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AAT1235

Advanced Analogic Technologies
Part Number AAT1235
Manufacturer Advanced Analogic Technologies
Description High Efficiency White LED Drivers
Published Aug 28, 2008
Detailed Description High Efficiency White LED Drivers for Backlight and Keypad General Description The AAT1235 is a highly integrated, high ...
Datasheet PDF File AAT1235 PDF File

AAT1235
AAT1235


Overview
High Efficiency White LED Drivers for Backlight and Keypad General Description The AAT1235 is a highly integrated, high efficiency power solution for white LED backlight and keypad backlights in mobile/portable devices.
It is based on a switching boost converter which steps up the singlecell lithium-ion/polymer battery voltage to drive 5 strings of series-connected white LEDs with precision current regulation.
The AAT1235 is capable of driving a total of four LEDs per channel.
The boost converter can produce an output drive of up to 24V at 100mA.
The high switching frequency (up to 2MHz) provides fast response to load transients and allows the use of small external components.
A fully integrated control circuit simplifies the design and reduces total solution size.
AnalogicTech's Advanced Simple Serial Control™ (AS2Cwire™) serial digital input is used to individually turn each output sink on/off and adjust the LED current by group.
Unlike conventional pulse width modulation (PWM) control of LED brightness, the AAT1235 drives the LEDs with constant, non-pulsating current.
A similar device is also available with an I2C twowire interface; please see the AAT1236 datasheet.
The AAT1235 is available in a Pb-free, thermallyenhanced 16-pin 3x4mm TDFN package and is specified for operation over the -40°C to +85°C temperature range.
AAT1235 Features • • • • • • SwitchReg™ www.
DataSheet4U.
com • • • • Input Supply Voltage Range: 2.
7V to 5.
5V Maximum Boost Output Drive: Up to 24V at 100mA Up to 85% Efficient Operation Up to 2MHz Switching Frequency with Small Inductor User-Programmable Full-Scale LED Current, Up to 30mA Single-Wire AS2Cwire Serial Interface — Five Addressable Registers • Independent LED Current Control by Group — Backlight Group B1-B2, 16 Settings — Auxiliary Group A1-A3, 16 Settings • Independent LED ON/OFF Control — Fast, 1MHz Serial Interface Non-Pulsating, High-Performance LED Current Drive for Uniform Illumination — 10% Absolute Accuracy — 2% Channel...


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