
4
0.0
0.5
1.0
AAT3608
DATA SHEET
Compact Seven-Channel Regulator
with Li+/Polymer Linear Battery Charger and I2C Interface
15
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
202214A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • July 26, 2012
Typical Characteristics−LDO1
System Line Transient Response
(VIN = 3.5V to 5V; VBAT = 3.6V; VLDO1 = 3V; ILDO1 = 300mA; rising)
Time (200µs/div)
Sysout Voltage (top) (V)
VBAT Voltage (middle) (V)
LDO1 Output Voltage
(bottom) (V)
3
4
5
6
2.8
2.9
3.0
3.1
3.2
System Line Transient Response
(
VIN = 3.5V to 5V; VBAT = 3.6V; VLDO1 = 3V; ILDO1 = 300mA; falling)
Time (200µs/div)
Sysout Voltage (top) (V)
VBAT Voltage (middle) (V)
LDO1 Output Voltage
(bottom) (V)
3
4
5
6
2.8
2.9
3.0
3.1
Output Voltage Error vs. Temperature
(VBAT = 3.6V; VLDO1 = 3.0V)
Temperature (°C)
LDO1 Output Voltage Error (%)
-250-50255075 100
-1.5
-1.0
-0.5
0.0
0.5
1.0
1.5
IOUT = 0.1mA
IOUT = 10mA
IOUT = 100mA
IOUT = 150mA
IOUT = 300mA
Line Regulation
(VLDO1 = 3.0V)
VBAT Voltage (V)
Output Voltage Error (%)
3.84.0 4.23.43.6 4.4
-0.3
-0.2
-0.1
0.0
0.1
0.2
0.3
IOUT = 0.1mA
IOUT = 1mA
IOUT = 10mA
IOUT = 100mA
IOUT = 150mA
IOUT = 300mA
Load Transient Response
(ILDO1 = 30mA to 300mA; VBAT = 3.6V; VLDO1 = 3V; CLDO1 = 4.7µF)
Time (200µs/div)
LDO1 Output Voltage
(bottom) (V)
LDO1 Output Current
(top) (A)
2.90
2.95
3.00
3.05
0.0
0.1
0.2
0.3
0.4
Load Regulation
(VBAT = 3.6V; VLDO1 = 3.0V)
Output Current (mA)
LDO1 Output Voltage Error (%)
1100.1 100 1000
-1.5
-1.0
-0.5
0.0
0.5
1.0
1.5
AAT3608
DATA SHEET
Compact Seven-Channel Regulator
with Li+/Polymer Linear Battery Charger and I2C Interface
16 Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
202214A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • July 26, 2012
Typical Characteristics−LDO1 (continued)
Soft Start
(VBAT = 3.6V; VLDO1 = 3.0V; ILDO1 = 150mA)
Time (100µs/div)
Enable Voltage (top) (V)
LDO1 Output Voltage (middle) (V)
LDO1 Output Current
(bottom) (mA)
0
1
2
3
4
0
100
200
AAT3608
DATA SHEET
Compact Seven-Channel Regulator
with Li+/Polymer Linear Battery Charger and I2C Interface
17
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
202214A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • July 26, 2012
Typical Characteristics−LDO2
System Line Transient Response
(
VIN = 3.5V to 5V; VBAT = 3.6V; VLDO2 = 1.2V; ILDO2 = 80mA; rising)
Time (200µs/div)
Sysout Voltage (top) (V)
VBAT Voltage (middle) (V)
LDO2 Output Voltage
(bottom) (V)
0
1
2
3
4
5
6
1.0
1.1
1.2
1.3
System Line Transient Response
(VIN = 3.5V to 5V; VBAT = 3.6V; VLDO2 = 1.2V; ILDO2 = 80mA; falling)
Time (200µs/div)
Sysout Voltage (top) (V)
VBAT Voltage (middle) (V)
LDO2 Output Voltage
(bottom) (V)
3
4
5
6
1.0
1.1
1.2
1.3
Load Transient Response
(ILDO2 = 8mA to 80mA; VBAT = 3.6V; VLDO2 = 1.2V; CLDO2 = 4.7µF)
Time (200µs/div)
LDO2 Output Voltage
(bottom) (V)
LDO2 Output Current
(top) (mA)
1.16
1.18
1.20
1.22
0
50
100
150
Output Voltage Error vs. Temperature
(VBAT = 3.6V; VLDO2 = 1.2V)
Temperature (°C)
LDO2 Output Voltage Error (%)
-250-50255075 100
-1.5
-1.0
-0.5
0.0
0.5
1.0
1.5
IOUT = 0.1mA
IOUT = 1mA
IOUT = 10mA
IOUT = 100mA
Line Regulation
(VLDO2 = 1.2V)
VBAT Voltage (V)
LDO2 Output Accuracy (%)
3.84.0 4.23.23.4 3.
64
.4
-0.3
-0.2
-0.1
0.0
0.1
0.2
0.3
IOUT = 0.1mA
IOUT = 1mA
IOUT = 10mA
IOUT = 100mA
Load Regulation
(VBAT = 3.6V; VLDO2 = 1.2V)
Output Current (mA)
LDO2 Output Voltage Error (%)
1100.1 100
-1.5
-1.0
-0.5
0.0
0.5
1.0
1.5
AAT3608
DATA SHEET
Compact Seven-Channel Regulator
with Li+/Polymer Linear Battery Charger and I2C Interface
18 Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
202214A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • July 26, 2012
Typical Characteristics−LDO2 (continued)
Soft Start
(VBAT = 3.6V; VLDO2 = 1.2V; ILDO2 = 80mA)
Time (100µs/div)
Enable Voltage (top) (V)
LDO2 Output Voltage (middle) (V)
LDO2 Output Current
(bottom) (mA)
0
1
2
3
4
0
50
100
AAT3608
DATA SHEET
Compact Seven-Channel Regulator
with Li+/Polymer Linear Battery Charger and I2C Interface
19
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
202214A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • July 26, 2012
Typical Characteristics−LDO3
System Line Transient Response
(
VIN = 3.5V to 5V; VBAT = 3.6V; VLDO3 = 1.2V; ILDO3 = 80mA; rising)
Time (200µs/div)
Sysout Voltage (top) (V)
VBAT Voltage (middle) (V)
LDO3 Output Voltage
(bottom) (V)
3
4
5
6
1.0
1.1
1.2
1.3
1.4
System Line Transient Response
(VIN = 3.5V to 5V; VBAT = 3.6V; VLDO3 = 1.2V; ILDO3 = 80mA; falling)
Time (200µs/div)
Sysout Voltage (top) (V)
VBAT Voltage (middle) (V)
LDO3 Output Voltage
(bottom) (V)
3
4
5
6
1.0
1.1
1.2
1.3
Load Transient Response
(ILDO3 = 8mA to 80mA; VBAT = 3.6V; CLDO3 = 4.7µF)
Time (200µs/div)
LDO3 Output Voltage
(bottom) (V)
LDO3 Output Current
(top) (mA)
1.16
1.18
1.20
1.22
0
50
100
150
Line Regulation
(VLDO3 = 1.2V)
VBAT Voltage (V)
LDO3 Output Accuracy (%)
3.84.0 4.23.23.4 3.
