AAT3673IXN-4.2-3-T1 - Skyworks Solutions, Inc.

AAT3673

DATA SHEET

1.6A Dynamic Battery Charger and Power Manager

Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com

201881B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • April 25, 2012

Typical Application

ADP

CHRADP

BAT

AAT3673-1/-2/-4/-5

OUT

dapter Input

System Load

STAT2

Battery

Pack

ENO

ENBAT

STAT1

Enable

Enable Input to Output

Enable Battery to Out

ADPSET

TERM

GND

CHR Threshold

Temp

BAT+

CBAT

10μF

10kΩ

CBYP

RADP RTERM

CADP

10μF

BYP

ADP

CHRADP

BAT

AAT3673-3/-6

OUT

Adapter Input

System Load

EN2

EN1

Battery

Pack

ENO

ENBAT

STAT1

EN1

Enable Input to Output

Enable Battery to Out

ADPSET

TERM

GND

CHR Threshold

Temp

BAT+

EN2

BYP

CBAT

10μF

10kΩ

CBYP

RADP RTERM

CADP

10μF

General Description

The AAT3673 BatteryManager is a highly integrated sin-

gle-cell (4.2V) lithium-ion/polymer battery charger and

system power management IC that enables simultane-

ous battery charging and system load management. For

increased safety, the AAT3673 includes over-voltage

input protection (OVP) up to 28V.

The AAT3673 provides charging current and system

power management from a single input that may be sup-

plied by an AC adapter or USB port power source (ADP).

This device allows the user to program the battery

charge current up to 1.6A depending on the current

shared with the system output. A battery charge timeout

timer is provided for charging safety and the charge ter-

mination current is also user-programmable.

The AAT3673 employs a battery charge current reduc-

tion function that enables continued system operation in

the event the input source can not supply the required

load current. When operated under excessive thermal

conditions, the AAT3673 has a digitally controlled ther-

mal loop which allows the maximum possible charging

current for any given ambient temperature condition.

Battery temperature, voltage and charge state are mon-

itored for fault conditions. The AAT3673-1/-2/-4/-5 has

two status monitor output pins (STAT1 and STAT2), and

the AAT3673-3/-6 has one status monitor output (STAT1)

provided to indicate battery charge status by directly

driving external LEDs.

The AAT3673 is available in a Pb-free, thermally

enhanced, space-saving 16-pin 4 × 4mm TDFN package.

Features

• System Load Power Control from Either ADP or

Battery

• ADP Presence Automatically Routes Power from

Source to Load and Charges Battery

• Automatic Charge Reduction Loop to Minimize

Charge Time with USB Input

• 4.0V~6.5V Input Voltage Range

• Over-Voltage Input Protection (OVP) up to 28V

• Digitally Controlled Thermal Protection

• Battery Power Enable

• Programmable Battery Charge Timer

• Battery Cell Temperature Sensing

• Charge Status Reporting (LEDs)

• Automatic Recharge Sequencing

• Battery Over-Voltage, Over-Current, and

Over-Temperature Protection

• System Load Current Limiting

• 16-pin 4 × 4mm TDFN Package

Applications

• Cellular Phones

• Digital Still Cameras

• Digital Video Cameras

• Global Positioning Systems (GPS)

• MP3 Players

• Handheld PCs

AAT3673

DATA SHEET

1.6A Dynamic Battery Charger and Power Manager

Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com

201881B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • April 25, 2012

Pin Descriptions

Pin # Name Type Function

1 ADPSET I Connect a resistor from this pin to GND to set the ADP fast charge constant current. The programmed

constant current level should be less than the ADP current limit set by ADPLIM speciﬁ cation (ILIM_ADP).

2 ADP I Adapter input, source of system load and battery charging. Connect a 1F (minimum) ceramic ca-

pacitor as close as possible between ADP and GND.

3 BYP I Input for the over-voltage protection bypass node. Connect a 1F (minimum) ceramic capacitor be-

tween this pin and GND.

4STAT1 O

This open-drain MOSFET device is for charger status reporting. If used for status indication display,

connect an LED Cathode to this node with a series ballast resistor. Connect the LED anode to OUT or

BYP.

STAT2 O

AAT3673-1/-2/-4/-5: This open-drain MOSFET device is for charger status reporting. If used for sta-

tus indication display, connect an LED cathode to this node with a series ballast resistor. Connect the

LED anode to OUT or BYP.

EN2 I AAT3673-3/-6: The EN2 pin (internal pull-up) is used together with the EN1 pin; see Table 2 in the

"Functional Description" section of this datasheet.

6 GND I/O Common ground connection.

EN I

AAT3673-1/-2/-4/-5: Input enable (internal pull-up). Low to enable the ADP switch and battery

charging path; high to disable the ADP switch and battery charging function. See Table 1 in the

"Functional Description" section of this datasheet.

EN1 I AAT3673-3/-6: The EN1 pin (internal pull-up) is used together with the EN2 pin; see Table 2 in the

"Functional Description" section of this datasheet.

8ENO I Enable Input power to OUT, the dynamic power path from the ADP input to the system load. Active

low input (internal pull-up).

9ENBAT I Battery load switch enable, active low. Battery load switch control the power path between the bat-

tery cell and OUT (internal pull-up).

10, 11 BAT I/O Battery pack (+) connection. For best operation, a 1F (minimum) ceramic capacitor should be

placed as close as possible between BAT and GND.

12 CHRADP I

Adaptor mode charge reduction voltage threshold programming pin. The ADP charge reduction

threshold may be adjusted from the default value by placing a voltage divider between this pin to

VADP and GND to this pin.

13 TERM I Connect a resistor between this pin and GND to program the charge termination current threshold.

The charge termination current level can be disabled by connecting this pin to BYP.

14 TS I

Battery temperature sensing input. For typical applications, connect a 10k resistor from BYP to this

pin and a 10k NTC thermistor located inside the battery pack under charge to this pin and GND to

sense battery over temperature conditions during the charge cycle. To disable the TS function, con-

nect this pin to GND.

15 OUT O System dynamic power output supplied from the ADP input, BAT or both. Connect a 10F ceramic

capacitor between this pin and GND.

16 CT I

Battery charge timer input pin, connect a capacitor on this pin to set the ADP charge timers. Typi-

cally, a 0.1F ceramic capacitor is connected between this pin and GND. To disable the timer circuit

function, connect this pin directly to GND.

EP EP I/O Exposed paddle (package bottom). Connect to GND plane under the device.

AAT3673

DATA SHEET

1.6A Dynamic Battery Charger and Power Manager

Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com

201881B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • April 25, 2012

Pin Configuration

TDFN44-16

(Top View)

AAT3673-1/-2/-4/-5 AAT3673-3/-6

BYP

STAT1

STAT2

DPSET

ADP

GND

ENO

TERM

CHRADP

OUT

BAT

ENBAT

BYP

STAT1

EN2

DPSET

ADP

GND

EN1

ENO

TERM

CHRADP

OUT

BAT

ENBAT

Absolute Maximum Ratings

Symbol Description Value Units

VIN ADP Continuous 30

VP BAT, OUT, BYP <30ms, Duty Cycle < 10% -0.3 to 8

EN/EN1, ENO, ENBAT, STAT1, STAT2/EN2 -0.3 to 8

VNTS, CT, ADPSET, TERM, CHRADP -0.3 to 8

TJJunction Temperature Range -40 to 150

°CTAOperating Temperature Range -25 to 85

TLEAD Maximum Soldering Temperature (at Leads, 10 sec) 300

Thermal Information1, 2

Symbol Description Value Units

JA Maximum Thermal Resistance 46 °C/W

JC Maximum Thermal Resistance 26

PDMaximum Power Dissipation 2.0 W

1. Mounted on 1.6mm thick FR4 circuit board.

2. Derate 50mW/°C above 25°C ambient temperature.

AAT3673

DATA SHEET

1.6A Dynamic Battery Charger and Power Manager

Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com

201881B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • April 25, 2012

Electrical Characteristics

VADP = 5V, TA = -25°C to +85°C; unless otherwise noted, typical values are TA = 25°C.

