Allegro MicroSystems, LLC Announces New Automotive Multi-Output PMIC With Buck Or Buck/Boost Pre-Regulator

Adjustable Frequency with a Synchronous Buck, 5 V Protected LDO, Pulse-Width Window Watchdog & NPOR

September 20, 2016

A4413 Product image

Allegro MicroSystems, LLC announces a new power management IC that can be configured as 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 output of Allegro’s A4413 supplies both a 5 V, 75 mAMAX high-voltage protected LDO for remote sensors (V5P), and a 0.8 to 3.3 V, 800 mAMAX adjustable synchronous buck regulator (ADJ). Designed to supply microprocessor power supplies in high-temperature environments, the A4413 is ideal for under hood and other automotive applications.

The A4413 can be enabled by its logic-level (ENB) or high-voltage (ENBAT) input. Diagnostic outputs from the A4413 include a power-on-reset output (NPOR) with a 2 ms rising delay to monitor the synchronous buck, a PowerOK output to monitor the 5 V LDO (POK5V), and an ENBAT status output (ENBATS). Dual bandgaps—one for regulation and one for fault detection—improve long-term reliability of the A4413.

The A4413 contains a pulse-width window watchdog (PWWD) timer that can be programmed to detect pulse widths from 1 to 2 ms (WDADJ). The watchdog timer has an activation delay that scales with the pulse-width setting to accommodate processor startup. The tolerance of the watchdog’s window can be set to ±8%, ±13%, or ±18% using the WDTOL pin. The watchdog timer has an active-low enable pin (WDENn) to facilitate initial factory programming or field reflash programming.

Protection features include under- and overvoltage lockout on both output supply rails. In case of a shorted output, the LDO regulator features foldback overcurrent protection. In addition, the 5 V output is protected from a short-to-battery event. Both switching regulators include pulse-by-pulse current limit, hiccup mode short-circuit protection, LX (regulator output switching node) short-circuit protection to provide protection to the IC from damage in the case of accidental short-circuit from LX pins, missing asynchronous diode protection (VREG only), and thermal shutdown (TSD).

The A4413 is supplied in a low-profile 32-lead, 5 mm × 5 mm, 0.5 mm pitch QFN package (suffix “ET”) 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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