LDK120PU25R

Overview

The LDK120PU25R is a fixed-output linear low-dropout regulator manufactured by STMicroelectronics, delivering a maximum output current of 200 mA. It provides a fixed output voltage of 2.5 V with an input supply range spanning from 1.9 V to 5.5 V. The device features a typical dropout voltage of 100 mV at a 100 mA load and maintains stability using only a 1 μF ceramic capacitor on the output. It incorporates logic-controlled electronic shutdown functionality, reducing total current consumption to less than 1 μA in off mode.

Feature Summary

• Ultra-low dropout performance ensures efficient regulation under minimal voltage headroom conditions
• Logic-controlled enable pin allows precise power management with ultra-low shutdown current consumption
• Integrated short-circuit constant current limiting and thermal protection safeguard against overload events

Applications

• Low-power battery-operated portable devices requiring extended runtime
• Always-on automotive body and interior functions sensitive to quiescent current
• Noise-sensitive analog circuits within industrial control systems

Procurement Notes

Verify the specific suffix PU25R to confirm the 2.5 V fixed output voltage and 6-DFN package configuration. Ensure compatibility with standard surface-mount assembly processes for the 1.2 x 1.3 mm footprint. Confirm RoHS3 compliance status for environmental regulations. Validate that the required 1 μF ceramic output capacitor meets the stability requirements specified in the official datasheet.

Selection Notes

Select this component when a stable 2.5 V rail is required from a variable input source between 1.9 V and 5.5 V. The low quiescent current makes it suitable for energy-constrained designs. Verify that the application environment stays within the -40°C to 125°C operating temperature range. Consider the 6-DFN package size constraints during PCB layout planning.

Part Context

This part belongs to the LDK120 series of ultra-low dropout regulators designed for high efficiency and low noise. The series offers various fixed output voltages and adjustable versions to support diverse system architectures. Manufactured by STMicroelectronics, these regulators are optimized for compact designs using small ceramic capacitors, distinguishing them from older LDO technologies requiring larger electrolytic components.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation.