STMicroelectronics Voltage Regulator 1.5 to 5.5 V Input Range Surface Mount Positive Polarity 4-Pin LDLN025J33R

STMicroelectronics LDLN025J33R is a high-performance voltage regulator designed for precision power management in electronic circuits. This surface mount regulator features a positive polarity configuration with a 4-pin package, offering an operating input voltage range from 1.5 V to 5.5 V. It supports output currents up to 250 mA with a very low dropout voltage of 250 mV at full load, making it suitable for compact, battery-powered devices and sensitive analog circuitry.

The device ensures ultra low output noise of 6.5 μVRMS, contributing to clean and stable voltage output under varying line and load conditions. It exhibits excellent power supply rejection ratio (PSRR) of 80 dB at 100 Hz and 60 dB at 100 kHz, which minimizes the impact of input voltage fluctuations and electromagnetic interference on the output.

Quiescent current is minimized to 12 μA at no-load and is carefully controlled even in dropout conditions to optimize power consumption, which is critical for energy-efficient applications. The regulator also includes logic-controlled electronic shutdown functionality and output discharge to enhance system control and safety.

Thermal and overcurrent protections are built-in to safeguard the device and connected circuits from abnormal conditions and ensure robust operation across the industrial temperature range from -40 °C to +125 °C. The internal soft-start feature controls the voltage ramp-up to prevent inrush currents during power-up.

Available package options include Flip-Chip4, DFN4-1x1, and SOT23-5L, supporting various board layouts and space constraints in consumer, industrial, and automotive electronics design.

This reliable and efficient voltage regulator is ideal for use in power management ICs, embedded systems, instrumentation, and other applications requiring a low-noise, low-dropout voltage supply.

Operates with input voltage from 1.5 V to 5.5 V. Output current capability up to 250 mA with low dropout voltage. Ultra low output noise of 6.5 μVRMS and high PSRR performance. Very low quiescent current optimized for power efficiency.

Includes electronic shutdown, output discharge, and soft-start features. Protected against overcurrent and thermal overload. Wide operating temperature range suitable for industrial environments. Surface mount packages: Flip-Chip4, DFN4-1x1, SOT23-5L.

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