Datasheet > AAT3151IFP-T1

AAT3151IFP-T1

更新时间： 2022-04-23 23:00:11

品牌	Logo	应用领域
AAT		泵
页数	文件大小	规格书
15页	440K
描述
High Efficiency 1X/1.5X/2X Charge Pump For White LED Applications

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AAT3151IFP-T1 数据手册

AAT3151

High Efficiency 1X/1.5X/2X Charge Pump

For White LED Applications

™

ChargePump

General Description

Features

The AAT3151 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 AAT3151 is capable of

driving four white LEDs at a total of 120mA from a

2.7V to 5.5V input. The current sinks may be oper-

ated individually or in parallel for driving higher-cur-

rent LEDs. A low external parts count (two 1µF fly-

ing capacitors and two small 1µF capacitors at V_IN

and V_OUT) makes the AAT3151 ideally suited for

small battery-powered applications.

•

V_INRange: 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 50µA

— Low I_Q(50µA) for Low-Current Mode

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

Maximum Efficiency and V_FCoverage

Drives Four Channels of LEDs

Individual Main/Sub-Group Control

No Inductors, Low Noise Operation

1MHz Constant Switching Frequency

Small Application Circuit

•

AnalogicTech's AS Cwire™ (Advanced Simple

Built-In Thermal Protection

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 50µA for optimized efficiency, with

a low housekeeping current of only 50µA.

Built-In Auto-Disable for Short-Circuit

Automatic Soft Start

I_Q<1µA in Shutdown

TDFN33-12 or STDFN33-12 Package

The charge pump output of the AAT3151 is

equipped with built-in protection for V_OUT. Each

current sink input has short-circuit and auto-disable

to guard against LED failure conditions. Built-in

soft-start circuitry prevents excessive inrush cur-

rent during start-up. A low-current shutdown fea-

ture disconnects the load from V_INand reduces

quiescent current to less than 1µA.

Applications

•

Color (RGB) Lighting

Programmable Current Sinks

White LED Backlighting

White Photo Flash for Digital Still Cameras

The AAT3151 is available in a Pb-free, space-saving,

thermally-enhanced, 12-pin 3x3mm TDFN package,

or in the lower-profile STDFN package.

Typical Application

VIN

2.7V to 5.5V

C1+

1µF

C1-

C2+

1µF

AAT3151

C2-

MAIN

SUB

VOUT

C_OUT

1µF

EN/SET

GND

3151.2007.03.1.10

12 3 4 5 6 7...15

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