AAT3693IDH-AI-T1 - AnalogicTech

AAT3693

1.6A Lithium-Ion/Polymer Battery Charger in 2.2x2.2 TDFN BatteryManagerTM

PRODUCT DATASHEET

3693.2009.04.1.1 1

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General Description

The AAT3693 BatteryManager is a highly integrated sin-

gle-cell lithium-ion/polymer (Li-Ion) battery charger

which operates from a USB port, or an AC adapter input

up to 7.5V input voltage. The AAT3693 precisely regu-

lates battery charge voltage and current for 4.2V Li-Ion

battery cells. The battery charging current can be set by

an external resistor up to 1.6A. Digital Thermal Loop

Control maintains the maximum possible battery charg-

ing current for the given set of input to output power

dissipation and ambient temperature conditions.

Battery charge state is continuously monitored for fault

conditions. In the event of an over-current, over-voltage,

short-circuit, or over-temperature condition, the device

will shut down automatically, thus protecting the charg-

ing device, control system, and the battery under

charge. A status monitor output pin is provided to indi-

cate the battery charge status by directly driving an

external LED. An open-drain power source detection out-

put is provided to report the power supply status. With

the "No-Battery Detection" circuit integrated, the status

LEDs indicate that the battery is not present or not prop-

erly installed.

The AAT3693 is available in the Pb-free, thermally

enhanced, space-saving 2.2x2.2mm 10-pin TDFN pack-

ages and is specified for operation over the -40°C to

+85°C temperature range.

Features

• USB or AC Adapter System Power Charger

• Programmable from 100mA to 1.6A max

• 4.0V ~ 7.5V Input Voltage Range

• High Level of Integration with Internal:

 Charging Device

 Reverse Blocking Diode

 Current Sensing

• Digitized Thermal Regulation

• Charge Current Programming (ISET)

• Charge Termination Current Programming (TERM)

• Charge Timer (CT)

• Battery Temperature Sensing (TS)

• No-Battery Detection

• TS Pin Open Detection

• Automatic Recharge Sequencing

• Full Battery Charge Auto Turn Off/Sleep Mode/Charge

Termination

• Shutdown Current < 6A

• Automatic Trickle Charge for Battery Preconditioning

• Over-Voltage and Over-Current Protection

• Emergency Thermal Protection

• Power On Reset and Soft Start

• 2.2x2.2 TDFN Package

Applications

• Bluetooth™ Headsets

• Cell Phones

• Digital Still Cameras

• MP3 Players

• Personal Data Assistants (PDAs)

• Other Li-Ion Battery Powered Devices

Typical Application

VIN

AAT3693

BAT

ON/OFF

STAT2

Battery

Pack

STAT1

VIN

TERM

GND

Temp

BAT+

CBAT

RTERM

CTRSET

ISET

AAT3693

1.6A Lithium-Ion/Polymer Battery Charger in 2.2x2.2 TDFN BatteryManagerTM

PRODUCT DATASHEET

2 3693.2009.04.1.1

www.analogictech.com

AAT3693

1.6A Lithium-Ion/Polymer Battery Charger in 2.2x2.2 TDFN BatteryManagerTM

PRODUCT DATASHEET

2 3693.2009.04.1.1

www.analogictech.com

Pin Descriptions

Pin # Name Type Function

1 VIN I Input from USB port/adapter connector.

2STAT1 O Charge status pin, open-drain.

3STAT2 O Charge status pin, open-drain.

4 EN I Active high enable pin (with internal pull-down).

5 GND I/O Connect to power ground.

6 CT I Charge timer programming input pin (no timer if grounded).

7 ISET I Charge current programming input pin.

8 TERM I Charge termination current programming input pin (internal default 10% termination cur-

rent if TERM is open).

9 TS I/O Battery temperature sense pin.

10 BAT O Connect to lithium-ion battery.

EP EP Exposed paddle (bottom): Connect to ground as closely as possible to the device.

Pin Configuration

TDFN-10

(Top View)

STAT2

GND

VIN

STAT1 TERM

ISET

BAT

AAT3693

1.6A Lithium-Ion/Polymer Battery Charger in 2.2x2.2 TDFN BatteryManagerTM

PRODUCT DATASHEET

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AAT3693

1.6A Lithium-Ion/Polymer Battery Charger in 2.2x2.2 TDFN BatteryManagerTM

PRODUCT DATASHEET

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Absolute Maximum Ratings1

Symbol Description Value Units

VIN IN continuous -0.3 to 8.0 V

VNBAT, STAT1, STAT2, EN, ISET, TS -0.3 to VIN + 0.3 V

TJJunction Temperature Range -40 to 150 °C

TOP Operating Temperature Range -40 to 85 °C

TLEAD Maximum Soldering Temperature (at Leads) 300 °C

Thermal Information2

Symbol Description Value Units

θJA Maximum Thermal Resistance 50 °C/W

PDMaximum Power Dissipation (TDFN2.2x2.2; TA = 25°C) 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 a FR4 board.

AAT3693

1.6A Lithium-Ion/Polymer Battery Charger in 2.2x2.2 TDFN BatteryManagerTM

PRODUCT DATASHEET

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AAT3693

1.6A Lithium-Ion/Polymer Battery Charger in 2.2x2.2 TDFN BatteryManagerTM

PRODUCT DATASHEET

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Electrical Characteristics

VIN = 5V, TA = -40°C to +85°C, RSET = 1.47K, RTERM = OPEN; unless otherwise noted, typical values are at TA = 25°C.

