Datasheet > AAT3151B_08

AAT3151B_08

更新时间： 2022-04-23 23:00:11

品牌	Logo	应用领域
ANALOGICTECH		泵
页数	文件大小	规格书
13页	291K
描述
High Efficiency 1X/1.5X Charge Pump For White LED Applications

阅读下载

获取价格

数据手册

如果您发现信息不准确，欢迎纠错

AAT3151B_08 数据手册

PRODUCT DATASHEET

AAT3151B

ChargePump

High Efficiency 1X/1.5X Charge Pump For White LED Applications

General Description

Features

The AAT3151B is a low noise, constant frequency charge

pump DC/DC converter that uses a dual mode load

switch (1X) and fractional (1.5X) charge pump conver-

sion to maximize efficiency for white LED applications.

The AAT3151B 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 operated individually or in parallel for driv-

ing higher-current LEDs. A low external parts count (two

1μF flying capacitors and two small 1μF capacitors at V_IN

and V_OUT) makes the AAT3151B 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

▪

• Dual Mode 1X and 1.5X Charge Pump for Maximum

Efficiency and V_FCoverage

• Drives Four Channels of LEDs

• No Inductors, Low Noise Operation

• 1MHz Constant Switching Frequency

• Small Application Circuit

• Built-In Thermal Protection

• Built-In Auto-Disable for Short-Circuit

• Automatic Soft Start

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.

• I_Q<1μA in Shutdown

• TDFN33-12 Package

The charge pump output of the AAT3151B 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 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

• White Photo Flash for Digital Still Cameras

The AAT3151B is available in a Pb-free, space-saving,

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

Typical Application

VIN

2.7V to 5.5V

C1+

1μF

C1-

1μF

C2+

1μF

AAT3151B

C2-

VOUT

C_OUT

1μF

EN/SET

GND

w w w . a n a l o g i c t e c h . c o m

3151B.2008.02.1.1

12 3 4 5 6 7...13

下载PDF

与AAT3151B_08相关器件

型号	品牌	描述	获取价格	数据表
AAT3151BIWP-T1	ANALOGICTECH	High Efficiency 1X/1.5X Charge Pump For White LED Applications	获取价格
AAT3151DFN33-12	ANALOGICTECH	Interface Circuit,	获取价格
AAT3151IFP-T1	AAT	High Efficiency 1X/1.5X/2X Charge Pump For White LED Applications	获取价格
AAT3151IWP-T1	ANALOGICTECH	High Efficiency 1X/1.5X/2X Charge Pump For White LED Applications	获取价格
AAT3151IWP-T1	AAT	High Efficiency 1X/1.5X/2X Charge Pump For White LED Applications	获取价格
AAT3152	AAT	High Efficiency 1X/1.5X/2X Charge Pump For White LED Applications	获取价格