LD39200PUR

Overview

The LD39200PUR is a positive adjustable linear regulator from STMicroelectronics, delivering up to 2 A output current with an input voltage range of 1.25 V to 6.0 V. It features ultra-low dropout performance, typically 130 mV at full load, and maintains high power supply rejection ratio (PSRR) of 70 dB at 1 kHz. The device includes reverse current protection, short-circuit constant current limit, and thermal shutdown. Output accuracy is 1% at 25 °C and 2% across the full temperature range. It operates within a junction temperature range of -40 °C to 125 °C and is housed in a compact 6-DFN (3x3 mm) package.

Feature Summary

• Ultra-low dropout voltage ensures efficient regulation under minimal headroom conditions
• High PSRR provides effective noise suppression for sensitive analog circuits
• Integrated reverse current protection prevents backflow when input is lower than output
• Dedicated enable pin allows precise control over power consumption states

Applications

• Telecom infrastructure power supplies
• Consumer electronics portable devices
• Computers and peripheral systems

Procurement Notes

Verify the specific suffix 'PUR' corresponds to the 6-DFN package and tape-and-reel orientation before ordering. Confirm that the adjustable output version meets your required voltage step resolution. Ensure compatibility with ceramic output capacitors as specified in the datasheet stability requirements. Check RoHS compliance status if restricted substances are mandated for your assembly process.

Selection Notes

Select this component when high current capability and low dropout are critical alongside noise-sensitive applications. The adjustable output offers flexibility for various rail voltages starting from 0.5 V. Consider the DFN6 package size constraints against thermal dissipation needs at maximum load. Verify that the 125 °C junction temperature rating aligns with your system's ambient operating environment.

Part Context

This part belongs to the LD39200 series of low-dropout regulators designed for high-performance applications. It complements other LDOs in the portfolio by offering higher current capacity compared to lower-power variants. The series targets markets requiring stable power delivery in compact form factors, such as mobile and telecom equipment.

Replacement Considerations

Direct substitutes include other STMicroelectronics LDOs with similar 2 A ratings and DFN6 packaging, such as the LD39200M5R or LD39200S5R, provided pinouts and electrical characteristics match exactly. Cross-vendor replacements require careful verification of dropout voltage, PSRR curves, and stability requirements with ceramic capacitors.