Symbol Description Conditions Min Typ Max Units

Operation

VIN Input Voltage Range 4.0 7.5 V

VUVLO

Under-Voltage Lockout Threshold Rising Edge 3 4 V

UVLO Hysteresis 150 mV

IOP Operating Current Charge Current = 100mA 0.3 1 mA

ISLEEP Sleep Mode Current VBAT = 4.25V or EN = GND 0.4 1 A

ILEAKAGE Leakage Current from BAT Pin VBAT = 4V, IN Pin Open 0.4 2 A

Voltage Regulation

VCO(REG) Constant Output Voltage 4.158 4.20 4.242 V

VCO/VCO Constant Output Voltage Tolerance 0.5 %

VMIN Preconditioning Voltage Threshold (Option available for no trickle charge) 2.5 2.6 2.9 V

VRCH Battery Recharge Voltage Threshold VBAT_REG

- 0.1 V

Current Regulation

ICC(RANGE) Charge Current Programmable Range 100 1600 mA

ICC/ICC Constant-Current Mode Charge Current VBAT = 3.6V -10 +10 %

VISET ISET Pin Voltage 2V

KI_SET Charge Current Set Factor: ICH_CC/IISET Constant Current Mode, VBAT = 3.6V 800

VTERM TERM Pin Voltage RTERM = 13.3k2V

ICH_TRK/ICC Trickle Charge Current 5 10 15 % ICH_CC

ICH_TERM/ICC Charge Termination Threshold Current TERM pin open 5 10 15 % ICH_CC

RTERM = 13.3k, ICC  800mA 8 10 12 %

Charging Devices

RDS(ON) Charging Transistor On-Resistance VIN = 4.6V, VBAT = 4.0V,

Charge Current = 1A 0.6 

Logic Control / Protection

VEN(H) Input High Threshold 1.6 V

VEN(L) Input Low Threshold 0.4 V

VSTAT STAT PIN Output Voltage STAT pin sinks 4mA 0.4 V

ISTAT STAT Pin Current Sink Capability 8mA

VOVP Over-Voltage Protection Threshold 4.4 V

IOCP Over-Current Protection Threshold (In Constant Voltage Mode) 105 % ICH_CC

TSNOBAT

TS Voltage Range for No Battery Indi-

cation

VIN

–

50mV

Option for AA, AC, AI, AK1

TKTrickle Time Out CCT = 0.1F, V IN = 5V 25 Minutes

TC + TVCC + CV Mode Time Out CCT = 0.1F, V IN = 5V 3 Hours

Option for AB, AD, AJ, AK1

TKNo Trickle Charge 0 Minutes

TC + TVCC + CV Mode Time Out CCT = 0.1F, V IN = 5V 3 Hours

Option for AE, AG1

TKTrickle Time Out CCT = 0.1F, V IN = 5V 25 Minutes

TCCC Mode Time Out CCT = 0.1F, V IN = 5V 1 Hours

TVCV Mode Time Out CCT = 0.1F, V IN = 5V 2 Hours

1. Only options AA, AB, AI and AJ have been released.

AAT3693

1.6A Lithium-Ion/Polymer Battery Charger in 2.2x2.2 TDFN BatteryManagerTM

PRODUCT DATASHEET

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AAT3693

1.6A Lithium-Ion/Polymer Battery Charger in 2.2x2.2 TDFN BatteryManagerTM

PRODUCT DATASHEET

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Electrical Characteristics (continued)

VIN = 5V, TA = -40°C to +85°C, RSET = 1.47K, RTERM = OPEN; unless otherwise noted, typical values are at TA = 25°C.

Symbol Description Conditions Min Typ Max Units

Option for AF, AH1

TKNo Trickle Charge 0 Minutes

TCCC Mode Time Out CCT = 0.1F, V IN = 5V 1 Hours

TVCV Mode Time Out CCT = 0.1F, V IN = 5V 2 Hours

Option for AC, AD, AG, AH, AK, AL, BO, BP1

ITS Current Source from TS Pin 75 uA

VTS1 High Temperature Threshold Threshold 331 mV

Hysteresis 25 mV

VTS2 Low Temperature Threshold Threshold 2.39 V

Hysteresis 25 mV

Option for AA, AB, AE, AF, AI, AJ, BM, BN1

VTS1 High Temperature Threshold 29.1 30 30.9 %VIN

VTS2 Low Temperature Threshold 58.2 60 61.8 %VIN

TLOOP_IN Thermal Loop Entering Threshold 115 ºC

TLOOP_OUT Thermal Loop Exiting Threshold 85 ºC

TREG Thermal Loop Regulation 100 ºC

TSHDN Chip Thermal Shutdown Temperature Threshold 140 ºC

Hysteresis 15 ºC

1. Only options AA, AB, AI and AJ have been released.

AAT3693

1.6A Lithium-Ion/Polymer Battery Charger in 2.2x2.2 TDFN BatteryManagerTM

PRODUCT DATASHEET

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AAT3693

1.6A Lithium-Ion/Polymer Battery Charger in 2.2x2.2 TDFN BatteryManagerTM

PRODUCT DATASHEET

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Typical Characteristics

Charging Current vs. Set Resistor Values

RSET (kΩ

)

Charging Current (mA)

100

1000

10000

1100.1 100 1000

Constant Charging Current

Pre-conditioning Current

Charging Current vs. Battery Voltage

Battery Voltage (V)

Charging Current (mA)

2.5 2.7 2.9 3.1 3.3 3.5 3.7 3.9 4.1 4.3

0.2

0.4

0.6

0.8

1.2

1.4

1.6

1.8

RSET = 866Ω

RSET = 1.47kΩ

RSET = 3.16kΩ

RSET = 8.06kΩ

Battery Charger Constant Output

Voltage Accuracy vs. Input Voltage

(Battery Voltage = 4.2V)