Symbol Description Conditions Min Typ Max Units

Operation

VOVP Input Over Voltage Protection Range 28

VADP AC Adapter / USB Operating Voltage Range 4.0 6.5

VBAT Battery Operating Voltage Range 3.0 VCO(REG)

VOUT ADP to OUT Voltage Regulation

VADP = 5V, IOUT = 100mA, TA = 25°C 4.33 4.40 4.47

VADP = 4.8V to 6.5V, IOUT = 0mA to

400mA, TA = -25°C to +85°C 4.26 4.4 4.54

VDO ADP to OUT Regulator Dropout1IOUT = 400mA 150 250 mV

VUVLO_ADP ADP Under-Voltage Lockout Rising Edge 3.1 3.9

Hysteresis 0.1

VUVLO_BAT BAT Under-Voltage Lockout Rising Edge 2.8 2.9 3.0

Hysteresis 0.1

IADP_OP ADP Normal Operating Current VADP = 5V, VEN = 0V, ICC = 1A 0.8 1.6 mA

IADP_SHDN ADP Shutdown Mode Current

(OVP is Still Active)

VADP = 5V, VEN = 5V, VENBAT = 5V,

No Load 360

A

IBAT_OP Battery Operating Current VBAT = VCO(REG), VADP = VENBAT = GND

No Load 100 250

IBAT_SLP Battery Sleep Current VBAT = VCO(REG), VADP = 5V,

VEN = VENBAT = 5V 510

IBAT_SHDN Leakage Current from BAT Pin VBAT = VCO(REG), VENBAT = VADP = 5V 2

Over-Voltage Protection

VOVPT Over-Voltage Protection Trip Voltage VADP Rising Edge 6.5 6.75 7.0 V

Hysteresis 100 mV

VDO_OVP Dropout Voltage Between ADP and BYP Pins VADP = 5V, IADP = 500mA 100 200

TRESPOV Over-Voltage Protection Response Time Step up VADP from 6V to 8V 0.5 s

Options -1, -2, -3

TOVPON_130sOVP Switch Release Delay Time VADP voltage step down from 8V to

6V, RLOAD = 100, CBYP = 1F130

s

TOVPSTARTON_130sOVP Switch Start Up Delay Time VADP voltage step up from 0V to

5V, RLOAD = 100, CBYP = 1F150

Options -4, -5, -6

TOVPON_80ms OVP Switch Release Delay Time VADP voltage step down from 8V to

6V, RLOAD = 100, CBYP = 1F80

TOVPSTARTON_80ms OVP Switch Start Up Delay Time VADP voltage step up from 0V to

5V, RLOAD = 100, CBYP = 1F80

Power Switches

RDS(ON)_SWA ADP-to-OUT FET On Resistance VADP = 5.0V 600

mRDS(ON)_SWB BAT-to-OUT FET On Resistance VBAT = 4.1V 60

RDS(ON)_CHA ADP Battery Charging FET On-Resistance VADP = 5.0V 600

Battery Charge Voltage Regulation

VCO(REG) Output Charge Voltage Regulation 4.158 4.20 4.242

VMIN Preconditioning Voltage Threshold 2.8 2.9 3.0

VRCH Battery Recharge Voltage Threshold VCO(REG)

- 0.17

VCO(REG)

- 0.1

VCO(REG)

- 0.05

VCHR_TH Default ADP Charge Reduction Threshold CHRADP Open; Reduce Charge

Current When ADP is Below VCHR_TH 4.5

VCHR_REG CHRADP Pin Voltage Accuracy VADP = 4.5V 1.9 2.0 2.1

1. VDO is defined as VADP - VOUT when VOUT is 98% of normal.

AAT3673

DATA SHEET

1.6A Dynamic Battery Charger and Power Manager

Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com

201881B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • April 25, 2012

Electrical Characteristics (continued)

VADP = 5V, TA = -25°C to +85°C; unless otherwise noted, typical values are TA = 25°C.

Symbol Description Conditions Min Typ Max Units

Current Regulation

ILIM_ADP ADP Current Limit (Fixed) 1.6 A

ILIM_BAT BAT_OUT Current Limit (Fixed) 2.3

ICH_CC_ADP ADP Charge Constant Current Charge Range 100 1600 mA

ICH_CC_ADP/

ICH_CC_ADP Constant Current Charge Current Regulation Tolerance ICH_CC_ADP = 1A -12 12 %

ICH_TKL_ADP ADP Trickle Charge Current 10 %

ICH_CC_ADP

VADPSET ADPSET Pin Voltage Regulation 2

VTERM TERM Pin Voltage Regulation 2

KI_CC_ADP Constant Current Charge Current Set Factor: ICH_ADP/

IADPSET 29300

KI_TERM Termination Current Set Factor: ICH_TERM/ITERM 2000

AAT3673-3 Only

CH_LO USB Low Level Charge Current (Fixed) VEN1 = VEN2 = 0 85 100 mA

ICH_HI USB High Level Charge Current (Fixed) VEN1 = 0; VEN2 = 5V 450 500

Logic Control/Protection

VEN Input High Threshold 1.6

Input Low Threshold 0.4

VSTATx Output Low Voltage STATx Pin Sinks

8mA 0.4

TC Fast Charge (Trickle Charge + Constant Current +

Constant Voltage Charges Together) Timeout CCT = 0.1F 7 Hour

TTKL Trickle Charge Timeout TC/8 Min

VOVP Battery Over-Voltage Protection Threshold VCO(REG)

+ 0.1

VCO(REG)

+ 0.15

VCO(REG)

+ 0.2 V

IOCP Battery Charge Over-Current Protection Threshold In All Modes 100 % ICH_CC

TS1 High Temperature Threshold Threshold 28 30 32 % VBYP

TS2 Low Temperature Threshold Threshold 58 60 62

TLOOP_IN Digital Thermal Loop Entry Threshold 115

°C

TLOOP_OUT Digital Thermal Loop Exit Threshold 95

TLOOP_REG Digital Thermal Loop Regulated Temperature 100

TSHDN Chip Thermal Shutdown Temperature Threshold 140

Hysteresis 15

AAT3673

DATA SHEET

1.6A Dynamic Battery Charger and Power Manager

Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com

201881B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • April 25, 2012

Typical Characteristics

Adapter Supply Operating Current vs. RADPSET

RSET (kΩ)

IQ (mA)

10 100 1000

0.7

0.8

0.9

1.0

1.1

1.2

Constant Current

Pre-Conditioning

Constant Charge Current vs. RADP

RADP (kΩ)

Constant Charge Current (mA)

10 100 1000

100

1000

10000

Constant Current

Pre-Conditioning

Output Charge Voltage Regulation

Accuracy vs. Adapter Voltage

(VCO(REG) = 4.2V)

VADP (V)

Accuracy (%)

5 5.25 5.5 5.75 6 6.25 6.5

-0.25

-0.20

-0.15

-0.10

-0.05

0.00

0.05

0.10

0.15

0.20

0.25

Constant Output Charge Voltage

vs. Temperature

Temperature (°

Battery Voltage (V)

-25 15 55-5 35 75-15 25 6554585

4.193

4.194

4.195

4.196

4.197

4.198

4.199

4.200

4.201

Battery Sleep Current vs. Temperature

Temperature (°

Battery Sleep Current (μA)

-25 -5 15 35 55 75-15 5 25 45 65 85

4.0

4.2

4.4

4.6

4.8

5.0

5.2

5.4

5.6

5.8

6.0

Operating Current vs. Temperature

Temperature (°

IOP (mA)

-25 15 55-5 35 75-15 25 6554585

0.70

0.72

0.74

0.76

0.78

0.80

0.82

0.84

0.86

0.88

0.90

AAT3673

DATA SHEET

1.6A Dynamic Battery Charger and Power Manager

Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com

201881B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • April 25, 2012

Typical Characteristics

Constant Charging Current

vs. Adapter Voltage

Adapter Voltage (V)

Constant Charging Current (mA)

4 4.5 5 5.5 6 6.54.25 4.75 5.25 5.75 6.25

700

750

800

850

900

950

1000

1050

1100

VBAT = 3.6V

VBAT = 3.9V

VBAT = 4.1V

Charging Current vs. Battery Voltage

Battery Voltage (V)

Chargin Current (mA)

