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GRM21BR71A225KA01 PDF预览

GRM21BR71A225KA01

更新时间： 2024-11-21 01:06:59
品牌 Logo 应用领域
思佳讯 - SKYWORKS /
页数 文件大小 规格书
17页 2053K
描述
1.5A Single Flash LED Driver IC

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GRM21BR71A225KA01 数据手册

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DATA SHEET  
AAT1274  
1.5A Single Flash LED Driver IC  
General Description  
Features  
•
•
•
•
•
•
•
The AAT1274 is a high-efficiency, 1.5A high-current  
boost converter for LED photo flash applications. It  
maintains output current regulation by switching the  
internal high-side and low-side switch transistors, pulse-  
width modulated at a fixed frequency of 2MHz. The high  
switching frequency allows the use of a small external  
inductor and output capacitor, making the AAT1274 ide-  
ally suited in all single cell, Li-ion-powered applications.  
Input Voltage Range: 2.7V to 5.5V  
Single Channel Flash Output  
Up to 1.5A Regulated Output Current  
Up to 88% Efficiency  
2 MHz Switching Frequency  
Separate Flash Enable  
Single Resistor Sets Flash and Movie Mode Current  
AS2Cwire Single Wire Programming:  
▪
•
Movie Mode Current  
Skyworks' proprietary AS2Cwire™ (Advanced Simple  
Serial Control™) serial digital interface is used to enable,  
disable, configure, and program the operation of the  
AAT1274. Using the AS2Cwire interface, the movie-mode  
current level for each LED, and the flash-to-movie-mode  
current ratio can be programmed to one of 16 levels. The  
AAT1274 includes a separate Flash Enable input to initi-  
ate the flash operation and a Flash Inhibit pin which  
reduces the flash current to movie-mode levels during  
high battery demand.  
•
Flash/Movie Mode Current Ratio  
•
•
•
True Load Disconnect  
Soft-Start and Input Current Limit  
Over-Voltage (Open LED, Open Circuit), Short Circuit,  
and Over-Temperature Protection  
-40°C to +85°C Temperature Range  
TDFN33-14 Package  
•
•
Applications  
•
•
•
•
•
LED Photo Flash / Torch  
The maximum flash and movie-mode current is set by  
one external resistor where the ratio of flash to movie-  
mode current is set at approximately 7.3:1. The AAT1274  
can drive one high current LED.  
Camera Enabled Mobile Devices  
Cellphones/Smartphones  
Digital Still Cameras (DSCs)  
Multimedia Mobile Phones  
The AAT1274 contains a thermal management system to  
protect the device in the event of an output short-circuit  
condition. Built-in circuitry prevents excessive inrush  
current during start-up. The shutdown feature reduces  
quiescent current to less than 1.0μA.  
The AAT1274 is available in a Pb-free, thermally-enhanced  
TDFN33-14 package and operates over the -40°C to 85°C  
temperature range.  
Typical Application  
L1 1μH  
SW  
VBAT = 2.7V to 5.5V  
Enable/Set Input  
IN  
OUT  
COUT  
CIN  
2.2μF  
2.2μF  
Flash LED  
AAT1274  
EN/SET  
FL  
Flash Enable  
Flash Inhibit  
FLEN  
RSET  
RSET  
FLINH  
PGND AGND FLGND  
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com  
1
201981A  
• Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • May 21, 2012  
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