PRODUCT DATASHEET
AAT3123/23A/24
ChargePump
TM
High Efficiency 1X/1.5X Fractional Charge Pump for White LED Applications
Pin Descriptions
Pin #
AAT3123/23A
(TSOPJW-12)
1
2
3
4
5
6
7
8
9
10
11
12
AAT3124
(QFN44-16)
10
9
7
6
5
4
1
16
15
14
12
11
2
3
8, 13
EP
AAT3124
(TSOPJW-14)
8
9
10
11
12
13
2
3
4
5
6
7
1
14
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 be-
tween 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 be-
tween 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.
Pin Configuration
TSOPJW-12
(Top View)
QFN44-16
(Top View)
TSOPJW-14
(Top View)
EN/SET
N/C
IN
D1
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
2
3
4
5
6
7
8
12
11
GND
C2-
C2+
OUT
AAT3124
10
9
D5
D2
D1
EN/SET
IN
GND
C2-
1
2
3
4
5
6
7
14
13
12
AAT3124
11
10
9
8
D6
D3
D4
C1+
C1-
OUT
C2+
2
www.analogictech.com
16
15
14
13
C1+
D4
N/C
C1-
3123.2008.03.1.5
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