SPX1581T5-L-2-5

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

The SPX1581T5-L-2-5 is a fixed positive low dropout (LDO) linear regulator manufactured by Sipex. It provides a nominal output voltage of 2.5V with a guaranteed maximum output current of 5A. The device features an extremely low dropout voltage of 500mV at full load, enabling efficient operation from standard 3.3V or 5V supply rails. It is housed in a lead-free TO-263 package with five pins, designed for high-current applications requiring precise voltage regulation and fast transient response.

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

• Guarantees 5A continuous output current capability
• Features ultra-low dropout voltage of 500mV at full load
• Includes external sense pin for enhanced load regulation accuracy
• Provides integrated overcurrent and thermal protection

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

• ATX power supplies converting 3.3V to lower voltages
• Portable Pentium processor power delivery
• Post-regulation for switching mode power supplies

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

Verify the specific suffix 'T5' corresponds to the five-pin TO-263 package configuration rather than standard three-terminal variants. Confirm that the '-L' designation indicates lead-free compliance as per manufacturer specifications. Ensure the '-2-5' segment accurately reflects the fixed 2.5V output requirement for your circuit design.

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

Select this component when high current capacity exceeding 3A is required alongside tight line and load regulation. The external sense feature makes it suitable for applications where long trace resistance causes significant voltage drop. Consider thermal management requirements due to the high current handling capabilities and associated power dissipation.

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

This part belongs to the SPX1581 series of 5A low dropout regulators. It shares architectural similarities with industry-standard devices like the LT1084 but offers superior performance metrics including lower dropout voltage and faster transient response. The series is designed to meet the demanding power requirements of modern microprocessors and digital logic circuits.

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

Direct substitutes include the LT1084-2.5 or equivalent 5A LDO regulators with similar pinouts. Verify that replacement parts support the external sense pin functionality if precise load regulation is critical. Ensure thermal characteristics and package dimensions are compatible with existing PCB layouts.