Input Voltage (V)

VCO/VCO (%)

4.5 5 5.5 6 6.5 7 7.5

0.01

0.02

0.03

0.04

0.05

0.06

0.07

0.08

0.09

Battery Charger Constant Output Voltage

vs. Temperature

Temperature (°C)

VCO(REG) (V)

-40 -15 10 35 60 85

4.18

4.19

4.2

4.21

4.22

Preconditioning Charge Current vs. Temperature

(RSET = 866Ω)

Temperature (°C)

Preconditioning Charge Current (mA)

-40 -15 10 35 60 85

155

157

159

161

163

165

Preconditioning Voltage Threshold vs. Temperature

Temperature (°C)

VMIN (V)

-40 -15 10 35 60 85

2.4

2.45

2.5

2.55

2.6

2.65

2.7

AAT3693

1.6A Lithium-Ion/Polymer Battery Charger in 2.2x2.2 TDFN BatteryManagerTM

PRODUCT DATASHEET

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AAT3693

1.6A Lithium-Ion/Polymer Battery Charger in 2.2x2.2 TDFN BatteryManagerTM

PRODUCT DATASHEET

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Typical Characteristics

Preconditioning Charge Current vs. Input Voltage

Input Voltage (V)

ICH_TRK (mA)

4 4.5 5 5.5 6 6.5 7 7.5

100

125

150

175

200

225

250

RSET = 0.866KΩ

RSET = 1.471KΩ

RSET = 3.229KΩ

RSET = 8.07KΩ

Battery Recharge Voltage Threshold vs. Temperature

Temperature (°C)

VRCH (V)

-40 -15 10 35 60 85

4.04

4.06

4.08

4.10

4.12

4.14

Constant Charging Current vs. Input Voltage

(RSET = 0.866kΩ)

Input Voltage (V)

Constant Charging Current (mA)

4.0 4.5 5.0 5.5 6.0 6.5 7.0 7.5

1300

1400

1500

1600

1700

1800

VBAT = 3.3V

VBAT = 3.6V

VBAT = 3.9V

VBAT = 4.1V

Current Source at the TS Pin vs. Temperature

(for Option AC, AD, AG, AH, AK, AL, BO, BP)

Temperature (°C)

ITS (µA)

-40 -15 10 35 60 85

Low Temperature Threshold vs. Temperature

(For Option AC, AD, AG, AH, AK, AL, BO, BP)

Temperature (°C)

Low Temperature Threshold,

TS2 (V)

-40 -15 10 35 60 85

2.32

2.34

2.36

2.38

2.4

2.42

2.44

2.46

High Temperature Threshold vs. Temperature

(For Option AC, AD, AG, AH, AK, AL, BO, BP)

Temperature (°C)

High Temperature Threshold,

TS1 (V)

-40 -15 10 35 60 85

0.32

0.325

0.33

0.335

0.34

0.345

AAT3693

1.6A Lithium-Ion/Polymer Battery Charger in 2.2x2.2 TDFN BatteryManagerTM

PRODUCT DATASHEET

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AAT3693

1.6A Lithium-Ion/Polymer Battery Charger in 2.2x2.2 TDFN BatteryManagerTM

PRODUCT DATASHEET

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Typical Characteristics

Low Temperature Threshold vs. Temperature

(For Option AA, AB, AE, AF, AI, AJ, BM, BN; VIN = 5V)

Temperature (°C)

Low Temperature Threshold

TS2 (V)

-40 -15 10 35 60 85

2.97

2.98

2.99

3.01

3.02

High Temperature Threshold vs. Temperature

(For Option AA, AB, AE, AF, AI, AJ, BM, BN; VIN = 5V)

Temperature (°C)

High Temperature Threshold

TS1 (V)

-40 -15 10 35 60 85

1.47

1.48

1.49

1.5

1.51

1.52

Operating Current vs. ISET Resistor

RSET (kΩ

)

Operating Current (mA)

1100.1 100 1000

0.0

0.5

1.0

1.5

2.0

2.5

3.0

Constant Charging Current

Pre-conditioning Current

Shutdown Current vs. Input Voltage

Input Voltage (V)

ISHDN (µA)

4.0 4.5 5.0 5.5 6.0 6.5 7.0 7.5

0.2

0.4

0.6

0.8

1.2

1.4

1.6

85°C

25°C

-40°C

Counter Timeout vs. Temperature

(CT = 0.1µF)

Temperature (°C)

Counter Timeout (%

)

-40 -15 10 35 60 85

-0.10

-0.05

0.00

0.05

0.10

CT Pin Capacitance vs. Counter Timeout

Time (hours)

Capacitance (µF

)

01 2345

0.0

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0.8

0.9

1.0

Preconditioning Timeout

Preconditioning + Constant Current

Timeout or Constant Voltage Timeout

AAT3693

1.6A Lithium-Ion/Polymer Battery Charger in 2.2x2.2 TDFN BatteryManagerTM

PRODUCT DATASHEET

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AAT3693

1.6A Lithium-Ion/Polymer Battery Charger in 2.2x2.2 TDFN BatteryManagerTM

PRODUCT DATASHEET

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Typical Characteristics

Termination Current to Constant Current

Ratio (%) vs. Termination Resistance

ITERM Resistance (kΩ)

ICH_TERM/ICC (%)

0 1020 3040 5060

10%

20%

30%

40%

50%

Charging Transistor On Resistance

vs. Input Voltage

Input Voltage (V)

RDS(ON) (Ω

)

3.6 3.9 4.2 4.5 4.8 5.1

200

250

300

350

400

450

500

550

600

85°C

25°C

-40°C

Input High Threshold vs. Input Voltage

Input Voltage (V)