2.5 3 3.5 43.25 4.25 4.52.75 3.75

200

400

600

800

1000

1200 1A

500mA

100mA

Preconditioning Voltage Threshold

vs. Temperature

Temperature (°

Battery Voltage (V)

2.86

2.87

2.88

2.89

2.90

2.91

2.92

2.93

2.94

-25 15 55-5 35 75-15 25 6554585

Preconditioning Voltage Threshold

vs. Adapter Voltage

Adapter Voltage (V)

Constant Charging Current (mA)

4.5 5 5.5 6 6.54.75 5.25 5.75 6.25

2.86

2.87

2.88

2.89

2.90

2.91

2.92

2.93

2.94

Recharge Voltage Threshold vs. Temperature

(VADP = 5V; RSET = 56.7kΩ)

Temperature (°

Battery Voltage (V)

-40 10-15 35 60 85

4.08

4.10

4.12

4.14

4.16

Adapter Charging Current

vs. Output Current

(VADP = 5V; VBAT = 3.6V; VENO = VENBAT = 0V)

Output Current (A)

Adapter Current (A)

0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8

0.0

0.2

0.4

0.6

0.8

1.0

1.2

1.4

1.6

1.8

2.0

IADP

IBAT

AAT3673

DATA SHEET

1.6A Dynamic Battery Charger and Power Manager

Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com

201881B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • April 25, 2012

Typical Characteristics

ADP Charge Current

(500mA Charging Setting)

Time

ADP Voltage

(top) (V)

ADP Charge Current (middle)

ADP Peripheral Current (bottom)

(0.5A/div)

500mA

4.5

ADP Charge Current

(1A Charging Setting)

Time

ADP Voltage

(top) (V)

ADP Charge Current (middle)

ADP Peripheral Current (bottom)

(0.5A/div)

4.5

Over-Voltage Trip Voltage

vs. Temperature

Temperature (°

Adapter Voltage (V)

6.70

6.71

6.72

6.73

6.74

6.75

6.76

6.77

6.78

6.79

6.80

-25 15 55-5 35 75-15 25 6554585

Over-Voltage Trip Voltage

Accuracy vs. Temperature

Temperature (°

Accuracy (%)

-25 15 55-5 35 75-15 25 6554585

-0.50

-0.40

-0.30

-0.20

-0.10

0.00

0.10

0.20

0.30

0.40

0.50

CT Pin Capacitance vs. Counter Timeout

Time (hours)

Capacitance (μF)

01234 567

0.00

0.10

0.20

0.30

0.40

0.50

0.60

0.70

0.80

0.90

1.00

Full Charge

Trickle Charge

LDO Dropout Voltage vs. Load Current

Load Current (A)

VDO (mV)

0 200 400 600 800 1000

100

150

200

250

300

350

400

450

85°C

25°C

-40°C

AAT3673

DATA SHEET

1.6A Dynamic Battery Charger and Power Manager

Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com

201881B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • April 25, 2012

Typical Characteristics

LDO Output Voltage Noise

(IOUT = 10mA, Power BW: 100Hz to 300KHz)

Frequency (Hz)

Noise (μVRMS)

100 1000 10000 100000 1000000

100

200

300

400

500

600

LDO Power Supply Rejection Ratio, PSRR

(VADP = 5V, IOUT = 10mA, BW: 50Hz to 300KHz)

Frequency (Hz)

Magnitude (dB)

100 1000 10000 100000

BAT to OUT RDS(ON) vs. Battery Voltage

VBAT (V)

BAT to OUT RDS(ON) (mΩ)

3 3.2 3.4 3.6 3.83.1 3.3 3.5 3.7 43.9 4.1 4.2

100

85°C

25°C

-25°C

ADP to BYP RDS(ON) vs. Battery Voltage

VBAT (V)

RDS(ON) (mΩ)

4.75 5.25 5.75 6.254.5 5 5.5 6 6.5

100

150

200

250

300

350

85°C

25°C

-25°C

BAT to OUT RDS(ON) vs. Temperature

Temperature (°C)

BAT to OUT RDS(ON) (mΩ)

-25 -5 15 35 55-15 5 25 45 7565 85

ADP to BYP RDS(ON) vs. Temperature

Temperature (°C)

ADP to Bypass RDS(ON) (mΩ)

-25 -5 15 35 55-15 5 25 45 7565 85

100

150

200

250

300

350

AAT3673

DATA SHEET

1.6A Dynamic Battery Charger and Power Manager

Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com

201881B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • April 25, 2012

Typical Characteristics

High Temperature Threshold

(VADP = 5V)

Temperature (°

High Temperature

Threshold, TS1 (%)

28.5

29.5

30.5

31.5

-25 -5 15 35 55 75-15 5 25 45 65 85

Low Temperature Threshold

(VADP = 5V)

Temperature (°

Low Temperature

Threshold, TS2 (%)

58.5

59.5

60.5

61.5

-25 -5 15 35 55 75-15 5 25 45 65 85

Input High Threshold vs. Adapter Voltage

VADP (V)

VEN1(H); VEN2(H); VENO(H); VENBAT(H) (V)

5 5.25 5.75 6.56.2565.54.754.5

0.6

0.7

0.8

0.9

1.0

1.1

1.2

1.3

1.4

-25°C

25°C

85°C

Input Low Threshold vs. Adapter Voltage

0.6

0.7

0.8

0.9

1.0

1.1

1.2

1.3

1.4

-25°C

25°C

85°C

5 5.25 5.75 6.56.2565.54.754.5

VEN1(L); VEN2(L); VENO(L); VENBAT(L) (V)

ADP to OUT RDS(ON) vs. Temperature

Temperature (°C)

ADP to OUT RDS(ON) (mΩ)

-25 -5 15 35 55-15 5 25 45 7565 85

100

200

300

400

500

600

OVP Switch Turn-On Time

(VADP = 6.75V

→

5V; VOVPT = 6.75V; ICH = 1A)

Time (100μs/div)

VADP, VBYP (2V/div)

ICH (A)

-4

-2

0.5

1.5

2.5

3.5

VADP

VBYP

ICH

AAT3673

DATA SHEET

1.6A Dynamic Battery Charger and Power Manager

Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com

201881B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • April 25, 2012

Typical Characteristics

OVP Event Transient

(VADP = 6.3V

→

8V; VOVPT = 6.75V; ICH_CC = 1A)

Time (1μs/div)

VADP, VBYP (2V/div)

ICH (A)

-4

-2

0.5

1.5

2.5

3.5

VADP

VBYP

ICH

OVP Event Transient

(VADP = 6.3V

→

8V; VOVPT = 6.75V; ICH_CC = 1A)

Time (5μs/div)

VADP, VBYP (2V/div)

ICH (A)

-4

-2

0.5

1.5

2.5

3.5

VADP

VBYP

ICH

Response of Out when Switching from VBAT to VADP

(VADP = 0V → 5V; VBAT = 3.6V; RLOAD = 50Ω;

ENBAT = 0V; ENO = 0V; COUT = 10μF)

Time (100μs/div)

VADP, VOUT, VBAT (2V/div)

3.4

3.5

3.6

3.7

3.8

3.9

4.1

4.2

VADP

VOUT

VBAT

Response of Out when Switching from VADP to VBAT

(VADP = 5V → 0V; VBAT = 3.6V; RLOAD = 50Ω;

ENBAT = 0V; ENO = 0V; COUT = 10μF)

Time (200μs/div)

VADP, VOUT, VBAT (2V/div)

3.4

3.5

3.6

3.7

3.8

3.9

4.1

4.2

VADP

VOUT

VBAT

Response of Out when Switching from VBAT to VADP

(VADP = 0V→ 5V; VBAT = 3.6V; RLOAD = 50Ω;

ENBAT = 5V; ENO = 0V; COUT = 10μF)

Time (200μs/div)

VADP, VBAT, VOUT (2V/div)

3.4

3.5

3.6

3.7

3.8

3.9

4.1

4.2

VADP

VOUT

VBAT

Response of Out when Switching from VADP to VBAT

(VADP = 5V → 0V; VBAT = 3.6V; RLOAD = 50Ω;

ENBAT = 5V; ENO = 0V; COUT = 10μF)

