LDFM33PUR

Overview

The LDFM33PUR is a fixed-output linear voltage regulator manufactured by STMicroelectronics, providing a stable 3.3V output with a maximum current capacity of 500mA. It operates within an input voltage range of 2.5V to 16V and features a typical dropout voltage of 0.3V at full load. The device incorporates comprehensive protection mechanisms including overcurrent limiting, thermal shutdown, and under-voltage lockout (UVLO). It supports logic-controlled enable functionality and provides a power-good signal. The component is housed in a compact 6-DFN (3x3mm) package with an exposed pad for enhanced thermal performance.

Feature Summary

• Ultra-low dropout voltage design ensures efficient operation across wide input ranges
• Integrated power-good indicator and logic-controlled enable pin for system management
• Robust protection suite includes overcurrent, thermal shutdown, and under-voltage lockout
• High output accuracy with low noise characteristics suitable for sensitive analog circuits

Applications

• Low voltage microprocessor power supply regulation
• Memory subsystem power conditioning
• Battery-powered portable electronic devices
• General purpose linear regulation in space-constrained PCB designs

Procurement Notes

Verify the specific suffix 'PUR' corresponds to the RoHS compliant tape-and-reel packaging configuration required for your assembly line. Confirm that the 6-DFN footprint matches your board layout, paying attention to the exposed thermal pad requirements for adequate heat dissipation during high-load operations.

Selection Notes

Select this component when a fixed 3.3V rail is required with moderate current demands up to 500mA. It is suitable for applications prioritizing low quiescent current and small form factor over ultra-high precision or adjustable output flexibility. Ensure the input voltage remains within the specified 2.5V to 16V range to maintain proper regulation and protection function activation.

Part Context

This part belongs to the LDFM series of ultra-low dropout linear regulators from STMicroelectronics. The series offers various fixed and adjustable output voltages with similar protection features. The LDFM33PUR specifically denotes the 3.3V fixed output variant in the DFN package, distinguishing it from other package options like PPAK or DPAK which may have different thermal or pin-out characteristics.

Replacement Considerations

LDFM33PVR is documented as a parameter-equivalent alternative within the same product family.