LD39020ATPU185R

Overview

The LD39020ATPU185R is a fixed-output linear voltage regulator manufactured by STMicroelectronics. It provides a fixed output voltage of 1.85 V with a maximum continuous output current of 200 mA. The device operates from an input voltage range of 1.5 V to 5.5 V and features a typical dropout voltage of 200 mV at full load. It incorporates an enable pin for logic-controlled shutdown, reducing quiescent current to below 0.1 µA in off mode. The component includes internal soft-start, overcurrent protection, and thermal shutdown. It is housed in a compact 4-DFN (1x1 mm) package with exposed pad.

Feature Summary

• Ultra-low dropout voltage operation ensures efficient power delivery across wide input ranges.
• Logic-controlled enable function allows deep sleep modes with minimal standby current consumption.
• Integrated protection mechanisms include thermal shutdown and constant current limiting.

Applications

• Low-power battery-operated portable electronic devices
• Space-constrained embedded systems requiring small footprint regulators
• Noise-sensitive analog circuits benefiting from low-noise LDO performance

Procurement Notes

Verify the specific suffix 'TPU185R' corresponds to the 1.85 V fixed output variant when sourcing. Confirm the package type matches the required 4-DFN form factor for PCB layout compatibility. Ensure the design accounts for the exposed thermal pad connection for proper heat dissipation and grounding. Check RoHS compliance status if environmental regulations apply to the final assembly.

Selection Notes

Select this component when a precise 1.85 V rail is required within a 1.5 V to 5.5 V input window. The high accuracy version offers tighter output voltage tolerance compared to standard variants. Consider the 4-DFN package constraints regarding soldering thermal profiles and copper area requirements for thermal management under maximum load conditions.

Part Context

This part belongs to the LD39020 family of ultra-low quiescent current linear regulators designed for space-saving applications. The family supports various fixed output voltages and is available in DFN4 and SOT23-5L packages. The LD39020 series targets mobile and IoT applications where power efficiency and board real estate are critical design parameters.

Replacement Considerations

Other LD39020 variants with different output voltages or package types may serve as functional substitutes if electrical specifications align. Verify that any replacement maintains the same 200 mA current rating and compatible input voltage range.