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 5 V, 300 mAMIN LDO and a 5 V, 200 mAMIN 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 22.5 ms 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.
Allegro's A4409 is a Quality Managed (QM) product that has been developed according to the automotive quality requirements of TS 16949 and contains features targeted for automotive safety applications. This product can be qualified for use in accordance with ISO 26262 in compliant safety systems by ensuring a robust integration of the component into the system design. Safety documentation will be provided to support and guide the integration process.
Provides System Power for (μC/DSP, CAN, sensors, etc.)
in Automototive Control Modules, such as:
|Part Number||Package Type||Temperature||RoHS
|Part Composition /
|APEK4409KLP-01-MH||DEMO BOARD||-20°C to 85°C||No||--||Contact your
local sales rep
|A4409KLPTR-T||20-lead TSSOP||-40°C to 150°C||Yes||View Data||Contact your
local sales rep