L4957AD1.5

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Overview

The STMicroelectronics L4957AD1.5 is a fixed-output ultra-low dropout linear regulator delivering up to 5A with a 1.5V output voltage. It operates within an input range of 3V to 14V and features a typical on-resistance of 200mΩ at Tj=125°C. The device provides excellent load regulation, thermal shutdown protection, and maintains stability with a minimum 22µF output capacitor.

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Feature Summary

• Ultra-low dropout performance utilizing an internal N-channel MOS power stage
• Integrated thermal shutdown for overtemperature protection
• High current capability suitable for processor and logic supply conversion

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Applications

• Motherboard power distribution
• Processor I/O and core supplies
• Low voltage memory and chipset supplies
• Post-regulator for switching mode power supplies

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Procurement Notes

Verify the specific suffix 'D' against official datasheets to confirm package type and temperature grade. Confirm availability status as this component may be discontinued or restricted in certain regions. Ensure compatibility with existing PCB footprints and thermal management requirements before finalizing procurement plans.

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Selection Notes

Select this regulator when high current delivery above 5A is not required but low dropout efficiency is critical. It serves as a cost-effective solution for stepping down 3.3V rails to lower voltages like 1.5V or 2.5V. Consider the TO-252 package constraints and ensure adequate heat dissipation for continuous 5A loads.

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Part Context

This part belongs to the L4957A family of Ultra Low Drop Output linear regulators from STMicroelectronics. The family includes variants with different fixed output voltages such as 1.8V, 2.5V, and 3.3V, all sharing similar electrical characteristics and packaging options for versatile power management applications.

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Replacement Considerations

Direct substitutes within the same family include L4957AV1.5 (TO-220 package) and L4957AD1.8 (1.8V output). Verify pinout compatibility and thermal resistance differences when replacing the TO-252 package with alternative form factors.