LD39020ATPU32R

Overview

The LD39020ATPU32R is a fixed-output linear voltage regulator from STMicroelectronics, providing a stable 3.2 V output with a maximum current of 200 mA. It operates within an input voltage range of 1.5 V to 5.5 V and features an ultra-low dropout voltage of typically 200 mV at full load. The device incorporates very low quiescent current consumption of 20 µA and achieves high power supply rejection ratio (PSRR) of 80 dB at 1 kHz. It includes internal soft-start, constant current limiting, and thermal protection, housed in a compact 4-DFN (1x1 mm) package.

Feature Summary

• Ultra-low dropout voltage operation for efficient battery-powered applications
• Logic-controlled electronic shutdown function enabling deep sleep modes
• Internal soft-start circuit limits inrush current during startup
• Compatible with small ceramic output capacitors for space saving

Applications

• Battery-operated portable devices requiring low power consumption
• Space-constrained embedded systems utilizing DFN packaging
• Low-noise analog circuits requiring high PSRR performance
• Mobile communication modules needing reliable voltage regulation

Procurement Notes

Verify the specific suffix 'A' indicates the ±0.5% output voltage tolerance version when ordering. Confirm the 'TPU32R' designation corresponds to the 3.2 V fixed output and tape-and-reel packaging format. Ensure compatibility with 4-DFN footprint requirements in your PCB layout design before finalizing procurement quantities.

Selection Notes

Select this component when a precise 3.2 V rail is required with minimal voltage drop across the regulator. The A-version offers tighter output voltage accuracy compared to standard variants. Consider the 4-DFN package for superior thermal dissipation and smaller board area compared to SOT23-5L alternatives. Evaluate the 200 mA limit against peak load currents to ensure adequate headroom.

Part Context

This part belongs to the LD39020 family of low-dropout regulators designed for ultra-low power applications. The series is characterized by its ability to operate with ceramic capacitors, simplifying bill-of-materials. The LD39020ATPU32R specifically targets designs needing high precision and low noise in a miniature form factor, serving as a key PMIC solution for modern handheld electronics.

Replacement Considerations

LD39020ADTPU32R serves as a direct functional substitute with identical electrical characteristics but potentially different manufacturing lot specifications. Verify pinout compatibility between DFN packages before substitution. Cross-reference with other STMicroelectronics LDOs only if package or voltage tolerance differences are acceptable.