AAT3131ITP-T1 View Datasheet(PDF) - Advanced Analogic Technologies
Part Name
Description
MFG CO.
AAT3131ITP-T1
Advanced Analogic Technologies
'AAT3131ITP-T1' PDF : 14 Pages View PDF
AAT3131
High Efficiency 1X/1.5X Fractional
Charge Pump for White LED Applications
Additional Application Circuit
VBATTERY
VIN
C1+
C1
1µF
D1
D2
D3
D4
VOUT
C1-
C2+
CIN
1µF
COUT
1µF
AAT3131
C2
1µF
RB*
RB*
RB*
RB*
C2-
D1
D2
D3
EN/SET
EN/SET D4
GND
D5
D6
RB*
RB*
*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
AAT3131 Driving Two Groups of Paralleled White LED's (e.g. main-LCD & sub-LCD backlights)
3131.2004.08.1.1
13
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