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AAT1231

AAT
Part Number AAT1231
Manufacturer AAT
Description Step-Up DC/DC Converter
Published Apr 30, 2007
Detailed Description Step-Up DC/DC Converters for White LED Backlight Applications General Description The AAT1231/1231-1 are high frequency,...
Datasheet PDF File AAT1231 PDF File

AAT1231
AAT1231

Overview
Step-Up DC/DC Converters for White LED Backlight Applications General Description The AAT1231/1231-1 are high frequency, high efficiency constant current boost converters capable of 24V maximum output voltage.
Both devices are ideal power solutions for backlight applications with up to six white LEDs in series or up to twelve white LEDs in a parallel/series configuration.
The input voltage is 2.
7V to 5.
5V for single-cell lithiumion/polymer (Li-ion) based portable devices.
The LED current is digitally controlled across a 6x operating range using AnalogicTech’s Simple Serial Control™ (S2Cwire™) interface.
Programmability across 26 discrete current steps provides high resolution, low noise, flicker-free, constant LED outputs.
In programming AAT1231 operation, LED brightness increases based on the data received at the EN/SET pin.
In programming AAT1231-1 operation, LED brightness decreases based on the data received at the EN/SET pin.
The SEL logic pin changes the feedback voltage between two programmable ranges.
AAT1231/1231-1 SwitchReg™ Features • • • • • • • • • • The AAT1231 and the AAT1231-1 feature high current limit and fast, stable transitions for stepped or pulsed www.
DataSheet4U.
com • current applications.
The high switching frequency (up • to 2MHz) provides fast response and allows the use • of ultra-small external components, including chip inductors and capacitors.
Fully integrated control circuitry simplifies design and reduces total solution size.
The AAT1231 and the AAT1231-1 offer a true load Applications disconnect feature which isolates the load from the power source while in the OFF or disabled state.
This • Digital Still Cameras (DSCs) eliminates leakage current, making the devices ideal• Mobile Handsets ly suited for battery-powered applications.
• MP3 Players • PDAs and Notebook PCs The AAT1231 and the AAT1231-1 are available in Pb• White LED Drivers free, thermally-enhanced 12-pin TSOPJW packages.
Input Voltage Range: 2.
7V to 5.
5V Maximum C...


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