AAT3696IWP-2-T1 - AnalogicTech

AAT3696

1.6A Linear Li-Ion Battery Charger in 3x3 TDFNBatteryManagerTM

PRODUCT DATASHEET

3696.2009.07.1.1 1

www.analogictech.com

General Description

The AAT3696 BatteryManager™ is a single-cell lithium-

ion (Li-Ion)/Li-Polymer battery charger IC designed to

operate from USB ports or AC adapter up to an input

voltage of 6.5V or 6.05V (depending on the option1). For

increased safety, the AAT3696 also includes over-voltage

input protection (OVP) up to 28V.

The AAT3696 precisely regulates battery voltage after it

has reached 4.2V or 4.375V (depending on the option1)

Li-Ion/Polymer battery cells through an extremely low

RDS(ON) switch. The charging current can be set by an

external resistor up to 1.6A. In case an over-voltage

condition occurs from the input, a series switch quickly

opens and a fault flag is activated to prevent damage to

the battery and charging circuitry.

Other fault conditions are monitored in real time. In case

of an over-current, battery over-voltage, short circuit, or

over-temperature failure, the device will automatically

shut down, thus protecting the charging device, control

system, and the battery under charge. A status monitor-

ing output pin (STAT) is provided to indicate charging

activity. This open-drain output pin can be used to drive

an external LED as a charging indicator. The AAT3696

has two charge termination mode selections when the

battery voltage has reached the constant voltage level

VCO(REG) and the charging current has decreased the ter-

mination current level.

The AAT3696 offers a 4.9V/30mA LDO linear regulator.

This regulator is enabled all the time regardless of the

status of the charger and protected by the OVP switch.

The AAT3696 is available in the Pb-free, thermally

enhanced, space-saving 3x3mm TDFN33-12 package and

is rated over the -40°C to +85°C temperature range.

Features

• USB or AC Adapter System Power Charger

• 3.0V ~ 6.5V or 6.05V Input Voltage Range

• 2.8V Typical Under-Voltage Lockout Threshold

• Fast Over-Voltage Protection Turn Off

• Two OVP Turn-On Delay Time Options:

 40s

 80ms

• Two OVP Trip Point Options:

 Protection Trip at 6.75V

 Protection Trip at 6.25V

• High Level of Integration with Internal:

 Power Device

 Reverse Current Blocking

 Current Sensing

• 4.9V/30mA LDO Output Through Over-Voltage

Protection Device

• Programmable Current from 100mA to 1.6A Max

• Charge Status Indicator

• Automatic Recharge Sequencing

• Automatic Trickle Charge For Battery Pre-Conditioning

• Emergency Thermal Shutdown Protection

• Power on Reset and Soft Start

• Active Low Enable with Internal 200k Pull-Down

Resistor

• Two Charge Termination Control Selections:

 Manual: Continuous Battery Charging Until Charge

Termination by Enable Pin

 Automatic: Battery Charging is Terminated with

Transition to Sleep State

• 12-pin 3x3mm TDFN Package

Applications

• Bluetooth™ Headsets, Headphones, Accessories

• Digital Still Cameras

• Mobile Telephones

• MP3 Players

• Personal Data Assistants (PDAs)

1. Please refer to Table 9 on page 19 for complete list of options.

AAT3696

1.6A Linear Li-Ion Battery Charger in 3x3 TDFNBatteryManagerTM

PRODUCT DATASHEET

2 3696.2009.07.1.1

www.analogictech.com

AAT3696

1.6A Linear Li-Ion Battery Charger in 3x3 TDFNBatteryManagerTM

PRODUCT DATASHEET

2 3696.2009.07.1.1

www.analogictech.com

Typical Application

BATT-

VADP

Battery

Pack

BATT+

STAT

GND

BAT

LDOOUT

RSET

ISET

OVPFLG

LDOOUT

System

INCHR

BATS

1μF

10μF

2.2μF

10kΩ

2.2μF

ON/OFF EN

MODE

AAT3696

Pin Descriptions

Pin # Name Type Function

1 INCHR I/O Output of over-voltage protection (OVP) stage and input to battery charger. Decouple to GND

with 2.2F capacitor.

2 IN I Input from USB port or AC adapter.

3 LDOOUT O 4.9V/30mA LDO output through OVP device. Bypass to GND with 2.2F capacitor.

4OVPFLG O Over-voltage fault ﬂ ag, open drain, active low.

5STAT O Charge status indicator pin, open drain, active low.

6 MODE I

MODE selection pin (internal connect with a 200k pull-up resistor to INCHR). Factory default

at 10% termination current if MODE is open or connect to INCHR. Continues to charge if

MODE is connect to GND.

7 GND I/O Power ground.

8 EN I Active low enable pin (internal connect with a 200k pull-down resistor).

9 ISET I Connect RSET resistor here to set adaptor or USB charging current.

10 IC I Internally connected through 100k resistor to GND. Leave this pin open.

11 BATS I Battery voltage remote sense input.

12 BAT O Connect to Li-Ion battery.

Exposed paddle (bottom); The exposed thermal pad (EP) should be connected to board

ground plane and pin 7. The ground plane should include a large exposed copper pad under

the package for thermal dissipation (see package outline).

Pin Configuration

TDFN33-12

(Top View)

INCHR

LDOOUT

OVPFLG

STAT

MODE

BAT

BATS

ISET

GND

AAT3696

1.6A Linear Li-Ion Battery Charger in 3x3 TDFNBatteryManagerTM

PRODUCT DATASHEET

3696.2009.07.1.1 3

www.analogictech.com

AAT3696

1.6A Linear Li-Ion Battery Charger in 3x3 TDFNBatteryManagerTM

PRODUCT DATASHEET

3696.2009.07.1.1 3

www.analogictech.com

Absolute Maximum Ratings1

Symbol Description Value Units

VIN IN continuous -0.3 to 30 V

VPINCHR, EN, STAT, OVPFLG, MODE -0.3 to 7.5 V

VNBAT, BATS, LDOOUT, ISET, IC -0.3 to VP + 0.3 V

TJJunction Temperature Range -40 to 150 °C

TAOperating Temperature Range -40 to 85 °C

TLEAD Maximum Soldering Temperature (at Leads) 300 °C

Thermal Information2

Symbol Description Value Units

θJA Maximum Thermal Resistance (TDFN33-12) 50 °C/W

PDMaximum Power Dissipation 2 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. Mounted on an FR4 board.

