AAT3123 Datasheet, PDF (14/18 Pages) List of Unclassifed Manufacturers – High Efficiency 1X/1.5X Fractional Charge Pump for White LED Applications

AAT3123/23A/24
High Efficiency 1X/1.5X Fractional Charge
Pump for White LED Applications
V_BATTERY
VIN
C1+
C1
1µF
VOUT
C1-
C2+
C_IN
1µF
C_OUT
1µF
AAT3124
C2
1µF
C2-
EN/SET
D1
D2
D3
D4
EN/SET
D5
D6
GND
D1
D2
D3
D4
RB1
RB2
RB3
RB4
Resistor R is optional
D5
D6
RB5
RB6
Resistor R is optional
AAT3124 Driving Two Groups of Paralleled White LEDs (e.g., main and sub-LCD backlights).
V_BATTERY
VIN
C1+
C_IN
C_OUT
1µF
1µF
EN/SET
VOUT
C1-
C2+
AAT3124
C2-
D1
D2
D3
D4
EN/SET
D5
D6
GND
C1
1µF
C2
1µF
D1
D2
D3
D4
D5
D6
RB1*
RB2*
Photo-Flash LED
RB3*
RB4*
RB5*
RB6*
Resistor R is optional
*In some applications, white LED forward voltages (VF) can vary significantly. Ballast resistors between the LED cathodes and ground are recommended
for balancing the forward voltage differences. The ballast resistor value may be approximated by the following equation:
R_B
=
VSOURCE
IF
-
VF
AAT3124 Driving a High-Current Photo-Flash LED.
14
3123.2005.12.1.4