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A4408

Allegro Micro Systems
Part Number A4408
Manufacturer Allegro Micro Systems
Description Adjustable Frequency Buck or Buck-Boost Pre-Regulator
Published Aug 26, 2017
Detailed Description A4408 Adjustable Frequency Buck or Buck-Boost Pre-Regulator with a Synchronous Buck, 3 Internal LDOs, Watchdog Timer, NP...
Datasheet PDF File A4408 PDF File

A4408
A4408

Overview
A4408 Adjustable Frequency Buck or Buck-Boost Pre-Regulator with a Synchronous Buck, 3 Internal LDOs, Watchdog Timer, NPOR, and FF0/FF1 FEATURES AND BENEFITS • Automotive AEC-Q100 qualified • 2.
8 to 36 VIN operating range, 40 VIN 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 • Adjustable synchronous buck regulator (1.
25 VNOM) • 3.
3V (3V3) and 5V (V5) internal LDO regulators with foldback short-circuit protections • 5V (V5P) internal tracking LDO regulator with foldback short-circuit and short-to-battery protections • TRACK sets either 3V3 or V5 as the reference for V5P • Power-on reset (NPOR) with fixed delay of 15 ms • Programmable watchdog timer with activation delay • Active-low watchdog timer enable pin (WDENn) • Dual bandgaps for increased reliability: BGVREF, BGFAULT • MODE pin sets the NPOR undervoltage threshold for V5 and V5P • Fixed POK5V undervoltage threshold for V5 and V5P • Logic enable input (ENB) for microprocessor control • Two ignition enable inputs (ENBAT1 and ENBAT2) Continued on next page.
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APPLICATIONS □□Electronic Power Steering (EPS) □□Transmission Control Units (TCU) □□Advanced Braking Systems (ABS) □□Emissions Control Modules □□Other automotive applications PACKAGE: 38-Pin eTSSOP (suffix LV) Not to scale DESCRIPTION The A4408 is 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 output of the pre-regulator supplies a 5 V / 115 mAMAX tracking/protected LDO, a 3.
3 V / 165 mAMAX LDO, a 5 V / 325 mAMAX LDO, and an adjustable output synchronous buck regulator (1.
25 VTYP / 700  mADC).
Designed to supply CAN or microprocessor power supplies in high-temperature environments, the A4408 is ideal for underhood applications.
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