AAT3696

1.6A Linear Li-Ion Battery Charger in 3x3 TDFNBatteryManagerTM

PRODUCT DATASHEET

4 3696.2009.07.1.1

www.analogictech.com

AAT3696

1.6A Linear Li-Ion Battery Charger in 3x3 TDFNBatteryManagerTM

PRODUCT DATASHEET

4 3696.2009.07.1.1

www.analogictech.com

Electrical Characteristics1

VIN = 5V, TA = -40 to +85°C, RSET = 3.16k, VMODE = 0V, BAT = BATS, unless otherwise noted. Typical values are at TA

= 25°C

Symbol Description Conditions Min Typ Max Units

Operation

VIN_MAX Input Over-Voltage Protection Range 28 V

VIN Normal Operating Input Voltage Range2, 3 Refer to Table 4 3.0 6.5 V

Refer to Table 4 3.0 6.05

IOP Operating Current RSET = 15.8 k, VEN = 0V, VIN = 5V 0.5 0.6 mA

ISD

Charge Function Shutdown Supply

Current (OVP function still active) VIN =VEN = 5.5V 160 220 A

IBAT Leakage Current from BAT Pin VBAT = 4V, IN Pin Open 0 1 A

Over-Voltage Protection

VOVPT

Over-Voltage Protection Trip Point2, 3 VIN Rising Edge; Refer to Table 4 6.5 6.75 7.0 V

VIN Rising Edge; Refer to Table 4 6.05 6.25 6.45

Hysteresis 100 mV

VDO_OVP

Dropout Voltage between IN and INCHR

Pins VIN = 5V, ILOAD@BAT = 1000mA, RSET = 1k 200 mV

Battery Charger

VUVLO

Under-Voltage Lockout Threshold VIN Rising edge 2.5 2.8 3.0 V

UVLO Hysteresis 150 mV

VDO_CHARGE

Dropout Voltage between INCHR and BAT

Pins VIN = 4.2V, ILOAD@BAT = 1000mA, RSET = 1k200 mV

VBOVP Battery Over-Voltage Protection Threshold 4.4 V

Voltage Regulation

VCO (REG) Constant Output Voltage2, 3 Refer to Table 4 4.20 V

Refer to Table 4 4.375

ΔVCO/VCO Constant Output Voltage Tolerance TA = 25°C -0.5 +0.5 %

TA = -40°C to +85°C -1 +1 %

VRCH Battery Recharge Voltage Threshold MODE = High VCO(REG)

- 0.1 V

VMIN Preconditioning Voltage Threshold2, 3 Refer to Table 4 2.4 2.6 2.8 V

Refer to Table 4 2 2.2 2.4

Current Regulation

ICC_RANGE Charge Current Programmable Range 100 1600 mA

ICH_CC Constant-Current Mode Charge Current

RSET = 15.8k, VBAT = 3.6V -15% 110 +15% mA

RSET = 3.16k, VBAT = 3.6V -10% 500 +10% mA

RSET = 1.58k, VBAT = 3.6V -10% 1000 +10% mA

RSET = 1k, VBAT = 3.6V -15% 1500 +15% mA

VISET ISET Pin Voltage TA = 25°C 1.98 2 2.02 V

TA = -40°C to +85°C 1.9 2 2.1

KIISET Charge Current Set Factor: ICH_CC/IISET VBAT = 3.6V 790

ICH_TRK Trickle Charge Current VBAT = 2.3V 12 %

ICH_CC

ICH_TERM Charge Termination Threshold Current 10 %

ICH_CC

1. The AAT3696 is guaranteed to meet performance specifications over the -40°C to +85°C operating temperature range and is assured by design, characterization and correla-

tion with statistical process controls.

2. Only options -1, -2, -5, and -6 are available.

3. Please refer to Table 9 on page 19 for complete list of options.

AAT3696

1.6A Linear Li-Ion Battery Charger in 3x3 TDFNBatteryManagerTM

PRODUCT DATASHEET

3696.2009.07.1.1 5

www.analogictech.com

AAT3696

1.6A Linear Li-Ion Battery Charger in 3x3 TDFNBatteryManagerTM

PRODUCT DATASHEET

3696.2009.07.1.1 5

www.analogictech.com

Electrical Characteristics1

VIN = 5V, TA = -40 to +85°C, RISET = 3.16k, VMODE = 0V, BAT = BATS, unless otherwise noted. Typical values are at TA

