Six-Channel White LED Backlight
Charge Pump with Flash
Pin Descriptions
Pin #
1
2
3
4, 14
5
6, 7, 23
8
9
10
11
12
13, 15, 24
16
17
18
19
20
21
22
EP
AAT2803
Symbol
C1-
C1+
VOUT_FL
VIN
EN_FL
N/C
VOUT_BL
C2+
C3+
C3-
C2-
GND
D1
D2
D3
D5
D4
D6
EN/SET
Function
Flying capacitor 1 negative terminal.
Flying capacitor 1 positive terminal. Connect a 1μF capacitor between C1+ and C1-.
Flash output voltage. Requires 1μF capacitor connected between this pin and ground.
Input power supply. Requires 1μF capacitor connected between this pin and ground.
Enable pin for flash charge pump. For normal operation, connect to V
IN
. When con-
nected low, the flash charge pump shuts down and consumes less than 1μA of current.
No connect.
Backlight output voltage charge pump. Requires 1μF capacitor connected between this
pin and ground.
Flying capacitor 2 positive terminal. Connect a 1μF capacitor between C2+ and C2-.
Flying capacitor 3 positive terminal. Connect a 1μF capacitor between C3+ and C3-.
Flying capacitor 3 negative terminal.
Flying capacitor 2 negative terminal.
Ground.
Current sink input #1.
Current sink input #2.
Current sink input #3.
Current sink input #5.
Current sink input #4.
Current sink input #6.
AS
2
Cwire serial interface control pin for backlight charge pump. It controls the current
settings for all six channels. This pin should not be left floating.
Exposed paddle (bottom); connect to GND directly beneath package.
Pin Configuration
QFN44-24
(Top View)
D5
D4
D6
EN/SET
N/C
GND
24
23
22
21
20
19
C1-
C1+
VOUT_FL
VIN
EN_FL
N/C
1
2
3
4
5
6
18
17
AAT2803
16
15
14
13
D3
D2
D1
GND
VIN
GND
10
11
12
7
8
9
C2-
C3-
C3+
C2+
VOUT_BL
N/C
2
2803.2006.12.1.6
AAT [ ADVANCED ANALOG TECHNOLOGY, INC. ]
