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A high-frequency, high-efficiency constant-current boost converter, the AAT1239-1, has been unveiled by AnalogicTech. The device is capable of driving up to ten white LEDs (WLEDs) connected in series.
Designed for backlight applications such as PNDs, e-dictionaries, electronic photo frames and cellular handsets, the new driver IC uses proprietary Simple Serial Control (S2CWire?) single-wire interface to dramatic reduce the display flicker that occurs with commonly-used low frequency PWM control schemes.
As portable systems designers continually extend the feature set in their products, they need to use increasingly sophisticated lighting functions to support those new capabilities. By driving up to ten WLEDs in a serial string, the AAT1239-1 simplifies the use of larger LCD panels in a wide array of battery-POWERed portable devices, says the company.
Operating from a 2.7V to 5.5V input range, the device delivers a maximum continuous output of 40V at 30mA and delivers a constant LED current for up to ten WLEDs in series. An integrated soft start function eliminates output voltage overshoot across the full input voltage Range.
The single-wire S2CWire interface controls WLEDs across 26 discrete current steps. It requires no additional circuitry. The AAT1239-1 also features a true load disconnect function that isolates the load from the power source while in the OFF or disabled state. Than 1.0 microamps shutdown current, this feature extends battery life by eliminating leakage current in power-limited portable applications.
The new WLED driver IC offers efficiency levels up to 82%. A high 2MHz switching frequency provides very fast response and helps reduce end product footprint by allowing the use of very small external inductors and capacitors. The AAT1239-1 also offers short-circuit, Over-voltage and over-temperature protection. Qualified across the -40C to +85C temperature range, the AAT1239-1 is available in a Pb-free, 12-pin TSOPJW package, says the company. 