64
.4
-0.3
-0.2
-0.1
0.0
0.1
0.2
0.3
IOUT = 0.1mA
IOUT = 1mA
IOUT = 10mA
IOUT = 100mA
Output Voltage Error vs. Temperature
(VBAT = 3.6V; VLDO3 = 1.2V)
Temperature (°C)
LDO3 Output Voltage Error (%)
-250-50255075 100
-1.5
-1.0
-0.5
0.0
0.5
1.0
1.5
IOUT = 0.1mA
IOUT = 1mA
IOUT = 10mA
IOUT = 100mA
Load Regulation
(VBAT = 3.6V; VLDO3 = 1.2V)
Output Current (mA)
LDO3 Output Voltage Error (%)
1100.1 100
-1.5
-1.0
-0.5
0.0
0.5
1.0
1.5
AAT3608
DATA SHEET
Compact Seven-Channel Regulator
with Li+/Polymer Linear Battery Charger and I2C Interface
20 Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
202214A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • July 26, 2012
Typical Characteristics−LDO3 (continued)
Soft Start
(VBAT = 3.6V; VLDO3 = 1.2V; ILDO3 = 80mA)
Time (100µs/div)
Enable Voltage (top) (V)
LDO3 Output Voltage (middle) (V)
LDO3 Output Current
(bottom) (mA)
0
1
2
3
4
0
50
100
AAT3608
DATA SHEET
Compact Seven-Channel Regulator
with Li+/Polymer Linear Battery Charger and I2C Interface
21
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
202214A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • July 26, 2012
Typical Characteristics−LDO4
System Line Transient Response
(
VIN = 3.5V to 5V; VBAT = 3.6V; VLDO4 = 2.5V; ILDO4 = 50mA; rising)
Time (200µs/div)
Sysout Voltage (top) (V)
VBAT Voltage (middle) (V)
LDO4 Output Voltage
(bottom) (V)
3
4
5
6
2.3
2.4
2.5
2.6
2.7
System Line Transient Response
(VIN = 3.5V to 5V; VBAT = 3.6V; VLDO4 = 2.5V; ILDO4 = 50mA; falling)
Time (200µs/div)
Sysout Voltage (top) (V)
VBAT Voltage (middle) (V)
LDO4 Output Voltage
(bottom) (V)
3
4
5
6
2.3
2.4
2.5
2.6
2.7
Load Transient Response
(ILDO4 = 5mA to 50mA; VBAT = 3.6V; VLDO4 = 2.5V; CLDO4 = 4.7µF)
Time (200µs/div)
LDO4 Output Voltage
(bottom) (V)
LDO4 Output Current
(top) (A)
2.46
2.48
2.50
2.52
0
50
100
150
Line Regulation
(VLDO4 = 2.5V)
VBAT Voltage (V)
Output Voltage Error (%)
3.84.0 4.23.23.4 3.
64
.4
-0.3
-0.2
-0.1
0.0
0.1
0.2
0.3
IOUT = 0.1mA
IOUT = 1mA
IOUT = 10mA
IOUT = 100mA
Output Voltage Error vs. Temperature
(VBAT = 3.6V; VLDO4 = 2.5V)
Temperature (°C)
LDO4 Output Voltage Error (%)
-250-50255075 100
-1.5
-1.0
-0.5
0.0
0.5
1.0
1.5
IOUT = 0.1mA
IOUT = 1mA
IOUT = 10mA
IOUT = 100mA
Load Regulation
(VBAT = 3.6V; VLDO4 = 2.5V)
Output Current (mA)
LDO4 Output Voltage Error (%)
1100.1 100
-1.5
-1.0
-0.5
0.0
0.5
1.0
1.5
AAT3608
DATA SHEET
Compact Seven-Channel Regulator
with Li+/Polymer Linear Battery Charger and I2C Interface
22 Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
202214A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • July 26, 2012
Typical Characteristics−LDO4 (continued)
Soft Start
(VBAT = 3.6V; VLDO4 = 2.5V; ILDO4 = 50mA)
Time (100µs/div)
Enable Voltage (top) (V)
LDO4 Output Voltage (middle) (V)
LDO4 Output Current
(bottom) (mA)
0
1
2
3
4
0
50
100
AAT3608
DATA SHEET
Compact Seven-Channel Regulator
with Li+/Polymer Linear Battery Charger and I2C Interface
23
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
202214A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • July 26, 2012
Typical Characteristics−LDO5
System Line Transient Response
(
VIN = 3.5V to 5V; VBAT = 3.6V; VLDO5 = 3.3V; ILDO5 = 50mA; rising)
Time (200µs/div)
Sysout Voltage (top) (V)
VBAT Voltage (middle) (V)
LDO5 Output Voltage
(bottom) (V)
3
4
5
6
3.1
3.2
3.3
3.4
3.5
System Line Transient Response
(VIN = 3.5V to 5V; VBAT = 3.6V; VLDO5 = 3.3V; ILDO5 = 50mA; falling)
Time (200µs/div)
Sysout Voltage (top) (V)
VBAT Voltage (middle) (V)
LDO5 Output Voltage
(bottom) (V)
3
4
5
6
3.1
3.2
3.3
3.4
3.5
Load Transient Response
(ILDO5 = 5mA to 50mA; VBAT = 3.9V; CLDO5 = 4.7µF)
Time (200µs/div)
LDO5 Output Voltage
(bottom) (V)
LDO5 Output Current
(top) (A)
3.26
3.28
3.30
3.32
3.34
0
50
100
150
Line Regulation
(VLDO5 = 3.3V)
VBAT Voltage (V)
LDO5 Output Accuracy (%)
3.84.0 4.23.
64
.4
-0.3
-0.2
-0.1
0.0
0.1
0.2
0.3
IOUT = 0.1mA
IOUT = 1mA
IOUT = 10mA
IOUT = 100mA
Output Voltage Error vs. Temperature
(VBAT = 3.6V; VLDO4 = 3.3V)
Temperature (°C)
LDO5 Output Voltage Error (%)
-250-50255075 100
-1.5
-1.0
-0.5
0.0
0.5
1.0
1.5
IOUT = 0.1mA
IOUT = 1mA
IOUT = 10mA
IOUT = 100mA
Load Regulation
(VBAT = 3.6V; VLDO5 = 3.3V)
Output Current (mA)
LDO5 Output Voltage Error (%)
1100.1 100
-1.5
-1.0
-0.5
0.0
0.5
1.0
1.5
AAT3608
DATA SHEET
Compact Seven-Channel Regulator
with Li+/Polymer Linear Battery Charger and I2C Interface
24 Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
202214A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • July 26, 2012
Typical Characteristics−LDO5 (continued)
Soft Start
(VBAT = 3.6V; VLDO5 = 3.3V; ILDO5 = 50mA)
Time (100µs/div)
Enable Voltage (top) (V)
LDO5 Output Voltage (middle) (V)
LDO5 Output Current
(bottom) (A)
0
1
2
3
4
0.00
0.05
0.10
AAT3608
DATA SHEET
Compact Seven-Channel Regulator
with Li+/Polymer Linear Battery Charger and I2C Interface
25
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
202214A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • July 26, 2012
Functional Description
The AAT3608 is a complete power management solution.
It seamlessly integrates a battery charger with two step-
down converters and five low-dropout regulators to pro-
vide power from either an external power source or a
single-cell Lithium Ion/Polymer battery. Internal load
switches allow the converters to operate from the best
available power source.
If only the battery is available, then the voltage convert-
ers are powered directly from the battery through a 100
mΩ load switch (BAT to SYSOUT). During this condition,
the charger is put into sleep mode and draws less than
1µA quiescent current. If the system is connected to a
wall adapter, then the voltage converters are powered
directly from the adapter through a 200mΩ load-switch
(PWR_IN to SYSOUT) and the battery is disconnected
from the voltage converter inputs. This allows the sys-
tem to operate regardless of the state of the battery. It
can even operate with no battery.
System Output (SYSOUT)
Intelligent control of the integrated load switches is
managed by the switch control circuitry. If the voltage
across PWR_IN and GND pin is above the UVLO typical
threshold voltage of 4.5, then the switch control will
automatically short the load switch connecting PWR_IN
to SYSOUT. Additionally, the charging switch will be
enabled and switch connecting BAT and SYSOUT will be
turned off. The location of the two switches and the bat-
tery charging switch allows the step-down converter and
LDO to always have the best available source of power.
