AAT3112IVN-5.0-T1 データシートの表示（PDF） - Analog Technology Inc

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AAT3112IVN-5.0-T1

500mA High Efficiency Charge Pump for White LED Flash Applications

Analog Technology Inc 

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™ (TPMIC™) 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 1µF flying capacitors and two small

capacitors at VIN and VOUT) 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 VIN and reduces quiescent current to less

than 1µA. The AAT3112 is available in a 16-pin

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

to +85°C temperature range.

Features

ChargePump™

• Input Voltage Range:

• AAT3112-5.0: 2.7V to 5.0V

• AAT3112-4.5: 2.7V to 4.5V

• Up to 500mA Peak Output Current

• 200mA Continuous Output Current

• IQ <1µA in Shutdown

• Regulated 4.5V or 5.0V Output

• 26µA of Quiescent Current

• Small Application Circuit

• Automatic Soft Start

• No Inductors

• Short-Circuit/Over-Temperature Protection

• 16-Pin 3x3mm QFN Package

• Temperature Range: -40°C to +85°C

Applications

• General-Purpose High-Current Boost Supply

• White LED Backlighting

• White LED Photo Flash

Typical Application

VIN

CIN

Enable Light

Enable Flash

C1 = 1µF C2 = 1µF

C1+ C1- C2+ C2-

VIN

VOUT1

VOUT2

AAT3112

EN1

EN2

GND

C OUT

D1

D2

D3

D4

RB

3112.2004.12.1.2

1

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