L4957AD2.5

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

The L4957AD2.5 is an Ultra Low Drop Output (ULDO) linear regulator manufactured by STMicroelectronics, delivering a fixed 2.5V output with up to 5A current capability. It operates within a 3V to 14V input voltage range and features an internal N-channel MOSFET with a typical on-resistance of 200mΩ at Tj = 125°C. The device ensures excellent load regulation and includes thermal shutdown protection. Designed for low dropout applications, it minimizes the required output capacitance, requiring a minimum of 22µF for stability across all load conditions.

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

• Ultra-low dropout performance enabled by an internal N-channel MOS power switch
• High current delivery capability up to 5A for processor and logic supplies
• Integrated thermal shutdown for enhanced operational safety

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

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

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

Verify the specific suffix 'AD' against the manufacturer's official datasheet to confirm the package type and temperature grade. Ensure that the ordering code matches the exact fixed output voltage requirement of 2.5V. Cross-reference the part number with the latest product status to confirm availability and lifecycle stage before finalizing procurement plans.

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

Select this component when a high-current, low-dropout solution is required for converting 3.3V or 5V rails to lower voltages like 2.5V. It is suitable for designs prioritizing transient response speed and minimizing external capacitor size. Verify that the input voltage remains within the 3V to 14V range and that the thermal management strategy accommodates the power dissipation at maximum load currents.

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

This device belongs to the L4957A series of ULDO regulators from STMicroelectronics. The series offers fixed output options including 1.5V, 1.8V, 2.5V, and 3.3V. These regulators are designed using Multipower BCD technology to provide efficient power conversion in space-constrained and high-performance electronic systems requiring stable low-voltage supplies.

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

Check for other variants within the L4957A family such as L4957AV2.5 or L4957AD1.8 if different output voltages or packages are acceptable. Verify pin compatibility and thermal characteristics before substituting with other 5A LDOs from different manufacturers.