Furthermore, AAT3806 control logic allows the voltage
converters to operate with no battery, or with a battery
voltage below the trickle charge threshold.
Functional Block Diagram
Li-Ion
Linear
Charger
Control
Buck1
Reset
Thermal
Shutdown
Enable
Control and
I2C Logic
LDO1 3.3V/3.0V/2.8V (S1 & S2 bits)
300mA max
LDO2
80mA max
LDO3
80mA max
LDO4
50mA max
INLDO
LX1
FB1
PGND1
1 Cell Li-Ion
SCL
SDA
PWR_HOLD
EXT_ON
PWR_ON
Buck1 OK
LX2
FB2
PGND2
RESET
2µ
GND
L1
L2
INBUCK
Buck2
INBUCK
LDO2
LDO3
LDO4
LDO1
LDO5
50mA max
LDO5
INT
CT
ISETA
+
-
+
BAT
LBO
LBI
Load
Switch
SYSOUT BAT
STAT
To INBUCK, INLDO
PWR_EN
TS
2µ
1.0V
BAT
PBSTAS
BUCK1
320ms Debounce
320ms Debounce
S1 S2
USBSEL
BUCK1
800mA max
BUCK2
FB2 is I2C adj.
from 0.5V to 0.7V
800mA max
SYSOUT
PWR_ID
PWR_IN
1
2
3
40
37
38,39
4
12
14
32
34
33
30
31
15
16
17 19 18
11
10
7
5
8
6,9
20
21
22
23
13
27
26
25
24
28,29
35,36
Charge
Switch
LBO
0. 6V to 5.5V
Output is I2C adj.
from 1.0V to 1.4V
1.2V (default )
3.3V/2.85V/2.5V/1.8V (I2C)
2.5V (default )
3.3V/3.0V/1.5V/1.2V (I2C)
3.3V (default )
0.6V (default )
1.2V (fixed)
AAT3608
DATA SHEET
Compact Seven-Channel Regulator
with Li+/Polymer Linear Battery Charger and I2C Interface
26 Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
202214A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • July 26, 2012
Battery Charging
Battery charging commences only after the AAT3608 bat-
tery charger checks several conditions in order to main-
tain a safe charging environment. When an adapter input
is connected to PWR_IN and is greater than 4.5V, the
ENCHG bit is set (default) and the PWR_HOLD signal is
high, the charger is enabled. The charger can be disabled
by clearing the ENCHG bit through the I2C interface.
Figure 1 illustrates the entire battery charging profile or
operation, which consists of three phases:
1. Preconditioning (Trickle) Charge
2. Constant Current Charge
3. Constant Voltage Charge
During battery charging, the battery charger initially
checks the condition of the battery and determines which
charging mode to apply. If the battery voltage is below
VMIN, then the battery charger initiates trickle charge
mode and charges the battery at 12% of the programmed
constant-current magnitude. For example, if the pro-
grammed current (ISETA) is 500mA, then the trickle charge
current will be 60mA. Trickle charge is a safety precau-
tion for a deeply discharged cell. It is intended to reduce
stress on the battery, but also reduces the power dissipa-
tion in the internal series pass MOSFET when the input-
output voltage differential is at its highest.
Trickle charge continues until the battery voltage reach-
es 2.8V. At this point the battery charger begins con-
stant-current charging. The current level for this mode is
programmed using a resistor from the ISETA pin to
ground, or can be selected through the USBSEL pin with
settings of 100mA or 500mA; refer to the logic settings
in Table 2. Constant-current charging continues until the
voltage reaches the charge voltage regulation point.
VBAT_REG is factory programmed to 4.2V (nominal).
Charging in constant-voltage mode will continue until the
charge current has reduced to the charge termination
current threshold. After the charge cycle is complete, the
battery charger turns off the series pass device and
automatically goes into a power saving sleep mode.
During this time, the series pass device will block current
in both directions to prevent the battery from discharg-
ing through the battery charger.
The battery charger will remain in sleep mode even if the
charger source is disconnected. It will come out of sleep
mode when either the battery terminal voltage drops
below the VRCH threshold, or the charging source is
removed and reconnected. In all cases, the battery char-
ger will monitor all parameters and resume charging in
the most appropriate mode.
Battery Temperature Fault Monitoring
The TS pin is available to monitor the battery tempera-
ture. Connect a 10k NTC resistor from the TS pin to
ground. The TS pin outputs a 75µA constant current into
the resistor and monitors the voltage to ensure that the
battery temperature does not fall outside the operating
limits depending on the temperature coefficient of the
resistor used. When the voltage goes above 2.39V or
goes below 0.331V, the charging will be suspended. A
Beta range of 3300 to 4000 will place the typical charg-
ing temperature between -4°C and 48°C.
Constant Current (CC)
Charge Phase
Preconditioning
Trickle Charge
Phase
Charge Complete Voltage
Constant Current Mode
Voltage Threshold (VMIN)
Regulated Current
Trickle Charge and
Termination Threshold
ICH_PRE
Battery Recharge
Voltage Threshold
Battery Discharge
Constant Voltage
Charge Phase
Constant Voltage
Charge Phase
(CC)
ICH_CC
Figure 1: Current vs. Voltage Profile During Charging Phases.
AAT3608
DATA SHEET
Compact Seven-Channel Regulator
with Li+/Polymer Linear Battery Charger and I2C Interface
27
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
202214A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • July 26, 2012
Battery Charging Flowchart
Power on Reset
Power Input
Voltage
VIN > VUVLO
Fault
Conditions
Monitoring
OV, OT,
TS < VTS1
TS > VTS2
Preconditioning
Trickle Charge
VBAT< VMIN
Constant Current
VBAT< VBAT_EOC
Constant
Voltage
IBAT> ITERM
No
No
Yes
No
Charge Completed
Charge Timer
Control
No
Recharge Test
VBAT < VRCH
Yes
No
Shut Down Yes
Enable
Yes
No
Device Thermal
Loop Monitor
TJ>115 C
Thermal Loop
Current
Reduction in ADP
Charging Mode
Thermal Loop
Current
Reduction in
C.C. Mode
No
Enable
Yes
Expired
No
Yes
Yes
Yes
AAT3608
DATA SHEET
Compact Seven-Channel Regulator
with Li+/Polymer Linear Battery Charger and I2C Interface
28 Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
202214A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • July 26, 2012
Buck Regulators
The AAT3608 step-down converters are peak current
mode PWM converters operating at 1.5MHz frequency.
The input voltage range is 2.7V to 5.5V. The converters
provide internal compensation. Power devices are sized
for 800mA output current while maintaining over 85%
efficiency at full load. Peak efficiency is above 90%.
Light load efficiency is maintained at greater than 80%
down to 85% of full load current. Soft start limits the
current surge seen at the input and eliminates output
voltage overshoot.
The input pin, INBUCK (Pin 24) must be connected to
the SYSOUT output pin. The Buck1 output voltage is
adjustable from 0.6V to 5.5V and is programmed
through an external resistor divider. Buck2 output
default value is set by external resistor feedback and
then the feedback voltage can be dynamically adjusted
via I2C in 12.5mV increments from 0.5V to 0.7V.
For overload conditions, the peak input current is limit-
ed. Also, thermal protection completely disables switch-
ing if internal dissipation becomes excessive, thus pro-
tecting the device from damage. The junction over-
temperature threshold is 140°C with 15°C of hysteresis.
Under-voltage lockout (UVLO) guarantees sufficient VIN
bias and proper operation of all internal circuits prior to
activation.
