STMicroelectronics LD29300D2T80

Overview

LD29300D2T80 from STMicroelectronics is a fixed-output, 8.0 V, 3 A low-dropout linear voltage regulator in D2PAK package with ±1% output tolerance at 25°C, 0.4 V typical dropout at 3 A, and logic-controlled electronic shutdown. It delivers stable power for high-current post-regulation in computer systems and battery-powered equipment where minimal input–output differential is critical.

For engineers reviewing the LD29300D2T80 datasheet, LD29300D2T80 pinout, LD29300D2T80 application, or LD29300D2T80 equivalent, key selection criteria include guaranteed 3 A output current, thermal/current protection, 8.0 V fixed output with tight tolerance, and compatibility with 10 µF output capacitance for stability.

Technical Context

The LD29300D2T80 integrates internal current limiting and thermal shutdown to prevent damage under overload or overtemperature conditions. Its logic-controlled inhibit function enables precise ON/OFF control via TTL-compatible input (VIL ≤ 0.8 V, VIH ≥ 2 V), supporting system-level power sequencing.

Designed for high-current loads up to 3 A, it maintains regulation with input voltages as low as 9.0 V (VI ≥ VO + VDROP) across –40°C to 125°C junction temperature. Dropout voltage remains ≤ 0.7 V at full load and elevated temperature, enabling efficient operation in battery- and adapter-fed systems.

Key Specifications

Pinout & Package

D2PAK (TO-263) thermally enhanced surface-mount package with exposed thermal pad; requires PCB copper pour for effective heat transfer per STMicroelectronics mechanical data P011P6G.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 8 V, 3 A LDO applications.

Compared with LT1963AEST-8.0#TRPBF and TCP102E-8.0VCT, the LD29300D2T80 uniquely combines 3 A capability, 0.4 V dropout, and TTL-compatible inhibit in a single D2PAK package-enabling compact, high-current, sequenced power delivery without external MOSFETs or controllers.

Availability

LD29300D2T80 is available at Aetrix Electronics and suitable for computer systems, industrial motor drives, battery-powered test equipment, and medical imaging subsystems requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for LD29300D2T80 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, specializing in power management, microcontrollers, and analog ICs for industrial, automotive, and consumer markets.

The LD29300 series belongs to ST's high-current LDO portfolio, engineered for post-regulation in space-constrained, thermally demanding applications where low dropout and integrated protection are mandatory.

FAQ

What is the minimum input voltage required for LD29300D2T80 to regulate 8.0 V at 3 A?

The minimum input voltage is VO + VDROP = 8.0 V + 0.4 V = 8.4 V typical, but ST specifies 9.0 V minimum per electrical characteristics (VI ≥ 9 V for VO = 8.0 V at IO = 3 A, TJ = –40°C to 125°C). At elevated temperature or worst-case dropout (0.7 V), 8.7 V is required; 9.0 V ensures margin across all conditions.

Can LD29300D2T80 operate without the INH pin connected?

Yes-the INH pin is internally pulled up; leaving it open defaults the device to ON mode. However, ST recommends tying INH to VIN through a 10 kΩ resistor for robust noise immunity in electrically noisy environments, as floating inputs may cause erratic shutdown behavior.

Is an input capacitor required, and what value is recommended?

Yes-an input capacitor is mandatory for stability and transient response. ST specifies a minimum 330 nF ceramic capacitor placed as close as possible to the IN and GND pins. For systems with long input traces or high-impedance sources, a 1–10 µF bulk capacitor in parallel improves low-frequency ripple rejection.

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

D2PAK has R_thj-case = 3 °C/W versus TO-220's 3 °C/W-identical junction-to-case resistance-but D2PAK's surface-mount construction enables larger PCB copper areas for heatsinking, yielding lower effective R_thj-amb (60 °C/W vs TO-220's 50 °C/W). Thus, D2PAK achieves better thermal performance in reflow-soldered, board-level thermal designs.