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AAT1236 Datasheet(PDF) 1 Page - Advanced Analog Technology, Inc. |
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AAT1236 Datasheet(HTML) 1 Page - Advanced Analog Technology, Inc. |
1 / 24 page AAT1236 High Efficiency White LED Drivers for Backlight and Keypad 1236.2007.02.1.1 1 SwitchReg™ General Description The AAT1236 is a highly integrated, high efficiency power solution for white LED and keypad backlights in mobile/portable devices. It is based on a switching boost converter which steps up the single cell lithi- um-ion/polymer battery voltage to drive 5 strings of series-connected white LEDs with precision current regulation. The AAT1236 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 tran- sients and allows the use of small external compo- nents. A fully integrated control circuit simplifies the design and reduces total solution size. A two-wire I2C serial digital interface is used to indi- vidually turn each output sink on/off and adjust the LED current by group. Unlike conventional pulse width modulation (PWM) control of LED brightness, the AAT1236 drives the LEDs with constant, non- pulsating current. The interface is fully compliant to the Fast/Standard mode I2C specification, allowing a transfer rate of up to 400kHz. A similar device is also available with a proprietary Advanced Simple Serial Control™ (AS2Cwire™) sin- gle wire interface; please see the AAT1235 datasheet. The AAT1236 is available in a Pb-free, thermally- enhanced 16-pin 3x4mm TDFN package and is specified for operation over the -40°C to +85°C tem- perature range. Features • 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 • Two-Wire, I2C Compliant Serial Interface — Two 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, 400kHz Serial Transfer Rate • Non-Pulsating, High-Performance LED Current Drive for Uniform Illumination — 10% Absolute Accuracy — 2% Channel-to-Channel Matching • Over-Voltage and Over-Temperature Protection • Automatic Soft-Start Minimizes Large Inrush Current at Startup • Available in 3x4mm TDFN34-16 Package Applications • Digital Still Cameras (DSCs) • Keypad Backlight • Large Panel Displays • Mobile Handsets • PDAs and Notebook PCs • Personal Media Players • White LED Backlight Typical Application EN AGND VIN L=2.2µH D1 C 2.2µF IN C R2 187k Ω R3 12.1k Ω R1 22.6k Ω OUT 2.2µF Input : 2.7V~5.5V AAT1236 SW B1 Up to 24V max GND RSET B2 A1 A2 A3 Enable OV Backlight LEDs Keypad or RGB LEDs LIN IN SDA SCL SDA SCL I2C Interface |
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