VEN(H) (V

)

4.0 4.5 5.0 5.5 6.0 6.5 7.0 7.5

0.6

0.7

0.8

0.9

1.1

1.2

1.3

1.4

85°C

25°C

-40°C

Input Low Threshold vs. Input Voltage

Input Voltage (V)

VEN(L) (V

)

4.0 4.5 5.0 5.5 6.0 6.5 7.0 7.5

0.4

0.5

0.6

0.7

0.8

0.9

1.1

1.2

85°C

25°C

-40°C

AAT3693

1.6A Lithium-Ion/Polymer Battery Charger in 2.2x2.2 TDFN BatteryManagerTM

PRODUCT DATASHEET

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AAT3693

1.6A Lithium-Ion/Polymer Battery Charger in 2.2x2.2 TDFN BatteryManagerTM

PRODUCT DATASHEET

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Functional Description

The AAT3693 is a high performance battery charger

designed to charge single-cell lithium-ion or lithium-

polymer batteries with up to 1.6A of current from an

external power source. It is a stand-alone charging solu-

tion, with just one external component required for com-

plete functionality.

The AAT3693 precisely regulates battery charge voltage

and current for 4.2V lithium-ion/polymer battery cells

with constant current level being programmed up to 1.6A

for rapid charging applications. The charge termination

current can be programmed by an external resistor.

The AAT3693 is rated for operation from -40°C to +85°C.

In the event of operating ambient temperatures exceed-

ing the power dissipation abilities of the device package

for a given constant current charge level, the charge

control will enter into thermal limit.

The AAT3693 provides two status monitor output pins

(STAT1 and STAT2) which directly drive two external

LEDs to indicate the battery charging state. With no-

battery detection and status indication, the user can be

notified if battery is not inserted properly.

Device junction temperature and charge state are fully

monitored for fault conditions. In the event of an over-

voltage or over-temperature failure, the device will auto-

matically shut down, protecting the charging device,

control system, and the battery under charge.

During battery charging, the device temperature will

rise. In some cases with adapter charging, the power

dissipation in the device may cause the junction tem-

perature to rise closer to its thermal shutdown threshold.

Functional Block Diagram

Charge

Control

Current

Comparator

Reverse Blocking

CV/

Pre-charge

Constant

Current

IN BAT

ISET

UVLO

Over-Temp.

Protect

STAT1

GND

Thermal

Loop

Charge

Status STAT2

Battery OV Protection

Watchdog

Timer

TERM

AAT3693

1.6A Lithium-Ion/Polymer Battery Charger in 2.2x2.2 TDFN BatteryManagerTM

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In the event of an internal over-temperature condition

caused by excessive ambient operating temperature or

excessive power dissipation condition, the AAT3693

enables a digitally controlled thermal loop system that

will reduce the charging current to prevent the device

from thermal shutdown. The digital thermal loop will

maintain the maximum possible battery charging cur-

rent for the given set of input to output power dissipa-

tion and ambient temperature conditions.

The digital thermal loop control is dynamic in the sense

that it will continue to adjust the battery charging cur-

rent as operating conditions change.

The digital thermal loop will reset and resume normal

operation when the power dissipation or over tempera-

ture conditions are removed.

Charging Operation

Figure 1 illustrates the entire battery charging profile or

operation, which consists of four phases:

1. Preconditioning (Trickle) Charge

2. Constant Current Charge

3. Constant Voltage Charge

4. Automatic Recharge

Battery Preconditioning

Battery charging commences only after the AAT3693

checks several conditions in order to maintain a safe

charging environment. The input supply must be above

the minimum operating voltage (VUVLO) and the enable

pin must be high.

When the battery is connected to the BAT pin, the

AAT3693 checks the condition of the battery and deter-

mines which charging mode to apply. If the battery volt-

age is below the preconditioning voltage threshold, VMIN,

then the AAT3693 begins preconditioning the battery cell

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

constant current. For example, if the programmed cur-

rent is 500mA, then the preconditioning mode (trickle

charge) current is 50mA. Battery cell preconditioning

(trickle charging) is a safety precaution for deeply dis-

charged cells and will also reduce the power dissipation

in the internal series pass MOSFET when the input-out-

put voltage differential is at the greatest potential.

Constant Current Charging

Battery cell preconditioning continues until the battery

voltage reaches the preconditioning voltage threshold,

VMIN. At this point, the AAT3693 begins constant current

charging. The current level for this mode is programmed

using a single resistor from the ISET pin to ground.

Programmed current can be set from a minimum of

100mA up to a maximum of 1.6A

Constant Voltage Charging

Constant current charging will continue until the battery

voltage reaches the constant output voltage (end of

charge) voltage regulation point, VCO(REG). When the bat-

tery voltage reaches VCO(REG), the AAT3693 will transition

to constant voltage mode. The regulation voltage is fac-

tory programmed to a nominal 4.2V and will continue

charging until the charge termination current is reached.

