L4957AD3.3TR

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

The L4957AD3.3TR is a fixed-output Ultra Low Drop Output (ULDO) linear regulator manufactured by STMicroelectronics, delivering a stable 3.3V output with a maximum current capacity of 5A. It operates within an input voltage range of 3V to 14V and utilizes a TO-252-3 surface-mount package. Key electrical specifications include a typical on-resistance of 200mΩ at 125°C, a maximum dropout voltage of 0.6V at 2A load, and a quiescent current of 0.6mA across all load conditions. The device supports an operating temperature range from -40°C to +150°C.

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

• Integrates an internal N-channel MOSFET for low dropout performance in low voltage applications
• Includes short circuit protection and thermal shutdown mechanisms for enhanced reliability
• Maintains excellent load regulation with minimal quiescent current consumption

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

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

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

Verify the specific suffix 'TR' indicates tape-and-reel packaging configuration when sourcing. Confirm the part number corresponds to the 3.3V fixed output variant within the L4957A family. Ensure compatibility with TO-252-3 footprint requirements during procurement planning.

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

Select this component for applications requiring high current delivery up to 5A with minimal voltage drop from a 3V to 14V input source. It is suitable where efficient conversion from 3.3V rails to lower voltages like 2.5V or 1.5V is needed. Consider its thermal characteristics and package type for heat dissipation needs in dense PCB layouts.

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

This device belongs to the L4957A series of ultra-low dropout linear regulators designed for cost-effective and efficient power conversion. The series is engineered for processor and logic supply applications, offering fast transient response that minimizes required output capacitance while maintaining stability under varying load conditions.

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

Compatible substitutes within the same family include L4957AD1.8TR, L4957AD2.5TR, and L4957AV3.3. Verify pinout compatibility and ensure the replacement matches the required output voltage and current rating for the specific application design.