ARG81400: Buck or Buck/Boost Pre-Regulator with a Synchronous Buck, 5 Internal Linear Regulators, Pulse-Width Watchdog Timer, and SPI

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.

A2-SIL™ pending—device features for safety critical systems


  • Electronic Power Steering (EPS)
  • Transmission Control Units (TCU)
  • Advanced Braking Systems (ABS)
  • Emissions Control Modules
  • Other automotive applications

Astrorep Inc. (Allegro and Sanken Semiconductors, Sanken Power Supplies)
700 Veterans Memorial Hwy
Suite 310
Hauppauge, NY 11788
Phone: (631)422-2500
Fax: (631)422-2504

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  • A2-SIL™ compliant—device features for safety critical systems
  • Automotive AEC-Q100 qualified
  • Wide input voltage range, 3.8 to 40 VIN operating range, 50 VIN maximum
  • Buck or buck/boost pre-regulator (VREG)
  • Adjustable 1.25 to 3.3 V synchronous buck
  • Four internal linear regulators with foldback short-circuit protection, 3.3 V (3V3) and three 5 V (V5CAN, V5A, and V5B)
  • One internal 5 V linear regulator (V5P) with foldback short-circuit and short-to-battery protection
  • Power-on reset signal indicating a fault on the synchronous buck, 3V3 or V5A regulator outputs (NPOR)
  • Window watchdog timer with fail-safe features
  • Dual bandgaps for increased safety coverage and fault detection, BGVREF, BGFAULT
  • Control and diagnostic reporting through a serial peripheral interface (SPI)
  • Logic enable input (ENB) for microprocessor control
  • Ignition enable input (ENBAT) with status indicator output
  • Frequency dithering and controlled slew rate helps reduce EMI/EMC
  • OV and UV protection for all output rails
  • Pin-to-pin and pin-to-ground tolerant at every pin
ARG81400 Packages

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ARG81400 Product Image ARG81400 Block Giagram

Part Number Specifications and Availability

Part Number Package Type Temperature RoHS
Part Composition /
RoHS Data
Comments Samples Check
Distributor Stock
APEK81400KLV-01-MH DEMO BOARD -40°C to 150°C No -- Contact your
local sales rep
Check Stock
ARG81400KLVATR 38-lead TSSOP -40°C to 150°C Yes View Data Contact your
local sales rep
Check Stock

Allegro’s products are not to be used in any devices or systems, including but not limited to life support devices or systems, in which a failure of Allegro’s product can reasonably be expected to cause bodily harm.

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