Constant Current

Charge Phase

Preconditioning

Trickle Charge

Pha se

Charge Complete Voltage

Constant Curre n t Mode

Voltage Threshold

Regulated Current

Trickle Charge and

Termination Threshold

I = CC / 10

I = Max CC

Batte ry Recharg e

Voltage Threshold

Battery Discharge

Constant Voltage

Charge Phase

Constant Voltage

Charge Phase

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

AAT3693

1.6A Lithium-Ion/Polymer Battery Charger in 2.2x2.2 TDFN BatteryManagerTM

PRODUCT DATASHEET

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System Operation Flowchart

Reset

Power Input

Voltage

VIN > VUVLO

Fault Conditions

Monitoring

OV, OT,

VTS1 < TS < VTS2

Preconditioning

Test

VMIN > VBAT

Current Phase Test

VCO > VBAT

Voltage Phase Test

ICHARGE > ICH_TERM

Yes

Preconditioning

(Trickle Charge)

Constant

Current Charge

Mode

Constant

Voltage Charge

Mode

Yes

Charge Completed

Charge Timer

Counter

Expired

Recharge Test

VBAT < VRCH

Yes

Enable

Yes

Device Thermal

Loop Monitor

TJ>115°C

Thermal Loop

Current

Reduction in ADP

Charging Mode

Thermal Loop

Current

Reduction in

C.C. Mode

Enable

Shut Down

Power On

Power Input

Voltage

VIN > VUVLO

And EN=High

Yes

Charge

Suspended

Reset

AAT3693

1.6A Lithium-Ion/Polymer Battery Charger in 2.2x2.2 TDFN BatteryManagerTM

PRODUCT DATASHEET

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Application Information

Adapter or USB Power Input

Constant current charge levels up to 1.6A may be pro-

grammed by the user when powered from a sufficient

input power source. The AAT3693 will operate from the

adapter input over a 4.0V to 7.5V range. The constant

current mode fast charge current for the adapter input

is set by the RSET resistor connected between ISET and

ground. Refer to Table 1 for recommended RSET values

for a desired constant current charge level; values are

rounded off to 1% standard resistance values.

Automatic Recharge

The AAT3693 has a UVLO and power on reset feature so

that if the input supply to the VIN pin drops below the

UVLO threshold, the charger will suspend charging and

shut down. When power is reapplied to the IN pin or the

UVLO condition recovers, the system charge control will

assess the state of charge on the battery cell and will

automatically resume charging in the appropriate mode

for the condition of the battery.

Enable / Disable

The AAT3693 provides an enable function to control the

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

pulled down. When pulled to a logic high level, the

AAT3693 is enabled. When left open or pulled to a logic

low level, the AAT3693 will be shut down. 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 on

the BAT pin.

Programming Charge Current

The constant current mode charge level is user pro-

grammed with a set resistor placed 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 resis-

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

resistor is recommended for the set resistor function.

The constant charge current levels from 100mA to 1.6A

may be set by selecting the appropriate resistor value

from Table 1.

Constant Charging

Current (mA) Set Resistor Value (k)

100 16.5

200 8.06

300 5.36

400 4.02

500 3.16

600 2.67

700 2.26

800 1.87

900 1.78

1000 1.47

1250 1.18

1600 0.866

Table 1: Constant Charging Current vs. RSET.

RSET (kΩ

)

Charging Current (mA)

100

1000

10000

1100.1 100 1000

Constant Charging Current

Pre-conditioning Current

Figure 2: Charging Current vs. RSET Values.

Programmable Charge

Termination Current

The AAT3693 provides a user-programmable charge ter-

mination current at the end of the charge cycle. When

the battery cell voltage as sensed by the BAT pin reach-

es 4.2V, the charge control will transition from constant

current fast charge mode to constant voltage mode. In

constant voltage mode, the battery cell voltage will be

regulated at 4.2V. The charge current will drop as the

battery reaches its full charge capacity. When the charge

current drops to the programmed end of charge VCO(REG)

current, the charge cycle is complete and the charge

controller terminates the charging process.

If the TERM pin is left open, the termination current will

set to 10% of the constant charging current as the

default value.

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The charge termination current ICH_TERM can be pro-

grammed by connecting a resistor from TERM to GND.

Use the values listed in Table 2 to set the desired charge

termination current.

RTERM (K)I

CH_TERM (%)

6.65 5%

13.3 10%

26.7 20%

40.2 30%

53.6 40%

Table 2: Charge Termination Current

Programming Resistor Values.

RTERM (kΩ

)

ICH_TERM (%)

10%

20%

30%

40%

50%

10 20030405060

Figure 3: Charge Termination Current vs. RTERM.

If the desired end of charge termination current level is

not listed in Table 2, the TERM resistor value may be

calculated by the following equation:

ICH_TERM = · ICC

15μA · RTERM

When the charge current drops to the programmed

charge termination current level in the constant voltage

mode, the device terminates charging and goes into a

sleep state. The charger will remain in this sleep state

until the battery voltage decreases to a level below the

battery recharge voltage threshold (VRCH).

In such cases where the AAT3693 input voltage drops,

the device will enter sleep state and automatically

resume charging once the input supply has recovered

from the fault condition. Consuming very low current in

sleep state, the AAT3693 minimizes battery drain when

it is not charging. This feature is particularly useful in

applications where the input supply level may fall below

the battery charge or under-voltage lockout level.

Charge Status Outputs

The AAT3693 provides battery charge status via two

status pins. These pins are internally connected to an

N-channel open-drain MOSFET, which can be used drive

external LEDs. The status pins can indicate the following

conditions.

Event Description

All Options

Options AA, AB, AE, AF,

AI, AJ, BM and BN

Options AC, AD, AG, AH,

AK, AL, BO and BP

STAT1 STAT2 Type 1 STAT2 Type 2

No Battery (with Charge Enabled) Flash Flash Flash

Battery Charging Low High High

Charge Complete High Low High

Fault Condition High High Low

Table 3: LED Status Indicator (STATx Pulled Up to a Voltage Source with Resistors and LED).

Note: Low = LED ON; High = LED OFF

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The AAT3693 has a battery fault detector, which, when

used in conjunction with a 0.1F capacitor on the CT pin,

outputs a 1Hz signal with 50% duty cycle at the STAT1

pin in the event of a timeout while in the trickle charge

mode.

