AAT3122

High Efficiency 1X/1.5X Fractional Charge

Pump for White LED Applications

2

3122.2005.11.1.3

Pin Descriptions

Pin Configuration

TSOPJW-12

(Top View)

1

2

3

4

5

6

12

11

10

9

8

7

C2+

OUT

C1-

C1+

D

D

C2-

GND

IN

EN/SET

D

D

Pin #

Symbol

Function

1

C2+

Flying capacitor 2 positive terminal. Connect a 1µF capacitor between C2+ and C2-.

2

OUT

Charge pump output. Requires 1µF bypass capacitor to ground.

3

C1-

Flying capacitor 1 negative terminal.

4

C1+

Flying capacitor 1 positive terminal. Connect a 1µF capacitor between C1+ and C1-.

5, 6, 7, 8

D

Output current source with drive capability of up to 120mA.

9

EN/SET

Input control pin. Serial data interface that controls the level of output current. See

Application Information for more details.

10

IN

Input power supply. Requires 1µF bypass capacitor to ground.

11

GND

Ground.

12

C2-

Flying capacitor 2 negative terminal.