AAT3167IFO-T1 Advanced Analog Technology, Inc., AAT3167IFO-T1 Datasheet

AAT3167IFO-T1

Manufacturer Part Number

AAT3167IFO-T1

Description

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

Manufacturer

Advanced Analog Technology, Inc.

Datasheet

1.AAT3167IFO-T1.pdf (14 pages)

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General Description

The AAT3167 is a low noise, constant frequency

charge pump DC/DC converter that uses a tri-

mode load switch (1X), fractional (1.5X), and dou-

bling (2X) conversion to maximize efficiency for

white LED applications. The AAT3167 is capable of

driving five LEDs for a total of 135mA from a 2.7V

to 5.5V input. The current sinks may be operated

individually 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-powered applications.

AnalogicTech's AS

Serial Control™) serial digital input is used to enable,

disable, 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 50µA of housekeeping current.

Each output of the AAT3167 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 AAT3167 is available in a Pb-free, space-sav-

ing, thermally-enhanced, 14-pin 3x3mm STDFN or

16-pin 4x4mm QFN package and is rated over the

-40°C to +85°C temperature range.

Typical Application

3167.2007.03.1.4

2.7V to 5.5V

Cwire™ (Advanced Simple

EN/SET

1µF

GND

C1+

C1-

EN/SET

AAT3167

OUTCP

C2+

C2-

1µF

High Efficiency 1X/1.5X/2X Charge

Pump for White LED Applications

Features

•

Applications

•

Fully Programmable Current with Single Wire

— 16-Step Logarithmic Scale

— 14/18/27mA Max Current

— Four Low-Current Settings Down to 115µA

— Low I

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

Maximum Efficiency and V

Drives Up to Five LEDs

Individual Main-Sub (4-1) 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

STDFN33-14 or QFN44-16 Package

Color (RGB) Lighting

Programmable Current Sink

Transmissive LCD Display

White LED Backlighting

White Photo Flash for Digital Still Cameras

<1µA in Shutdown

Range: 2.7V to 5.5V

Current Mode

(50µA) for Single-Channel, Low-

ChargePump

1µF

OUT

Coverage

™

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