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Photo Flash and LED Backlight Driver ICs Optimize Power Efficiency in Feature Phone Designs from AnalogicTech

Advanced Analogic Technologies Inc. (AnalogicTech) announced a new set of flash and backlight White LED (WLED) drivers for the feature phone market. The AAT3176 flash driver and the AAT3351 white LED driver are designed to extend battery life and reduce product footprint.

Reduced PCB requirements

Operating from a 2.7V to 5.5V input voltage, the AAT3176 flash driver IC supplies up to 500 mA output current. The dual mode charge pump maximizes power efficiency by supporting both 1X and 2X operation and can be programmed across 16 distinct steps via AnalogicTech's patented S2Cwire (Simple Serial Control) interface. Coming in a package 20% smaller than comparable devices, the AAT3176 allows designers to build compact camera lighting solutions.

The AAT3176 uses separate external resistors to set maximum flash and movie-mode current. The driver features a thermal management system that includes open- and short-circuit protection and automatic soft-start circuitry. A load disconnect feature extends battery life by disconnecting the load during shutdown and reducing quiescent current to less than 1.0 A.

High Efficiency LED Driver

The AAT3351 is a charge pump capable of driving up to 4 White LEDs at up to 30 mA each. The dual-mode fractional charge pump automatically switches between 1X and 1.5X modes based on input voltage, LED forward voltage and load current to maximize efficiency. A 1 MHz switching frequency helps minimize external component size.

The device uses AnalogicTech's S2Cwire serial digital interface to enable, disable and set current to any of 32 levels. LED current output accuracy is +/-10% and LED current matching is 3%. The AAT3351 also adds automatic soft-start circuitry and built-in short-circuit protection.

Price and Availability

Both ICs are qualified across the -40 C to +85 C temperature range. The AAT3176 is available in a compact 2.2 x 2.2-mm, 10-pin TDFN package and sells for $0.66. The AAT3351 comes in either a 14-pin TSOPJW or 12-pin TDFN33 package and sells for $0.48 in 1K quantities.

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