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

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AAT3132ITP-1-T1

High Efficiency 1.5X Fractional Charge Pump for White LED Applications

Analog Technology Inc 

AAT3132/32A

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 AAT3132/32A 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 (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) 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-

3132.2005.12.1.4

7

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