AAT3169ISN-T1(2006) 데이터 시트보기 (PDF) - Advanced Analogic Technologies

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AAT3169ISN-T1
(Rev.:2006)

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

Advanced Analogic Technologies 

General Description

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 VIN and VOUT)

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, 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 settings require only 65µA of house-

keeping current.

Each output of the AAT3169 is equipped with built-

in protection for VOUT short-circuit and auto-disable

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

circuitry prevents excessive inrush current during

start-up. A low-current shutdown feature discon-

nects the load from VIN and reduces quiescent cur-

rent to less than 1µA.

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

ing, thermally-enhanced 16-pin 3x4mm TDFN or

4x4mm QFN package.

Typical Application

AAT3169

High Efficiency 1X/1.5X/2X Charge

Pump for White LED Applications

Features

ChargePump™

• VIN Range: 2.7V to 5.5V

• Fully Programmable Current with Single Wire

— 16-Step Logarithmic Scale

— 20/30/15mA 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 TDFN34-16 or

QFN44-16 Package

Applications

• Color (RGB) Lighting

• Programmable Current Sink

• White LED Backlighting

• White Photo Flash for Digital Still Cameras

C1+

C2+

C1

1μF

C1-

C2-

2.7V to 5.5V

EN/SET

VIN

VOUT

CIN

1μF

AAT3169

GND

D1

D2

EN/SET

D3

D4

D5

D6

C2

1μF

D1 D2 D3 D4 D5

D6

COUT

1μF

3169.2006.04.1.0

1

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