Allegro MicroSystems, LLC Announces New Automotive Multiple Output Regulator with Buck-Boost Capability

AEC-Q100 Qualified with 2 LDOs, Window Watchdog Timer and NPOR

November 17, 2015

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Worcester, MA – Allegro MicroSystems, LLC announces a new power management IC that uses a buck or buck-boost pre-regulator to efficiently convert automotive battery voltages into a tightly regulated intermediate voltage, complete with control, diagnostics, and protections. The unique buck-boost design of Allegro’s A4409, allows sub 5 V input voltage operation to accommodate the latest automotive idle-stop requirements. The output of the main switching regulator supplies two 5 V LDOs, one at 300 mA and the other at 200 mA. Designed to supply power to microprocessor/DSP plus sensors, transceivers, and other loads, the A4409 is ideal for Automotive Control Units.

The Enable Input to the A4409 is compatible to a high-voltage battery level (ENBAT). Diagnostic outputs from the device include a power-on-reset output (NPOR). Long-term system reliability is increased by the use of dual internal bandgap voltage references, one for regulation and one for fault-checking.

The A4409 also contains a window watchdog timer that can be programmed to accept a wide range of clock frequencies (WDADJ). The watchdog timer has a fixed 30 ms activation delay to accommodate processor startup, and has an enable/disable pin (active low, WDENn) to facilitate initial factory programming or field re-flash programming.

Additional protection features include foldback overcurrent protection for the LDO outputs. Also the main he switching regulator includes pulse-by-pulse current limit, hiccup mode short-circuit protection, LX short-circuit protection, and missing asynchronous diode protection, and the IC has an overtemperature thermal shutdown.

The A4409 is supplied in a low profile (1.2 mm maximum height), 20-lead eTSSOP package (suffix “LP”) with exposed thermal pad.



A propos d'Allegro

Allegro MicroSystems, LLC est leader dans le développement, la fabrication et le marketing de circuits intégrés de puissance ainsi que de capteurs magnétiques à effet Hall. Les solutions innovantes d'Allegro sont utilisées dans des applications à forte croissance dans les secteurs tels que l'automobile, la communication, l'ordinateur et la bureautique, les produits grand publique ainsi que dans l'industrie. Le siège social d'Allegro est à Worcester dans le Massachusetts (USA) avec des centres de design et d'application situés en Amérique du Nord et du Sud, en Asie et en Europe. De plus amples informations concernant Allegro peuvent être trouvées sur le site Allegro www.allegromicro.com.

Le siège européen d’Allegro MicroSystems Europe en charge des ventes et du marketing se situe à Chertsey en Grande Bretagne. Ce centre coordonne un réseau de représentants et de distributeurs à travers l’Europe. Allegro possède aussi des centres d’applications et marketing à Annecy en France ainsi qu’à Edimbourg en Ecosse.


Contacts Marketing:

Mary Regan
Allegro MicroSystems Europe Ltd.
Tel: 04 50 51 23 59
Email: allegroeurope@allegromicro.com
www.allegromicro.com

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