Time (1ms/div)

VADP, VOUT, VBAT (2V/div)

3.4

3.5

3.6

3.7

3.8

3.9

4.1

4.2

VADP

VOUT

VBAT

AAT3673

DATA SHEET

1.6A Dynamic Battery Charger and Power Manager

Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com

201881B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • April 25, 2012

Typical Characteristics

Response of Out when ENO = 5V

(VADP = 0V → 5V; VBAT = 3.6V; RLOAD = 50Ω;

ENBAT = 0V; COUT = 10μF)

Time (1ms/div)

VADP, VOUT, VBAT (2V/div)

3.4

3.5

3.6

3.7

3.8

3.9

4.1

4.2

VADP

VOUT

VBAT

Response of Out when ENO = 5V

(VADP = 5V → 0V; VBAT = 3.6V; RLOAD = 50Ω;

ENBAT = 0V; COUT = 10μF)

Time (1ms/div)

VADP, VOUT, VBAT (2V/div)

3.4

3.5

3.6

3.7

3.8

3.9

4.1

4.2

VADP

VOUT

VBAT

Response of Out when Inserting Battery

(VBAT = 0V → 3.6V; VADP = 5V; RLOAD = 50Ω;

ENBAT = 0V; ENO = 0V; COUT = 10μF)

Time (200μs/div)

VADP, VOUT, VBAT (2V/div)

VADP

VOUT

VBAT

Response of Out when Removing Battery

(VBAT = 4.1V → 0V; VADP = 5V; RLOAD = 50Ω;

ENBAT = 0V; ENO = 5V;

COUT = 10μF

)

Time (500μs/div)

VADP, VOUT, VBAT (2V/div)

VADP

VOUT

VBAT

Response of Out when Inserting Battery

(VBAT = 0V → 3.6V; RLOAD = 50Ω; VADP = 5V;

ENBAT = 5V; ENO = 0V;

COUT = 10μF

)

Time (200μs/div)

VADP, VOUT, VBAT (2V/div)

VADP

VOUT

VBAT

Response of Out when Removing Battery

(VBAT = 4.1V → 0V; VADP = 5V; RLOAD = 50Ω;

ENBAT = 5V; ENO = 0V; COUT = 10μF)

Time (500μs/div)

VADP, VOUT, VBAT (2V/div)

VADP

VOUT

VBAT

AAT3673

DATA SHEET

1.6A Dynamic Battery Charger and Power Manager

Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com

201881B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • April 25, 2012

Functional Block Diagram

Charge

System

Control

Thermal and

Current Sense

Ref.

Voltage

Sense

ENO

ADP to BAT

Switch

CHRADP

ADP

ADPSET

EN/EN1

ADP to OUT Switch

BAT to OUT

Switch

STAT1

STAT2/EN2

TERM

ENBAT

OVP

Sense

And

Control

BYP

OUT

BAT

GND

Functional Description

The AAT3673 is a single input dynamic battery charger

and power control IC. The input power control is designed

to be compatible with either AC power adapter or USB

port power sources. In addition, this device also provides

dynamic power control to charge a single cell Li-ion bat-

tery and power a system load simultaneously. The OUT

pin provides regulated 4.4V when input requirement is

met. If the input voltage is not sufficiently high to ensure

regulated OUT, the output will track input assuming the

drop through the switch ADP to BAT or BAT to OUT.

The device contains a charge regulation pass devices to

control the charge current or voltage from the adapter

input power to the battery, it also contains two addi-

tional load switches to control and route input power to

supply the system load and manage power from the bat-

tery to the system load. This charge control and switch

array permits dynamic charging of the battery cell and

control of power to the system load simultaneously.

When an input power source is applied to the AAT3673,

the adapter input will provide power to the system load

and charge the battery. Without a valid supply present

on the ADP pin, the battery will power the system load

as long as the battery voltage is greater than 2.9V. The

internal battery voltage sense circuit will disconnect the

battery from the load if the cell voltage falls below 2.9V

to protect the battery cell from over-discharge which

results in shorter battery life.

The system load current drawn from the battery is lim-

ited internally. The AAT3673 precisely regulates battery

charge current and voltage for 4.2V Li-ion battery cells.

The battery charge current can be programmed up to

1.6A. During battery charge, the AAT3673 pre-conditions

(trickle charges) the battery with a lower current when

the battery voltage is less than 2.9V. The system then

charges the battery in a constant current fast charge

mode when the battery voltage is above 2.9V. When the

battery voltage rises to 4.2V, the charger will automati-

cally switch to a constant voltage mode until the charge

current is reduced to the programmed charge termina-

tion current threshold.

AAT3673

DATA SHEET

1.6A Dynamic Battery Charger and Power Manager

Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com

201881B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • April 25, 2012

The internal arrangement of load switches and the charge

regulation device provide dynamic power sourcing to the

system load. If the system load exceeds the input current

supply from the input source, additional current can be

supplied from the battery cell. At all times, the device will

manage distribution of power between the source, the

battery and the system simultaneously in order to sup-

port system power needs and charge the battery cell with

the maximum amount of current possible. The AAT3673

has a unique internal charge current reduction control

loop that will prevent an input source from overload. In

the case of USB charging from a USB port VUSB supply,

there are two events which need to be guarded against.

The first is charging from a defective or inadequate USB

host supply; the second problem could arise if the pro-

grammed charge current plus the system supply demand

through the AAT3673 exceeds the ability of a given USB

port. In either case, the AAT3673 charge reduction (CHR)

loop will activate when the input source drops below the

VCHR_TH threshold of 4.5V. The CHR loop will automatically

reduce the charge current to the battery until the supply

voltage recovers to a point above the VCHR_TH threshold.

This unique feature protects the charger, system and

source supply in the event an adapter or power source

does not meet the programmed ADP charging mode cur-

rent demand. The resulting CHR system will permit the

charging of a battery cell with the maximum possible

amount of charge current for any given source.

During battery charging, the device temperature can

rise due to power dissipation within the charge current

control device and the load switches. In some cases, the

power dissipation in the device may cause the junction

temperature to rise up to its thermal shutdown thresh-

old. In the event of an internal over-temperature condi-

tion caused by excessive ambient operating temperature

or an excessive power dissipation condition, the AAT3673

utilizes a digitally controlled thermal loop system that

will reduce the charging current to prevent the device

from entering thermal shutdown. The digital thermal

loop will maintain the maximum possible battery charg-

ing current for the given set of input to output power

dissipation and ambient temperature conditions.

The digital thermal loop control is dynamic in the sense

that it will continue to adjust the battery charging current

as operating conditions change. The digital thermal loop

will reset and resume normal operation when the power

dissipation or over temperature conditions are removed.

Battery temperature and charge state are fully moni-

tored for fault conditions. In the event of an over voltage,

over-current, or over-temperature failure, the device will

automatically shut down, thus protecting the charging

device, control system, and the battery under charge. In

addition to internal charge controller thermal protection,

the AAT3673 also provides a temperature sense feedback

function (TS pin) from the battery to shut down the

device in the event the battery exceeds its own thermal

limit during charging. All fault events are reported to the

user by the simple status LED(s) which is (are) inter-

nally controlled by open drain NMOS switch(es).

Charging Operation

The AAT3673 has four basic modes for the battery

charge cycle: pre-conditioning/trickle charge, constant

current fast charge, constant voltage, and end of charge/

sleep state.

Battery Preconditioning

Before the start of charging, the AAT3673 checks sev-

eral conditions in order to assure a safe charging envi-

ronment. The input supply must be above the minimum

operating voltage, or under-voltage lockout threshold

(VUVLO), for the charging sequence to begin. Also, the cell

temperature, as reported by a thermistor connected to

the TS pin from the battery, must be within the proper

window for safe charging. When these conditions have

been met and a battery is connected to the BAT pin, the

AAT3673 checks the state of the battery by sensing the

cell voltage. If the cell voltage is below the precondition-

ing voltage threshold (VMIN), the AAT3673 begins pre-

conditioning the battery cell with charge current which is

10% of the fast charge current.