= 25°C

Symbol Description Conditions Min Typ Max Units

Logic Control / Battery Protection

VEN(H), VMODE(H) Input High Threshold VIN = 5V 1.2 V

VEN(L), VMODE(L) Input Low Threshold 0.4 V

VSTAT Output Low Voltage STAT pin sinks 4mA 0.4 V

ISTAT STAT Pin Current Sink Capability 8mA

VOVPFLG Output Low Voltage OVPFLG pin sinks 4mA 0.4 V

IOVPFLG OVPFLG Pin Current Sink Capability 8mA

TDLY_OVPFLG

OVPFLG Assertion Delay Time from Over-

Voltage

From assertion of over-voltage

condition (OV) 1s

TRESPOV Over-Voltage Protection Response Time VIN voltage step up from 6V to 8V,

RLOAD = 100, CINCHR = 1F 0.5 s

TOVPR OVP Switch Turn-On Rise Time RLOAD = 100, CINCHR = 1F 100 s

TSHDN Chip Thermal Shutdown Temperature Threshold 140 ºC

Hysteresis 15

Options -1, -3, -5, -7, -9, -11, -13, -15

TRELDLY_OVPFLG_40sOVPFLG Release Delay Time From release of over-voltage

condition (OV) 1.5 s

TOVPON_40sOVP Switch OVP Release Delay Time VIN voltage step down from 8V to

6V, RLOAD = 100, CINCHR = 1F40 s

TOVPSTARTON_40sOVP Switch Start Up Delay Time VIN voltage step up from 0V to 5V,

RLOAD = 100, CINCHR = 1F150 250 s

Options -2, -4, -6, -8 , -10, -12, -14, -16

TRELDLY_OVPFLG_80ms OVPFLG Release Delay Time From release of over-voltage

condition (OV) 80 ms

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

6V, RLOAD = 100, CINCHR = 1F80 ms

TOVPSTARTON_80ms OVP Switch Start Up Delay Time VIN voltage step up from 0V to 5V,

RLOAD = 100, CINCHR = 1F80 ms

Low Dropout Regulator (LDO)

VOUT LDO Output Voltage Tolerance

ILDOOUT = 1mA to

30mA, VIN = 5.1V

TA = 25°C 4.802 4.9 4.998

TA = -40°C

to 85°C 4.729 4.9 5.071

VIN = 5V, ILDOOUT = 50mA 4.4

VDO LDO Dropout Voltage ILDOOUT = 30mA, VIN =4.9V 200 300 mV

ILIM LDO Current Limit VOUT = 0V 75 mA

ΔVOUT/VOUT*ΔVIN LDO Line Regulation VIN = 5V to 6V or 5.4V to 6.4V,

ILDOOUT = 10mA 0.09 %/V

ΔVOUT(Line) LDO Dynamic Line Regulation ILDOOUT = 30mA, VIN = 5V to 6V or

5.4V to 6.4V, TR/TF = 2s25 mV

ΔVOUT(Load) LDO Dynamic Load Regulation ILDOOUT = 1mA to 30mA, TR <5s;

VIN = VOUT(NOM) +1V 60 mV

1. The AAT3696 is guaranteed to meet performance specifications over the -40°C to +85°C operating temperature range and is assured by design, characterization and correla-

tion with statistical process controls.

AAT3696

1.6A Linear Li-Ion Battery Charger in 3x3 TDFNBatteryManagerTM

PRODUCT DATASHEET

6 3696.2009.07.1.1

www.analogictech.com

AAT3696

1.6A Linear Li-Ion Battery Charger in 3x3 TDFNBatteryManagerTM

PRODUCT DATASHEET

6 3696.2009.07.1.1

www.analogictech.com

Typical Characteristics−Battery Charger

Constant Charging Current vs.

Set Resistor Values

RSET (KΩ

)

Constant Charging Current (mA)

100

1000

10000

1100.1 100

Operating Current vs. Set Resistor Values

RSET (KΩ

)

Operating Current (µA)

1100.1 100

300

600

900

1200

1500

1800

2100

2400

Constant Current Mode

Preconditioning Mode

Constant Charging Current vs. Battery Voltage

Battery Voltage (V)

Constant Charging Current (mA)

2.7 2.92.5 3.1 3.3 3.5 3.7 3.9 4.1 4.3

200

400

600

800

1000

1200 RSET = 1.58KΩ

RSET = 1.96KΩ

RSET = 2.67KΩ

RSET = 3.92KΩ

RSET = 7.87KΩ

Constant Charging Current vs. Temperature

(RSET = 1.58KΩ)

Temperature (°C)

Constant Charging Current (mA)

-15 10-40 35 60 85

990

994

998

1002

1006

1010

Constant Charging Current vs. Input Voltage

(RSET =1.58KΩ)

Input Voltage (V)

Constant Charging Current (mA)

4.5 5.04.0 5.5 6.0 6.5

700

750

800

850

900

950

1000

1050

VBAT = 3.3V

VBAT = 3.6V

VBAT = 3.9V

VBAT = 4.1V

Constant Charging Current vs. Input Voltage

(RSET = 3.16KΩ)

Input Voltage (V)

Constant Charging Current (mA)

4.5 5.04.0 5.5 6.0 6.5

400

420

440

460

480

500

520

540

560

580

VBAT = 3.3V

VBAT = 3.6V

VBAT = 3.9V

VBAT = 4.1V

AAT3696

1.6A Linear Li-Ion Battery Charger in 3x3 TDFNBatteryManagerTM

PRODUCT DATASHEET

3696.2009.07.1.1 7

www.analogictech.com

AAT3696

1.6A Linear Li-Ion Battery Charger in 3x3 TDFNBatteryManagerTM

PRODUCT DATASHEET

3696.2009.07.1.1 7

www.analogictech.com

Typical Characteristics−Battery Charger

Preconditioning Voltage Threshold

vs. Temperature

(RSET = 1.58KΩ)

Temperature (°C)

Preconditioning Voltage

Threshold (V)

-15 10-40 35 60 85

2.55

2.56

2.57

2.58

2.59

2.60

2.61

2.62

2.63

Preconditioning Charge Current

vs. Temperature

(RSET = 1.58KΩ; ICH_CC = 1000mA)

Temperature (°C)

Preconditioning Charge

Current (mA)

-15 10-40 35 60 85

100

105

110

115

120

Constant Output Voltage vs. Temperature

(RSET = 1.58KΩ)

Temperature (°C)

Constant Output Voltage (V)

-15 10-40 35 60 85

4.180

4.185

4.190

4.195

4.200

4.205

4.210

4.215

4.220

Constant Output Voltage vs. Input Voltage

(RSET =1.58KΩ)

Input Voltage (V)

Constant Output Voltage V)

