Pin Description

Pin Configuration

TDFN33-14

(Top View)

EN

ISET

GND

1

TS

BATS

BAT

N/C

ADPP#

STAT2

STAT1

IN

IN

3

4

5

6

7

14

TERM

13

12

11

10

9

8

Pin #

Symbol

Type

Function

1

EN

I

Enable pin, Active high with internal pull-down. If not used, pull high to the IN pin to

continuously enable the charger IC when input power is applied.

2

CT

I

Charge timer programming pin. A 0.1µF ceramic capacitor should be connected

between this pin and GND. Connect directly to GND to disable the timer function.

3

ISET

I

Charge current programming pin. Connect a resistor between this pin and GND to

program the constant fast charge current.

4

GND

I/O

IC ground connection. Connect this pin to power ground.

5

TS

I/O

Battery temperature sense input. Connect the Li-Ion battery pack NTC resistor termi-

nal to this pin.

6

BATS

I

Battery voltage sense pin. Connect this pin directly to the positive battery terminal. If

this function is not used, connect to the BAT pin directly.

7

BAT

O

Battery charge output pin. Connect to the positive battery terminal.

8, 9

IN

I

Power supply input pin. Connect the input USB port or Adapter power source to this pin

10

STAT1

O

Charge status pin, open-drain output. Connect the STAT1 LED with a series ballast

resistor between IN and this pin.

11

STAT2

O

Charge status pin, open-drain output. Connect the STAT2 LED with a series ballast

resistor between IN and this pin.

12

ADPP#

O

Input supply power-good status pin, open-drain output. Connect the ADPP# status

LED with a series ballast resistor between IN and this pin.

13

TERM

I

Charge termination current programming input pin. Connect a resistor between this

pin and GND to program the charge termination current. When TERM is open, the

termination current is 10% (default sertting) of the set maximum charge current.

14

N/C

No connection.

AAT3663

1A Linear Li-Ion Battery Charger

for Single and Dual Cell Applications

2

3663.2007.10.1.0