LD1084V33

Overview

The LD1084V33 is a fixed-output low-drop positive voltage regulator from the STMicroelectronics LD1084 series. It provides a nominal output voltage of 3.3 V with a guaranteed maximum output current of 5 A. The device features a typical dropout voltage of 1.3 V at full load and maintains an output tolerance of ±1% at 25°C, expanding to ±2% across the full temperature range. It operates within a DC input voltage range up to 30 V and supports junction temperatures from -40°C to +125°C. Quiescent current is typically 10 mA, and it includes internal thermal and short-circuit protection mechanisms.

Feature Summary

• Provides fixed 3.3 V output with high efficiency as quiescent current flows into the load
• Capable of delivering up to 5 A output current with tight voltage tolerance
• Features internal power dissipation and thermal limit protections
• Compatible with standard adjustable three-terminal regulator pinouts

Applications

• General-purpose power supply regulation for embedded systems
• Pre-regulator stages for switching regulators
• On-card regulation for distributed power architectures

Procurement Notes

Verify the specific package variant (TO-220, D2PAK, or D2PAK/A) required for your design, as mechanical dimensions differ. Confirm that the fixed 3.3 V output aligns with system requirements, as this part number does not support adjustable configurations. Ensure adequate thermal management is planned given the 5 A current capability and internal thermal limiting characteristics.

Selection Notes

Select this component when a stable 3.3 V rail is needed with high current capacity exceeding standard linear regulators. It serves as a direct pin-compatible replacement for older adjustable regulators while offering superior dropout performance. Consider the TO-220 package for through-hole mounting or D2PAK variants for surface-mount applications requiring efficient heat dissipation.

Part Context

The LD1084 series comprises low-dropout positive voltage regulators available in both adjustable and fixed output versions. The LD1084V33 specifically denotes the fixed 3.3 V configuration. This family is designed to replace traditional PNP-based regulators by improving efficiency and reducing dropout voltage, making it suitable for battery-powered and noise-sensitive applications.

Replacement Considerations

LD1084DT33

FAQ

Does the LD1084V33 require a minimum load current?

No, unlike some older regulators, the LD1084V33 does not require a minimum load current to maintain regulation stability.

What is the maximum input voltage for this device?

The absolute maximum DC input voltage rating for the LD1084V33 is 30 V.