STMicroelectronics LD39200DPUR

Overview

LD39200DPUR from STMicroelectronics is a 2 A ultra-low-dropout linear regulator with fixed 3.3 V output, 130 mV typical dropout at full load, ±1 % output accuracy at 25 °C, 70 dB PSRR at 1 kHz, and reverse current protection - designed for point-of-load regulation in telecom infrastructure and industrial power subsystems.

For engineers reviewing the LD39200DPUR datasheet, LD39200DPUR pinout, LD39200DPUR application, or LD39200DPUR equivalent, this page delivers verified package mapping (DFN8, 4 × 4 mm), confirmed thermal shutdown (170 °C), Power Good flag behavior (0.92×VOUT rising threshold), EN logic thresholds (0.5 V low / 1.2 V high), and ceramic-capacitor stability (10 µF).

Technical Context

The LD39200DPUR employs a PMOS pass transistor architecture enabling ultra-low dropout and inherent reverse current blocking without external components. Its bandgap-referenced error amplifier drives the gate of the PMOS device to maintain precise output regulation across input voltage (1.25–6.0 V) and load (0–2 A) variations.

It integrates dedicated circuitry for Power Good monitoring (open-drain PG pin with hysteresis), enable control with 10 nA shutdown current, and dual protection: constant-current short-circuit limiting (3.5 A typ.) and thermal shutdown with 20 °C hysteresis (170 °C trip, 150 °C recovery).

Key Specifications

Pinout & Package

LD39200DPUR is housed in a thermally enhanced DFN8 (4 × 4 mm) package with exposed pad for improved heat dissipation (R_THJA = 40 °C/W). Pin assignment follows Table 2 of DS10079 Rev 3.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS7A4700RGWR and ADM7172ACPZ-3.3-R7, LD39200DPUR offers the only combination of fixed 3.3 V output, integrated reverse current blocking, DFN8 pin compatibility, and 130 mV dropout - making it optimal for cost-sensitive, space-constrained telecom and industrial POL designs requiring robustness over ultra-low noise.

Availability

LD39200DPUR is available at Aetrix Electronics and suitable for telecom infrastructure, industrial PLCs, and medical imaging sensor interfaces requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for LD39200DPUR 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 silicon solutions for automotive, industrial, and power management applications.

LD39200DPUR belongs to ST's high-performance LDO portfolio targeting medium-current, ultra-low-noise, and ultra-low-dropout requirements in telecom and industrial point-of-load systems - emphasizing thermal robustness, reverse current safety, and ease of integration.

FAQ

What is the minimum input voltage required for LD39200DPUR to regulate 3.3 V output?

The LD39200DPUR requires an input voltage ≥ 3.43 V to maintain regulation at 3.3 V output under full 2 A load, based on its 130 mV typical dropout voltage. At light loads, input can be as low as 3.31 V (100 mV dropout), but design margin should account for worst-case 250 mV dropout per datasheet Table 5.

Does LD39200DPUR require an external resistor divider for 3.3 V operation?

No. LD39200DPUR is the fixed-output version (3.3 V) - the ADJ/SENSE pin must be connected directly to the OUT pin per Table 2 and Section 6.4 of DS10079. Resistor dividers are only used with the adjustable LD39200PUR variant.

How does the Power Good (PG) pin behave during startup and fault conditions?

The PG pin is open-drain and remains low until V_OUT rises above 0.92×3.3 V (≈3.04 V), then transitions to high-impedance. If V_OUT drops below 0.80×3.3 V (≈2.64 V) due to overload or input collapse, PG pulls low again - providing unambiguous power-valid and fault-signaling capability.

Can LD39200DPUR safely drive a 10 µF ceramic output capacitor?

Yes. The LD39200DPUR is explicitly characterized and stabilized for use with 10 µF ceramic capacitors (X5R/X7R) on the output, as confirmed in Section 3 (Typical Application) and Figure 20 (Stability Plan) of DS10079. No additional ESR or damping components are needed.