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AAT3112

500mA High Efficiency Charge Pump

for White LED Flash Applications

General Description

The AAT3112 is a member of AnalogicTech's Total

Power Management IC鈩?(TPMIC鈩? family. It is a

dual voltage doubling charge pump that provides a

regulated output voltage. It operates with an input

voltage range of 2.7 to 5.0 volts. The device can

deliver a constant 200mA output load current and up

to 500mA of pulsed current. The 500mA peak cur-

rent capability of the AAT3112 makes it ideal for

white LED flash applications. A low external parts

count (two 1碌F flying capacitors and two small

capacitors at V

IN

and V

OUT

) makes the AAT3112 ide-

ally suited for small battery-powered applications.

The AAT3112 has a thermal management system

to protect the device in the event of a short-circuit

condition at the output pin. Built-in soft-start circuit-

ry prevents excessive inrush current during start-

up. A high charge pump switching frequency

enables the use of very small external capacitors.

A low current shutdown feature disconnects the

load from V

IN

and reduces quiescent current to less

than 1碌A(chǔ). The AAT3112 is available in a 16-pin

3x3mm QFN package and is rated over the -40擄C

to +85擄C temperature range.

Features

鈥?/div>

ChargePump

鈩?/div>

鈥?/div>

Input Voltage Range:

鈥?AAT3112-5.0: 2.7V to 5.0V

鈥?AAT3112-4.5: 2.7V to 4.5V

Up to 500mA Peak Output Current

200mA Continuous Output Current

I

Q

<1碌A(chǔ) in Shutdown

Regulated 4.5V or 5.0V Output

26碌A(chǔ) of Quiescent Current

Small Application Circuit

Automatic Soft Start

No Inductors

Short-Circuit/Over-Temperature Protection

16-Pin 3x3mm QFN Package

Temperature Range: -40擄C to +85擄C

Applications

鈥?/div>

General-Purpose High-Current Boost Supply

White LED Backlighting

White LED Photo Flash

Typical Application

C1 = 1碌F

C2 = 1碌F

C1

+

C1

-

C2

+

C2

-

V

OUT1

V

IN

C

IN

V

IN

V

OUT2

C

OUT

AAT3112

D1

Enable Light

EN1

D2

D3

D4

Enable Flash

EN2

GND

R

B

3112.2004.12.1.2

1

型號(hào)

版本

描述

廠商

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AAT3112IVN-5.0-T1 Datasheet

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