LD1084V25

Overview

The LD1084V25 is a fixed-output low-drop positive voltage regulator manufactured by STMicroelectronics. It provides a nominal output voltage of 2.5 V with a guaranteed maximum output current of 5 A. The device operates within an input voltage range up to 30 V and maintains performance across a wide operating temperature range from -40 °C to +125 °C. Dropout voltage is typically 1.3 V at full load, with a maximum of 1.5 V. Output tolerance is specified at ±1% at 25 °C and ±2% over the full temperature range. Quiescent current is typically 10 mA.

Feature Summary

• Pin-to-pin compatible with standard adjustable three-terminal regulators while offering improved dropout and output tolerance performance.
• Quiescent current flows into the load rather than being wasted, thereby increasing overall system efficiency compared to PNP regulators.
• Includes internal power limiting and thermal shutdown protection mechanisms for enhanced reliability under fault conditions.

Applications

• SCSI-2 active termination using the 2.85 V variant (LD1084#25)
• General-purpose linear power supply regulation
• Pre-regulator stages for switching converters

Procurement Notes

Verify component authenticity through authorized distribution channels due to potential counterfeit risks. Confirm package integrity upon receipt, as the TO-220 housing requires proper handling to prevent mechanical damage. Ensure compliance with RoHS directives if environmental regulations apply to your specific deployment scenario. Cross-reference datasheet revision history for any updates to electrical characteristics or ordering codes before finalizing procurement orders.

Selection Notes

Select this regulator when a stable 2.5 V rail is required with high current capability in a through-hole configuration. Consider the thermal resistance values for heat dissipation planning, as junction-to-ambient resistance is 50 °C/W. Evaluate input voltage headroom against the 1.5 V maximum dropout specification to ensure regulation stability under varying load conditions. Verify capacitor requirements for stability, noting that a minimum output capacitance is necessary for proper operation.

Part Context

The LD1084V25 belongs to the LD1084xx family of 5 A low-dropout positive voltage regulators. This series includes both adjustable and fixed-output versions such as 5 V and 12 V variants. The family is designed to replace older three-terminal adjustable regulators, offering tighter output tolerances and better dropout performance. All devices share similar internal protection features and are available in the TO-220 package format.

Replacement Considerations

Direct pin-compatible replacements include other LD1084 fixed-voltage variants like LD1084V50 or LD1084V12 if different output voltages are needed. Adjustable versions such as LD1084V can be used with external resistors to achieve custom voltage levels. Ensure substitute components match the TO-220 package dimensions and thermal characteristics for seamless integration.