The current through the P-channel MOSFET (high side)
is sensed for current loop control, as well as short circuit
and overload protection. A fixed slope compensation
signal is added to the sensed current to maintain stabil-
ity for duty cycles greater than 50%. The peak current
mode loop appears as a voltage-programmed current
source in parallel with the output capacitor. The output
of the voltage error amplifier programs the current mode
loop for the necessary peak switch current to force a
constant output voltage for all load and line conditions.
Internal loop compensation terminates the transconduc-
tance voltage error amplifier output. The reference volt-
age is internally set to program the converter output
voltage greater than or equal to 0.6V.
For conditions where the input voltage drops to the out-
put voltage level, the converter duty cycle increases to
100%. As the converter approaches the 100% duty
cycle, the minimum off-time initially forces the high side
on-time to exceed the 1.5MHz clock cycle and reduces
the effective switching frequency. Once the input drops
below the level where the converter can regulate the
output, the high side P-channel MOSFET is enabled con-
tinuously for 100% duty cycle. At 100% duty cycle the
output voltage tracks the input voltage minus the I*R
drop of the high side P-channel MOSFET.
For overload conditions, the peak input current is limit-
ed. The bucks use a cycle-by-cycle current limit to pro-
tect itself and the load from an external fault condition.
Thermal protection completely disables switching when
internal dissipation becomes excessive. The junction
over-temperature threshold is 140°C with 15°C of hys-
teresis. Once an over-temperature or over-current fault
conditions is removed, the output voltage automatically
recovers.
Low-Dropout Regulators
The advanced circuit design of the linear regulators has
been specifically optimized for very fast start-up and
shutdown timing. These proprietary LDOs are tailored
for superior transient response characteristics. These
traits are particularly important for applications which
require fast power supply timing.
The high-speed turn-on capability is enabled through the
implementation of a fast start control circuit, which
accelerates the power up behavior of fundamental con-
trol and feedback circuits within the LDO regulator. For
fast turn-off time response is achieved by an active out-
put pull down circuit, which is enabled when the LDO
regulator is placed in the shutdown mode. This active
fast shutdown circuit has no adverse effect on normal
device operation.
There are two LDO input pins, INLDO (pins 6 and 9),
which must be connected to the SYSOUT output pin.The
LDO1 output voltage is selectable using pins S1 and S2
as shown in Table 1. LDO2 is fixed at 1.2V, LDO4 is fixed
at 2.5V and LDO5 is fixed at 3.3V. LDO3 output default
value is 1.2V and then can be dynamically adjusted via
I2C in 25mV increments from 1.0V to 1.4V.
S1 S2 LDO1
0 0 3.0V
0 1 3.3V
1 0 2.8V
1 1 Reserved
Table 1: LDO1 Output Voltages.
AAT3608
DATA SHEET
Compact Seven-Channel Regulator
with Li+/Polymer Linear Battery Charger and I2C Interface
29
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
202214A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • July 26, 2012
Controlling the System Outputs
The AAT3608 has a specific startup and shutdown condi-
tions depending on its mode of operation.
Shutdown Mode
“Shutdown Mode” is defined as the mode where the
entire PMU (Power Management Unit) is shut down. This
is a state that normally happens after all power has been
disconnected from PWR_IN and BAT. Typically, after
power has been applied and the part has been turned
on, it will normally never need to be turned off. For GPS
applications, the amount of time required for the SOC to
start up from shutdown is prohibitively long, so the only
time that it will go into Shutdown Mode (from any other
mode) is when PWR_IN is disconnected and the BAT is
below the Low-Battery comparator threshold.
Normal Mode
“Normal Mode” is defined as the mode where all regula-
tors are active. Once the part is in Normal Mode, it will
typically go into Sleep or Deep-Sleep Mode when trying
to save current.
SOC Sleep Mode
“Sleep Mode” is an SOC-defined mode which simply
means that all regulators are shut down except SYSOUT,
Buck1, LDO1, and LDO3. To get into this mode from
Normal, the SOC will pull the PWR_EN pin low to turn off
LDO2, LDO4, and LDO5. Buck2 can also be controlled by
PWR_EN only if the SOC masks PWR_EN through I2C.
From a PMU point of view, it is no different from Normal
Mode except for the regulators that have been switched
off by pulling PWR_EN low.
Deep Sleep Mode
“Deep Sleep Mode” is both an SOC and PMU-defined
mode where all regulators have been turned off except
for SYSOUT and Buck1. Data is backed up by the SOC
and Buck1 stays alive to maintain the memory. LDO4
and LDO5 would be turned off separately by I2C, but the
DS_RDY and PWR_DS I2C bits are used to get into and
out of Deep Sleep Mode. See the flowchart diagrams for
more detail.
PWR_ID Pin
The PWR_ID pin is an input logic pin which determines
the current limits and fast charge currents that will be
used by PMU. PWR_ID settings are listed in Table 2.
Timing Sequences
The AAT3608 has a specific startup sequence when the
device is activated. See the timing diagrams in Figures 2
through 7.
RESET
The RESET pin is an open drain active low output signal
for system reset. Connect a pull-up resistor from the
RESET pin to SYSOUT pin with a recommended resis-
tance value of 100kΩ. After Buck2 and LDO2 reach their
target nominal output voltage, a delay of 200ms exists
before RESET goes high; refer to the timing diagram in
Figure 2.
PWR_ID Pin USBSEL Pin
PWR_IN – SYSOUT
Switch Current Limit Battery Fast Charge Current
L L 100mA (typical) 100mA (typical)
L H 500mA (typical) 500mA (typical)
H X Up to 1.2A (typical) Set by the resistor at the ISETA pin.
Table 2: PWR_ID Settings.
AAT3608
DATA SHEET
Compact Seven-Channel Regulator
with Li+/Polymer Linear Battery Charger and I2C Interface
30 Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
202214A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • July 26, 2012
LDO4
LDO5
LDO1
BUCK1
RESET pin
PWR_EN pin
LDO2
BUCK2
SYSOUT SYSOUT
1ms200ms
PWR_ EN
disabled
Normal Mode Sleep ModePower on sequence
Power off sequence
LDO3
Normal Mode
PWR_ EN
asserted
Wake up sequence
Triggered by
PWR_EN
Figure 2: Normal Sleep Mode Sequence.
SOC
AAT3608
PMU
GPIO
2u
320ms
Debounce
PBSTAS
PWR_ON
The PMU
regulators
only react to
the PWR_ EN
pin.
X_PWR_EN
BUCK2
LDO2
LDO4 &
LDO5
PWR_EN
The user pushes and releases the button to go into Sleep Mode.
The user pushes and releases the pushbutton again to go back to Normal Mode.
PWR_HOLD
PWR_HOLD
Figure 3: Normal Sleep Mode Block Diagram.
AAT3608
DATA SHEET
Compact Seven-Channel Regulator
with Li+/Polymer Linear Battery Charger and I2C Interface
31
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
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LDO5 (VDDA3V3_USB),
LDO4 (VDDA2 V5_USB, VDDIO_ TSC,
VDDA_TSC, VREF_ADC)
T2
BUCK1
X_RESET_B
SYSOUT
T1
Normal Mode Deep-sleep ModePower on sequence
Power off
sequence
Notes 1: T1 at least 650µS for internal LVR setup time; T2 is about 2ms to wait until PLL is stable; other time interval is dependent on power stability.
Notes 2: After wake-up sequence from Deep-sleep Mode, the power on sequence to Normal Mode is similar to when powering on initially.
LDO3
BUCK2
Normal Mode
Wake up
sequence
LDO1
LDO2
T2
LDO4
LDO5
Figure 4: Normal Deep-Sleep Mode Sequence.
