A4481: 5 VOUT, 50 mA Automotive Linear Regulator with 50 V Load Dump and Short-to-Battery Protection

A4481是一个低压差线性稳压器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.

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Power supplies for:

• Microcontrollers
• Transceivers (CAN, LIN, etc.)
• Sensors

• Automotive AEC-Q100 qualified
• 5.25 to 40 V_INoperating 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
• Allegro Sensor Bias LDO