5.3 5.65.0 5.9 6.2 6.5

4.190

4.192

4.194

4.196

4.198

4.200

4.202

4.204

4.206

4.208

4.210

Enable Input Low Voltage vs. Input Voltage

Input Voltage (V)

Enable Low Voltage (V)

4.5 5.04.0 5.5 6.0 6.5

0.60

0.63

0.66

0.69

0.72

0.75

0.78

0.81

0.84

85°C

25°C

-40°C

Enable Input High Voltage vs. Input Voltage

Input Voltage (V)

Enable High Voltage (V)

4.5 5.04.0 5.5 6.0 6.5

0.890

0.891

0.892

0.893

0.894

0.895

0.896

0.897

0.898

0.899

0.900

85°C

25°C

-40°C

AAT3696

1.6A Linear Li-Ion Battery Charger in 3x3 TDFNBatteryManagerTM

PRODUCT DATASHEET

8 3696.2009.07.1.1

www.analogictech.com

AAT3696

1.6A Linear Li-Ion Battery Charger in 3x3 TDFNBatteryManagerTM

PRODUCT DATASHEET

8 3696.2009.07.1.1

www.analogictech.com

Typical Characteristics−OVP

OVPFLG Assertion Delay Time

(RLOAD = 100Ω, OVP Trip Point 6.75V)

Time (1µs/div)

Input Voltage

(top) (V)

OVPFLG Voltage

(bottom) (V)

OVPFLG Assertion Delay Time

(RLOAD = 100Ω, OVP Trip Point 6.25V)

Time (1µs/div)

Input Voltage

(top) (V)

OVPFLG Voltage

(bottom) (V)

OVPFLG Release Delay Time

(RLOAD = 100Ω, OVP Trip Point 6.75V)

Time (50µs/div)

Input Voltage

(top) (V)

OVPFLG Voltage

(bottom) (V)

OVPFLG Release Delay Time

(RLOAD = 100Ω, OVP Trip Point 6.25V)

Time (50µs/div)

Input Voltage

(top) (V)

OVPFLG Voltage

(bottom) (V)

OVP Switch Release Delay Time

(RLOAD = 100Ω, All 40µs Delay Options)

Time (10µs/div)

Input Voltage

(top) (V)

INCHR Voltage

(bottom) (V)

-2

OVP Switch Release Delay Time

(RLOAD = 100Ω, All 80ms Delay Options)

Time (50ms/div)

Input Voltage

(top) (V)

INCHR Voltage

(bottom) (V)

AAT3696

1.6A Linear Li-Ion Battery Charger in 3x3 TDFNBatteryManagerTM

PRODUCT DATASHEET

3696.2009.07.1.1 9

www.analogictech.com

AAT3696

1.6A Linear Li-Ion Battery Charger in 3x3 TDFNBatteryManagerTM

PRODUCT DATASHEET

3696.2009.07.1.1 9

www.analogictech.com

Typical Characteristics−OVP

Over-Voltage Protection Response Time

(RLOAD = 100Ω, All 80ms Delay Options)

Time (50ms/div)

Input Voltage

(top) (V)

INCHR Voltage

(bottom) (V)

Over-Voltage Protection Response Time

(RLOAD = 100Ω, All 40µs Delay Options)

Time (10µs/div)

Input Voltage

(top) (V)

INCHR Voltage

(bottom) (V)

OVP Trip Point vs. Temperature

Temperature (°C)

OVP Trip Point (V)

-15 10-40 35 60 85

6.00

6.20

6.40

6.60

6.80

7.00

3696-1, -2

3696-5, -6

Battery Recharge Voltage Threshold

vs. Temperature

(RSET = 1.58KΩ)

Temperature (°C)

Battery Recharge

Voltage Threshold (V)

-15 10-40 35 60 85

4.070

4.075

4.080

4.085

4.090

4.095

4.100

4.105

4.110

AAT3696

1.6A Linear Li-Ion Battery Charger in 3x3 TDFNBatteryManagerTM

PRODUCT DATASHEET

10 3696.2009.07.1.1

www.analogictech.com

AAT3696

1.6A Linear Li-Ion Battery Charger in 3x3 TDFNBatteryManagerTM

PRODUCT DATASHEET

10 3696.2009.07.1.1

www.analogictech.com

Typical Characteristics−LDO

LDO Output Voltage Accuracy vs. Input Voltage

(ILDOOUT = 10mA)

Input Voltage (V)

Output Voltage Accuracy (%)

5.3 5.55.1 5.7 5.9 6.1 6.3 6.5

-0.20

-0.15

-0.10

-0.05

0.00

0.05

0.10

0.15

0.20

85°C

25°C

-40°C

LDO Output Voltage Accuracy vs. Input Voltage

(ILDOOUT = 30mA)

Input Voltage (V)

Output Voltage Accuracy (%)

5.3 5.55.1 5.7 5.9 6.1 6.3 6.5

-0.4

-0.3

-0.2

-0.1

0.1

0.2

0.3

0.4

85°C

25°C

-40°C

LDO Output Voltage Accuracy vs. Temperature

(ILDOOUT = 10mA)

Temperature (°C)

Output Voltage Accuracy (%)

-15 10-40 35 60 85

-1.000

-0.800

-0.600

-0.400

-0.200

0.000

0.200

0.400

0.600

0.800

1.000

LDO Output Voltage Accuracy vs. Temperature

(ILDOOUT = 30mA)

Temperature (°C)

Output Voltage Accuracy (%)

-15 10-40 35 60 85

-1.0

-0.8

-0.6

-0.4

-0.2

0.0

0.2

0.4

0.6

0.8

1.0

LDO Output Voltage vs. Temperature

(ILDOOUT = 10mA)

Temperature (°C)

Output Voltage (V)

-15 10-40 35 60 85

4.800

4.810

4.820

4.830

4.840

4.850

4.860

4.870

4.880

4.890

4.900

LDO Output Voltage Accuracy vs. Output Current

(VIN = 5.1V; VLDOOUT = 4.9V)

