STMicroelectronics LD29300V25

Overview

LD29300V25 from STMicroelectronics is a fixed-output, 2.5 V, 3 A low-dropout linear voltage regulator with ±1% output tolerance at 25°C, 0.4 V typical dropout at 3 A, and integrated thermal/current protection. It features logic-controlled electronic shutdown, 100 µVRMS output noise (10 Hz–100 kHz), and is used in post-regulation of switching supplies and battery-powered systems requiring stable high-current bias.

For engineers reviewing the LD29300V25 datasheet, LD29300V25 pinout, LD29300V25 application, or LD29300V25 equivalent, key selection criteria include guaranteed 3 A output current, 0.4 V dropout at full load, shutdown control interface compatibility, thermal resistance (3 °C/W junction-to-case), and stability with 10 µF ceramic output capacitance.

Technical Context

The LD29300V25 employs a PNP pass transistor architecture enabling ultra-low dropout operation and high PSRR (55–70 dB at 120 Hz). Its internal reference is trimmed to ±1% over temperature, and regulation is maintained across –40°C to +125°C junction range with load currents from 10 mA to 3 A.

It integrates active current limiting and thermal shutdown with automatic recovery, plus an inhibit pin (INH) accepting TTL/CMOS logic levels (VIL ≤ 0.8 V, VIH ≥ 2 V) for precise system-level power sequencing. Ground current remains below 100 mA at 3 A load, supporting efficiency-critical designs.

Key Specifications

Pinout & Package

LD29300V25 is packaged in D2PAK (TO-263) surface-mount package with exposed thermal pad, offering 3 °C/W junction-to-case thermal resistance. The package supports high-power dissipation without heatsink under moderate ambient conditions.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS75325KTTR, LD29300V25 offers integrated logic shutdown and lower thermal resistance (3 °C/W vs. ~4.5 °C/W), while MCP1703T-2502E/MB lacks both current capacity and control features required for direct substitution.

Availability

LD29300V25 is available at Aetrix Electronics and suitable for computer system core bias, battery-powered instrumentation, and TV/display power management requiring stable component supply and long-term industrial availability.

Supply support for LD29300V25 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 analog, microcontroller, power, and sensor solutions for industrial, automotive, and consumer markets.

LD29300V25 belongs to the LD29300 series of high-current, ultra-low-dropout linear regulators engineered for post-regulation in space-constrained, thermally demanding applications where precision, reliability, and integration are critical.

FAQ

What is the minimum input voltage required for LD29300V25 to regulate 2.5 V at 3 A?

The minimum operating input voltage is 2.5 V, but to maintain regulation at 3 A, input must exceed 2.9 V due to 0.4 V typical dropout. At 25°C and 3 A load, regulation holds down to VI = VO + VDROP = 2.5 V + 0.4 V = 2.9 V; derating applies at elevated temperature per Figure 3.

Does LD29300V25 require an external capacitor on the INH pin for stable shutdown operation?

No external capacitor is required on the INH pin. The device accepts clean TTL/CMOS logic signals directly; input leakage is only 5–10 µA, and switching thresholds are specified at 0.8 V (low) and 2 V (high) across –40°C to +125°C.

Can LD29300V25 be used with ceramic output capacitors, and what is the minimum recommended value?

Yes - LD29300V25 is stable with ceramic output capacitors. The datasheet specifies 10 µF minimum (CO = 10 µF), and Figure 11 confirms stability across 4.7–100 µF. X7R or X5R dielectrics are recommended for temperature stability.

How does thermal performance differ between D2PAK and TO-220 packages for LD29300V25?

D2PAK (used for LD29300V25) has R_thj-case = 3 °C/W, identical to TO-220, but superior R_thj-amb = 60 °C/W vs. TO-220's 50 °C/W due to optimized PCB copper area requirements. Effective thermal design requires ≥4 cm² of 2-oz copper connected to the exposed pad.