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AAT3170IWP-T1

High Current LED Flash Driver Charge Pump IC

Advanced Analogic Technologies 

ChargePumpTM

PRODUCT DATASHEET

AAT3170

High Current LED Flash Driver Charge Pump IC

General Description

The AAT3170 is a high output current, high efficiency,

low noise, low profile charge pump DC/DC converter,

ideal for multi-function LED photo-flash applications

where solution cost, size, and efficiency are critical.

The dual charge pump in the AAT3170 is capable of

delivering 600mA output current. Two current-controlled

paths are available for users of dual flash LEDs that pre-

fer current matching. Each LED channel can be easily

programmed in 32 steps with a single GPIO output

through the AS2Cwire™ (Advanced Simple Serial

Control™) interface. This allows smooth transitions and

flexible adjustment of brightness in flash or other light-

ing modes.

The tri-mode (1X/1.5X/2X) operation of the internal

charge pump offers excellent power efficiency for both

flash and movie modes. Combined with a low external

parts count (two 1μF flying capacitors and one small

bypass capacitor at VIN and OUT), the AAT3170 is ideally

suited for small, battery-powered applications.

The AAT3170 has a thermal management system to pro-

tect the device in the event of a short-circuit condition at

the output pin. Built-in soft-start circuitry prevents

excessive inrush current during start-up. The shutdown

feature disconnects the load from VIN and reduces quies-

cent current to less than 1.0μA.

The AAT3170 is available in the Pb-free, thermally-

enhanced, 12-pin 3x3mm TDFN package.

Features

• VIN Range: 2.7V to 5.5V

• 600mA Output Current

• Tri-Mode 1X/1.5X/2X in Current Mode

• Voltage Mode Operation: 1.5X, 200mA

• Dual Regulated Current Sinks

• Current Match Between Current Sinks

• 32 Current Steps Set by AS2Cwire

• 1μF Input, Output, and Flying Capacitors

• <1.0μA of Shutdown

• Small Application Circuit

• No Inductors

• Automatic Soft Start

• 12-Pin TDFN 3x3mm Package

• -40°C to +85°C Temperature Range

Applications

• Camera Phones

• Digital Still Cameras (DSCs)

• PDAs and Notebook PCs

• Smart Phones

Typical Application

C1

C2

1μF

1μF

2.7V to 5.5V

C1+ C1- C2+ C2-

VIN

VOUT

CIN

4.7μF

AAT 3170

COUT

2.2μF

Flash

LED 1

EN/SET

CT

0.1μF

EN/SET

F1

CT

F2

GND

Flash

LED 2

3170.2007.11.1.2

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