Output Current (mA)

Output Voltage Accuracy (%)

51001520253035

-0.7

-0.6

-0.5

-0.4

-0.3

-0.2

-0.1

0.1

85°C

25°C

-40°C

AAT3696

1.6A Linear Li-Ion Battery Charger in 3x3 TDFNBatteryManagerTM

PRODUCT DATASHEET

3696.2009.07.1.1 11

www.analogictech.com

AAT3696

1.6A Linear Li-Ion Battery Charger in 3x3 TDFNBatteryManagerTM

PRODUCT DATASHEET

3696.2009.07.1.1 11

www.analogictech.com

Typical Characteristics−LDO

LDO Load Transient

(VIN = 5.4V; ILDOOUT = 1mA to 30mA; COUT = 1µF)

Time (100µs/div)

Output Current

(top) (mA)

Output Voltage

(bottom) (mV)

-100

-50

100

LDO Load Transient

(VIN = 5.4V; ILDOOUT = 10mA to 30mA; CLDOOUT = 1µF)

Time (100µs/div)

Output Current

(top) (mA)

Output Voltage

(bottom) (mV)

-100

-50

100

LDO Line Transient

(VIN = 5.4V to 6.4V; ILDOOUT = 30mA; CLDOOUT = 1µF)

Time (100µs/div)

Input Voltage

(top) (V)

Output Voltage

(bottom) (V)

4.6

4.7

4.8

4.9

5.1

LDO Dropout Voltage vs. Output Current

Output Current (mA)

LDO Dropout Voltage (mV)

510015202530

100

150

200

250

300

85°C

25°C

-40°C

AAT3696

1.6A Linear Li-Ion Battery Charger in 3x3 TDFNBatteryManagerTM

PRODUCT DATASHEET

12 3696.2009.07.1.1

www.analogictech.com

AAT3696

1.6A Linear Li-Ion Battery Charger in 3x3 TDFNBatteryManagerTM

PRODUCT DATASHEET

12 3696.2009.07.1.1

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Functional Description

The AAT3696 is a high performance battery charger IC

designed to charge single-cell Lithium-Ion or Polymer

batteries with up to 1.6A of current from external power

source. It is a stand alone charging solution requiring

minimum input components. Also included a fast turn-off

over-voltage protection (OVP) circuits with +28V and

this OVP consist of a low resistance P-channel MOSFET

in series with the charge control MOSFET. The AAT3696

also designed with of under-voltage lockout protection,

over-voltage monitor, fast shut-down circuitry with a

fault output flag, and a 4.9V LDO with 30mA output

through the OVP switch.

Battery Charging Operation

Figure 1 illustrates the entire battery charging profile or

operation, which consist of three phases:

1. Preconditioning (Trickle) Charge

2. Constant Current Charge

3. Constant Voltage Charge

4. Automatic Recharge when MODE = High

Preconditioning Charge

Battery charging commences only after the AAT3696

checks several conditions in order to maintain a safe

charging environment. The input supply must be above

the minimum operating voltage, or under-voltage lock-

out threshold (VUVLO) and the enable pin must be low for

the charging sequence to begin. When these conditions

have been met and a battery is connected to the BAT

pin, the AAT3696 checks the state of the battery and

determines which charging mode to apply. If the battery

voltage is below the preconditioning voltage threshold

(VMIN), then the AAT3696 begins preconditioning the cell

(trickle charging) by charging at 10% of the programmed

constant current. For example, if the programmed fast

charge current is 1600mA, then the preconditioning

(trickle charge) current is 160mA. Battery cell precondi-

tioning is a safety precaution for deeply discharged cells

and will also reduce the power dissipation in the internal

series pass transistor when the voltage across the device

is at greatest potential.

Functional Block Diagram

Charge

Control

Current

Compare

Reverse Blocking

Constant

Current

BAT

ISET

UVLO

Over-Temp

Protect

4.9V/30mA

LDO

GND

OVP

Sense and

Control

STAT

CV/

Pre-charge

OVPFLG

LDOOUT

Charge

Status

INCHR

OVP

Switch

BATS

MODE

AAT3696

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PRODUCT DATASHEET

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Constant Current Charge

Battery cell preconditioning charge continues until the

battery voltage reaches the preconditioning voltage

threshold (VMIN). At this point, the AAT3696 begins con-

stant current charge. The current level for this mode is

programmed using a single resistor from the ISET pin to

ground. The programmed current can be set at a mini-

mum 100mA up to a maximum of 1.6A.

Constant Voltage Charge

Constant current charge will continue until the battery

voltage reaches the constant output voltage threshold,

VCO (REG). The AAT3696 will then transition to constant

voltage mode, where the charge IC regulates the battery

voltage at constant output voltage (factory programmed

to 4.2V or 4.375V). The charging current at this phase

will decrease until the charge termination current or

10% of the programmed constant current is reached.

The AAT3696 has two charge termination control selec-

tions which can be set by the MODE pin.

MODE = 0 (Ground or logic low)

The charger regulates battery voltage at 4.2V or 4.375V

optional voltage and continues to charge the battery

with a current lower than the programmed charge ter-

mination current until the AAT3696 is disabled by apply-

ing logic high to the EN pin to stop charging.

MODE = 1 (INCHR or logic high)

The charger turns off the series pass device and auto-

matically goes into a power-saving sleep state. During

this time, a series pass device blocks the current in both

directions, preventing the battery from discharging

through the IC. The AAT3696 will remain in sleep mode

until the battery voltage drops below the VRCH threshold

or the charger is enabled or input power is recycled. The

AAT3696 will resume charging operation if no fault is

detected.

