High Current, High Efficiency Charge Pump
Pin Descriptions
Pin #
1
2
3
4
5
6
7
AAT3174
Symbol
VIN
C1+
C1-
GND
FL
RSET
EN/SET
Function
Input power supply pin. Requires 4.7µF bypass capacitor to ground.
Flying capacitor C1 positive terminal. Connect a 1µF capacitor between C1+ and C1-.
Flying capacitor C1 negative terminal.
Ground connection.
Controlled current sink. Connect the flash LED cathode to this pin.
Connect resistor here to set maximum output current.
Charge pump enable / set input control pin. When in the low state, the AAT3174 is
powered down and consumes less than 1µA. When connected to logic high level,
the AAT3174 charge pump is active. This pin should not be left floating.
Not connected.
Flying capacitor C2 negative terminal.
Flying capacitor C2 positive terminal. Connect a 1µF capacitor between C2+ and C2-.
Charge pump output. Requires 2.2µF bypass capacitor to ground. Connect to flash LED
anode to drive the LED.
Input power supply pin. Requires 4.7µF bypass capacitor to ground.
Exposed paddle (bottom). Connect to GND directly beneath package.
8
9
10
11
12
EP
N/C
C2-
C2+
OUT
VIN
Pin Configuration
TDFN33-12
(Top View)
VIN
C1+
C1-
GND
FL
RSET
1
2
3
4
5
6
12
11
10
9
8
7
VIN
OUT
C2+
C2-
N/C
EN/SET
2
3174.2006.05.1.2
ANALOGICTECH [ ADVANCED ANALOGIC TECHNOLOGIES ]
