STMicroelectronics LD56020M100R

Overview

LD56020M100R from STMicroelectronics is a 1.0 V, 200 mA ultra-low-noise low-dropout (LDO) voltage regulator in SOT23-5L package, featuring 190 mV max dropout at 200 mA, ±2% output accuracy over temperature, 8.8 µVRMS noise (10 Hz–100 kHz), and logic-controlled shutdown. It powers noise-sensitive analog rails in image sensors and RF modules.

For engineers reviewing the LD56020M100R datasheet, LD56020M100R pinout, LD56020M100R application, or LD56020M100R equivalent, key selection criteria include ultra-low noise performance, sub-200 mV dropout under full load, thermal shutdown behavior, and active discharge functionality for fast power-down sequencing in portable battery-powered systems.

Technical Context

The LD56020M100R employs a PMOS pass transistor architecture enabling ultra-low dropout and near-zero reverse current during shutdown. Its internal bandgap reference and error amplifier deliver ±2% output voltage tolerance across –40 °C to +125 °C junction temperature.

It integrates logic-controlled enable (EN), thermal shutdown with 160 °C trip and 20 °C hysteresis, and active output discharge via internal NMOS switch-critical for preventing floating outputs during system reset or power cycling in multi-rail mobile SoC domains.

Key Specifications

Pinout & Package

SOT23-5L package (2.92 mm × 2.80 mm × 1.15 mm height), RoHS-compliant ECOPACK2, with exposed pad requiring GND connection for thermal and electrical integrity.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar LDO regulator applications.

Compared with XC6210B102MR-G and RT9080AL-10GB, the LD56020M100R uniquely combines ultra-low noise (8.8 µVRMS), lowest dropout (190 mV), and guaranteed active discharge - making it the only option qualified for simultaneous RF module biasing and fast power-state transitions in space-constrained mobile designs.

Availability

LD56020M100R is available at Aetrix Electronics and suitable for smartphones, image sensor modules, and VCO/RF power management requiring stable component supply, consistent parametric performance, and long-term production continuity.

Supply support for LD56020M100R includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing analog, microcontroller, power, and sensor solutions for automotive, industrial, and consumer markets.

The LD56020 belongs to ST's ultra-low-noise LDO portfolio targeting battery-powered portable electronics, specifically engineered to replace legacy regulators in noise-critical analog signal chains where PSRR and output cleanliness directly impact system-level RF performance.

FAQ

What is the minimum input voltage required for 1.0 V output at 200 mA?

The LD56020M100R requires VIN ≥ 1.19 V to maintain regulation at 200 mA load, based on its maximum 190 mV dropout specification. Below this, output voltage collapses linearly with input; operation below 1.1 V is not guaranteed per datasheet absolute maximum ratings.

Can the NC pin (Pin 4) be left unconnected on the PCB?

Yes - Pin 4 is explicitly designated "Not internally connected" in the datasheet. It may be left floating or tied to GND for mechanical stability; neither choice affects electrical performance or thermal behavior.

Does the LD56020M100R require an external resistor on the EN pin?

No - the EN pin features an internal 1 MΩ pull-down resistor. A direct GPIO connection suffices; adding an external pull-down would create parallel resistance and is unnecessary unless specific noise immunity or timing constraints demand it.

How does the active discharge function behave during shutdown?

When EN is driven low, the internal NMOS switch connects VOUT to GND, discharging the output capacitor within ~100 µs (typical). This prevents residual voltage from interfering with downstream logic states or causing unintended wake events in low-power systems.