When Deep-Sleep is
triggered (by the pushbutton)
-SOC will back up all data
-SOC will turn off LDO4 and
LDO5 using I2C
-SOC will set DS_RDY bit
using I2C
SOC sets PWR_DS bit through I2C.
PMU sees that PWR_DS has been set
so then PMU disables regulators Buck2,
LDO1, LDO2, LDO3, LDO4,and LDO5
simultaneously.
Each Buck output is at High-Z, but all
LDOs will be pulled to GND.
Normal Mode
DS_RDY = 0
PWR_DS = 0
Buck1 on
Buck2 on
LDO1 on
LDO2 on
LDO3 on
LDO4 on
LDO5 on
Charger on
LB comp on
Deep-Sleep
Mode
DS_RDY = 1
PWR_DS = 1
Buck2 off
LDO1 off
LDO2 off
LDO3 off
LDO4 off
LDO5 off
Charger on
LB comp on
SYSOUT on
SYSOUT on
Buck1 on
Deep-Sleep
Ready
DS_RDY = 1
PWR_DS = 0
Buck1 on
Buck2 on
LDO1 on
LDO2 on
LDO3 on
Charger on
LB comp on
SYSOUT on
LDO4 off
LDO5 off
DS_RDY = 1
PWR_DS = 0
Buck1 on
Buck2 on
LDO1 on
LDO2 off
LDO3 on
LDO4 off
LDO5 off
Charger on
LB comp on
SYSOUT on
User presses pushbutton
connected to PWR_ON (or
EXT_ON) pin for > 320ms
(PWR_ON = H).
PMU looks at PWR_DS bit.
Because PWR_DS=1,PMU
will begin Startup sequence
starting with LDO3 and
Buck2.
PMU will force PWR_DS to 0.
SOC will pull up the
PWR_EN pin to turn
on LDO2, LDO4, and
LDO5 simultaneously.
When LDO3 AND
Buck2 reach 90%
regulation, the PMU
will turn on LDO1.
SOC reads I2C
DS_RDY bit from
PMU.
SOC first sets
DS_RDY bit to 0
and then retrieves
memory.
Figure 5: Normal Mode Deep-Sleep Mode Normal Mode Flowchart.
AAT3608
DATA SHEET
Compact Seven-Channel Regulator
with Li+/Polymer Linear Battery Charger and I2C Interface
32 Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
202214A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • July 26, 2012
Buck1 on
Buck2 on
LDO1 on
LDO2 on
LDO3 on
LDO4 on
LDO5 on
Charger on
LB comp on
SYSOUT on
Sleep Mode
Buck1 on
LDO1 on
LDO3 on
Charger on
LB comp on
SYSOUT on
LDO4 off
LDO5 off
Buck2 off
LDO2 off
If a trigger event occurs, SOC pulls
down PWR_EN which turns off Buck2,
LDO2, LDO4, and LDO5 simultaneously.
Normal Mode
Buck1 on
Buck2 on
LDO1 on
LDO2 on
LDO3 on
LDO4 on
LDO5 on
Charger on
LB comp on
SYSOUT on
Buck1 on
LDO1 on
LDO3 on
Charger on
LB comp on
SYSOUT on
LDO4 off
LDO5 off
Buck2 off
LDO2 off
If a trigger event occurs, PWR_EN
is asserted to turn on Buck2, LDO2,
LDO4, and LDO5 simultaneously.
Figure 6: Normal Mode Sleep Mode Flowchart.
User presses
pushbutton
connected to
PWR_ON pin
for >320ms.
(PWR_ON = H)
When LDO3
AND Buck2
reach 90%
regulation, PMU
will turn on
LDO1 and
Buck1
SOC will pull up
PWR_EN pin to
turn on LDO2,
LDO4, and LDO5
simultaneously.
RESET is pulled high
Normal Mode
DS_RDY = 0
PWR_DS = 0
Buck1 on
Buck2 on
LDO1 on
LDO2 on
LDO3 on
LDO4 on
LDO5 on
Charger on
LB comp on
DS_RDY = 0
PWR_DS = 0
PWR_HOLD
is maintained high
Buck1 on
Buck2 on
LDO1 on
LDO2 off
LDO3 on
LDO4 off
LDO5 off
Charger on
LB comp on
Shutdown
Startup
DS_RDY = 0
PWR_DS = 0
Buck1 off
Buck2 off
LDO1 off
LDO2 off
LDO3 off
LDO4 off
LDO5 off
Charger off
LB comp off
SYSOUT on
SYSOUT on
SYSOUT off
PMU begins
Startup sequence
starting with LDO3
and Buck2
If ADP and USB are
removed and the BAT
pin is < Low-Battery
threshold, the PMU will
automatically go back
into Shutdown mode.
All Regulators will be
turned off simultaneously.
All bucks will be in
Hi-Z mode.
All LDOs will pull
down their outputs.
Figure 7: System Shutdown Normal Mode (Initial Start-Up) Flowchart.
AAT3608
DATA SHEET
Compact Seven-Channel Regulator
with Li+/Polymer Linear Battery Charger and I2C Interface
33
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
202214A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • July 26, 2012
I2C Serial Interface and Programmability
Serial Interface
Many of the features of the AAT3608 can be controlled
via the I2C serial interface. The I2C serial interface is a
widely used interface where it requires a master to initi-
ate all the communications with the slave devices. The
I2C protocol consists of 2 active wires, SDA (serial data
line) and SCL (serial clock line). Both wires are open
drain and require an external pull up resistor to VCC
(SYSOUT may be used as VCC). The SDA pin serves I/O
function, and the SCL pin controls and references the I2C
bus. I2C protocol is a bidirectional bus which allows both
read and write actions to take place. The timing diagram
in Figure 8 depicts the transmission protocol.
START and STOP Conditions
START and STOP conditions are always generated by the
master. Prior to initiating a START condition, both the SDA
and SCL pin are idle mode (idle mode is when there is no
activity on the bus and SDA and SCL are pulled to VCC via
external resistor). As depicted in Figure 9, a START condi-
tion is defined to be when the master pulls the SDA line
low and after a short period pulls the SCL line low. A
START condition acts as a signal to all ICs that something
is about to be transmitted on the BUS. A STOP condition,
also shown in Figure 9, is when the master releases the
bus and SCL changes from low to high followed by SDA
low to high transition. The master does not issue an
ACKNOWLEDGE and releases the SCL and SDA pins.
Transferring Data
Every byte on the bus must be 8 bits long. A byte is
always sent with the most significant bit first (see Figure
8).
MSB LSB R/W
Figure 8: Bit Order.
Acknowledge Bit
The acknowledge bit is the ninth bit of data. It is used to
send back a confirmation to the master that the data has
been received properly. For acknowledge to take place,
the MASTER must first release the SDA line, then the
SLAVE will pull the data line low as shown in Figure 9.
The address is embedded in the first seven bits of the
byte. The eighth bit is reserved for the direction of the
information flow for the next byte of information. For the
AAT3608, this bit must be set to “0” when writing and
“1” when reading. The full 8-bit address including the
R/W bit is 0x9C (hex) or 10011100 in binary for writing
and 0x9D(hex) or 10011101 in binary for reading.
I2C Write Code
After sending the chip address, the master should
send an 8-bit data stream (“2ND Word”). The “2ND Word”
can consist of any one of the four sets of data listed in
Table 3.
The “3RD Word” should be entered into the I2C only if
(Bit7,Bit6,Bit5) = (0,0,0) in the “2ND Word”. In this case,
the bits (G2,G1,G0) are used to set the bit assignments
as shown in Tables 4 and 5.