ICH_TRK

ICH_CC

VMIN

Battery Voltage

Battery Current

Charger Turns ON

VRCH

ICH_TERM

Preconditioning Charge Constant Current Charge Constant Voltage Charge

Charger Turns OFF

When MODE = High

VCO(REG)

Battery Recharge

Charger Stays ON

When MODE = Low

Figure 1: Current vs. Voltage Profile during Charging Phases.

AAT3696

1.6A Linear Li-Ion Battery Charger in 3x3 TDFNBatteryManagerTM

PRODUCT DATASHEET

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Charger Operational Flowchart

CH >V

BAT

MIN

BAT

IBAT

> I

MIN

Charge

Completed

Charge

Completed

Yes

ADP

Voltage

ADP > V

ADPP

Recharge Test

VBAT < VRCH

Preconditioning

Test

VMIN > VBAT

Current Phase Test

VCO(REG) > VBAT

Voltage Phase Test

IBAT > ITERM

Charge

Completed

Charge

Completed

Yes

Power Select

Power Input

Voltage

VIN>VUVLO ?

Sleep

Mode

Sleep

Mode

Sleep

Power On

Reset

Shut Down

Mode

Shut Down

Mode

Shut Down

Mode

Preconditioning

(Trickle Charge)

YesYes

Shut Down

Mode

Shut Down

Mode

Shut Down

Mode

Constant Current

Charge Mode

YesYes

YesYes Shut Down

Mode

Shut Down

Mode

Shut Down

Mode

Constant Voltage

Charge Mode

NoNo

Yes

OVP Condition

Monitoring

VIN VOVP

Shut Down

Mode

Shut Down

Mode

Shut Down

Mode

Disconnect Input

from charger

Yes

EN = High ?

Fault Conditions

Monitoring?

BOV, OT

Charge Suspended

IBAT

> I

MIN

Mode = 0 ? Shut Down

Mode

Shut Down

Mode

Shut Down

Mode

Continuously

Charging at

Constant Voltage

Yes

AAT3696

1.6A Linear Li-Ion Battery Charger in 3x3 TDFNBatteryManagerTM

PRODUCT DATASHEET

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Charge Status Output

The AAT3696 provides battery charging status via a sta-

tus pin, STAT. This pin is internally connected to an

N-channel open-drain MOSFET, which can be used as a

logic signal, or drive an external LED. The charge status

indication pin (STAT) pulls high indicating charge com-

pletion or charge termination, regardless of the selection

of the charge termination mode, as long as the charge

termination current is reached.

The status pin indicates the following conditions described

in Table 1:

Charge Status Status

Battery is charging Low

Charging is completed High

When EN is high High

Table 1: LED Status Indicator.

Enable/Disable

The AAT3696 provides an enable function to control the

charger IC on and off. The enable (EN) pin is internally

pulled down with 200k. When EN is pulled down or left

floating, normal device operation commences. When it is

pulled to a logic high level, the AAT3696 charging circuit

will be shut down and forced into sleep state but the

over-voltage protection circuit remains in active state.

Charging will be halted regardless of the battery voltage

or charging state. When the device is re-enabled, the

charge control circuit will automatically reset and resume

charging functions with the appropriate charging mode

based on the battery charge state and measured cell

voltage at the BAT pin.

Low Dropout Regulator

The AAT3696 includes a low dropout regulator with input

range from 5V to the OVP trip point which is 6.75V or

6.25V and is always enabled. The LDO output VOUT is set

to 4.9V and supplies a continuous current up to 30mA.

The LDO output needs to be decoupled with 2.2F to

ground for stability reasons.

Over-Voltage Protection

In normal operation, an OVP switch acts as a load

switch, connecting the power source from IN to INCHR.

This switch is designed with very low resistance to min-

imize the voltage drop between the power source and

the charger and to reduce the power dissipation. When

the voltage on the power source exceeds the OVP trip

point, 6.75V or 6.25V respectively, the switch immedi-

ately becomes open (OFF) and disconnect the load and

the charger from the power source therefore, preventing

damage to any downstream components. Simultaneously,

the fault flag is raised, alerting the system. If an over-

voltage condition is applied at the time of the device

enable, the switch remains open (OFF).

Under-Voltage Lockout (UVLO)

The AAT3696 has a 3V (maximum) under-voltage lock-

out level (UVLO). When the input voltage is less than the

UVLO level, the OVP switch and the charger are turned

off. It is designed with 150mV hysteresis to ensure cir-

cuit stability.

Over-Voltage Fault Flag Output

The over-voltage fault flag (OVPFLG) is an active-low

open-drain fault reporting output. A pull-up resistor

should be connected from to I/O voltage of the system.

In the event of an over-voltage condition OVPFLG will be

asserted immediately with approximately 1s inherited

internal circuit delay. After the over-voltage fault is

released, OVPFLG will be de-asserted with 1.5s delay

(optional of 80ms delay).

Battery Over-Voltage Protection

An over-voltage event is defined as a condition where

the voltage at the BAT pin exceeds the maximum battery

charge voltage and is set by the battery over-voltage

protection threshold (VBOVP). If an overvoltage condition

occurs sensed by the BATS pin, the AAT3696 charge

control will shut down the device until voltage at the BAT

pin drops below VBOVP

. The AAT3696 will resume normal

charging operation after the over-voltage condition is

removed.

Over-Temperature Shutdown

The AAT3696 has a thermal protection control circuit

which will shut down charging functions if the internal

die temperature exceed the preset thermal limit thresh-

old of 140°C. Once the internal die temperature falls

below the thermal limit, normal operation will resume

the previous charging state.

AAT3696

1.6A Linear Li-Ion Battery Charger in 3x3 TDFNBatteryManagerTM

PRODUCT DATASHEET

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Application Information

Constant Charge Current

The constant current charge level is user programmed

with a set resistor connected between the ISET pin and

ground. The accuracy of the constant charge current, as

well as the preconditioning trickle charge current, is

dominated by the tolerance of the set resistor used. For

this reason, a 1% tolerance metal film resistor is recom-

mended for the set resistor function. The constant

charge current levels from 100mA to 1.6A may be set by

selecting the appropriate value from Table 2.

