LD59100PUR

Overview

The LD59100PUR is a 1 A low-dropout linear regulator from STMicroelectronics, utilizing an N-MOS topology to minimize pass-element resistance. It operates within an input voltage range of 2.2 V to 5.5 V and features an adjustable output voltage starting from 1.2 V. The device maintains ultra-low dropout characteristics, typically 200 mV at full load, and offers high power supply rejection ratio (PSRR) performance across wide frequency bands. It ensures stability with output capacitors as small as 1 μF and includes integrated protection mechanisms such as current limiting and thermal shutdown.

Feature Summary

• N-MOS topology enables ultra-low dropout voltage operation even under minimal input supply conditions
• High PSRR performance suitable for noise-sensitive secondary regulation applications
• Integrated enable function reduces overall current consumption during shutdown mode
• Built-in protection against overcurrent, overheating, and reverse output current flow

Applications

• Secondary voltage regulation for noise-sensitive electronic circuits
• Power management in portable devices requiring efficient linear regulation
• General-purpose low-dropout regulation in industrial environments

Procurement Notes

Verify the specific suffix PUR corresponds to the 8-DFN package configuration when sourcing. Confirm that the required output voltage adjustment range meets the minimum 1.2 V threshold specified for this variant. Ensure compatibility with the 1 μF minimum output capacitance requirement for stable operation. Cross-reference the manufacturer datasheet for exact pinout and thermal pad specifications before finalizing procurement.

Selection Notes

Select this component when a 1 A current capacity is required alongside ultra-low dropout performance. The N-MOS architecture is preferred for maintaining efficiency at low input-to-output voltage differentials. Consider the high PSRR if the application involves sensitive analog sections powered by noisy rails. Verify that the adjustable output range starting at 1.2 V aligns with the system's voltage requirements.

Part Context

This part belongs to the LD59100 family of ultra-low-dropout regulators designed for robust performance in various operating environments. The series emphasizes high power supply rejection and fast transient response, making it distinct from standard LDOs. The PUR designation indicates the specific surface-mount packaging used for integration into compact printed circuit board layouts.

Replacement Considerations

Direct substitutes may include other 1 A N-MOS LDOs from STMicroelectronics or compatible manufacturers offering similar dropout and PSRR specifications. Verify package compatibility and pinout alignment before substitution. Ensure the replacement supports the same input voltage range and provides equivalent thermal protection features.