AAT3608
DATA SHEET
Compact Seven-Channel Regulator
with Li+/Polymer Linear Battery Charger and I2C Interface
34 Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
202214A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • July 26, 2012
A6 A5 A4 A3 A2 A1 0 0 0 0 x x G2 G1 G0
0 0 1 D14
0 1 0
0 1 1
D13D12D11D10
D24D23D22D21D20
D34D33D32D31D30
0 1 E15 E14E1 3E12E1 1E10
1 0 E25 E24E2 3E22E2 1E20
1 1 E35 E34E3 3E32E3 1E30
0 1 F1 5F14F13F12F11F10
G2:0=3'b000
G2:0=3'b010
I2C Address2nd Word 3rd Word
START STOP
STOP
STOP
STOP
SCL
SDA A6 A5 A0 WA
0
Write command
from the master.
Acknowledge
from the slave.
R/W
START
0
STOP
Dx4 Dx0
STOP
A
Acknowledge
from the slave.
START command
from the master.
STOP command
from the master.
SCL
SDA
D1<4 :0>
D2<4 :0>
D3<4 :0>
E1<5 :0>
E2<5 :0>
E3<5 :0>
F1<5 :0>
I2C Controller
01 or 10 or 11
72819
A<6: 0>
Data Data Data Data
ACKACK ACK
Figure 9: I2C Protocol.
Bit7 Bit6 Bit5 Bit4 Bit3 Bit2 Bit1 Bit0
0 0 0 0 0 G2 G1 G0
0 0 1 ENLDO5 ENLDO4 DS_RDY PWR_DS Reserved
0 1 0 LDO51LDO50LDO41LDO40ENCHG
0 1 1 BUCK24 and LDO34BUCK23 and LDO33BUCK22 and LDO32BUCK21 and LDO31BUCK20 and LDO30
Table 3: I2C “2nd Word” Bit Assignments.
AAT3608
DATA SHEET
Compact Seven-Channel Regulator
with Li+/Polymer Linear Battery Charger and I2C Interface
35
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Bit7 Bit6 Bit5 Bit4 Bit3 Bit2 Bit1 Bit0
0 1 ENLDO3 ENLDO2 ENLDO1 ENBUCK1 ENBUCK2 PWR_EN Mask
1 0 PWR_IN IN Mask PWR_IN OUT Mask Reserved LBO Mask TIME OUT Mask CHG DONE Mask
Table 4: I2C “3rd Word” Bit Assignments for (G2,G1,G0) = (0,0,0)
Bit7 Bit6 Bit5 Bit4 Bit3 Bit2 Bit1 Bit0
0 1 Test Modes
Table 5: I2C “3rd Word” Bit Assignments for (G2,G1,G0) = (0,1,0).
BUCK24
LDO34
BUCK23
LDO33
BUCK22
LDO32
BUCK21
LDO31
BUCK20
LDO30LDO3 Output Voltage BUCK2 FB Voltage
0 0 0 0 0 1.000V 0.5000V
0 0 0 0 1 1.025V 0.5125V
0 0 0 1 0 1.050V 0.5250V
0 0 0 1 1 1.075V 0.5375V
0 0 1 0 0 1.100V 0.5500V
0 0 1 0 1 1.125V 0.5625V
0 0 1 1 0 1.150V 0.5750V
0 0 1 1 1 1.175V 0.5875V
0 1 0 0 0 1.200V (Default) 0.6000V (Default)
0 1 0 0 1 1.225V 0.6125V
0 1 0 1 0 1.250V 0.6250V
0 1 0 1 1 1.275V 0.6375V
0 1 1 0 0 1.300V 0.6500V
0 1 1 0 1 1.325V 0.6625V
0 1 1 1 1 1.350V 0.6750V
0 1 1 1 1 1.375V 0.6875V
1 X X X X 1.400V 0.7000V
Table 6: Buck2 and LDO3 Output Voltage.
LDO41LDO40LDO4 Output Voltage LDO51LDO50LDO5 Output Voltage
0 0 1.8V 0 0 1.2V
0 1 2.5V (Default) 0 1 1.5V
1 0 2.85V 1 0 3.0V
1 1 3.3V 1 1 3.3V (Default)
Table 7: LDO4 Output Voltage. Table 8: LDO5 Output Voltage.
AAT3608
DATA SHEET
Compact Seven-Channel Regulator
with Li+/Polymer Linear Battery Charger and I2C Interface
36 Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
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Interrupt (Read from I2C)
A single byte is used when reading I2C data from the
AAT3608. The R/W address should be set to 1 so that
complete address of the chip would be 0x9D or
10011101 in binary.
The INT (interrupt) pin is an open drain output which
pulls low when there is an assertion in any one of the
status bits (except the DS_RDY and PWR_DS bits).
When a Read from the I2C is initiated AND completed by
the SOC, the INT pin is released and the voltage will go
high through the external pull-up resistor.
ENCHG Description DS_RDY Description
0 Turn off Battery Charger 0 (Default)
1Turn on Battery Charger (Default) 1Deep Sleep Recognition Flag
ENBUCK1 Description PWR_DS Description
0 Turn off Buck1 0 (Default)
1Turn on Buck1 (Default) 1Force PMU to go into Deep Sleep Mode
ENBUCK2 Description PWR_EN Mask Description
0 Turn OFF Buck2 0 No Masking
1Turn ON Buck2 (Default) 1Mask the PWR_EN pin ability to control BUCK2 (Default)
ENLDO1 Description PWR_IN IN Mask Description
0 Turn OFF LDO1 0 No Masking
1Turn ON LDO1 (Default) 1Prevent an interrupt from being generated if the
PWR_IN IN bit has been asserted (Default)
ENLDO2 Description PWR_IN OUT Mask Description
0 Turn OFF LDO2 0 No Masking
1Turn ON LDO2 only if PWR_EN pin is
High (Default) 1Prevent an interrupt from being generated if the
PWR_IN OUT bit has been asserted (Default)
ENLDO3 Description LBO Mask Description
0 Turn OFF LDO3 0 No Masking
1Turn ON LDO3 (Default) 1Prevent an interrupt from being generated if the LBO
comparator has been asserted (Default)
ENLDO4 Description TIMEOUT Mask Description
0 Turn OFF LDO4 0 No Masking
1Turn ON LDO4 (Default) 1Prevents an interrupt from being generated if the
TIMEOUT bit has been asserted (Default)
ENLDO5 Description CHG_DONE Mask Description
0 Turn OFF LDO5 0 No Masking
1Turn ON LDO5 (Default) 1Prevent an interrupt from being generated if the charger
has reached End-of-Charge (Default)
Table 9: Enable Settings.
Bit7 Bit6 Bit5 Bit4 Bit3 Bit2 Bit1 Bit0
PWR_IN IN PWR_IN OUT Reserved LBO TIME OUT CHG_DONE DS_RDY PWR_DS
Table 10: I2C Read Table.
AAT3608
DATA SHEET
Compact Seven-Channel Regulator
with Li+/Polymer Linear Battery Charger and I2C Interface
37
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PWR_IN IN Bit Description
Interrupt Signal
Produced?
0 Default Only if PWR_IN IN Mask
bit is not set
1If VPWR_IN > UVLO threshold, this bit will be set
PWR_IN OUT Bit Description
Interrupt Signal
Produced?
0 Default Only if PWR_IN OUT
Mask bit is not set
1If VPWR_IN < UVLO threshold, this bit will be set
TIMEOUT Bit Description
Interrupt Signal
Produced?
0 Default Only if TIMEOUT Mask
bit is not set
1If the charger watchdog timer has reached Timeout, this bit will be set.
LBO Bit Description
Interrupt Signal
Produced?
0 Default Only if LBO Mask bit is
not set
1If Low-Battery comparator is tripped then this bit will be set.
CHG DONE Bit Description
Interrupt Signal
Produced?