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

Status LED Setup

The LEDs should be biased with as little current as nec-

essary to create reasonable illumination; therefore, a

ballast resistor should be placed between the LED cath-

ode and the STAT pin. 2mA should be sufficient to drive

most low-cost green or red LEDs. It is not recommended

to exceed 8mA for driving an individual status LED. The

required ballast resistor values can be estimated using

the following formula:

RBALLAST = (VIN - VFLED)

ILED

Example:

RBALLAST = = 1.5kΩ

(5.0V - 2.0V)

2mA

Note: Red LED forward voltage (VF) is typically 2.0V @

2mA.

Protection Circuitry

No-Battery Detection

After a battery is inserted and the AAT3693 detects the

present of the battery, the regular LED reporting indi-

cates the current charging status after 5-6 flashes. If the

battery is not detected, the status LEDs flash at a fre-

quency of 1Hz with ~50% duty cycle ratio continuously

on all options (AAT3693 AA, AB, … , BO and BT), except

AI and AJ.

The no-battery detection circuit is not integrated in the

AAT3693 AI or AJ. For these two options, the charger IC

treats the output ceramic capacitor as a battery. Since

the capacitance of the ceramic capacitor is very small,

the charge cycle is shortened and the STAT1 LED stays

off for a long time and on for a very short time. Therefore,

the STAT1 LED appears to always be OFF. In addition,

since the ceramic capacitor’s discharge cycle is much

longer than its charge cycle, the STAT2 LED appears to

remain ON because the brief OFF phase of the cycle is so

short that the human eye cannot perceive it.

If the thermal sensing TS pin is open it will be consid-

ered as no battery condition. Please refer to the "Battery

Temperature Fault Monitoring" section in order to deter-

mine the proper biasing for the TS pin.

Programmable Watchdog Timer

The AAT3693 contains a watchdog timing circuit to shut

down charging functions in the event of a defective bat-

tery cell not accepting a charge over a preset period of

time. Typically, a 0.1F ceramic capacitor is connected

between the CT pin and ground. When a 0.1F ceramic

capacitor is used, the device will time out a shutdown

condition if the trickle charge mode exceeds 25 minutes.

The time out timer will reset at start of the constant cur-

rent mode setting the time out to 1 hour (default). When

the device transitions to the constant voltage mode, the

timing counter is reset and will time out after an addi-

tional 2 hours if the charge current does not drop to the

charge termination level for options AE, AF, AG, AH, BM,

BN, BO and BP. For all other options (AA, AB, AC, AD, AI,

AJ, AK and AL) the timeout timer does not reset at every

charging mode and will time out in 3 hours (default).

Mode Timer Time Units

Trickle Charge (TC) Timeout Reset 25 Minute

Constant Current (CC) Timeout Reset 1 Hour

Constant Voltage (CV) Timeout Reset 2 Hour

Table 4: Watchdog Timer Time-out Options.

Assuming: CT = 0.1F and VIN = 5.0V

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

periods would be doubled. If the programmable watch-

dog timer function is not needed, it can be disabled by

connecting the CT pin to ground. The CT pin should not

be left floating or un-terminated, as this will cause errors

in the internal timing control circuit. The constant cur-

rent 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 dominated by the capacitance value,

a 10% tolerance or better ceramic capacitor is recom-

mended. Ceramic capacitor materials, such as X7R and

X5R types are a good choice for this application.

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Battery Over-Voltage Protection

An over-voltage event is defined as a condition where the

voltage on the BAT pin exceeds the maximum battery

charge voltage and is set by the overvoltage protection

threshold (VOVP). If an over-voltage condition occurs, the

AAT3693 charge control will shut down the device until

the voltage on the BAT pin drops below VOVP

. The AAT3693

will resume normal charging operation after the overvolt-

age condition is removed. During an over-voltage event,

the STAT1 LED will report a system fault.

Over-Temperature Shutdown

The AAT3693 has a thermal protection control circuit

which will shut down charging functions should the inter-

nal die temperature exceed the preset thermal limit

threshold. Once the internal die temperature falls below

the thermal limit, normal operation will resume the pre-

vious charging state.

Battery Temperature Fault Monitoring

In the event of a battery over-temperature condition, the

charge control will turn off the internal pass device.. The

STAT LEDs will also display a system fault. After the sys-

tem recovers from a temperature fault, the device will

resume charging operation.

The AAT3693 checks battery temperature before starting

the charge cycle, as well as during all phases of charging.

This is accomplished by monitoring the voltage at the TS

pin. This system is intended for use with negative tem-

perature coefficient thermistors (NTC) which are typically

integrated into the battery package. Most of the com-

monly used NTC thermistors in battery packs are approx-

imately 10k at room temperature (25°C).

For options AC, AD, AG, AH, AK, AL, BO, and BP, the TS

pin has been specifically designed to source 75A of cur-

rent to the thermistor. The voltage on the TS pin result-

ing from the resistive load should stay within a window

of 331mV to 2.39V. If the battery becomes too hot dur-

ing charging due to an internal fault or excessive con-

stant charge current, the thermistor will heat up and

reduce in value, pulling the TS pin voltage lower than the

TS1 threshold, and the AAT3693 will stop charging until

the condition is removed, then charging will be

resumed.

If the use of the TS pin function is not required by the

system, it should be terminated to ground using a 10k

resistor. The internal battery temperature sensing sys-

tem is comprised of two comparators which establish a

voltage window for safe operation.

For options AA, AB, AE, AF, AI, AJ, BM, and BN, 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

= 0.30 · VIN and the TS2 threshold = 0.60 · VIN.

