AAT1235 High Efficiency White LED Drivers for Backlight and Keypad

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 single-cell 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. Skyworks’ 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 two-wire interface; please see the AAT1236 datasheet. The AAT1235 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 temperature range.

技术特性

2.7V to 5.5V Input Voltage Range
Compatible with Common Anode RGB LEDs
Four S2Cwire Controlled Lighting Moods
0~60mA Programmable Current Source
Low Noise Constant Frequency Operation
No Inductors
Small Application Circuit
Regulated Output Current
ntegrated LED Control Switches
Automatic Soft-Start
Less than 1μA Shutdown Current

订购信息 Ordering Information

AAT1235

应用领域 APPLICATION

Digital Still Cameras (DSCs)
Keypad Backlight
Large Panel Displays
Mobile Handsets
Personal Media Players
PDAs and Notebook PCs
White LED Backlight

AAT1235 典型应用

应用技术支持与电子电路设计开发资源下载	版本信息	大小
AAT1235 数据资料DataSheet下载:pdf	Rev.V2	2 页