0 Default Only if CHG_DONE
Mask bit is not set
1If the Charger has reached End-Of-Charge (EOC), this bit will be set
DS_RDY Bit Description
Interrupt Signal
Produced?
0 Default No INT signal
1Same as the DS_RDY bit described in the "I2C Write" section of this datasheet
PWR_DS Bit Description
Interrupt Signal
Produced?
0 Default No INT signal
1Same as the PWR_DS bit described in the "I2C Write" section of this datasheet
Table 11: Status Bit Descriptions.
AAT3608
DATA SHEET
Compact Seven-Channel Regulator
with Li+/Polymer Linear Battery Charger and I2C Interface
38 Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
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Application Information
The two bucks are high performance 800mA 1.5MHz
monolithic step-down converters. They have been
designed with the goal of minimizing external compo-
nent size and optimizing efficiency over the complete
load range. Apart from the small bypass input capacitor,
only a small L-C filter is required at the output.
Both bucks can be programmed with external feedback
resistors to any voltage, ranging from 0.6V to the input
voltage in default feedback voltage condition.
At dropout, the step down converters duty cycle increas-
es to 100% and the output voltage tracks the input volt-
age minus the RDSON drop of the P-channel high-side
MOSFET.
Output Voltage Resistor Selection
Resistors R2 through R5 in Figure 10 program the output
to regulate at a voltage higher than 0.6V in default
mode. The feedback voltage of Buck2 can have a wider
range and can be adjusted down to 0.5V through I2C. To
limit the bias current required for the external feedback
resistor string while maintaining good noise immunity, a
suggested value for R3 and R5 is 59kΩ to provide a bias
current of 10uA with a feedback voltage of 0.6V.
Although a larger value will further reduce quiescent
current, it will also increase the impedance of the feed-
back node, making it more sensitive to external noise
and interference. Table 12 summarizes the resistor val-
ues for various output voltages with R3 and R5 set to
either 59kΩ for good noise immunity or 100kΩ for
reduced no load input current.
VOUT
(V)
R3 and R5 = 59kΩ
R2 and R4 (kΩ)
R3 and R5 = 100kΩ
R2 and R4 (kΩ)
0.8 19.6 33.2
0.9 29.4 49.9
1 39.2 66.5
1.1 49.9 82.5
1.2 59 100
1.3 68.1 118
1.4 78.7 133
1.5 88.7 150
1.8 118 200
1.85 124 210
2137 232
2.5 187 316
3.3 267 453
Table 12: Feedback Resistors
(Feedback Voltage = 0.6V).
Input Capacitor (Bucks)
All input capacitors should be located as physically close
to the power pin (INBUCK) and power ground pins
(PGND1 and 2). Ceramic capacitors are recommended
for their higher current operation and small profile. Also,
ceramic capacitors are inherently capable to withstand
input current surges from low impedance sources such as
batteries in portable devices over tantalum capacitors.
Typically, 10V or 16V rated capacitors are required.
The following are the typical recommended capacitance
values:
Two 10μF capacitors for INBUCK
One 10μF capacitor for INLDO
One 10μF capacitor for SYSOUT
One 10μF capacitor for PWR_IN
One 10μF capacitor for BAT
Output Capacitor (Bucks)
For proper load voltage regulation and operational stabil-
ity, a capacitor is required on the output of each buck.
The output capacitor connection to the ground pin
should be made as directly as practically possible for
maximum device performance. Since the bucks have
been designed to function with very low ESR capacitors,
a 4.7μF ceramic capacitor is recommended for best per-
formance.
Inductor Selection
The two bucks use peak current mode control with slope
compensation to maintain stability for duty cycles great-
er than 50%. The output inductor value must be select-
ed so the inductor current down slope meets the internal
slope compensation requirements. The internal slope
compensation is 1A/μs. The inductor should be set equal
to the output voltage numeric value in micro henries
(μH). This guarantees that there is sufficient internal
slope compensation.
Inductor manufacturer’s specifications list both the
inductor DC current rating, which is a thermal limitation,
and the peak current rating, which is determined by the
saturation characteristics. The inductor should not show
any appreciable saturation under normal load condi-
tions. Some inductors may meet the peak and average
current ratings yet result in excessive losses due to a
high DCR. Always consider the losses associated with
the DCR and its effect on the total converter efficiency
when selecting an inductor.
AAT3608
DATA SHEET
Compact Seven-Channel Regulator
with Li+/Polymer Linear Battery Charger and I2C Interface
39
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Input Capacitor (LDOs)
Typically, a 10μF or larger capacitor, C4 (see Figure 10),
is recommended as close as possible to the device
INLDO pin. The input capacitor value of 10μF will offer
superior input line transient response and will assist in
maximizing the highest possible power supply ripple
rejection.
There is no specific capacitor ESR requirement; there-
fore ceramic, tantalum, or aluminum electrolytic capaci-
tors may be selected for capacitor C4. However, ceramic
capacitors are recommended due to their inherent capa-
bility over tantalum capacitors to withstand input cur-
rent surges from low impedance sources such as batter-
ies in portable devices.
Output Capacitor (LDOs)
For proper load voltage regulation and operational sta-
bility, a 4.7µF ceramic capacitor is required between the
output of the LDOs and GND. If desired, the output
capacitor may be increased without limit. The output
capacitor connection to the LDO regulator ground pin
should be made as direct as practically possible for
maximum device performance.
Although the device is intended to operate with low ESR
capacitors, it is stable over a very wide range of capaci-
tor ESR, thus it will also work with higher ESR tantalum
or aluminum electrolytic capacitors. However, for best
performance, ceramic capacitors are recommended.
Layout Guidance
Figure 10 is the schematic for the evaluation board. The
evaluation board has extra components for easy evalua-
tion; the bill of materials for the system is shown in
Table 12. When laying out the PC board, the following
layout guidelines should be followed to ensure proper
operation of the AAT3608:
1. The exposed pad (EP) must be reliably soldered to
exposed copper pad on the board and electrically
connected to GND/PGND pins.
2. The power traces, including GND traces, the LX
traces and the VIN trace should be kept short, direct
and wide to allow large current flow. Use several via
pads when routing between layers.
3. The input capacitors should be connected as close as
possible from SYSOUT and INBUCK to PGND1 and
PGND2 to get good power filtering.
4. Keep the switching node LX away from the sensitive
buck feedback nodes, FB1 and FB2.
5. The feedback trace for the bucks should be separate
from any power trace and connected as closely as
possible to the load point. Sensing along a high cur-
rent load trace will degrade DC load regulation.
6. The output capacitors and inductors should be con-
nected as close as possible and there should not be
any signal lines under the inductor.
7. The resistance of the trace from the load return to
PGND1 and PGND2 should be kept to a minimum.
This will help to minimize any error in DC regulation
due to differences in the potential of the internal
signal ground and the power ground.