AAT3673

DATA SHEET

1.6A Dynamic Battery Charger and Power Manager

Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com

201881B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • April 25, 2012

Fast Charge/Constant Current Charging

Battery cell preconditioning continues until the voltage

measured by the internal sense circuit exceeds the pre-

conditioning voltage threshold (VMIN). At this point, the

AAT3673 begins the fast charge constant current phase.

The fast charge constant current (ICH_CC) level is pro-

grammed by the user via the RADP resistor. The AAT3673

remains in constant current charge mode until the bat-

tery reaches the voltage regulation point, VCO(REG). The

formula for fast charge current as a function of current

setting resistor is:

CH_CC

= K

I_CC_ADP

· 2V

ADP

Alternately, to select the resistor value for a given

charging current use:

ADP

= K

I_CC_ADP

· 2V

CH_CC

where KI_CC_ADP = 29300 (typical).

Constant Voltage Charging

The charge control system transitions to a regulated con-

stant voltage phase from the constant current fast charge

mode when the battery voltage reaches the end of charge

regulation threshold (VCO(REG)). The regulation voltage

level is factory programmed to 4.2V (±1%). The charge

current in the constant voltage mode drops as the bat-

tery cell under charge reaches its maximum capacity.

ICH_CC

Recharge Phase

ICH_ TKL

VUVLO

VMIN

VCO( REG)

VRCH

ICH_ TERM

when

VBAT =

VCO( REG)

ICH_ TERM

when

VBAT =

VCO( REG)

Constant Voltage

Charge Phase Charge Phase (CV)

Constant Current

Charge Phase (CC)

Trickle

ChargeUVLO

Battery Constant VoltageConstant Current

Charge Phase

Termination

Phase

Termination

Phase

ICH_ CC

Figure 1: Current vs. Voltage and Charger Time Profile.

AAT3673

DATA SHEET

1.6A Dynamic Battery Charger and Power Manager

Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com

201881B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • April 25, 2012

Control Inputs Pass Devices

EN ENO ENBAT ADP - OUT ADP - BAT BAT - OUT

1 1 1 OFF OFF OFF

0 1 1 OFF ON OFF

1 0 1 OFF OFF OFF

0 0 1 ON ON OFF

1 1 0 OFF OFF ON

0 1 0 OFF ON ON

1 0 0 OFF OFF ON

0 0 0 ONONON

Table 1: AAT3673-1/-4 and AAT3673-2/-5 Battery and Adapter Dynamic Path Control Table.

Control Inputs Pass Devices

EN1 EN2 ENO ENBAT ADP-OUT ADP-BAT BAT-OUT

1111OFFOFFOFF

0011OFFONOFF

0111OFFONOFF

1011OFFONOFF

1101OFFOFFOFF

0001ONONOFF

0101ONONOFF

1001ONONOFF

1110OFFOFFON

0010OFFONON

0110OFFONON

1010OFFONON

1100OFFOFFON

0000ONONON

0100ONONON

1000ONONON

Table 2: AAT3673-3/-6 Battery and Adapter Dynamic Path Control Table.

End of Charge Cycle Termination

and Recharge Sequence

When the charge current drops to the user programmed

charge termination current at the end of the constant

voltage charging phase, the device terminates charging,

enables the recharge control circuit and enters the sleep

state. The charger will remain in the sleep state until the

battery voltage decreases to a level below the battery

recharge voltage threshold (VRCH). The charge termina-

tion current is programmed via the RTERM resistor which

is connected between the TERM pin and ground. Use the

values listed in Table 3 to set the desired charge termi-

nation current. The programmed charge termination

current will remain at the same set level regardless of

which fast charge ADP, USBH or USBL constant current

mode is selected.

ITERM (mA) RTERM (k)

320 11.0

174 21.0

125 30.9

95 41.2

77 51.1

64 61.9

58 71.5

50 80.6

49 90.9

42 100.0

37 110.0

Table 3: Charge Termination Current

Programming Resistor Values.

AAT3673

DATA SHEET

1.6A Dynamic Battery Charger and Power Manager

Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com

201881B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • April 25, 2012

If the desired end of charge termination current level is

not listed in Table 3, the TERM resistor value may be

calculated by the following equation:

ICH_TERM = KI_TERM · 2V

RTERM

RTERM = KI_TERM · 2V

ICH_TERM

KI_TERM = 2000 (typical)

When the input supply is disconnected, the charger also

automatically enters power-saving sleep mode.

Consuming less than 1A in sleep mode, the AAT3673

minimizes battery drain when not charging. This feature

is particularly useful in applications where the input sup-

ply level may fall below the usable range of the charge

reduction control or under-voltage lockout level. In such

cases where the AAT3673 input voltage drops, the

device will enter the sleep mode and automatically

resume charging once the input supply has recovered

from its fault condition.

Dynamic Current Regulation

There are two possible configurations where the system

load current and charge current are dynamically con-

trolled. In the first case, the ADP-BAT switch and the

BAT-OUT switch are enabled, and the ADP-OUT switch is

disabled. Under this condition, the adapter input current

is set by the RSET resistor (fast charge current setting,

ICH_CC) and is split between the system load (IBAT-OUT) and

the battery charge current (IBAT). The charge current is

dynamically adjusted as the system load varies in order

to maintain the adapter input current.

ICH_CC = IBAT + IBAT-OUT

For example: If RSET = 57.6k, the fast charge current

is set for 1A. For a system load of 0mA, the battery

charge current is 1A. As the system load is increased

the battery charge current is reduced, until the system

load is equal to 1A and the battery charge current is 0A.

Further increases in the system load will result in the

battery supplying the balance of the current; a system

load of 1.2A requires the battery to supply 0.2A.

In the second case, the ADP-BAT switch, the BAT-OUT

switch and the ADP-OUT switch are all enabled. Under

this condition, the adapter input current is limited inter-

nally to 1.6A minimum (ILIM_ADP) and is split between the

system load (IADP-OUT) and the battery charge current

(ICH_CC). The charge current is dynamically adjusted as

the system load varies in order to maintain the adapter

input current at or below the 1.6A minimum.

ILIM_ADP ≥ ICH_CC + IADP-OUT

For example: If RSET = 57.6k, the fast charge current

is set for 1A. For a system load of 0mA, the battery

charge current is 1A and the adapter current is less than

1.6A. As the system load is increased the battery charge

current is 1A, until the system load is equal to 0.6A and

the adapter input current is 1.6A. Increasing the system

load above 0.6A causes the battery charge current to be

reduced, until the system load is equal to 1.6A and the

battery charge current is 0A. Further increases in the

system load will result in the battery supplying the bal-

ance of the current; a system load of 1.8A requires the

battery to supply 0.2A.

Over-Voltage Protection

In normal operation, an N-channel MOSFET acts as a

slew-rate controlled load switch, connecting and discon-

necting the power supply from ADP to BYP. A low resis-

tance MOSFET is used to minimize the voltage drop

between the voltage source and the charger and to

reduce the power dissipation. When the voltage on the

input exceeds the over-voltage trip point of 6.75V, the

device turns off the internal switch which disconnects the

charger from the abnormal input voltage, therefore pre-

venting any damage to the charger. The OVP turn-on and

release delay times for the AAT3673-1/-2/-3 are 150s

and 130s respectively, while in the AAT3673-4/-5/-6

these delay times are extended to 80ms typically. If an

over-voltage condition is applied at the time of the device

enable, then the load switch will remain OFF.

OVP Under-Voltage Lockout (UVLO)

The AAT3673 OVP circuitry has a fixed 3.1V under-

voltage lockout level (UVLO). When the adapter input

voltage is less than the UVLO threshold level, the

MOSFET load switch is turned off. A 100mV of hysteresis

is included to ensure circuit stability.

AAT3673

DATA SHEET

1.6A Dynamic Battery Charger and Power Manager

Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com

201881B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • April 25, 2012

Temperature Sense (TS)

Inside the AAT3673, the internal battery temperature

sensing circuit is comprised of two comparators which

establish a voltage window for safe operation. The

thresholds for the TS operating window are bounded by

the TS1 and TS2 specifications. Referring to the Electrical

Characteristics table in this datasheet, the TS1 threshold

= 30% · VBYP and the TS2 threshold = 60% · VBYP

. If the

use of the TS pin function is not required by the system,

it should be terminated to ground.

