LDLN030G33R

Overview

The LDLN030G33R is a 300 mA very low-dropout voltage regulator from STMicroelectronics, designed for input voltages ranging from 1.6 V to 5.5 V. It features ultra-low output noise of 7.5 µVRMS and high PSRR (80 dB @ 100 Hz). The device maintains a typical dropout voltage of 150 mV at full load and offers a quiescent current of just 16 µA at no-load, extending battery life. It includes logic-controlled shutdown with consumption below 1 µA, Power Good indication, and protections against short-circuit, undervoltage lockout, and thermal overload. Available in TSOT23-5L package.

Feature Summary

• Ultra-low noise performance suitable for sensitive analog loads
• Logic-controlled electronic shutdown for extended standby operation
• Integrated protection suite including soft-start and thermal regulation

Applications

• Noise-sensitive loads such as ADCs and VCOs in mobile devices
• Wireless LAN devices requiring clean power supplies
• Battery-powered applications demanding extended standby time

Procurement Notes

Verify the specific output voltage configuration associated with the G33 suffix against official datasheets, as ordering suffixes may denote fixed voltage options or packaging variations. Confirm that the TSOT23-5L package availability aligns with current production status. Ensure compatibility with ceramic capacitors for stability. Cross-reference the part number with manufacturer documentation to validate functional specifications before procurement.

Selection Notes

Select this regulator for applications requiring minimal noise injection into sensitive circuits like RF front-ends or precision converters. The low quiescent current makes it ideal for battery-operated systems where standby power consumption is critical. Ensure the input voltage range covers the system's operational requirements and that the load current does not exceed 300 mA. Verify thermal dissipation capabilities within the TSOT23-5L package for the intended ambient conditions.

Part Context

The LDLN030 series belongs to STMicroelectronics' lineup of low-dropout linear regulators optimized for portable electronics. These devices are engineered to provide stable, clean power rails while minimizing energy waste. The family emphasizes low noise and high power supply rejection ratio (PSRR) to support high-performance analog and mixed-signal components in compact form factors.

Replacement Considerations

Consult official obsolete product notices for confirmed substitute part numbers. Generic replacements must match the 300 mA output current, 1.6 V–5.5 V input range, and TSOT23-5L package. Verify equivalent noise, PSRR, and protection features to ensure circuit compatibility.