LD39100PU33R

Overview

The LD39100PU33R is a fixed-output low-dropout linear voltage regulator manufactured by STMicroelectronics. It provides a fixed output voltage of 3.3 V with a maximum continuous output current of 1 A. The device operates within an input voltage range of 1.5 V to 5.5 V and features a typical dropout voltage of 200 mV at full load, with a maximum specified at 400 mV. Quiescent current is typically 20 µA at no load and 200 µA at 1 A load, while shutdown current is less than 1 µA. The unit includes short-circuit protection, thermal overload protection, and logic-controlled enable functionality. It is housed in a 6-lead DFN (3x3 mm) package with wettable flanks.

Feature Summary

• Ultra-low quiescent current consumption for extended battery life in portable devices
• Low-noise performance without requiring external bypass capacitors
• Logic-controlled electronic shutdown mode for system power management
• Integrated short-circuit constant current limiting and thermal protection

Applications

• Battery-powered consumer electronics
• Portable medical equipment
• Wireless communication modules
• Low-power sensor nodes

Procurement Notes

Verify the specific suffix 'RY' versus 'R' against the manufacturer's official datasheet to confirm package variations such as wettable flank availability. Confirm RoHS compliance status and humidity sensitivity level prior to PCB assembly planning. Ensure the ordering part number matches the exact output voltage tolerance and package type required for the design.

Selection Notes

Select this component when a stable 3.3 V rail is needed from a single-cell lithium or alkaline battery source. The wide input range down to 1.5 V allows operation until battery depletion. The low noise characteristic makes it suitable for sensitive analog circuits. Verify that the application does not require reverse current protection, which is not included in this specific model.

Part Context

This regulator belongs to the LD39100 series, designed for ultra-low power applications. It shares the same pinout and general architecture as other variants in the family but offers specific output voltage and packaging options. The DFN6 package facilitates compact board designs while maintaining adequate thermal dissipation for 1 A operation.

Replacement Considerations

NCP692MN33T2G is a documented substitute option available from onsemi.