Single/dual white LED flash driver improves picture quality in mobile phones

Single/dual white LED flash driver improves picture quality in mobile phones

Suitable for mobile phones and digital still cameras, the AS3645 single/dual LED flash driver is claimed to offer 25% higher output current than existing equivalents. The higher flash power enhances picture and video quality especially in a low-light environment at the same system size. Its high-efficiency 2-MHz fixed-frequency dc/dc boost converter with soft start allows small inductors and enables easy integration into noise-sensitive RF systems.

The part auto-detects whether to employ single or dual LED mode, and enables direct one-button flashlight mode. Safety features include programmable current limiting, auto test (LED open/short detection), overvoltage and undervoltage, overtemperature, and automatic flash timeout timer for thermal LED protection during flash.

The inductive driver drives up to 1,000 mA and can be used in single-LED flash or double-LED flash environments. The high-side current source works with up to 2×500 mA with two LEDs in serial configuration, and up to 720 mA with one LED. The AS3645 is available in a WL-CSP package and has an operating temperature range of –30° to 85°C. (Less than $0.90 ea/1,000 — available now.)

austriamicrosystems , Premstaetten , Austria
US Sales Office 408-345-1790

http://www.austriamicrosystems.com