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AAT3151BIWP-T1 PDF预览

AAT3151BIWP-T1

更新时间: 2024-02-03 04:31:03
品牌 Logo 应用领域
ANALOGICTECH 驱动程序和接口接口集成电路
页数 文件大小 规格书
15页 266K
描述
High Efficiency 1X/1.5X Charge Pump For White LED Applications

AAT3151BIWP-T1 技术参数

生命周期:Obsolete包装说明:,
Reach Compliance Code:unknownECCN代码:EAR99
HTS代码:8542.39.00.01风险等级:5.75
Is Samacsys:N接口集成电路类型:LED DISPLAY DRIVER
Base Number Matches:1

AAT3151BIWP-T1 数据手册

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AAT3151B  
High Efficiency 1X/1.5X Charge Pump  
For White LED Applications  
ChargePump  
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 conversion 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 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 VIN  
and VOUT) makes the AAT3151B ideally suited for  
small battery-powered applications.  
VIN Range: 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 IQ (50µA) for Low-Current Mode  
Dual Mode 1X and 1.5X Charge Pump for  
Maximum Efficiency and VF Coverage  
Drives Four Channels of LEDs  
No Inductors, Low Noise Operation  
1MHz Constant Switching Frequency  
Small Application Circuit  
Built-In Thermal Protection  
2
AnalogicTech's AS Cwire™ (Advanced Simple  
Built-In Auto-Disable for Short-Circuit  
Automatic Soft Start  
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.  
IQ <1µA in Shutdown  
TDFN33-12 Package  
The charge pump output of the AAT3151B is  
equipped with built-in protection for VOUT. 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 VIN and 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+  
C1  
1μF  
C
IN  
1μF  
C1-  
C2+  
C2  
1μF  
AAT3151B  
C2-  
VOUT  
COUT  
1μF  
D1  
D2  
D3  
D4  
EN/SET  
D1  
D2  
D3  
D4  
EN/SET  
GND  
3151B.2007.09.1.0  
1

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