Allegro MicroSystems ARG81402 Multi-Output Regulator

Allegro MicroSystems ARG81402 Multi-Output Regulator permits power to loads such as microprocessors, sensors, and communication transceivers and is ideal for both automotive and industrial applications. The ARG81402 is highly integrated with a synchronous buck 5.35V pre-regulator, five LDO outputs, a configurable watchdog, and dedicated pins for a power-on reset output (NPOR). Furthermore, the device provides a self-generated Safe State output and a fault flag output to alert the microprocessor that a fault has occurred.

The Allegro MicroSystems ARG81402 Multi-Output Regulator is housed in a low-profile 32-lead, 5mm × 5mm, 0.5mm pitch QFN package (suffix “ET”) with an exposed thermal pad and wettable flank to allow solder joint inspection.

Features

Control and diagnostic reporting through a serial peripheral interface (SPI)
Wide input voltage range (6VIN to 36VIN operating range, 40VIN maximum)
2.2MHz Synchronous buck 5.35V pre-regulator (VREG) for integration and efficiency
Five internal linear regulators with foldback short-circuit protection
3.3V and 4 x 5V outputs (one with short- to-battery protection for remote sensors)
OV and UV protection for all output rails provide the ability to monitor the health of outputs
Pin-to-pin and pin-to-ground tolerant at every pin

Three configurable watchdogs with fail-safe features pulse period, window, Q&A watchdog
Power-on reset signal (NPOR) indicating a fault on the 3.3V output, the optional 1.3V input monitor (for self-powered core voltage) and a watchdog failure
Safety signal (POE) can disable a separate function (e.g., Motor Driver) due to a watchdog failure
Pin-to-pin and pin-to-ground tolerant at every pin
5mm × 5mm eQFN wettable flank package for small solution size, good thermals, and guaranteed solder fillet

Applications

Provides system power (for microcontroller/DSP, CAN, sensors, etc.) in:
- Industrial applications
- Electronic power steering (EPS)
- Advanced braking systems (ABS)
- Transmission control units (TCU)
- Emissions control modules
- Other automotive applications

Allegro MicroSystems ARG81402 Multi-Output Regulator

Features

Applications

Simplified Block Diagram

Typical Schematic

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