STMicroelectronics LD39050PV10R

Overview

LD39050PV10R from STMicroelectronics is a 500 mA ultra-low-dropout linear voltage regulator with fixed 1.0 V output, operating from 1.5 V to 5.5 V input. It delivers 200 mV typical dropout at full load, 20 µA quiescent current at no load, ±2.0% output voltage tolerance at 25 °C, and low-noise operation without bypass capacitor-ideal for powering low-voltage microcontrollers and RF sections in battery-powered IoT sensors.

For engineers reviewing the LD39050PV10R datasheet, LD39050PV10R pinout, LD39050PV10R application, or LD39050PV10R equivalent, key selection criteria include dropout performance under 500 mA load, shutdown current <1 µA, ceramic-capacitor stability (1 µF COUT), Power Good signaling, and thermal/short-circuit protection in DFN6 (2x2 mm) package.

Technical Context

The LD39050PV10R implements a PMOS pass transistor architecture enabling ultra-low dropout and near-zero gate-drive loss. Its internal bandgap reference and error amplifier maintain tight regulation across –40 °C to 125 °C junction temperature, with Power Good (PG) open-drain output asserting at 92% of nominal VOUT and releasing at 80%.

It integrates logic-controlled enable (EN), thermal shutdown at 160 °C with 20 °C hysteresis, and constant-current short-circuit limiting (~700 mA typ.). Supply voltage rejection is 65 dB at 1 kHz and remains >62 dB up to 10 kHz, supporting noise-sensitive analog and digital loads.

Key Specifications

Pinout & Package

LD39050PV10R uses the DFN6 (2x2 mm) package with exposed thermal pad (must be connected to GND). Pin numbering follows top-view orientation per STMicroelectronics DocID15470 Rev 5.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar ultra-low-dropout, low-noise LDO applications.

Compared with XC6210B102MR-G and RT9080L-10GJ5, LD39050PV10R uniquely combines 20 µA I_Q, integrated PG, –40 °C to 125 °C operation, and ceramic-capacitor stability in a 2x2 mm DFN-making it optimal for space-constrained, battery-sensitive, and thermally demanding designs.

Availability

LD39050PV10R is available at Aetrix Electronics and suitable for wearable health monitors, industrial wireless sensor nodes, automotive cabin controllers, and portable medical diagnostic devices requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for LD39050PV10R 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, MCU, power, and sensor solutions for industrial, automotive, and consumer markets.

LD39050PV10R belongs to ST's high-performance LDO portfolio targeting ultra-low-power, low-noise, and thermally robust applications in battery-powered and harsh-environment electronics.

FAQ

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

The LD39050PV10R requires VIN ≥ VOUT + VDROP. With 200 mV typical dropout at 500 mA, it regulates stably from 1.2 V input. However, the absolute minimum specified VIN is 1.5 V per datasheet-ensuring guaranteed performance including line/load regulation, PSRR, and thermal margin across temperature and process variation.

Can LD39050PV10R be used with a 0.47 µF output capacitor?

No. The datasheet specifies 1 µF minimum COUT for stability with ceramic capacitors. Using 0.47 µF risks oscillation or poor transient response, as confirmed by Figure 33–34 ESR vs. capacitance stability zones. Always use ≥1 µF X5R/X7R ceramic capacitor with ≤1 Ω ESR at 100 kHz.

Is the PG pin actively driven or open-drain?

The PG pin is an open-drain NMOS output. It pulls low when VOUT falls below 80% of nominal (0.8 V), and floats high (requiring external pull-up) when VOUT rises above 92% (0.92 V). This allows flexible interfacing with 1.8 V, 3.3 V, or 5 V logic systems using appropriate pull-up voltage and resistor.

Does LD39050PV10R require an input capacitor?

Yes. A minimum 1 µF ceramic input capacitor (X5R/X7R) is required between VIN and GND, placed as close as possible to the device. This stabilizes the input rail during load transients and prevents instability caused by source impedance-especially critical when fed from high-impedance sources like battery+resistor or upstream DC-DC converter outputs.