Pin Descriptions

Pin Configuration

TDFN44-16

(Top View)

VOUT_FL

VIN

D4

C3-

C3+

3

D3

D2

D1

C2+

VOUT_BL

C1-

EN_FLSH

C2-

C1+

EN/SET

GND

4

5

1

2

6

7

8

14

13

12

16

15

11

10

9

Pin #

Symbol

Function

1

C3-

Flying capacitor 3 negative terminal.

2

C3+

Flying capacitor 3 positive terminal. Connect a 1µF capacitor between C3+ and C3-.

3

VOUT_FL

Regulated output voltage for flash LED. Requires 1µF capacitor connected between this

pin and ground.

4

VIN

Input power supply. Requires 1µF capacitor connected between this pin and ground.

5

D4

Current sink input 4.

6

D3

Current sink input 3.

7

D2

Current sink input 2.

8

D1

Current sink input 1.

9

GND

Ground.

10

EN/SET

pump and to control the brightness of the white LEDs.

11

C1+

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

12

C1-

Flying capacitor 1 negative terminal.

13

VOUT_BL

Regulated output voltage for white LED. Requires 1µF capacitor connected between this

pin and ground.

14

C2+

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

15

C2-

Flying capacitor 2 negative terminal.

16

EN_FLSH

Enable/disable pin for the flash charge pump.

EP

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

AAT2805

Dual High Efficiency Charge Pump

for White LED and Flash Applications

2

2805.2006.04.1.7