Highly Integrated IC Drives Vibration Motors

Aug. 29, 2007
Designed for small, portable applications, the Allegro MicroSystems A1442 incorporates a Hall sensor to detect rotational position and includes motor-control circuitry and a full output bridge.

The A1442 full-bridge motor driver from Allegro MicroSystems Inc. targets low-voltage, bipolar, brushless dc motor applications. Commutation is achieved by a single Hall sensor that detects the rotational position of an alternating-pole ring magnet. A high-density CMOS process allows the integration of all the necessary electronics, including the Hall element, the motor-control circuitry, and the full output bridge. The chip includes reverse-battery protection and output short-circuit protection, eliminating the need for any external support components. Also, low-voltage design techniques allow the IC to function down to 1.8 V DD.

The driver is optimized for vibration-motor applications, such as cell phones, pagers, electronic toothbrushes, handheld games, and low-power fans. A soft-switching algorithm reduces audible switching noise and electromagnetic interference. For battery management in portable systems, users can activate a micropower sleep mode that reduces current consumption and eliminates the need for a FET to switch the device on and off. In addition, the driver’s active motor-braking function can be used to improve start/stop cycles for caller ID features in vibration mode. The A1442 is available in a lead-free, six-pin micro-leadframe package (MLP) for surface mounting, with an exposed pad for enhanced heat dissipation.

PRICING AND AVAILABILITY
The A1442 costs $0.39 each in quantities of 1000. Typical lead times are six to eight weeks. FOR MORE INFORMATION
Visit www.allegromicro.com.

Sponsored Recommendations

Highly Integrated 20A Digital Power Module for High Current Applications

March 20, 2024
Renesas latest power module delivers the highest efficiency (up to 94% peak) and fast time-to-market solution in an extremely small footprint. The RRM12120 is ideal for space...

Empowering Innovation: Your Power Partner for Tomorrow's Challenges

March 20, 2024
Discover how innovation, quality, and reliability are embedded into every aspect of Renesas' power products.

Article: Meeting the challenges of power conversion in e-bikes

March 18, 2024
Managing electrical noise in a compact and lightweight vehicle is a perpetual obstacle

Power modules provide high-efficiency conversion between 400V and 800V systems for electric vehicles

March 18, 2024
Porsche, Hyundai and GMC all are converting 400 – 800V today in very different ways. Learn more about how power modules stack up to these discrete designs.

Comments

To join the conversation, and become an exclusive member of Electronic Design, create an account today!