0.60 x V

BYP

x V

BYP

Battery Cold Fault

Battery Hot Fault

BYP

AAT3673

Battery

Pack

Figure 2: AAT3673 Battery

Temperature Sensing Circuit.

Charge Safety Timer (CT)

While monitoring the charge cycle, the AAT3673 utilizes a

charge timer to help identify damaged cells and to ensure

that the cell is charged safely. Operation is as follows:

upon initiating a charging cycle, the AAT3673 charges the

cell at 10% of the programmed maximum charge until

VBAT >2.9V. If the cell voltage fails to reach the precondi-

tioning threshold of 2.9V (typ) before the safety timer

expires, the cell is assumed to be damaged and the

charge cycle terminates. If the cell voltage exceeds 2.9V

prior to the expiration of the timer, the charge cycle pro-

ceeds into fast charge. There are two timeout periods: 50

minutes for Trickle Charge mode, and 6 hours for Constant

Current Mode and Constant Voltage mode altogether.

The CT pin is driven by a constant current source and will

provide a linear response to increases in the timing

capacitor value. The timeout is 7 hours (typical) using a

100nF capacitor for CT

. Thus, for a 200nF capacitor it

would be 14 hours, and for a 50nF capacitor it would be

3.5 hours respectively.

For a given target delay time TD (in hours) calculate:

CT = (TD · 100nF)

If the programmable watchdog timer function is not

needed, it can be disabled by terminating the CT pin to

ground. The CT pin should not be left floating or unter-

minated, as this will cause errors in the internal timing

control circuit. The constant current provided to charge

the timing capacitor is very small, and this pin is suscep-

tible to noise and changes in capacitance value. Therefore,

the timing capacitor should be physically located on the

printed circuit board layout as close as possible to the CT

pin. Since the accuracy of the internal timer is dominated

by the capacitance value, a 10% tolerance or better

ceramic capacitor is recommended. Ceramic capacitor

materials, such as X7R and X5R types, are a good choice

for this application.

System Operation Flowchart

AAT3673

DATA SHEET

1.6A Dynamic Battery Charger and Power Manager

Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com

201881B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • April 25, 2012

Switch

UVLO

VADP > VUVLO

Power On

Reset

Fault Condition

Monitor

OV, OT, OC

Battery

Temperature Sense

TS1

< TS < V

TS2

Preconditioning

Test

VMIN > VBAT

Current

Phase Test

VCO(REG) > VBAT

Voltage

Phase Test

ICH_CC > ICH_TERM

Charge

Complete

Recharge Test

VRCH > VBAT?

Sleep

Mode

Thermal

Loop Enable

Thermal Loop

Current Reduction

Device

Temperature

Monitor

TJ > 110°C

Input Voltage

Level Test

VADP < VCHR_TH

Constant Current

Charging Mode

Constant Voltage

Charge Mode

Voltage

Regulation

Enable

Low Current

Conditioning

Charge

Battery

Temperature

Fault

Shutdown

Mode

Charge Timer

(Enable on

Charger reset)

Yes

Charge

Reduction

Mode

Yes

Expire

Set

Enable

Dynamic Charge

VENBAT > VEN

Current

Limit Test

IOUT > ILIM_ADP

IOUT + ICH_CC

> ILIM_BAT?

Connect

ADP to BAT

and OUT

Power

Reduce

Charging

Current to BAT

Yes

YesYes

NoYes

Yes

AAT3673

DATA SHEET

1.6A Dynamic Battery Charger and Power Manager

Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com

201881B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • April 25, 2012

Applications Information

Adapter or USB Port Power Source

In the adapter mode, constant current charge levels up

to 1.6A may be programmed by the user. The ADP input

will operate over a range from 4.0V to 6.5V.

The constant fast charge current for the adapter input

mode is set by the RADP resistor connected between the

ADPSET pin and ground. The battery preconditioning or

trickle charge current is fixed at 10% of the programmed

fast charge constant current level. Refer to Table 4 for

recommended RADP values for a desired constant current

charge level. Please refer to the Battery Charge Status

Indication discussion on page 21 of this datasheet for

further details.

Charge Reduction

Under normal operation, the AAT3673 should be operat-

ed from an adapter power source with a sufficient capac-

ity to supply the desired constant charge current plus

any additional load which may be placed on the source

by the operating system. In the event that the power

source to the ADP pin is unable to provide the pro-

grammed fast charge constant current, or if the system

under charge must also share supply current with other

functions, the AAT3673 will automatically reduce the ADP

fast charge current level to maintain the integrity of the

source supply, power the operating system, and charge

the battery cell with the remaining available current.

The ADP charge reduction system becomes active when

the voltage on the ADP input falls below the ADP charge

reduction threshold (VCHR_TH), which is preset to 4.5V.

Should the input supply drop below the VCHR_TH threshold,

the charge reduction system will reduce the fast charge

current level in a linear fashion until the voltage sensed

on the ADP input recovers to the charge reduction thresh-

old voltage. The ADP charge reduction threshold (VCHR_TH)

may be externally set to a value other than 4.5V by plac-

ing a resistor divider network between the BYP pin and

ground with the center connected to the CHRADP pin. The

ADP charge reduction feature may be disabled by shorting

the CHRADP pin directly to the BYP pin.

The following equation may be used to approximate the

ADP charge reduction threshold above or below 4.5V:

VCHR_TH = 2.0V

(R4/[R4 + R3])

where R4 and R3 « 500k.

800k

VCH_REG= 2.0

BYPBYP

CHRADP

Figure 3: Internal Equivalent Circuit

for the CHRADP Pin.

Adapter Input Charge

Inhibit and Resume

The AAT3673 has an under-voltage lockout (UVLO) and

power on reset feature to protect the charger IC in the

event the voltage on the BYP pin drops below the UVLO

threshold. Under a UVLO condition, the charger will sus-

pend the charging process. When power is applied to the

adapter pin again or the UVLO condition recovers, the

system charge control will asses the state of charge on

the battery cell and will automatically resume charging in

the appropriate mode for the condition of the battery.

Programming Fast Charge Current

The constant current charge level is user programmable

with a set resistor connected between the ADPSET pin

and ground. The accuracy of the constant charge cur-

rent, as well as the preconditioning trickle charge cur-

rent, is dominated by the tolerance of the set resistor

used. For this reason, a 1% tolerance metal film resistor

is recommended for the set resistor function. The con-

stant charge current levels from 100mA to 1.6A may be

set by selecting the appropriate value from Table 4.

Charge current setting formula:

ICH_CC_ADP (typ) = · KII_CC_ADP

VADP

RADP

AAT3673

DATA SHEET

1.6A Dynamic Battery Charger and Power Manager

Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com

201881B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • April 25, 2012

Constant Charge

Current (mA) Set Resistor Value (k)

100 576

200 287

300 191

400 143

500 113

800 69.8

1000 56.2

1600 33.4

Table 4: RADP Values.

Figure 4 shows the relationship of constant charging cur-

rent and set resistor values for the AAT3673.

RADP (kΩ)

Constant Charge Current (mA)

10 100 1000 10000

100

1000

10000

Constant Current

Pre-Conditioning

Figure 4: Constant Charging Current

vs. Set Resistor Values.

For the AAT3673-3/-6, the two enable inputs select

between four possible operating modes: two internally

fixed charging current modes (USB Low =100mA or USB

high = 500mA), an externally programmable charging

current mode, and a shutdown mode. The STAT1 func-

tionality is identical for all three modes and does not

depend on the EN1 and EN2 enable inputs.

EN1 EN2 Operating Mode

0 0 USB Low, 100mA charging current

0 1 USB High, 500mA charging current

Using RADP to program charging

current

1 1 Shutdown mode

Table 5: AAT3673-3/-6 Operating Modes.

Battery Connection (BAT)

A single cell Li-Ion/Polymer battery should be connected

between BAT input and ground.

