STMicroelectronics LDFPVR

Overview

LDFPVR from STMicroelectronics is an adjustable 1 A very low-dropout linear regulator in DFN6-2x2 package, operating from 2.6 V to 16 V input and delivering output voltages down to 0.8 V with ±1% precision at 25 °C. It features logic-controlled shutdown (EN pin), Power Good (PG) open-drain output, 500 mV max dropout at 1 A, 200 μA typical quiescent current, and internal thermal/current protection - designed for powering low-voltage microprocessors and memory in space-constrained portable systems.

For engineers reviewing the LDFPVR datasheet, LDFPVR pinout, LDFPVR application, or LDFPVR equivalent, key selection criteria include its 0.8 V adjustable output capability, fast load transient response, ±1.5% output tolerance over -40 °C to 125 °C, PG threshold accuracy (±0.12×V_ADJ), and DFN6-2x2 thermal resistance (R_thJA = 65 °C/W).

Technical Context

The LDFPVR implements a high-gain error amplifier with internal 0.8 V reference, enabling precise output regulation via external resistor divider on the ADJ pin. Its PMOS pass transistor architecture delivers ultra-low dropout and eliminates reverse current flow without requiring an external blocking diode.

Control logic includes a CMOS-compatible EN input with hysteresis-free thresholds (0.8 V low, 2 V high) and an open-drain PG output that asserts high when V_OUT reaches 92% of V_ADJ, deasserts at 80%, supporting power sequencing in multi-rail systems.

Key Specifications

Pinout & Package

Supplied in compact DFN6-2x2 (2.0 mm × 2.0 mm × 0.9 mm) package with exposed thermal pad connected to GND for enhanced heat dissipation (R_thJA = 65 °C/W).

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS7A0533PDBVR and ADM7172ACPZ-R7, LDFPVR uniquely combines 1 A adjustability, PG signaling, EN control, and DFN6-2x2 footprint - making it optimal for space-constrained, multi-rail, battery-aware systems requiring flexible voltage scaling and power sequencing.

Availability

LDFPVR is available at Aetrix Electronics and suitable for laptop core regulation, battery-powered medical sensor nodes, industrial PLC I/O modules, and set-top box HDMI interface rails requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for LDFPVR 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 microcontrollers, power management ICs, sensors, and analog components for industrial, automotive, and consumer markets.

LDFPVR belongs to ST's LDF family of very low-dropout linear regulators, engineered specifically for high-precision, low-noise, and thermally efficient power delivery in portable and embedded systems with stringent size and efficiency requirements.

FAQ

What is the minimum input voltage required for LDFPVR to regulate 0.8 V output?

The minimum input voltage is 2.6 V per datasheet specification. At 0.8 V output, the regulator requires sufficient headroom to maintain regulation - the absolute minimum VIN is V_OUT + V_DROP(min), where V_DROP depends on load and temperature. For 1 A load at 25 °C, V_DROP is typically 200 mV, so VIN ≥ 1.0 V is theoretically possible, but the device is only characterized and guaranteed from 2.6 V input.

Can the PG pin drive a microcontroller GPIO directly without external components?

No - the PG pin is open-drain and requires an external pull-up resistor (10–100 kΩ) to a valid logic-high voltage (e.g., 3.3 V or 5 V). Without this resistor, PG cannot assert high and will remain floating or low. The microcontroller GPIO must be configured as input with internal pull-up disabled to avoid contention.

Is the exposed thermal pad on the DFN6-2x2 package electrically connected, and how should it be handled on the PCB?

Yes, the exposed pad is internally connected to GND and must be soldered to a dedicated GND copper pour on the PCB. It serves both thermal and electrical functions: thermal conduction reduces junction temperature, and grounding minimizes noise coupling. Use ≥4 thermal vias (0.3 mm diameter) connecting the pad to inner-layer GND planes for optimal performance.

Does LDFPVR support remote sensing, and if so, how is it implemented?

Yes - remote sensing is supported via the ADJ pin. Connect the ADJ node to the load-side of the output capacitor (not at VOUT pin) using a separate trace. This compensates for IR drop in the output trace, improving load regulation accuracy. The resistor divider must still connect between VOUT and ADJ, with ADJ tied to the remote sense point.