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November 17, 2015
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.
Allegro MicroSystems is redefining the future of power and sensing technologies. From green energy to advanced mobility and motion control systems, our team is passionate about developing intelligent solutions that move the world forward and give our customers a competitive edge. With global engineering, manufacturing and support, Allegro is a trusted partner to both large enterprises and regional market leaders worldwide. Visit www.allegromicro.com.