Battery Charge Status Indication

Charge Status Indicator Outputs

There are six device options, which are described in Table

11 on page 26. All options include recharge sequence

after adapter is inserted. The AAT3673-1/-4 and AAT3673-

2/-5 have two status (STAT1 and STAT2) pins and one

enable pin (EN); the AAT3673-3/-6 has one status pin

(STAT1) and two enable pins (EN1 and EN2)

Charge State STAT1 STAT2

Pre-Charge ON ON

Fast-Charge ON OFF

Charge Complete OFF ON

Charge Disabled, Sleep Mode or

Fault Condition OFF OFF

No Battery (with Charge Enabled) Flash (1Hz,

40% duty)

Flash (1Hz,

40% duty)

Table 6: AAT3673-1/-4 LED Status Indicators.

Charge State STAT1 STAT2

Pre-Charge or Fast-Charge ON OFF

Charge Complete, Charge Dis-

abled, or Sleep Mode OFF OFF

Fault Condition OFF ON

No Battery (with Charge Enabled) Flash (1Hz,

40% duty) OFF

Table 7: AAT3673-2/-5 LED Status Indicators.

Charge State STAT1

Pre-Charge or Fast-Charge ON

Charge Complete, Charge Disabled, Sleep

Mode, or Fault Condition OFF

No Battery (with Charge Enabled) Flash (1Hz,

40% duty)

Table 8: AAT3673-3/-6 LED Status Indicators.

Fault condition can be one of the following:

• Battery over-voltage (OV)

• Battery temperature sense hot or cold

• Battery charge timer time-out

• Chip thermal shutdown

AAT3673

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Status Indicator Display

Simple system charging status states can be displayed

using one LED each in conjunction with the STAT1 and

STAT2 pins of the AAT3673-1/-2/-4/-5 and the STAT1

pin of the AAT3673-3/-6. These pins have simple switch-

es connecting the LED’s cathodes to ground. Refer to

Tables 6, 7, and 8 for LED display definitions. The LED

anodes should be connected to BYP or other system

power that does not exceed 6.5V, depending upon sys-

tem design requirements. The LED should be biased with

as little current as necessary to create reasonable illumi-

nation; therefore, a ballast resistor should be placed

between the LED cathode and the STAT1 and STAT2 pins

of the AAT3673-1/-2/-4/-5 and the STAT1 pin of the

AAT3673-3/-6. A 2mA bias current should be sufficient

to drive most low cost green or red LEDs. It is not rec-

ommended to exceed 8mA when driving an individual

status LED.

The required ballast resistor value can be estimated

using the following formulas:

When connecting to the adapter supply with a red LED:

RB(STAT1,2) = VADP - VFLED

ILED(STAT1,2)

Example:

RB(STAT1,2) = = 1.75kΩ

5.5V - 2.0V

2mA

Red LED forward voltage (VF) is typically 2.0V @ 2mA.

When connecting to the USB supply with a green LED:

RB(STAT1,2) = VUSB - VFLED

ILED(STAT1,2)

Example:

RB(STAT1,2) = = 900Ω

5.0V - 3.2V

2mA

Green LED forward voltage (VF) is typically 3.2V @ 2mA.

Protection Circuitry

Thermal Loop Control

Due to the integrated nature of the linear charging con-

trol pass devices for both the adapter and USB modes,

a special thermal loop control system has been employed

to maximize charging current under all operating condi-

tions.

The thermal management system measures the internal

circuit die temperature and reduces the charge current

when the device exceeds a preset internal temperature

control threshold. Once the thermal loop control becomes

active, the constant charge current is initially reduced by

a factor of 0.44.

The initial thermal loop current can be estimated by the

following equation:

Constant Charging: ITLOOP = ICCADP · 0.44

The thermal loop control re-evaluates the internal die

temperature every three seconds and adjusts the fast

charge current back up in small steps up to the full fast

charge current level or until an equilibrium current is

discovered and maximized for the given ambient tem-

perature condition. In this manner, the thermal loop

controls the system charge level. The AAT3673 will

always provide the highest possible level of constant

current in the fast charge mode for any given ambient

temperature condition.

Programmable Watchdog Timer

The AAT3673 contains a watchdog timing circuit which

operates in all charging modes. Typically a 0.1F ceram-

ic capacitor is connected between the CT pin and ground.

When a 0.1F ceramic capacitor is used, the device will

time a shutdown condition if the trickle charge mode

exceeds 50 minutes. When the device transitions from

the trickle charge to the fast charge constant current

mode and then to the constant voltage mode, the timer

counting is continuous but the timeout value changes

from 50 minutes to 7 hours.

Summary for a 0.1F used for the timing capacitor:

Trickle Charge (TC) time out = 50 minutes

Trickle Charge (TC) + Fast Charge Constant Current (CC)

+ Constant Voltage (CV) mode time out = 7 hours

The CT pin is driven by a constant current source and

will provide a linear response to increases in the timing

capacitor value. Thus, if the timing capacitor were to be

doubled from the nominal 0.1F value, the time out time

of the CC + CV modes would be doubled. The corre-

sponding trickle charge time out time would be the com-

bined CC + CV time divided by 8.

If the programmable watchdog timer function is not

needed it may be disabled by terminating the CT pin to

ground. The CT pin should not be left floating or not

terminated; this will cause errors in the internal timing

control circuit.

AAT3673

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The counter input frequency will be divided by two in the

event of a fault condition. Such fault conditions include

digital thermal loop charge current reduction, battery

charge reduction, and battery current sharing with the

output during the charging cycle. When the fault condition

recovers, the counter will resume the timing function.

The charge timer will automatically reset when the

AAT3673 enable pin is reset or cycled off and on. The

constant current provided to charge the timing capacitor

is very small and this pin is susceptible to noise and

changes in capacitance value. Therefore, the timing

capacitor should be physically located on the printed

circuit board layout as close as possible to the CT pin.

Since the accuracy of the internal timer is determined by

the capacitance value, a 10% tolerance or better ceram-

ic capacitor is recommended. Ceramic capacitor materi-

als such as X7R and X5R type are a good choice for this

application.

Battery Over-Voltage Protection

An over-voltage event is defined as a condition where

the voltage on the BAT pin exceeds the maximum bat-

tery charge voltage and is set by the over-voltage pro-

tection threshold (VBOVP). If an over-voltage condition

occurs, the AAT3673 charge control will shutdown the

device until voltage on the BAT pin drops below the over-

voltage protection threshold (VBOVP). The AAT3673 will

resume normal charging operation once the battery

over-voltage condition is removed.

Over-Temperature Shutdown

The AAT3673 has a thermal protection control circuit

which will shut down charging functions should the inter-

nal die temperature exceed the preset thermal limit

threshold. Thermal shutdown also turns off the switches

from ADP to OUT and BAT to OUT.

Battery Temperature Fault Monitoring

In the event of a battery over- or under-temperature

condition, the charge control will turn off the internal

charge path regulation device and disable the BAT-OUT

dynamic path. After the system recovers from a tem-

perature fault, the device will resume charging opera-

tion. The AAT3673 checks battery temperature before

starting the charge cycle, as well as during all stages of

charging. Typically, batteries employ the use of a nega-

tive temperature coefficient (NTC) thermistor that is

integrated into the battery.

Capacitor Selection

Input Capacitor

A 1F or larger capacitor is typically recommended for

CADP

. CADP should be located as close to the device ADP

pin as practically possible. Ceramic, tantalum, or alumi-

num electrolytic capacitors may be selected for CADP

There is no specific capacitor equivalent series resistance

(ESR) requirement for CADP

. However, for higher current

operation, ceramic capacitors are recommended for CADP

due to their inherent capability over tantalum capacitors

to withstand input current surges from low impedance

sources such as batteries in portable devices.

Typically, 50V rated capacitors are required for most of

the application to prevent any surge voltage. Ceramic

capacitors selected as small as 1206 are available which

can meet these requirements. Other voltage rating

capacitor can also be used for the known input voltage

application.

Charger Output Capacitor

The AAT3673 only requires a 1F ceramic capacitor on

the BAT pin to maintain circuit stability. This value should

be increased to 10F or more if the battery connection is

made any distance from the charger output.

System Power Output Capacitor

For proper load voltage regulation and operational stabil-

ity, a capacitor is required between OUT and GND. The

output capacitor connection to the ground pin should be

made as directly as practically possible for maximum

device performance. Since the regulator has been

designed to function with very low ESR capacitors, a 10F

ceramic capacitor is recommended for best performance.

