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AAT3169IFO-T1

High Efficiency 1X/1.5X/2X Charge Pump for White LED Applications

Analog Technology Inc 

AAT3169

High Efficiency 1X/1.5X/2X Charge

Pump for White LED Applications

General Description

Features

ChargePump™

The AAT3169 is a low noise, constant frequency

charge pump DC/DC converter that uses a tri-mode

load switch (1X), fractional (1.5X), and doubling

(2X) conversion to maximize efficiency for white

LED applications. The AAT3169 is capable of driv-

ing six LEDs for a total of 180mA from a 2.7V to

5.5V input. The current sinks may be operated indi-

vidually or in parallel for driving higher current LEDs.

A low external parts count (two 1µF flying capacitors

and two small 1µF capacitors at IN and OUTCP)

make this part ideally suited for small, battery-pow-

ered applications.

AnalogicTech's AS2Cwire™ (Advanced Simple Serial

Control™) serial digital input is used to enable, dis-

able, and set current for each LED with a 16-level

logarithmic scale plus four low-current settings down

to 115µA. For optimized efficiency, low-current set-

tings require only 65µA of housekeeping current.

Each output of the AAT3169 is equipped with built-

in protection for output short-circuit and auto-dis-

able for load short-circuit conditions. Built-in soft-

start circuitry prevents excessive inrush current

during start-up. A low-current shutdown feature dis-

connects the load from the input and reduces qui-

escent current to less than 1µA.

The AAT3169 is available in a Pb-free, space-sav-

ing, thermally-enhanced 16-pin 4x4mm QFN pack-

age or a low-profile 14-pin 3x3mm STDFN pack-

age and is rated over the -40°C to +85°C tempera-

ture range.

• VIN Range: 2.7V to 5.5V

• Fully Programmable Current with Single Wire

— 16-Step Logarithmic Scale

— 15/20/30mA Max Current

— Four Low-Current Settings Down to 115µA

— Low IQ (65µA) for Single-Channel, Low-

Current Mode

• Tri-Mode 1X, 1.5X, and 2X Charge Pump for

Maximum Efficiency and VF Coverage

• Drives Up to Six LEDs

• Individual Main-Sub (5-1) Group Control

• No Inductors, Low Noise Operation

• 1MHz Constant Switching Frequency

• Small Application Circuit

• Built-In Thermal Protection

• Built-In Auto-Disable for Open Circuit

• Automatic Soft Start

• IQ <1µA in Shutdown

• Thermally-Enhanced STDFN33-14 or

QFN44-16 Package

Applications

• Color (RGB) Lighting

• Programmable Current Sink

• Transmissive Displays

• White LED Backlighting

• White Photo Flash for Digital Still Cameras

Typical Application

C1

1µF

2.7V to 5.5V

CIN

1µF

EN/SET

C1+

C2+

C1-

C2-

OUTCP

IN

AAT3169

D1

D2

D3

EN/SET

D4

D5

D6

C2

1µF

Main

Sub

COUT

1µF

D1 D2 D3 D4 D5 D6

3169.2006.08.1.2

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