AAT3123(2003) データシートの表示（PDF） - Advanced Analogic Technologies
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AAT3123
(Rev.:2003)
(Rev.:2003)
Advanced Analogic Technologies
AAT3123 Datasheet PDF : 18 Pages
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AAT3123/4
High Efficiency 1X/1.5X Fractional Charge
Pump for White LED Applications
Additional Application Circuits
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
RB
RB
RB
RB
Resistor R is optional
D5
D6
RB
RB
Resistor R is optional
AAT3124 Driving Two Groups of Paralleled White LED's (e.g. main-LCD & 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
RB*
RB*
RB*
RB*
RB*
RB*
Photo Flash LED
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 High Current Photo-Flash LED
14
3123.2003.09.1.1
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