L4957AD3.3

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

The L4957AD3.3 is an Ultra Low Drop Output (ULDO) linear regulator from STMicroelectronics, delivering up to 5A with a fixed 3.3V output. It operates within a 3V to 14V input range and features an internal N-channel MOSFET with a typical Rdson of 200mΩ at Tj = 125°C. The device ensures stability with a minimum 22µF output capacitor and offers excellent load regulation. Key protections include short circuit and thermal shutdown, while quiescent current remains low at 0.6mA across all loads.

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

• Ultra-low dropout performance suitable for low voltage applications
• Internal N-channel MOSFET provides high efficiency and fast transient response
• Integrated short circuit and thermal shutdown protection mechanisms

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

• Motherboard power supplies
• Processor I/O and core supplies
• Low voltage memory and chipset supplies
• Graphic and sound cards
• Post regulator for switching mode power supplies

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

Verify the specific suffix against official documentation to confirm package type and tape-and-reel configuration. Ensure compatibility with required input voltage ranges and thermal management strategies for 5A operation. Cross-reference datasheet revisions to validate pinout and electrical characteristics before integration into final designs.

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

Select this component for applications requiring high current delivery with minimal voltage drop from a 3.3V rail. It is ideal for converting higher bus voltages down to lower logic levels efficiently. Consider thermal dissipation requirements when operating near maximum current limits in enclosed environments.

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

Part of the L4957A family of ULDO regulators designed for cost-effective power conversion. Utilizes MultiPower BCD technology for robust performance in mixed-signal environments. Suitable for replacing older linear regulators where size and efficiency are critical constraints in mobile and computing systems.

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

Compatible substitutes within the same family include L4957AD1.5, L4957AD1.8, and L4957AD2.5, which share identical pinouts and protection features but offer different fixed output voltages.