Site
Map • Contact
Us 中文 • English
Allegro MicroSystems, Inc. Announces New Low Voltage
Voice Coil Motor Driver with I2C Interface
High Accuracy Digital Motor Current Control in an Extremely Small
Package 
Worcester, MA, October 4, 2007 — Allegro® announces the first device in a series of voice coil motor drivers with I2C serial interface designed for camera auto focus and zoom applications. The operating voltage range is 2.4 V to 5.5 V and the maximum output current is 127 mA. Allegro’s A3904 internal protection features include thermal shutdown and under voltage lockout. Logic input levels are independent of the supply voltage and the operating temperature range is –40°C to +85°C.
Output current is programmed via the I2C interface in 500 µA increments with clock rates up to 400 kHz. I2C inputs set the internal DAC output voltage used as a reference for linear current control using a MOSFET output sink transistor. A logic low input on the SLEEPZ input will put the A3904 into sleep mode and reduce the supply current to <0.5 µA.
The A3904 is supplied at three levels of packaging: 6-contact DFN package (suffix EW) with thin profile (0.38 mm nominal overall height) and exposed tab for enhanced thermal dissipation, bare die form on wafer (suffix CW), and 6-ball wafer level chip scale (WLCSP) bumped package (suffix CG). All package options are Pb (lead) free. The EW and CW packages are available now. Samples of the CG are currently available and production shipments are expected to begin in December 2007.
About Allegro
Allegro MicroSystems, Inc. is a leader in developing, manufacturing and marketing high-performance power and Hall-effect sensor integrated circuits. Allegro's innovative solutions serve high-growth applications within the automotive, communications, computer/office automation, consumer and industrial markets. Allegro is headquartered in Worcester, Massachusetts (USA) with design and applications centers located in North and South America, Asia, and Europe. Further information about Allegro can be found at www.allegromicro.com.
Editorial Contact:
Stephanie Fennelly
Director - Marketing Communications
Tel: (508) 854-5363
sfennelly@allegromicro.com