Pin Descriptions

Pin Configuration

QFN33-16

(Top View)

V

OUT1

V

IN

GND

N/C

C2+

C2-

1

2

3

4

12

11

10

9

EN1

N/C

Pin #

Symbol

Function

1

N/C

No connect.

2

C2+

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

3

C2-

Flying capacitor 2 negative terminal.

4

N/C

No connect.

5V

IN

Input voltage. Connect to Pin 11.

6

GND

Ground connection.

7

EN2

Enable pin. When connected high, Charge Pump 2 is enabled. When connected low, it

disables the charge pump.

8

N/C

No connect.

9

EN1

Enable pin. When connected high, Charge Pump 1 is enabled. When connected low, it

disables the charge pump.

10

GND

Ground connection.

11

V

IN

Input voltage. Connect to Pin 5.

12

V

OUT1

Output pin for regulated output voltage. Bypass this pin to ground with a low ESR 10µF

capacitor.

13

N/C

No connect.

14

C1+

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

15

C1-

Flying capacitor 1 negative terminal.

16

V

OUT2

Regulated output voltage 2. Must be connected to V

If used separately, bypass this pin to ground with a low ESR 10µF capacitor.

EP

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

AAT3112

500mA High Efficiency Charge Pump

for White LED Flash Applications

2

3112.2004.12.1.2