AAT3687

Lithium-Ion/Polymer Battery Charger

PRODUCT DATASHEET

2

3687.2008.04.1.12

www .analogictech.com

AAT3687

Lithium-Ion/Polymer Battery Charger

PRODUCT DATASHEET

2

3687.2008.04.1.12

www .analogictech.com

Pin Descriptions

Pin #

Name

Type

Function

1

BAT

Out

Battery charging and sensing.

2

ADP

In

Adapter input.

3

GND

Ground

Ground connection.

4EN

In

AAT3687: Enable pin. Logic high enables the IC.

AAT3687-1, AAT3687-2: Enable pin. Logic high enables the IC. EN tied to internal 4MΩ pull-up

resistor to ADP.

5

ADPP#

Out

Adapter present indicator. This pin is open drain until ADP pin reaches threshold.

6

TS

In/Out

Connect to 10kΩ NTC thermistor.

7

DATA

Out

Status report to microcontroller via serial interface: open drain.

8

STAT2

Out

Battery charge status indicator pin to drive an LED: active low, open drain.

9

STAT1

Out

Battery charge status indicator pin to drive an LED: active low, open drain.

10

CT

In/Out

Timing capacitor to adjust internal watchdog timer. Set maximum charge time for adapter pow-

ered trickle, CC, and CV charge modes. If timing function is not needed, terminate this pin to

ground.

11

N/C

No connection.

12

ADPSET

In/Out

Use resistor at this pin to set adapter charging current.

EP

Exposed paddle (bottom); connect to GND directly beneath package.

Pin Configuration

TDFN33-12

(Top View)

BAT

ADP

GND

1

EN

ADPP#

TS

ADPSET

N/C

CT

STAT1

STAT2

DATA

2

3

4

5

6

12

11

10

9

8

7