STMicroelectronics LD29300D2M25R

Overview

LD29300D2M25R from STMicroelectronics is a 2.5 V fixed-output, 3 A low-dropout linear voltage regulator in D2PAK package with ±1 % output voltage tolerance at 25 °C, 0.4 V typical dropout at 3 A, and logic-controlled electronic shutdown. It delivers high-accuracy post-regulation for CPU core supplies in embedded computing systems requiring stable low-noise DC power under high-current transient loads.

For engineers reviewing the LD29300D2M25R datasheet, LD29300D2M25R pinout, LD29300D2M25R application, or LD29300D2M25R equivalent, key selection criteria include guaranteed 3 A output current, thermal/current limiting, ground current behavior across load range, and compatibility with 10 µF ceramic output capacitance for stability.

Technical Context

This regulator uses a PNP pass transistor architecture enabling ultra-low dropout (0.4 V typ. at 3 A) and low quiescent current (20–100 mA across 1.5–3 A load). Internal protection includes thermal shutdown and current limiting, with an inhibit pin supporting logic-level ON/OFF control (VIL ≤ 0.8 V, VIH ≥ 2 V).

It operates over –40 to +125 °C junction temperature, supports input voltages up to 30 V (with automatic shutdown above 14 V), and maintains 2.5 V output within ±1.0 % line/load regulation across full temperature and current range.

Key Specifications

Pinout & Package

D2PAK (TO-263) package: thermally enhanced surface-mount outline with exposed metal tab for PCB heat sinking; JEDEC MO-211AC compliant; RoHS-compliant ECOPACK® with lead-free terminations.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LD29300D2M25R, the TPS7A8300 offers lower noise and quiescent current but lacks integrated shutdown logic; the ADM7172 provides best-in-class noise and dropout at reduced current capacity and no enable function-making the LD29300D2M25R optimal for cost-sensitive, high-current, logic-controlled applications demanding robust thermal protection.

Availability

LD29300D2M25R is available at Aetrix Electronics and suitable for industrial HMIs, medical signal chains, FPGA power delivery, and battery-powered test equipment requiring stable component supply with full traceability and long-term lifecycle support.

Supply support for LD29300D2M25R 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 products for automotive, industrial, and consumer markets since 1987.

The LD29300 series belongs to ST's high-current LDO portfolio, engineered specifically for post-regulation in power-constrained systems where low dropout, thermal resilience, and logic-controlled enablement are critical.

FAQ

What is the minimum input voltage required for LD29300D2M25R to regulate 2.5 V output?

The minimum operating input voltage is 2.5 V, but stable regulation requires VI ≥ VO + VDROP. At 3 A load, VDROP is 0.4 V typical, so ≥2.9 V input is needed. The device enters shutdown if VI exceeds 14 V, protecting downstream circuitry.

Can LD29300D2M25R be used with ceramic output capacitors?

Yes-ST specifies 10 µF ceramic (X5R/X7R) as the minimum stable output capacitance. The regulator is internally compensated for this value; larger ceramics improve transient response without risk of oscillation, as confirmed in Figure 15 (Stability vs CO).

How does the INH pin behave during power-up and brown-out conditions?

The INH pin is referenced to GND and has no internal pull-up/down. During power-up, it must be actively driven ≥2 V to enable output; floating or <0.8 V forces shutdown. Under brown-out, if VI drops below 2.5 V, the regulator ceases regulation regardless of INH state.

What thermal derating applies when using LD29300D2M25R on a standard 4-layer PCB?

With 2 oz copper, 200 mm² thermal pad, and 1 cm² copper pour under the D2PAK tab, R_thJA ≈ 40 °C/W (vs. 60 °C/W typical for bare D2PAK). At 3 A and 0.4 V dropout (1.2 W dissipation), junction rise is ~48 °C-well within the 125 °C max TJ limit at 77 °C ambient.