Full-Bridge Motor Driver features integrated Hall element.
Press Release Summary:
Designed to drive single-phase, low-voltage bipolar brushless dc motors, Model A1441 uses single Hall element to detect position of alternating pole ring magnet. On-chip charge pump circuit allows use of MOS full-bridge output. Switchpoints of device are chopper-stabilized for precision over operating temperature and voltage. Active braking function and sleep mode can be enabled by external signal. Driver comes in 2 x 2 x 0.5 mm MLP package with 100% tin plating.
Original Press Release:
Allegro Microsystems, Inc. Introduces Full-Bridge Motor Driver, Providing Integration of Hall Element and Motor Control Circuitry
Worcester, MA, Oct. 11, 2005 - Allegro MicroSystems, Inc. announces the; release of the A1441, a full-bridge motor driver designed to drive single-phase, low-voltage bipolar brushless DC motors. Commutation of the motor is achieved by the use of a single Hall element to detect the position of an alternating pole ring magnet. Allegro's advanced IC semiconductor process allows for the integration of the Hall element on the same IC as the motor control circuitry, providing a single-chip solution for high reliability.
An on-chip charge pump circuit allows for the use of a MOS full-bridge output complete with body diodes, eliminating the need for flyback diodes or capacitors. In fact, all necessary circuitry is integrated and no external devices are required. A bypass capacitor is recommended to lower switching transients and therefore reduced radiated emissions. The switchpoints of the device are chopper-stabilized for precision over operating temperature and voltage.
An active braking function and sleep mode can be enabled by an external signal. The active braking function allows for a quick stop in order to improve stop/start cycles in gaming applications. The micropower sleep mode reduces current consumption to near zero current for battery management in portable applications.
The device is available in a low-profile 2 x 2 x 0.5 mm MLP package with 100 percent tin plating (EL package). Targeted at the consumer market, the A1441 will have a 12-week lead-time ARO, and is priced at $0.63 for quantities of 10,000.
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. It 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.
