AAT3122
High Efficiency 1X/1.5X Fractional Charge
Pump for White LED Applications
Pin Descriptions
Pin #
1
2
3
4
5, 6, 7, 8
9
10
11
12
Symbol
C2+
OUT
C1-
C1+
D
EN/SET
IN
GND
C2-
Function
Flying capacitor 2 positive terminal. Connect a 1µF capacitor between C2+ and C2-.
Charge pump output. Requires 1µF bypass capacitor to ground.
Flying capacitor 1 negative terminal.
Flying capacitor 1 positive terminal. Connect a 1µF capacitor between C1+ and C1-.
Output current source with drive capability of up to 120mA.
Input control pin. Serial data interface that controls the level of output current. See
Application Information for more details.
Input power supply. Requires 1µF bypass capacitor to ground.
Ground.
Flying capacitor 2 negative terminal.
Pin Configuration
TSOPJW-12
(Top View)
C2+
OUT
C1-
C1+
D
D
1
2
3
4
5
6
12
11
10
9
8
7
C2-
GND
IN
EN/SET
D
D
2
3122.2005.11.1.3
AAT [ ADVANCED ANALOG TECHNOLOGY, INC. ]
