Allegro MicroSystems, Inc. Announces Automotive Multi-Output Regulator Target at Emerging Applications

Worcester, MA, Jan. 20, 2005 — Allegro MicroSystems, Inc. announces the release of a new automotive-grade multi-output regulator IC that features four regulator outputs. Two low-voltage outputs (using external pass transistors) provide DSP or microprocessor core and I/O voltages, while two linear 5 V tracking regulators, which track within 0.5% over temperature, can be used for driving sensor ICs and other 5 V peripherals. Both 5 V outputs feature current foldback circuitry to protect against any short-to-ground events. The A8450 incorporates controlled power-up sequencing and power-on-reset (POR) functionality, as well as extensive fault detection and reporting.

By combining multiple voltage regulators on a single IC, the A8450 saves board space and is more cost competitive when compared to multiple-IC solutions. The 6 V to 45 V input voltage (Vbat) and 150°C (Tj) operation allows the IC to be used in severe under-hood environments in either 14 V or 24 V automotive systems. The A8450 can be rated to these high temperatures and voltages by utilizing an integrated buck switching pre-regulator, which substantially increases the thermal efficiency of the IC over standard linear output regulators.

The A8450 can be enabled/disabled with one of two input pins. A high voltage (ENBAT) input allows enable/disable from a high-voltage ignition signal, or a logic input (ENB) allows enable/disable via a logic signal from the microcontroller or DSP. In the disabled mode, the A8450 draws less than 10 uA of quiescent current. A power-on-reset (POR) block monitors the supply voltages and provides a signal that can be used to reset a DSP or microcontroller.

The A8450 is manufactured using Allegro's ABCD (Allegro Bipolar CMOS DMOS) process and is offered in an industry-standard 24-lead SOIC batwing package (suffix 'LB').

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