Datasheet > AAT3156ISN-T1

AAT3156ISN-T1

更新时间： 2024-02-14 13:49:25

品牌	Logo	应用领域
AAT		泵
页数	文件大小	规格书
14页	336K
描述
High Efficiency 1X/1.5X/2X Charge Pump For White LED Applications

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AAT3156ISN-T1 技术参数

是否Rohs认证：	符合	生命周期：	Transferred
包装说明：	,	Reach Compliance Code：	unknown
风险等级：	5.67	湿度敏感等级：	1
Base Number Matches：	1

AAT3156ISN-T1 数据手册

AAT3156

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

For White LED Applications

™

ChargePump

General Description

Features

The AAT3156 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 AAT3156 is capable of

driving six LED channels at a total of 180mA from

a 2.7V to 5.5V input. The current sinks may be

operated individually or in parallel for driving high-

er-current LEDs. A low external parts count (two

1µF flying capacitors and two small 1µF capacitors

at V_INand V_OUT) make this part 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 Six Channels of LEDs

Individual Main/Sub-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

I_Q<1µA in Shutdown

Thermally-Enhanced QFN44-16 Package

•

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 50µA for optimized efficiency, with

a low housekeeping current of only 50µA.

Each output of the AAT3156 is equipped with built-in

protection for V_OUTshort circuit and auto-disable for

LED failure conditions. Built-in soft-start circuitry pre-

vents excessive inrush current during start-up. A low-

current shutdown feature disconnects the load from

V_INand reduces quiescent current to less than 1µA.

Applications

•

Color (RGB) Lighting

Programmable Current Sinks

White LED Backlighting

The AAT3156 is available in a Pb-free, space-saving,

thermally-enhanced 16-pin 4x4mm QFN package.

White Photo Flash for Digital Still Cameras

Typical Application

VIN

2.7V to 5.5V

C1+

1µF

C_IN

1µF

C1-

C2+

1µF

AAT3156

C2-

VOUT

C_OUT

1µF

EN/SET

GND

3156.2005.09.1.2

12 3 4 5 6 7...14

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