Allegro MicroSystems, Inc. Introduces New Automotive 2.2 MHz Multiple Output Regulator Family

Full Automotive Qualification with High-Frequency Switching (> AM Band)

October 16, 2012

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Worcester, MA – Allegro MicroSystems, Inc. introduces three new automotive power management ICs that use an internal 2.2 MHz constant on-time buck pre-regulator to supply regulated outputs commonly used in automotive CAN and microprocessor controlled applications. These new devices are targeted at the automotive market for bias supplies within control units for functions such as electronic power steering, transmission control, antilock braking and emissions control.

Allegro’s A4407 supports four regulated outputs - a 5 V linear regulator, a 5 V tracking/protected linear regulator, a 3.3 V linear FET controller/driver and an adjustable linear regulated output. Allegro’s A4405 supports three regulated outputs - a 5 V linear regulator, a 5 V tracking/protected linear regulator, and a 3.3 V linear FET controller/driver. Allegro’s A4406 is a scaled down version of the A4405 and can supply a 5 V tracking/protected linear regulator, and a 3.3 V linear FET controller/driver.

The 5VP output of the A4405 and A4406 tracks the 3.3V output, while the A4407 provides a pin to set the master reference for the 5 VP tracking regulator to either the 3.3 V or the second 5 V output. The on-time of the buck pre-regulator is internally adjusted as a function of VIN to maintain the 2.2 MHz switching frequency. Efficient operation is achieved by using the buck pre-regulator to drop the input voltage before supplying the linear regulators.

The buck switching pre-regulator is designed to operate at a nominal switching frequency of 2.2 MHz. The high switching frequency enables the customer to select low value inductors and ceramic capacitors while avoiding EMI in the AM frequency band.

Protection features include under voltage lockout, pulse-by-pulse current limit, LX short circuit protection, and thermal shutdown. In case of a shorted load all linear regulators feature fold back over current protection and the V5P output is protected from a short-to-battery event.

All three devices feature both a logic level and a high-voltage (current and voltage limited) enable input. They also integrate a power-on-reset (NPOR) output with adjustable delay for microprocessor control.

The A4405 and A4406 devices are offered in a 20-pin TSSOP package and the A4407 is offered in a 24-pin TSSOP package. Both packages have an exposed thermal pad (suffix LP) for enhanced thermal dissipation.



Sobre Allegro

Allegro Microsystems, LLC es una empresa líder en el desarrollo, fabricación y comercialización de semiconductores de alto rendimiento. Las soluciones innovadoras de Allegro son útiles para aplicaciones de alto crecimiento dentro del mercado de la automoción, con enfoque adicional en la automatización de oficinas, industrial y soluciones de comunicaciones/consumo. Allegro tiene su sede en Worcester, Massachusetts (EE.UU.) con centros de diseño, aplicaciones y de soporte de ventas ubicados en todo el mundo. Más información sobre Allegro se puede encontrar en www.allegromicro.com

Allegro Microsystems Europa, con sede en Chertsey, Reino Unido, es la oficina operativa de ventas y comercialización europea, y opera una red de representantes y distribuidores en toda Europa. Allegro cuenta con centros técnicos y de marketing en Heidelberg y Hinterzarten en Alemania. Allegro también dispone de un centro de ingeniería de diseño en el centro de Edimburgo, en Escocia y un centro técnico y de marketing en Annecy en Francia.


Contactos de marketing:

Allegro MicroSystems Europe Ltd.
Tel: +33 (0) 4 50512359
Fax: +33 (0) 4 505 12083 

Email: allegroeurope@allegromicro.com
www.allegromicro.com

 

 

 

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