AAT3123ITP-20-T1 View Datasheet(PDF) - Advanced Analogic Technologies
Part Name
Description
MFG CO.
AAT3123ITP-20-T1
Advanced Analogic Technologies
'AAT3123ITP-20-T1' PDF : 19 Pages View PDF
PRODUCT DATASHEET
AAT3123/23A/24
ChargePumpTM High Efficiency 1X/1.5X Fractional Charge Pump for White LED Applications
Additional Application Circuits (continued)
VBATTERY
VIN
C1+
C1
1μF
VOUT
C1-
C2+
CIN
1μF
COUT
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).
VBATTERY
VIN
C1+
CIN
COUT
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:
RB
=
VSOURCE
IF
-
VF
AAT3124 Driving a High-Current Photo-Flash LED.
14
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3123.2008.03.1.5
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