Austriamicrosystems - New single/dual white LED flash driver improves picture quality

A new LED flash driver, the AS3645 has been introduced by Austriamicrosystems. The inductive, ultra-small high-EFFICIENCY single/dual LED flash driver offers 25 per cent higher output current than existing equivalents. The higher flash power enhances picture and video quality especially in low-light environments at the same system size, says the company.   The AS3645 inductive flash driver drives up to 1000mA and can be used in single LED flash or double LED flash environments.  The high-side current source works with up to 2x500mA with two LEDs in serial configuration and up to 720mA with one LED. When driving two LEDs in series, LEDs draw identical currents and provide output light matching and thermal dissipation. The AS3645 auto detects whether to employ single or dual LED mode and enables direct one-button flashlight mode. A number of safety features protect against circuit damage and improve test time, including programmable current limiting, auto test (LED open/short detection), overvoltage and under-voltage, over-temperature and automatic flash timeout timer for thermal LED protection during flash.   These features suit the needs of a camera phone flash, especially in smart phones and feature-phones. For other devices with cameras, including digital still cameras, camcorders and PDAs, the AS3645 flashlight driver is a perfect solution. Its high efficiency 2MHz fixed-frequency DC-DC boost CONVERTER with soft start allows small inductors and enables easy integration into noise sensitive RF systems. The high power LED flash current source can operate in flash, torch and assist (video) light mode. An additional current source drives an optional indicator LED. Control can be implemented through either the parallel interface mode to allow simple integration, or the I2C interface to allow more sophisticated control of all settings like currents and timings. The interface is selected by a dedicated pin (I2C/EN).   The AS3645 is available in a tiny WL-CSP package (3x4 balls 0.5 mm pitch, 2x1.6 mm) and has an operating temperature range of -30C to +85C (ambient).

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