LD39020TPU32R

Overview

The LD39020TPU32R is a high-accuracy linear voltage regulator manufactured by STMicroelectronics. It provides a maximum output current of 200 mA with an input voltage range from 1.5 V to 5.5 V. The device features a typical dropout voltage of 200 mV at full load and maintains a very low quiescent current of 20 µA at no load. The 'A' suffix indicates an output voltage tolerance of ±0.5% at 25 °C, while the standard version offers ±2.0%. It includes internal soft-start, constant current limit, and thermal protection functions. The component operates within a junction temperature range of -40 °C to 125 °C and utilizes a compact 4-XDFN package.

Feature Summary

• Ultra-low dropout voltage capability for efficient power management in battery-operated systems
• Logic-controlled electronic shutdown function enabling deep sleep modes with minimal current consumption
• Integrated protection mechanisms including overcurrent limiting, thermal shutdown, and internal soft-start circuitry

Applications

• Low-power battery-operated portable electronics
• Smartphones and tablets requiring stable voltage rails
• Wearable devices with strict space and power constraints

Procurement Notes

Verify the specific output voltage corresponding to the TPU32 suffix against official STMicroelectronics documentation before procurement. Confirm that the required package variant matches the design footprint. Ensure compatibility with ceramic output capacitors as specified in the datasheet. Cross-reference the exact part number to distinguish between standard and high-accuracy versions.

Selection Notes

Select this regulator when ultra-low quiescent current and high accuracy are critical for extending battery life. The device is suitable for applications requiring a fixed output voltage derived from a single-cell lithium battery or similar supply source. Consider the thermal performance and package size relative to the PCB layout constraints. Verify that the input voltage remains within the specified operational limits during all operating conditions.

Part Context

This component belongs to the LD39020 family of low-dropout linear regulators designed for space-constrained and power-sensitive applications. The family emphasizes high power supply rejection ratio (PSRR) and stability with small ceramic capacitors. It serves as a key power management integrated circuit (PMIC) solution for modern mobile and wearable technology platforms.

Replacement Considerations

Direct substitutes include other LD39020 variants with different fixed output voltages, such as LD39020DTPU33R or LD39020ADTPU33R, provided the electrical specifications match the system requirements. Ensure the replacement maintains the same package type and pin configuration.