A4481 Datasheet, PDF (1/10 Pages) Allegro MicroSystems – Foldback short-circuit protection

A4481
5 V_OUT , 50 mA Automotive Linear Regulator
with 50 V Load Dump and Short-to-Battery Protection
FEATURES AND BENEFITS
• Automotive AEC-Q100 qualified
• 5.25 to 40 V_IN operating range, 50 V load dump rating
• 5 V ±1% internal LDO regulator
• Foldback short-circuit protection
• Short-to-battery protection (to 32 V, independent of V_IN)
for harness faults
• Power OK (POK) flag
• High-voltage logic level enable input (ENB) for
microprocessor control or connection directly to battery
• Pin-to-pin and pin-to-ground tolerant at every pin
Package:
8-pin SOIC with exposed thermal pad (suffix LJ)
DESCRIPTION
The A4481 is a single low-dropout linear regulator with
complete control, diagnostics, and protection features that
address many requirements of automotive applications. It
regulates input voltages from 5.25 to 40 V, down to 5 V ±1%
output voltage and is able to supply up to 50 mA of load current.
Diagnostic output from the A4481 includes Power OK (POK)
output to alert the microprocessor that a fault has occurred.
Protection features include input undervoltage lockout (UVLO),
foldback overcurrent protection, output undervoltage and
overvoltage protections (UV/OVP), and thermal shutdown
(TSD). In addition, the output is protected from a short-to-
battery event up to 32 V.
The A4481 device is available in an 8-pin SOIC package with
exposed pad for enhanced thermal dissipation. It is lead (Pb)
free, with 100% matte-tin leadframe plating.
Not to scale
APPLICATIONS
Power supplies for:
• Microcontrollers
• Transceivers (CAN, LIN, etc.)
• Sensors
VIN
Enable
Typical Application Circuit
VIN
VOUT
A4481
V_OUT = 5 V, I_OUT = 50 mA
VCC
ENB
POK
GND
A4481-DS, Rev. 1