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The A4409 is a 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 5V, 300mAMIN LDO and a 5V, 200mAMIN LDO. Designed to supply CAN or microprocessor power supplies in high-temperature environments, the A4409 is ideal for underhood applications.
Enable-input to the A4409 is compatible to a high-voltage battery level (ENBAT).
Diagnostic outputs from the A4409 include a power-on-reset output (NPOR) with a fixed 22.5ms typical delay. Dual bandgaps, one for regulation and one for fault checking, improve long-term reliability of a system designed around the A4409.
The A4409 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. The watchdog timer has an enable/disable pin (active low, WDENn) to facilitate initial factory programming or field reflash programming.
Protection features include dual control loop for pre-regulator rail. In case of a shorted output, all linear regulators feature foldback overcurrent protection. The switching regulator includes pulse-by-pulse current limit, hiccup mode short-circuit protection, LX short-circuit protection, missing asynchronous diode protection, and 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.
Provides System Power for (μC/DSP, CAN, sensors, etc.)
in Automototive Control Modules, such as: