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A4409

Part Number	A4409
Manufacturer	Allegro Micro Systems
Description	Adjustable Frequency Buck or Buck-Boost Pre-Regulator
Published	Aug 26, 2017
Detailed Description	A4409 Adjustable Frequency Buck or Buck-Boost Pre-Regulator with 2 LDOs, Window Watchdog Timer, and NPOR FEATURES AND ...
Datasheet	A4409 PDF File

Overview

A4409 Adjustable Frequency Buck or Buck-Boost Pre-Regulator with 2 LDOs, Window Watchdog Timer, and NPOR FEATURES AND BENEFITS • Automotive AEC-Q100 qualified • VIN operating range from 3 to 36 V, with 40 V maximum • Buck or buck-boost pre-regulator (VREG) • Adjustable PWM switching frequency: 250 kHz to 2.
4 MHz • PWM frequency can be synchronized to external clock • Two 5 V internal LDO regulators with foldback short- circuit protection • Power-on reset (NPOR) with fixed delay of 22.
5 ms • Programmable window watchdog timer with a fixed activation delay of 30 ms • Active low, watchdog timer enable/disable pin (WDENn) • Dual bandgaps for increased reliability: □□BG1 for VREG, 5V0...

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