Multi-output automotive PMIC with buck-boost pre-regulator
These comprise a 5V / 115 mA tracking/protected LDO, a 3.3V / 165 mA LDO, a 5 V / 325 mA LDO, and an adjustable output synchronous buck regulator (1.25 V / 700 mA). Intended for under-hood applications, key automotive applications include: Electronic Power Steering (EPS), Transmission Control Units (TCU), Advanced Braking Systems (ABS), Advanced Driver Assistance Systems (ADAS), and Emissions Control Modules.
The A4408 contains a watchdog timer that can be programmed to accept a wide range of clock frequencies (WDADJ). The watchdog timer has a fixed activation delay to accommodate processor startup. The watchdog timer as an enable/disable pin (active low, WDENn) to facilitate initial factory programming or field reflash programming. Diagnostic outputs from the A4408 include a power-on-reset output (NPOR), status indicators and fault flag. Protection features include under- and overvoltage lockout on all four CPU supply rails. All linear regulators feature foldback overcurrent protection.
The A4408 is supplied in a low profile (1.2 mm maximum height) 38-lead eTSSOP package (suffix “LV”) with exposed thermal pad.
Allegro MicroSystems; www.allegromicro.com
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