Pin Descriptions

Pin Configuration

TDFN33-12

(Top View)

VIN

C1+

C1-

1

GND

F1

F2

VIN

VOUT

C2+

C2-

N/C

EN/SET

2

3

4

5

6

12

11

10

9

8

7

Pin #

Symbol

Function

1, 12

VIN

Input power supply pin. Requires 4.7µF bypass capacitor to ground.

2

C1+

Flying capacitor C1 positive terminal. Connect a 1.0µF capacitor between C1+ and C1-.

3

C1-

Flying capacitor C1 negative terminal.

4

GND

Ground connection.

5

F1

Current sink input #1.

6

F2

Current sink input #2.

7

EN/SET

8

N/C

No connection.

9

C2-

Flying capacitor C2 negative terminal.

10

C2+

Flying capacitor C2 positive terminal. Connect a 1µF capacitor between C2+ and C2-.

11

VOUT

Charge pump output. Requires 2.2µF capacitor connected between this pin and ground.

EP

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

AAT3172

High Current LED Flash Driver Charge Pump IC

2

3172.2006.05.1.5