0.60x VIN

x VIN

VIN

Battery Cold Fault

Battery Hot Fault

Battery Temperature Sense Circuit

AAT3693-AA, AB, AE, AF, AI, AJ, BM, BN

Battery

Pack

Figure 4: Battery Temperature Sensing Operation.

Digital Thermal Loop Control

Due to the integrated nature of the linear charging con-

trol pass device for the adapter mode, a special thermal

loop control system has been employed to maximize

charging current under all operation conditions. The

thermal management system measures the internal cir-

cuit die temperature and reduces the fast charge current

when the device exceeds a preset internal temperature

control threshold. Once the thermal loop control becomes

active, the fast charge current is initially reduced by a

factor of 0.44.

The initial thermal loop current can be estimated by the

following equation:

ITLOOP = ICC • 0.44

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PRODUCT DATASHEET

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The thermal loop control re-evaluates the circuit die

temperature every three seconds and adjusts the fast

charge current back up in small steps to the full fast

charge current level or until an equilibrium current is

discovered and maximized for the given ambient tem-

perature condition. The thermal loop controls the sys-

tem charge level; therefore, the AAT3693 will always

provide the highest level of constant current in the fast

charge mode possible for any given ambient tempera-

ture condition

Thermal Considerations

The AAT3693 is offered in the TDFN2.2x2.2-10 package,

which can provide up to 2W of power dissipation when

properly bonded to a printed circuit board and has a

maximum thermal resistance of 50°C/W. Many consid-

erations should be taken into account when designing

the printed circuit board layout, as well as the place-

ment of the charger IC package in proximity to other

heat generating devices in a given application design.

The ambient temperature around the charger IC will

also have an effect on the thermal limits of a battery

charging application. The maximum limits that can be

expected for a given ambient condition can be estimated

by the following discussion.

First, the maximum power dissipation for a given situa-

tion should be calculated:

J -

)

D(MAX)

= θ

Where:

PD(MAX) = Maximum Power Dissipation (W)

JA = Package Thermal Resistance (°C/W)

TJ = Thermal Loop Entering Threshold (°C) (115°C]

TA = Ambient Temperature (°C)

Figure 5 shows the relationship between maximum power

dissipation and ambient temperature for the AAT3693.

TA (°

PD(MAX) (W)

0.5

1.5

2.5

0 25 50 75 100

Figure 5: Maximum Power Dissipation Before

Entering Thermal Loop.

Next, the power dissipation can be calculated by the fol-

lowing equation:

PD = [(VIN - VBAT) · ICC + (VIN · IOP)]

Where:

PD = Total Power Dissipation by the Device

VIN = Input Voltage

VBAT = Battery Voltage as Seen at the BAT Pin

ICH = Constant Charge Current Programmed for the

Application

IOP = Quiescent Current Consumed by the Charger IC

for Normal Operation [0.3mA]

By substitution, we can derive the maximum charge cur-

rent before reaching the thermal limit condition (thermal

loop). The maximum charge current is the key factor

when designing battery charger applications.

D(MAX) -

)

- V

BAT

CH(MAX)

J(MAX) -

)

CH(MAX)

- V

BAT

In general, the worst condition is the greatest voltage

drop across the charger IC, when battery voltage is

charged up to the preconditioning voltage threshold and

before entering thermal loop regulation.

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Figure 6 shows the maximum charge current at different

ambient temperatures.

VIN (V)

ICC_MAX (mA)

200

400

600

800

1000

4.25 4.5 4.75 5 5.25 5.5 5.75 6 6.25 6.5 6.75 7

TA = 85°CTA = 60°C

TA = 45°C

TA = 25°C

Figure 6: Maximum Charging Current Before the

Digital Thermal Loop Becomes Active.

Capacitor Selection

Input Capacitor

In general, it is good design practice to place a decou-

pling capacitor closer to the IC and between the IN pin

and GND.

An input capacitor in the range of 1F to 22F is recom-

mended. If the source supply is unregulated, it may be

necessary to increase the capacitance to keep the input

voltage above the under-voltage lockout threshold dur-

ing device enable and when battery charging is initiated.

If the AAT3693 adapter input is used in a system with an

external power supply source, such as a typical AC-to-

DC wall adapter, then a CIN capacitor in the range of 10F

should be used. A larger input capacitor in this applica-

tion will minimize switching or power transient effects

when the power supply is “hot plugged”.

Output Capacitor

The AAT3693 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

AAT3693 is to be used in applications where the battery

can be removed from the charger, such as with 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. It is good design

practice to place the decoupling capacitor closer to the

IC and between the BAT pin and GND.

PCB Layout Considerations

For the best results, it is recommended to physically

place the battery pack as close as possible to the

AAT3693 BAT pin. To minimize voltage drops on the PCB,

keep the high current carrying traces adequately wide.

When designing with >500mA charging current system,

a multilayer ground plane PCB design is highly recom-

mended. Putting thermal vias on the thermal pad design

will effectively transfer heat from the top metal layer of

the PCB to the inner or bottom layers. The number of

thermal vias will depend on the application and power

dissipation. The AAT3693 evaluation board is a layout

example for reference.

AAT3693

1.6A Lithium-Ion/Polymer Battery Charger in 2.2x2.2 TDFN BatteryManagerTM

PRODUCT DATASHEET

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AAT3693

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PRODUCT DATASHEET

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Figure 6: AAT3693 Evaluation Board Figure 7: AAT3693 Evaluation Board

Top Side Layout. Middle 1 Layer Layout.

Figure 8: AAT3693 Evaluation Board Figure 9: AAT3693 Evaluation Board

Middle 2 Layer Layout. Bottom Side Layout.

