STMicroelectronics LD39020DTPU15R

Overview

LD39020DTPU15R from STMicroelectronics is a 200 mA ultra-low-dropout linear voltage regulator with 1.5 V fixed output, 200 mV typical dropout at 200 mA, ±2.0 % output accuracy at 25 °C, and logic-controlled enable/disable functionality. It operates from 1.5 V to 5.5 V input and delivers stable power to low-power RF and sensor rails in compact portable devices.

For engineers reviewing the LD39020DTPU15R datasheet, LD39020DTPU15R pinout, LD39020DTPU15R application, or LD39020DTPU15R equivalent, key selection criteria include dropout performance at light/heavy load, quiescent current in active and shutdown modes, ceramic capacitor compatibility (≥0.47 µF), thermal behavior in DFN4 1x1 package, and integrated soft-start/output discharge functionality.

Technical Context

The LD39020DTPU15R employs a PMOS pass transistor architecture enabling ultra-low dropout (200 mV typ. @ 200 mA) and near-zero reverse current during shutdown. Its bandgap-referenced error amplifier ensures tight DC regulation across –40 °C to 125 °C, while internal soft-start limits inrush current without external components.

It integrates an optional NMOS output discharge switch (enabled in DT variants like this part), activated when EN is pulled low, ensuring rapid VOUT decay for system-level power sequencing. PSRR reaches 80 dB at 1 kHz and 55 dB at 100 kHz, supporting noise-sensitive analog and RF circuitry.

Key Specifications

Pinout & Package

LD39020DTPU15R is packaged in DFN4 1x1 (1.0 mm × 1.0 mm, 0.4 mm height), optimized for ultra-dense portable PCBs. Thermal pad must be soldered to PCB ground plane for thermal performance (R_thJA = 250 °C/W).

Key Features

Applications

Equivalent & Alternatives

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

Compared with XC6210B152MR-G and RT9080L-15PU5, LD39020DTPU15R uniquely combines 200 mA capability, integrated discharge, 0.03 µA shutdown, and AEC-Q200-compatible construction-making it optimal for space-constrained, fast-sequencing portable systems demanding robustness and ultra-low leakage.

Availability

LD39020DTPU15R is available at Aetrix Electronics and suitable for mobile phones, digital still cameras, wearable health monitors, and Bluetooth audio earbuds requiring stable component supply with consistent parametric performance across production lots.

Supply support for LD39020DTPU15R 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 consumer markets since 1987.

LD39020 belongs to ST's high-accuracy, ultra-low-I_Q LDO family targeting battery-powered portable electronics where efficiency, size, and power sequencing integrity are critical design constraints.

FAQ

What is the minimum output capacitance required for stability?

The LD39020DTPU15R is stable with ≥0.47 µF ceramic output capacitance (X5R/X7R dielectric). While the control loop remains functional down to 220 nF, 0.47 µF is the minimum recommended value to ensure stability across temperature, input voltage, and load variations per Figure 17 in DS9956.

Does LD39020DTPU15R support adjustable output voltage?

No. LD39020DTPU15R is a fixed-output variant delivering precisely 1.5 V. ST offers adjustable versions (e.g., LD39020DTxxR with external resistor divider), but this specific order code has factory-trimmed 1.5 V output and no feedback pins.

How does the output discharge function operate?

When EN is driven low, the internal 100 Ω NMOS discharge switch connects VOUT to GND, actively discharging the output capacitor. This occurs within microseconds and is confirmed in Section 6.2 of DS9956; it is enabled only in "DT" suffix variants like this part.

Is the DFN4 1x1 package RoHS and REACH compliant?

Yes. The LD39020DTPU15R DFN4 1x1 package carries ST's ECOPACK2 environmental compliance certification, meeting RoHS Directive 2011/65/EU and REACH Regulation (EC) No. 1907/2006, with lead-free matte tin termination and halogen-free molding compound.