DATA SHEET
AAT1274
1.5A Single Flash LED Driver IC
General Description
Features
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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:
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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.
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Flash/Movie Mode Current Ratio
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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
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Applications
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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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