AAT3132ITP-1-T1(2004) データシートの表示（PDF） - Analog Technology Inc

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AAT3132ITP-1-T1
(Rev.:2004)

High Efficiency 1.5X Fractional Charge Pump for White LED Applications

Analog Technology Inc 

AAT3132

High Efficiency 1.5X Fractional Charge

Pump for White LED Applications

Functional Block Diagram

VIN

Soft Start

Control

1MHz

Oscillator

Voltage

Reference

1.5x

Charge

Pump

C1+

C1-

C2+

C2-

OUT

EN/SET

S2Cwire

Interface

Current

Reference

32x16 bit

ROM

32x16 bit

ROM

D1

Quad

D2

Output

DAC

D3

Single

D4

Output

DAC

GND

Functional Description

The AAT3132 is a high efficiency (1.5X) fractional

charge pump device intended for white LED back

light applications. It consists of a 1.5X charge pump

with multiple current-source outputs. To maximize

power conversion efficiency an internal feedback

control sensing circuit monitors the voltage required

on the constant current source outputs.

The AAT3132 requires only four external compo-

nents: two 1µF ceramic capacitors for the charge

pump flying capacitors (C1 and C2), one 1µF

ceramic input capacitor (CIN) and one 0.33µF to 1µF

ceramic output capacitor (COUT). The 1.5X charge

pump output is converted into three (D1 to D3) con-

stant current outputs to drive three individual LEDs

with a maximum current of 20mA each, and one

(D4) constant current output with a maximum cur-

rent of 25 or 30mA. The current source output mag-

nitude is controlled by the EN/SET serial data inter-

face. The interface records rising edges of the

EN/SET pin, and decodes them into 32 addresses

corresponding to individual current level settings.

3132.2004.04.1.0

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