Printed Circuit Board

Layout Recommendations

For proper thermal management and to take advantage

of the low RDS(ON) of the AAT3673, a few circuit board

layout rules should be followed: IN and BAT should be

routed using wider than normal traces, and GND should

be connected to a ground plane. To maximize package

thermal dissipation and power handling capacity of the

AAT3673 TDFN4x4 package, solder the exposed paddle

of the IC onto the thermal landing of the PCB, where the

thermal landing is connected to the ground plane. If heat

is still an issue, multi-layer boards with dedicated ground

planes are recommended. Also, adding more thermal

vias on the thermal landing would help transfer heat to

the PCB effectively.

AAT3673

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Figure 4: AAT3673-1/-2/-4/-5 Evaluation Figure 5: AAT3673-1/-2/-4/-5 Evaluation

Board Top Layer. Board Bottom Layer.

Figure 6: AAT3673-3/-6 Evaluation Figure 7: AAT3673-3/-6 Evaluation

Board Top Layer. Board Bottom Layer.

AAT3673

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Green LED

OUT

10μF C3

10μF

0.1μF

10K

R6 1.5K

R5 1.5K

R1 R2

ENO

BAT

ENBAT

BYP

5V +5V

BYP

Red LED

STAT2

ADP

GND

BAT 11

ADPSET

ENO

CT 16

CHRADP 12

OUT 15

BYP 3

TERM

ENBAT

STAT1

TS 14

BAT 10

U1 TDFN44-16

AAT3673-1/-2/-4/-5

Figure 8: AAT3673-1/-2/-4/-5 Evaluation Board Schematic.

Green LED

OUT

R5 1.5K

10μF C3

10μF

0.1μF R7

10K

R1 R2

EN1

ENO

BAT

ENBAT

EN2

BYP

5V +5V

BYP

EN2

ADP

GND

BAT 11

ADPSET

ENO

EN1

CT 16

CHRADP 12

OUT 15

BYP 3

TERM

ENBAT

STAT1

TS 14

BAT 10

AAT3673-3/-6

U1 TDFN44-16

Figure 9: AAT3673-3/-6 Evaluation Board Schematic.

AAT3673

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Component Part Number Description Manufacturer

U1 AAT3673-1/-2/-4/-5IXN 1.6A Linear Li-Ion/Polymer Battery Charger in TDFN4x4-16 Package Skyworks

R1 Chip Resistor 57.6k, 1%, 1/4W; 0603

Vishay

R2 Chip Resistor 71.5k, 5%, 1/4W; 0603

R5, R6 Chip Resistor 1.5k, 5%, 1/4W; 0603

R7, R8 Chip Resistor 10k, 5%, 1/4W; 0603

C4 GRM188R61A225KE34 0.1F 10V 10% X5R 0603

C1, C2, C3, C5 GRM21BR71A106KE51L 10F 10V 10% X7R 0805

J1, J2, J3 PRPN401PAEN Conn. Header, 2mm zip Sullins Electronics

D1 LTST-C190GKT Green LED; 0603 Lite-On Inc.

D2 LTST-C190CKT Red LED; 0603

Table 9: AAT3673-1/-2/-4/-5 Evaluation Board Bill of Materials (BOM).

Component Part Number Description Manufacturer

U1 AAT3673-3/-6IXN 1.6A Linear Li-Ion/Polymer Battery Charger in TDFN4x4-16 Package Skyworks

R1 Chip Resistor 57.6k, 1%, 1/4W; 0603

Vishay

R2 Chip Resistor 71.5k, 5%, 1/4W; 0603

R5 Chip Resistor 1.5k, 5%, 1/4W; 0603

R6, R7 Chip Resistor 10k, 5%, 1/4W; 0603

C4 GRM188R61A225KE34 0.1F 10V 10% X5R 0603 Murata

C1, C2, C3, C5 GRM21BR71A106KE51L 10F 10V 10% X7R 0805

J1, J2, J3, J4 PRPN401PAEN Conn. Header, 2mm zip Sullins Electronics

D1 LTST-C190GKT Green LED; 0603 Lite-On Inc.

Table 10: AAT3673-3/-6 Evaluation Board Bill of Materials (BOM).

Product

Constant Voltage

Regulation

(V)

OVP Trip

Point

(V)

OVP Turn On

Delay Time

(s)

Preconditioning

Voltage Threshold

(V)

Number of

Status Pins

Number of

Enable Pins

AAT3673-1 4.2 6.75 130 2.9 2; see Table 6 1; see Table 1

AAT3673-2 4.2 6.75 130 2.9 2; see Table 7 1; see Table 1

AAT3673-3 4.2 6.75 130 2.9 1; see Table 8 2; see Table 2

AAT3673-4 4.2 6.75 80,000 2.9 2; see Table 6 1; see Table 1

AAT3673-5 4.2 6.75 80,000 2.9 2; see Table 7 1; see Table 1

AAT3673-6 4.2 6.75 80,000 2.9 1; see Table 8 2; see Table 2

Table 11: AAT3673 Options.

AAT3673

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Ordering Information

Package Marking1Part Number (Tape and Reel)2

TDFN44-16 9SXYY AAT3673IXN-4.2-1-T1

TDFN44-16 9XXYY AAT3673IXN-4.2-2-T1

TDFN44-16 8SXYY AAT3673IXN-4.2-3-T1

TDFN44-16 AAT3673IXN-4.2-4-T1

TDFN44-16 AAT3673IXN-4.2-5-T1

TDFN44-16 AAT3673IXN-4.2-6-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.

Packaging Information

TDFN44-163

Index Area

(D/2 x E/2)

Detail "A"

Detail "B"

Top View Bottom View

Detail "A"

Side View

Option A:

C0.30 (4x) max

Chamfered corner

Option B:

R0.30 (4x) max

Round corner

Detail "B"

0.16

Pin 1 Indicator

(optional)

0.1 REF

4.00

0.05 2.60

0.05

4.00

0.05

3.30

0.05

0.8

0.05

-0.20

0.05

0.229

0.051

7.5°

0.375

0.125

0.3

0.10

0.45

0.05

0.23

0.05

0.075

1. XYY = assembly and date code.

2. Sample stock is generally held on part numbers listed in BOLD.

3. 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.

AAT3673

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Information in this document is provided in connection with Skyworks Solutions, Inc. (“Skyworks”) products or services. These materials, including the information contained herein, are provided by Skyworks as a

service to its customers and may be used for informational purposes only by the customer. Skyworks assumes no responsibility for errors or omissions in these materials or the information contained herein. Sky-

works may change its documentation, products, services, speciﬁ cations or product descriptions at any time, without notice. Skyworks makes no commitment to update the materials or information and shall have no

responsibility whatsoever for conﬂ icts, incompatibilities, or other difﬁ culties arising from any future changes.

No license, whether express, implied, by estoppel or otherwise, is granted to any intellectual property rights by this document. Skyworks assumes no liability for any materials, products or information provided here-

under, including the sale, distribution, reproduction or use of Skyworks products, information or materials, except as may be provided in Skyworks Terms and Conditions of Sale.

THE MATERIALS, PRODUCTS AND INFORMATION ARE PROVIDED “AS IS” WITHOUT WARRANTY OF ANY KIND, WHETHER EXPRESS, IMPLIED, STATUTORY, OR OTHERWISE, INCLUDING FITNESS FOR A PARTICULAR

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CLUDING BUT NOT LIMITED TO ANY SPECIAL, INDIRECT, INCIDENTAL, STATUTORY, OR CONSEQUENTIAL DAMAGES, INCLUDING WITHOUT LIMITATION, LOST REVENUES OR LOST PROFITS THAT MAY RESULT FROM

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Skyworks products are not intended for use in medical, lifesaving or life-sustaining applications, or other equipment in which the failure of the Skyworks products could lead to personal injury, death, physical or en-

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Customers are responsible for their products and applications using Skyworks products, which may deviate from published speciﬁ cations as a result of design defects, errors, or operation of products outside of pub-

lished parameters or design speciﬁ cations. Customers should include design and operating safeguards to minimize these and other risks. Skyworks assumes no liability for applications assistance, customer product

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