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High-Performance Power ICs and Hall-Effect Sensors
Allegro Announces New High Efficiency Charge Pump
White LED Driver
Achieve Excellent Accuracy and Matching, Flexibility in Dimming
and Control in a Small 3x3 Package 
Worcester, MA, March 2, 2006 — Allegro MicroSystems, Inc. has released a new high efficiency charge pump white LED driver to market. Allegro's A8435 offers a simple, low-cost white LED driver solution for portable electronics display applications. Using a proprietary control scheme (1x, 1.5x), this new LED driver can output well-matched LED currents for up to four channels, while maintaining the highest efficiency over most of the Li-Ion battery lifetime.
Allegro's A8435 accepts an input range of 2.7 V to 5.5 V and delivers up to 30 mA for each of the four regulated current sources. The A8435 can deliver a total output current of 120 mA, meeting the requirements of most Li-ion battery-powered white LED backlight applications. Outputs can also be combined for WLED flash/torch applications.
The A8435 offers flexible options for LED current driving. The LED current can be set by any of the following methods: (a) choosing an appropriate value for RSET, (b) two-bit parallel control with three levels, (c) PWM control, or (d) one-wire serial pulse input to enable the part and set up to eleven dimming levels from 100% down to 5%.
The A8435 is available in a very thin profile (0.75 mm) 3x3 mm MLP-16 package (A8435EES), meeting the needs of space-conscious applications. For more information on this part, please access Allegro's A8435 datasheet at ../../Products/Part_Numbers/8435.
About Allegro
Allegro MicroSystems, Inc. is a supplier of advanced mixed-signal power semiconductors and Hall-effect sensors targeted toward the automotive, communications, computer/office automation, consumer and industrial markets. Allegro maintains a leadership position in the integrated magnetic sensor and integrated motor driver product segments. With more than 2,000 employees, Allegro is headquartered in Worcester, MA. Further information about Allegro, including free samples of our products, can be found at www.allegromicro.com.
Editorial Contact:
Stephanie Fennelly
Director – Marketing Communications
Tel: (508) 854-5363
sfennelly@allegromicro.com