AAT3693

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PRODUCT DATASHEET

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10μF

1.47K

Stat2

10k

(see notes)

13.3k

(G)

(R)

0.1μF

10μF

Stat1

1.5k

VIN BAT

VIN

GND

4ISET 7

CT 6

STAT2

BAT 10

STAT1

TERM 8

TS 9

AAT3693IDHU1

R5: 10k for options AA, AB, AE, AF, AI, AJ, BM, BN

R5: OPEN for options AC, AD, AG, AH, AK, AL, BO, BP

Figure 10: AAT3693 Evaluation Board Schematic.

Component Part Number Description Manufacturer

U1 AAT3693IDH 1.6A Linear Li-Ion/Polymer Battery Charger

in 2.2x2.2 TDFN Package AnalogicTech

R1 CRCW04021501F 1.47K, 1%, 1/4W; 0603 Vishay

R2 CRCW04021332F 13.3K, 1%, 1/4W; 0603 Vishay

R5, R6 CRCW04021002F 10K, 5%, 1/4W; 0603 Vishay

R3, R4 CRCW04021001F 1.5K, 5%, 1/4W; 0603 Vishay

C1, C2 GRM21BR71A106KE51L CER 10F 10V 10% X7R 0805 Murata

C3 TMK105BJ104KV CER 0.1F 25V 10% X5RR 0402 Taiyo Yuden

EN PRPN401PAEN Conn. Header, 2mm zip Sullins Electronics

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

D2 LTST-C190CKT Red LED; 0603 Lite-On Inc.

Table 9: AAT3693 Evaluation Board Bill of Materials (BOM).

AAT3693

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Option

Name

Trickle

Charge

Mode

Temperature Sense

Low

Battery

Check

Status

Reporting Charge Timer

Constant

Output

Voltage

VCO(REG), V

Low

Threshold

High

Threshold STAT1 STAT2

Trickle

Charge

(TC)

Timeout

Constant

Current

(CC)

Charge

Timeout

Constant

Voltage

(CV)

Charge

Timeout

AA Yes 30% of VVIN 60% of VVIN Yes Yes Type 1 3 hours total 4.2

AB No 30% of VVIN 60% of VVIN Yes Yes Type 1 3 hours total 4.2

AC Yes 0.33V Fixed 2.39V Fixed Yes Yes Type 2 3 hours total 4.2

AD No 0.33V Fixed 2.39V Fixed Yes Yes Type 2 3 hours total 4.2

AE Yes 30% of VVIN 60% of VVIN Yes Yes Type 1 25 min 1 hour 2 hours 4.2

AF No 30% of VVIN 60% of VVIN Yes Yes Type 1 25 min 1 hour 2 hours 4.2

AG Yes 0.33V Fixed 2.39V Fixed Yes Yes Type 2 25 min 1 hour 2 hours 4.2

AH No 0.33V Fixed 2.39V Fixed Yes Yes Type 2 25 min 1 hour 2 hours 4.2

AI Yes 30% of VVIN 60% of VVIN No Yes Type 1 3 hours total 4.2

AJ No 30% of VVIN 60% of VVIN No Yes Type 1 3 hours total 4.2

AK Yes 0.33V Fixed 2.39V Fixed No Yes Type 2 3 hours total 4.2

AL No 0.33V Fixed 2.39V Fixed No Yes Type 2 3 hours total 4.2

BM Yes 30% of VVIN 60% of VVIN Yes Yes Type 1 25 min 1 hour 2 hours 4.37

BN No 30% of VVIN 60% of VVIN Yes Yes Type 1 25 min 1 hour 2 hours 4.37

BO Yes 0.33V Fixed 2.39V Fixed Yes Yes Type 2 25 min 1 hour 2 hours 4.37

BP No 0.33V Fixed 2.39V Fixed Yes Yes Type 2 25 min 1 hour 2 hours 4.37

Table 10: AAT3693 Options.

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Ordering Information

Package Marking1Part Number (Tape and Reel)2

TDFN-10 (2.2x2.2mm) 5FXYY AAT3693IDH-AA-T1

TDFN-10 (2.2x2.2mm) 7DXYY AAT3693IDH-AB-T1

TDFN-10 (2.2x2.2mm) AAT3693IDH-AC-T1

TDFN-10 (2.2x2.2mm) AAT3693IDH-AD-T1

TDFN-10 (2.2x2.2mm) AAT3693IDH-AE-T1

TDFN-10 (2.2x2.2mm) AAT3693IDH-AF-T1

TDFN-10 (2.2x2.2mm) AAT3693IDH-AG-T1

TDFN-10 (2.2x2.2mm) AAT3693IDH-AH-T1

TDFN-10 (2.2x2.2mm) 5GXYY AAT3693IDH-AI-T1

TDFN-10 (2.2x2.2mm) 7EXYY AAT3693IDH-AJ-T1

TDFN-10 (2.2x2.2mm) AAT3693IDH-AK-T1

TDFN-10 (2.2x2.2mm) AAT3693IDH-AL-T1

TDFN-10 (2.2x2.2mm) AAT3693IDH-BM-T1

TDFN-10 (2.2x2.2mm) AAT3693IDH-BN-T1

TDFN-10 (2.2x2.2mm) AAT3693IDH-BO-T1

TDFN-10 (2.2x2.2mm) AAT3693IDH-BP-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.

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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.

Packaging Information1

TDFN-10

2.200

0.050

2.200

0.050

Index Area

1.700

0.050

0.900

0.050

Detail "A"

0.500

0.050

0.750

0.050

0.203 REF

Top View Bottom View

Side View

Pin 1 Indicator

(optional)

0.400 BSC

0.180

0.050

0.400

0.050

Detail "A"

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.