AAT3608
DATA SHEET
Compact Seven-Channel Regulator
with Li+/Polymer Linear Battery Charger and I2C Interface
40 Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
202214A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • July 26, 2012
J2J1
J4
SYSOUT
SYSOUT
J8
J9
J10
J11
J12
LDO1
LDO1
LDO2
LDO3
LDO4
LDO5
LDO2
LDO3
LDO4
LDO5
C13
4.7µF
C14
4.7µF
C12
0.1µF
C1
0.1µF
C3
10µF
C2
10µF
C9
100pF
C15
4.7µF
C16
4.7µF
C17
4.7µF
C10
4.7µF
C8
4.7µF
RESET
RESET
J6
J27Buck 2
J3
Buck 1
BUCK2
BUCK1
P35,36
xRESET
RESET
L2 2.2µH
L1 2.2µH
PWR_ID
USBSEL
STAT
STAT
PBSTAS
PBSTAS
VBAT
VBAT
VBAT
VBAT
BATBAT
VIN
VIN
VIN
PWR_ON
SW1
PWR_ON
J5
SCL
SYSOUT
SYSOUT
SYSOUT
SYSOUT
SYSOUT
VBAT
R17
10K
R12
10K
R21
100K
R4
100K
R3
100K
R2
316K
R5
100K
R20
1M
R15
2M
R16
1M
R14
100K
R6
1.24K
R19
1.5K
R13
10K
R18
10K
LBI
LBI
LBO
LBO
S2
S1
1M 1M 1M 1M 1M
R7 R8
INT
INT
PWR_EN
1
2
TB1
TB-2
TB2
TB-2
1
2
1
2
3
4
5
6
12
11
10
9
8
7
S1
SW DIP-6
SYSOUT
D1
LED2
R9 R10R11
1
2
3
J17
J18
J19
J13
J21J20
J16
J15
J14
1
2
1
2
TB4
TB-2
TB3
TB-2
FB = 0.6V
1
2
3
J7
3-PIN_JUMPER
SYSOUT
VBAT
VBAT
TS
TS
STAT
1
ISETA
2
TS
3
TC
4
17 26 22
LDO2 5
6
LDO3 7
LDO1 8
INLDO
INLDO
9
LDO4 10
LDO5 11
PBSTAS
12
13
INT
14
LBO
15
LBI
16
S2
18
S1
19
PWR_EN
20
21
23
INBUCK 24
LX125
FB1
LX2
FB2
27
SDA
30
SCL
31
PWR_HOLD
32
PWR_ON
33
EXT_ON
34
35
SYSOUT
SYSOUT
3
39 38 29 28
6
PWR_ID
PWR_INPWR_IN
37
USBSEL
STAT
TS
PBSTAS
INT
LBO
LBI
S2
S1
PWR_EN
SDA
SCL
PWR_HOLD
PWR_ON
EXT_ON
EXT_ON
PWR_ID
USBSEL 40
U1
AAT3608
1
2
3
3-PIN_JUMPER
BUCK1
PWR_HOLD
P24P24
C4
10µF
C5
10µF
C6
10µF
C7
10µF
P6,9
Star Ground is the Exposed Pad:
Connect all Ground Planes at the
Exposed Pad
C19
100pF
C18
100pF
1 2
3 4
5 6
7 8
910
P1
Header 5X2
SDA
VIO
PGND
PGND
PGND
PGND
PGNDPGND
PGND
GND
GNDGND GND
PGND
PGND
PGND
PGND
GNDPGND1
PGND1
PGND2
PGND2
PGND
PGND
PGNDPGND1PGND2PGND
GND
GND
PGND2
PGND1
PGND
PGND PGND
PGND
J23
J22
J25J24 J28J29 LX2
J26
LX1
Figure 10: AAT3608 Evaluation Board Schematic.
AAT3608
DATA SHEET
Compact Seven-Channel Regulator
with Li+/Polymer Linear Battery Charger and I2C Interface
41
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Figure 11: AAT3608 Evaluation Board Silk Screen Layer.
Figure 12: AAT3608 Evaluation Board Top Layer. Figure 13: AAT3608 Evaluation Board
Mid Layer 1 (GND Plane).
AAT3608
DATA SHEET
Compact Seven-Channel Regulator
with Li+/Polymer Linear Battery Charger and I2C Interface
42 Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
202214A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • July 26, 2012
Figure 14: AAT3608 Evaluation Board Figure 15: AAT3608 Evaluation Board
Mid Layer 2 (SYSOUT). Bottom Layer.
Description Value Quantity Footprint
U1 Battery Charger PMU 1 TQFN55-40L
J1, J2, J3, J4, J5, J6, J8, J9,
J10, J11, J12, 13, J14,J15, J16,
J18, J20, J21, J22, J23, J24,
J25, J26, J27, J28, J29
Test Point 26 TP
TB1, TB2, TB3, TB4 Terminal Block Connector 2 Positions -
DigiKey 277-1273-ND 4 TBLOK2
SW1 Switch Tact, SPST, 5mm - C&K Components
PTS645TL50 LFS 1 SW-2
P1 Header, 5-Pin, Dual row 1 HDR2X5
J7, J17, J19 1X3 Header 3 HDR1X3
S1 DIP Switch, 6 Position, SPST 1 DIP-12/SW
L1, L2 Inductor 2.2µH 2 CDRH4D16
D1 Typical red, green, yellow, amber GaAs LED 1 1206LED - duplicate
C2, C3, C4, C5,C6,C7 Ceramic Capacitor 10µF 6 0805
C8 Ceramic Capacitor 4.7µF 1 0805
C1, C12 Ceramic Capacitor 0.1µF 2 0603
C10, C13, C14, C15, C16, C17 Ceramic Capacitor 4.7µF 6 0603
C9, C18, C19 Ceramic Capacitor 100pF 3 0603
R12, R13, R17, R18 Resistor 10K 4 0603
R15 Resistor 2M 1 0603
R19 Resistor 1.5K 1 0603
R2 Resistor 316K 1 0603
R3, R4, R5, R14, R21 Resistor 100K 5 0603
R6 Resistor 1.24K 1 0603
R7, R8, R9, R10, R11, R16, R20 Resistor 1M 70603
Table 12: AAT3608 Evaluation Board Bill of Materials (BOM).
AAT3608
DATA SHEET
Compact Seven-Channel Regulator
with Li+/Polymer Linear Battery Charger and I2C Interface
43
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
202214A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • July 26, 2012
1. XYY = assembly and date code.
2. Sample stock is generally held on part numbers listed in BOLD.
3. Available exclusively outside of the United States and its territories.
4. The leadless package family, which includes QFN, TQFN, DFN, TDFN and STDFN, has exposed copper (unplated) at the end of the lead terminals due to the manufacturing
process. A solder fillet at the exposed copper edge cannot be guaranteed and is not required to ensure a proper bottom solder connection.
Ordering Information
Package Marking1Part Number (Tape and Reel)2, 3
TQFN55-40 C8XYY AAT3608IIC-1-T1
Skyworks Green™ products are compliant with
all applicable legislation and are halogen-free.
For additional information, refer to Skyworks
Definition of Green™, document number
SQ04-0074.
Package Information
TQFN55-404
Top View
Side View
Bottom View
5.000 ± 0.050
5.000 ± 0.050
Pin 1 Dot
by Marking
Pin 1 Identification
Chamfer 0.300 x 45°
3.600 ± 0.050
3.600 ± 0.050
0.450 ± 0.050
0.380 ± 0.050
0.200 ± 0.0500.400 BSC
0.750 ± 0.050
0.000 + 0.100
- 0.000
0.203 REF
All dimensions in millimeters.
AAT3608
DATA SHEET
Compact Seven-Channel Regulator
with Li+/Polymer Linear Battery Charger and I2C Interface
44 Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
202214A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • July 26, 2012
Copyright © 2012 Skyworks Solutions, Inc. All Rights Reserved.
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responsibility whatsoever for conicts, incompatibilities, or other difculties arising from any future changes.
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use or sale.
Customers are responsible for their products and applications using Skyworks products, which may deviate from published specications as a result of design defects, errors, or operation of products outside of pub-
lished parameters or design specications. Customers should include design and operating safeguards to minimize these and other risks. Skyworks assumes no liability for applications assistance, customer product
design, or damage to any equipment resulting from the use of Skyworks products outside of stated published specications or parameters.
Skyworks, the Skyworks symbol, and “Breakthrough Simplicity” are trademarks or registered trademarks of Skyworks Solutions, Inc., in the United States and other countries. Third-party brands and names are for
identication purposes only, and are the property of their respective owners. Additional information, including relevant terms and conditions, posted at www.skyworksinc.com, are incorporated by reference.