Charge current setting formula:

ICH_CC (typ) = · KIISET

VISET

RSET

Constant Charge

Current (mA) Set Resistor Value (kΩ)

110 15.8

200 7.87

400 3.92

500 3.16

600 2.67

800 1.96

1000 1.58

1500 1.00

Table 2: RSET Values.

Figure 2 shows the relationship of constant charging cur-

rent and set resistor values for the AAT3696.

RSET (kΩ

)

Charging Current (mA)

100

1000

10000

1100.1 100

Figure 2: Constant Charging Current

vs. Set Resistor Values.

Note: The ISET pin is very sensitive and if a total capac-

itive load of more than 20pF is connected, it may start

oscillating.

Battery Connection and

Battery Voltage Sensing

Battery Connection (BAT)

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

between BAT input and ground.

Battery Voltage Sensing (BATS)

The BATS pin is provided to employ an accurate voltage

sensing capability to measure the positive terminal volt-

age at the battery cell being charged. This function

reduces measured battery cell voltage error between the

battery terminal and the charge control IC. The AAT3696

charge control circuit will base charging mode states

upon the voltage sensed at the BATS pin. The BATS pin

must be connected to the battery terminal for correct

operation. If the battery voltage sense function is not

needed, the BATS pin should be terminated directly to

the BAT pin. If there is concern of the battery sense

function inadvertently becoming an open circuit, the

BATS pin may be terminated to the BAT pin using a 10k

resistor. Under normal operation, the connection to the

battery terminal will be close to 0; if the BATS connec-

tion becomes an open circuit, the 10k resistor will pro-

vide feedback to the BATS pin from the BAT connection

with a voltage sensing accuracy loss of 1mV or less.

Status Indicator Display

Simple system charging status states can be displayed

using one LED in conjunction with the STAT pin on the

AAT3696. This pin has a simple switch connecting the

LED’s cathode to ground. Refer to Table 1 for LED display

definitions. The LED anodes should be connected to VIN,

depending upon system design requirements. The LED

should be biased with as little current as necessary to

create reasonable illumination; therefore, a ballast resis-

tor should be placed between the LED cathode and the

STAT pin. LED current consumption will add to the over-

all thermal power budget for the device package, so it is

wise to keep the LED drive current to a minimum. 2mA

should be sufficient to drive most low cost green or red

LED. It is not recommended 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(STAT) = VADP - VFLED

ILED(STAT)

AAT3696

1.6A Linear Li-Ion Battery Charger in 3x3 TDFNBatteryManagerTM

PRODUCT DATASHEET

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Example:

RB(STAT) = = 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(STAT) = VUSB - VFLED

ILED(STAT)

Example:

RB(STAT) = = 900Ω

5.0V - 3.2V

2mA

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

2mA.

IC Input

The AAT3696 has an IC input pin which is internally con-

nected to ground through a 100k resistor.

Capacitor Selection

Input Capacitor

A 1F or larger capacitor is typically recommended for

CIN. CIN should be located as close to the device IN pin

as practically possible. Ceramic, tantalum, or aluminum

electrolytic capacitors may be selected for CIN. There is

no specific capacitor equivalent series resistance (ESR)

requirement for CIN. However, for higher current opera-

tion, ceramic capacitors are recommended for CIN 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 Input Capacitor

A 2.2F decoupling capacitor is recommended to be

placed between INCHR and GND.

Charger Output Capacitor

The AAT3696 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. If the

AAT3696 is used in applications where the battery can

be removed from the charger, such as desktop charging

cradles, an output capacitor greater than 10F may be

required to prevent the device from cycling on and off

when no battery is present.

Linear Regulator Output Capacitor

For proper load voltage regulation and operational sta-

bility, a capacitor is required between LDOOUT and GND.

The output capacitor connection to the LDO regulator

ground pin should be made as directly as practically pos-

sible for maximum device performance. Since the regu-

lator has been designed to function with very low ESR

capacitors, ceramic capacitors in the 1.0F to 10F

range are recommended or best performance.

Applications utilizing the exceptionally low output noise

and optimum power supply ripple rejection of the

AAT3696 should use 2.2F or greater values for the

LDO’s output capacitor.

Printed Circuit Board

Layout Recommendations

For proper thermal management and to take advantage

of the low RDS(ON) of the AAT3696, 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

AAT3696 TDFN3x3 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 the heat

being transferred to the PCB effectively.

AAT3696

1.6A Linear Li-Ion Battery Charger in 3x3 TDFNBatteryManagerTM

PRODUCT DATASHEET

18 3696.2009.07.1.1

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AAT3696

1.6A Linear Li-Ion Battery Charger in 3x3 TDFNBatteryManagerTM

PRODUCT DATASHEET

18 3696.2009.07.1.1

www.analogictech.com

Figure 3: AAT3696 Evaluation Board Top Layer. Figure 4: AAT3696 Evaluation Board Bottom Layer.

1μF

C1 C2

2.2μF

INCHR

JP1 C3

10μF

VIN

GND

4V - 28V BAT

GND

Green LED

Red LED

1.6k

MODE

JP2

LDO

GND

STAT

IC 10

BATS 11

BAT 12

OVPFLG

ISET 9

MODE

6INCHR 1

LDOOUT 3

AAT3696

Figure 5: AAT3696 Evaluation Board Schematic.

