STMicroelectronics LD29150PT25R

Overview

LD29150PT25R from STMicroelectronics is a 2.5 V fixed-output, 1.5 A low-dropout linear voltage regulator in PPAK package, featuring 400 mV typical dropout at full load, ±1% output accuracy over temperature, and logic-controlled electronic shutdown. It delivers stable power to microcontroller cores, FPGA I/O banks, and USB PHYs in space-constrained industrial and portable systems.

For engineers reviewing the LD29150PT25R datasheet, LD29150PT25R pinout, LD29150PT25R application, or LD29150PT25R equivalent, this page provides verified electrical parameters, thermal behavior, shutdown control timing, noise performance (100 µVRMS), and real-world use cases in post-regulation and battery-powered designs.

Technical Context

The LD29150PT25R uses a PNP pass transistor architecture enabling ultra-low dropout voltage and high current capability without external compensation. Its internal current limiting and thermal shutdown (150 °C) operate autonomously without external circuitry.

It integrates an inhibit input (VINH) that supports TTL/CMOS-compatible logic-level control for ON/OFF sequencing, with guaranteed 0.8 V logic-low threshold and 2 V logic-high threshold across –40 °C to +125 °C junction temperature.

Key Specifications

Pinout & Package

LD29150PT25R is housed in a thermally enhanced PPAK (Power Package) surface-mount package with exposed thermal pad for PCB heat dissipation. R_thJC = 8 °C/W enables efficient thermal transfer to copper planes.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar low-dropout regulator applications.

Compared with LD29150DT25R, the PT25R variant offers identical regulation performance in a smaller, thermally superior PPAK package; versus TPS7A4700RGWR, it trades ultra-low noise for higher current, integrated shutdown, and wider input voltage range - making it optimal for digitally intensive, sequenced power systems.

Availability

LD29150PT25R is available at Aetrix Electronics and suitable for industrial automation, medical instrumentation, and consumer electronics requiring stable component supply, long-term manufacturability, and RoHS-compliant packaging.

Supply support for LD29150PT25R 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.

The LD29150 series belongs to ST's high-current LDO portfolio, engineered specifically for post-regulation in mixed-signal systems where low dropout, precision, and thermal resilience are mandatory - not general-purpose regulation.

FAQ

What is the minimum input voltage required for LD29150PT25R to regulate 2.5 V at 1.5 A?

The minimum input voltage is 2.9 V, calculated from the typical 0.4 V dropout at 1.5 A load. At worst-case 0.7 V dropout (max spec), input must be ≥3.2 V to maintain regulation. Input voltage must also exceed 2.5 V by at least the dropout margin across temperature and line variations.

Does LD29150PT25R require an external capacitor on the VINH pin?

No external capacitor is required on VINH. The inhibit input is CMOS-compatible with low input current (5–10 µA), and functions as a static logic control - not a filtered or debounced signal. A pull-up or pull-down resistor may be used for default state, but no decoupling capacitor is specified or needed.

Can LD29150PT25R be used without the thermal pad connected to PCB ground?

No. The PPAK package's exposed thermal pad is electrically connected to GND and is mandatory for both thermal performance and electrical functionality. Leaving it unconnected violates the absolute maximum rating for junction temperature and risks thermal shutdown or permanent damage under load.

How does the LD29150PT25R behave during thermal shutdown?

When junction temperature reaches 150 °C, the device disables the pass element and forces output to fall. It remains latched off until temperature drops below ~135 °C (typical hysteresis), then automatically resumes regulation. No external reset or power cycle is required.