The ARG81400 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 five linear regulators— 3.3 V / 90 mA, 5 V / 200 mA, 5 V / 30 mA, 5 V / 55 mA, and 5 V /100 mA (short-battery protected)—and an adjustable output, 600 mA synchronous buck. Designed for high-temperature operation, the ARG81400 is ideal for under-hood applications.
Enable inputs to the ARG81400 include a logic level (ENB) and a high-voltage (ENBAT). The ARG81400 also provides flexibility with disable function of the individual 5 V rails through a serial peripheral interface (SPI).
Diagnostic outputs from the ARG81400 include a power-onreset output (NPOR), an ENBAT status output, and a fault flag output to alert the microprocessor that a fault has occurred. The microprocessor can read fault status through SPI. Dual bandgaps, one for regulation and one for fault checking, improve safety coverage and fault detection of the ARG81400.
The ARG81400 contains a Window Watchdog timer with a programmable detect period of 250, 500, 1000, or 2000 μs. The watchdog timer enters an active state after NPOR transitions high and the processor has exercised the WD Test routine. The watchdog can be put into flash mode or be reset via secure SPI commands.
Protection features include undervoltage and overvoltage on all output rails. In case of a shorted output, all linear regulators feature foldback overcurrent protection. In addition, the V5P output is protected from a short-to-battery event. Both switching regulators include pulse-by-pulse current limit, hiccup mode short-circuit protection, LX short-circuit protection, missing asynchronous diode protection (VREG only) and thermal shutdown.
The ARG81400 is supplied in a low-profile (1.2 mm maximum height) 38-lead eTSSOP package (suffix “LV”) with exposed power pad.
Astrorep Inc. (Allegro and Sanken Semiconductors,
Sanken Power Supplies)
700 Veterans Memorial Hwy
Hauppauge, NY 11788
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|Part Number||Package Type||Temperature||RoHS
|Part Composition /
|APEK81400KLV-01-MH||DEMO BOARD||-40°C to 150°C||No||--||Contact your
local sales rep
|ARG81400KLVATR||38-lead TSSOP||-40°C to 150°C||Yes||View Data||Contact your
local sales rep