AAT3696

1.6A Linear Li-Ion Battery Charger in 3x3 TDFNBatteryManagerTM

PRODUCT DATASHEET

3696.2009.07.1.1 19

www.analogictech.com

AAT3696

1.6A Linear Li-Ion Battery Charger in 3x3 TDFNBatteryManagerTM

PRODUCT DATASHEET

3696.2009.07.1.1 19

www.analogictech.com

Component Part Number Description Manufacturer

U1 AAT3696IWP 1.6A Linear Li-Ion/Polymer Battery Charger in TDFN33-12 Package AnalogicTech

R1 Chip Resistor 1.6k, 1%, 1/4W; 0603 Vishay

R2, R3 Chip Resistor 1k, 5%, 1/4W; 0603 Vishay

C1 GRM31MR71H105KA88 Ceramic 1F 50V 10% X7R 1206 Murata

C2, C4 GRM188R61A225KE34 Ceramic 2.2F 10V 10% X5R 0603 Murata

C3 GRM21BR71A106KE51L Ceramic 10F 10V 10% X7R 0805 Murata

JP1, JP2 PRPN401PAEN Conn. Header, 2mm zip Sullins Electronics

D1 LTST-C190CKT Red LED; 0603 Lite-On Inc.

D2 LTST-C190GKT Green LED; 0603 Lite-On Inc.

Table 3: AAT3696 Evaluation Board Bill of Materials (BOM).

AAT3696 Feature Options

Product

Constant Voltage

Regulation (V)

OVP Trip Point

(V)

OVP Turn On Delay Time

(μs)

Preconditioning Voltage

Threshold (V)

AAT3696-1 4.2 6.75 40 2.6

AAT3696-2 4.2 6.75 80,000 2.6

AAT3696-3 4.375 6.75 40 2.6

AAT3696-4 4.375 6.75 80,000 2.6

AAT3696-5 4.2 6.25 40 2.6

AAT3696-6 4.2 6.25 80,000 2.6

AAT3696-7 4.375 6.25 40 2.6

AAT3696-8 4.375 6.25 80,000 2.6

AAT3696-9 4.2 6.75 40 2.2

AAT3696-10 4.2 6.75 80,000 2.2

AAT3696-11 4.375 6.75 40 2.2

AAT3696-12 4.375 6.75 80,000 2.2

AAT3696-13 4.2 6.25 40 2.2

AAT3696-14 4.2 6.25 80,000 2.2

AAT3696-15 4.375 6.25 40 2.2

AAT3696-16 4.375 6.25 80,000 2.2

Table 4: AAT3696 Options.

AAT3696

1.6A Linear Li-Ion Battery Charger in 3x3 TDFNBatteryManagerTM

PRODUCT DATASHEET

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AAT3696

1.6A Linear Li-Ion Battery Charger in 3x3 TDFNBatteryManagerTM

PRODUCT DATASHEET

20 3696.2009.07.1.1

www.analogictech.com

Ordering Information

Package Marking1Part Number (Tape and Reel)2, 3

TDFN33-12 6EXYY AAT3696IWP-1-T1

TDFN33-12 6FXYY AAT3696IWP-2-T1

TDFN33-12 AAT3696IWP-3-T1

TDFN33-12 AAT3696IWP-4-T1

TDFN33-12 6GXYY AAT3696IWP-5-T1

TDFN33-12 6HXYY AAT3696IWP-6-T1

TDFN33-12 AAT3696IWP-7-T1

TDFN33-12 AAT3696IWP-8-T1

TDFN33-12 AAT3696IWP-9-T1

TDFN33-12 AAT3696IWP-10-T1

TDFN33-12 AAT3696IWP-11-T1

TDFN33-12 AAT3696IWP-12-T1

TDFN33-12 AAT3696IWP-13-T1

TDFN33-12 AAT3696IWP-14-T1

TDFN33-12 AAT3696IWP-15-T1

TDFN33-12 AAT3696IWP-16-T1

All AnalogicTech products are offered in Pb-free packaging. The term “Pb-free” means semiconductor

products that are in compliance with current RoHS standards, including the requirement that lead not exceed

0.1% by weight in homogeneous materials. For more information, please visit our website at

http://www.analogictech.com/about/quality.aspx.

1. XYY = assembly and date code.

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

3. For detailed description of all options, refer to Table 4 on page 19.

AAT3696

1.6A Linear Li-Ion Battery Charger in 3x3 TDFNBatteryManagerTM

PRODUCT DATASHEET

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AAT3696

1.6A Linear Li-Ion Battery Charger in 3x3 TDFNBatteryManagerTM

PRODUCT DATASHEET

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Advanced Analogic Technologies, Inc.

3230 Scott Boulevard, Santa Clara, CA 95054

Phone (408) 737-4600

Fax (408) 737-4611

AnalogicTech cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in an AnalogicTech product. No circuit patent licenses, copyrights, mask work rights, or other intellectual

property rights are implied. AnalogicTech reserves the right to make changes to their products or speciﬁ cations or to discontinue any product or service without notice. Except as provided in AnalogicTech’s terms and

conditions of sale, AnalogicTech assumes no liability whatsoever, and AnalogicTech disclaims any express or implied warranty relating to the sale and/or use of AnalogicTech products including liability or warranties

relating to ﬁ tness for a particular purpose, merchantability, or infringement of any patent, copyright or other intellectual property right. In order to minimize risks associated with the customer’s applications, adequate

design and operating safeguards must be provided by the customer to minimize inherent or procedural hazards. Testing and other quality control techniques are utilized to the extent AnalogicTech deems necessary to

support this warranty. Speciﬁ c testing of all parameters of each device is not necessarily performed. AnalogicTech and the AnalogicTech logo are trademarks of Advanced Analogic Technologies Incorporated. All other

brand and product names appearing in this document are registered trademarks or trademarks of their respective holders.

Package Information

TDFN33-121

Top View Bottom View

Detail "A"

Side View

3.00

0.05

Index Area Detail "A"

1.70

0.05

3.00

0.05

0.23

0.05

0.75

0.05

2.40

0.05

Pin 1 Indicator

(optional)

0.43

0.05

0.45

0.050.23

0.05

0.1 REF

C0.3

All dimensions in millimeters.

1. 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.