STMicroelectronics LDFMPVR

Overview

LDFMPVR from STMicroelectronics is an adjustable-output, 500 mA very low dropout linear regulator operating from 2.5 V to 16 V input. It delivers ±1% output voltage accuracy (at 25°C), 300 mV max dropout at 500 mA, and features logic-controlled shutdown, Power Good open-drain output, and internal thermal/current protection. Designed for precision low-voltage power rails in microprocessor and memory subsystems.

For engineers reviewing the LDFMPVR datasheet, LDFMPVR pinout, LDFMPVR application, or LDFMPVR equivalent, this page provides verified technical context, validated pin functions, confirmed application use cases in portable and industrial systems, and real-world alternative selection guidance based on fixed/adjustable topology and thermal performance.

Technical Context

The LDFMPVR implements a high-gain error amplifier with adjustable reference (0.8 V nominal) to regulate output via external resistor divider. Its fast transient response-evidenced by <5 µs load step recovery and <10 µs line step settling-is enabled by internal compensation optimized for ceramic output capacitors ≥2.2 µF.

It integrates dual-threshold enable logic (0.8 V low / 2 V high), open-drain Power Good with 0.92×V_ADJ rising-edge threshold, and thermal shutdown at 170°C with 10°C hysteresis. Protection is fully autonomous: no external components required for current limiting or overtemperature shutdown.

Key Specifications

Pinout & Package

Available in RoHS-compliant DFN6-2x2 mm and DFN6-3x3 mm packages with exposed thermal pad (GND). Both variants share identical pinout and electrical behavior; DFN6-3x3 offers lower R_thJA (55°C/W vs. 65°C/W) for higher ambient operation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS7A2033PDBVR and ADM7172ACPZ-R7, the LDFMPVR uniquely balances adjustability, 500 mA capability, integrated PG signaling, and DFN6 footprint-making it optimal for space-constrained, multi-rail embedded systems where flexibility and reliability are prioritized over raw current headroom or fixed-voltage simplicity.

Availability

LDFMPVR is available at Aetrix Electronics and suitable for portable medical sensors, industrial PLC I/O modules, laptop subsystem rails, and automotive infotainment core supplies requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for LDFMPVR 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, specializing in power management, microcontrollers, and analog ICs for industrial, automotive, and consumer markets.

The LDFM series was developed to address demand for high-precision, low-dropout regulators in battery-powered and thermally constrained applications-emphasizing wide input range, minimal quiescent current, and robust protection without external components.

FAQ

What output voltage range can be set with LDFMPVR?

The LDFMPVR supports adjustable output from 0.8 V to 12 V using an external resistor divider on the ADJ pin. The reference voltage is 0.8 V ±1% at 25°C, enabling precise setting of common logic rails (1.05 V, 1.2 V, 1.8 V, 2.5 V, 3.3 V, 5 V) and custom values in 100 mV increments. Fixed-output variants are also available but LDFMPVR is exclusively adjustable.

How does the Power Good (PG) pin function in practical circuit design?

The PG pin is an open-drain output that pulls low when V_OUT is within 8% of target (0.92×V_ADJ rising, 0.8×V_ADJ falling). It requires an external 10–100 kΩ pull-up resistor to a compatible voltage rail. In practice, it sequences downstream regulators, enables clock generators, or feeds microcontroller GPIO for health monitoring-ensuring system startup only after stable regulation is achieved.

Can LDFMPVR operate with ceramic output capacitors, and what are the stability requirements?

Yes-LDFMPVR is optimized for ceramic output capacitors ≥2.2 µF. Stability requires ESR between 0.01 Ω and 1 Ω at 100 kHz, depending on capacitance value. Figure 24 in DS9220 shows the stable zone for adjustable versions: e.g., 4.7 µF ceramic must have ESR <0.3 Ω. X7R or X5R dielectrics are recommended; avoid high-ESR tantalum or aluminum electrolytics.

What thermal derating applies when using LDFMPVR in a DFN6-2x2 package at 85°C ambient?

In DFN6-2x2 (R_thJA = 65°C/W), maximum continuous output current at 85°C ambient is ~380 mA assuming 125°C junction limit: ΔT = 125 − 85 = 40°C → P_DISS = 40 / 65 ≈ 615 mW. At 3.3 V out and 5 V in, dropout loss is ~1.7 V × I_LOAD; solving 1.7 × I ≤ 0.615 gives I ≤ 362 mA. For full 500 mA, use DFN6-3x3 (R_thJA = 55°C/W) or add copper pour.