A4480: Wide Input 5 V, 50 mA, Automotive Regulator with Output Short-to-Battery Protection and Power OK


The A4480 is a wide input regulator with complete control, diagnostics, and protection features that address many requirements of automotive applications. It includes a boost function to allow operation with input voltages from 3.5 to 28 V, while maintaining a 5 V output voltage. The A4480 is able to supply up to 50 mA of load current.

An enable pin (ENB) allows control of the regulator output. This pin is rated to operate at up to 40 V, so it can be connected directly to a car battery.

Diagnostic output from the A4480 includes an open-drain Power OK (POK) output to alert the microprocessor that a fault has occurred.

Protection features include input undervoltage lockout (UVLO), foldback overcurrent protection, output under/overvoltage protections (UV/OVP), and thermal shutdown (TSD). In addition, the output is protected from a short-to-battery event.

The A4480 device is available in an 8-pin eSOIC package with exposed pad for enhanced thermal dissipation. It is lead (PB) free, with 100% matte tin leadframe plating.


  • Microcontroller power
  • Transceivers (CAN, LIN, etc.) power supplies
  • Sensors

Top Features

  • Automotive AEC-Q100 qualified
  • Wide operating range of 3.5 to 28 V, with 40 V load dump rating
  • Linear regulator output with foldback short-circuit and short-to-battery protection
  • Boost function to maintain output when input is low
  • Power OK (POK) flag
  • High-voltage logic-level enable input (ENB) for microprocessor or ignition control
  • Pin-to-pin and pin-to-ground tolerant at every pin
  • Allegro Sensor Bias LDO

Part Number Specifications and Availability

Part Number Package Type Temperature RoHS
Part Composition /
RoHS Data
Comments Samples Check Stock
A4480KLJTR-T 8-lead SOIC -40°C to 150°C Yes View Data Contact your
local sales rep
Distributor Stock
APEK4480KLJ-01-MH DEMO BOARD -40°C to 150°C No -- Contact your
local sales rep
Distributor 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.

Allegro LJ SOIC with exposed pad 8-pin package


 8-pin SOIC with exposed thermal pad (suffix LJ)