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AAT3132ITP-1-T1 Datasheet(PDF) 7 Page - Advanced Analogic Technologies

Part # AAT3132ITP-1-T1
Description  High Efficiency 1.5X Fractional Charge Pump for White LED Applications
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Manufacturer  ANALOGICTECH [Advanced Analogic Technologies]
Direct Link  http://www.analogictech.com
Logo ANALOGICTECH - Advanced Analogic Technologies

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AAT3132/32A
High Efficiency 1.5X Fractional Charge
Pump for White LED Applications
3132.2005.12.1.4
7
Functional Block Diagram
1.5X
Charge
Pump
Soft-Start
Control
1MHz
Oscillator
Voltage
Reference
Quad
Output
DAC
Single
Output
DAC
Current
Reference
S2Cwire
Interface
32x16 bit
ROM
C1+
C1-
C2+
C2-
OUT
D1
D2
D3
D4
GND
EN/SET
VIN
32x16 bit
ROM
Functional Description
The AAT3132/32A is a high efficiency (1.5X) frac-
tional charge pump device intended for white LED
backlight applications. It consists of a 1.5X charge
pump with multiple current source outputs. To max-
imize power conversion efficiency, an internal feed-
back control sensing circuit monitors the voltage
required on the constant current source outputs.
The AAT3132/32A requires only four external
components: two 1µF ceramic capacitors for the
charge pump flying capacitors (C
1 and C2), one
1µF ceramic input capacitor (C
IN),
and one
0.33µF to 1µF ceramic output capacitor (C
OUT).
The 1.5X charge pump output is converted into
three (D1 to D3) constant current outputs to drive
three individual LEDs with a maximum current of
20mA each, and one (D4) constant current output
with a maximum current of 25 or 30mA. The cur-


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