AAT3123/23A/24
High Efficiency 1X/1.5X Fractional Charge
Pump for White LED Applications
Pin Descriptions
Pin #
AAT3123/23A
(TSOPJW-12)
AAT3124
(QFN44-16)
Symbol
C2+
OUT
C1-
C1+
D4
D3
D2
D1
EN/SET
IN
GND
C2-
D5
D6
N/C
Function
Flying capacitor 2 positive terminal. Connect a 1µF capacitor
between C2+ and C2-.
Charge pump output. Requires 1µF capacitor connected
between this pin and ground.
Flying capacitor 1 negative terminal.
Flying capacitor 1 positive terminal. Connect a 1µF capacitor
between C1+ and C1-.
Current source output #4.
Current source output #3.
Current source output #2.
Current source output #1.
Control pin using S
2
Cwire serial interface.
Input power supply. Requires 1µF capacitor connected between
this pin and ground.
Ground.
Flying capacitor 2 negative terminal.
Current source output #5.
Current source output #6.
No connection.
Exposed paddle (bottom); connect to GND directly beneath
package.
1
2
3
4
5
6
7
8
9
10
11
12
10
9
7
6
5
4
1
16
15
14
12
11
2
3
8, 13
EP
Pin Configuration
TSOPJW-12
(Top View)
QFN44-16
(Top View)
EN/SET
15
N/C
IN
14
13
D1
16
C2+
OUT
C1-
C1+
D4
D3
1
2
3
4
5
6
12
11
AAT3123
AAT3123A
10
9
8
7
C2-
GND
IN
EN/SET
D1
D2
D2
D5
D6
D3
1
12
GND
C2-
C2+
OUT
2
11
AAT3124
3
10
4
5
6
7
8
9
C1+
D4
N/C
C1-
2
3123.2005.12.1.4
ANALOGICTECH [ ADVANCED ANALOGIC TECHNOLOGIES ]
