STMicroelectronics LD29300V80

Overview

LD29300V80 from STMicroelectronics is a fixed-output, 8.0 V, 3 A low-dropout linear voltage regulator with ±1% output voltage tolerance at 25°C, 0.4 V typical dropout at 3 A, and logic-controlled electronic shutdown. It features internal current and thermal limiting, 45–100 mA quiescent current across load range, and is designed for post-regulation in switching power supplies and high-current battery-powered systems.

For engineers reviewing the LD29300V80 datasheet, LD29300V80 pinout, LD29300V80 application, or LD29300V80 equivalent, key selection criteria include guaranteed 3 A output under 0.4 V dropout, shutdown control interface compatibility (V_IL = 0.8 V, V_IH = 2 V), thermal resistance (R_thj-case = 3 °C/W), and 320 µV_RMS output noise in 10 Hz–100 kHz bandwidth.

Technical Context

The LD29300V80 implements a PNP-based LDO architecture with integrated bandgap reference, error amplifier, and current-limiting circuitry. Its dropout behavior is characterized down to 0.1 V at 500 mA and remains stable up to 0.7 V at 3 A across –40°C to +125°C junction temperature.

It includes an inhibit input (INH) enabling logic-level ON/OFF control with 5–10 µA input current, and integrates thermal shutdown that activates above +125°C junction temperature. The device maintains 45–59 dB supply voltage rejection at 120 Hz under 1.5 A load.

Key Specifications

Pinout & Package

LD29300V80 is packaged in TO-220 (vertical mount, 3-pin) with exposed tab for thermal conduction. Pin 1 = Input (VI), Pin 2 = Ground (GND), Pin 3 = Output (VO); INH function is not present on fixed-voltage versions - confirmed by schematic note "* Not connected for fixed version" and absence of INH pin in TO-220 connection diagram.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LT1963AEST-8.0#TRPBF and TPS7A8300RGRT, the LD29300V80 offers native 8 V fixed output with logic shutdown in TO-220, making it optimal for cost-sensitive, high-reliability industrial systems where pin count, thermal performance, and ease of integration are prioritized over ultra-low IQ or adjustable voltage.

Availability

LD29300V80 is available at Aetrix Electronics and suitable for industrial motor drives, battery-powered test equipment, and medical imaging subsystems requiring stable component supply with long lifecycle visibility and traceable sourcing.

Supply support for LD29300V80 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, power, microcontroller, and sensor solutions for industrial, automotive, and consumer markets.

The LD29300 series belongs to ST's high-current LDO portfolio, engineered specifically for post-regulation in switched-mode power supplies and high-reliability embedded systems demanding sub-0.5 V dropout and robust thermal performance.

FAQ

What is the minimum input voltage required for LD29300V80 to deliver full 3 A output?

The minimum input voltage is 8.4 V - calculated as 8.0 V output plus 0.4 V typical dropout - verified across –40°C to +125°C junction temperature per electrical characteristics table. At 3 A load and 125°C, maximum dropout rises to 0.7 V, requiring ≥8.7 V input for guaranteed regulation.

Does LD29300V80 include an enable/shutdown pin?

No - LD29300V80 is the fixed-output variant without inhibit functionality. The INH pin is only present on adjustable (LD29300ADJ) and select voltage variants marked with "M" or "T" suffixes (e.g., LD29300D2M80). TO-220 pinout confirms only Input, Ground, and Output terminals.

What output capacitor value and type are required for stability?

A minimum 10 µF low-ESR aluminum or ceramic capacitor is required at the output, as specified in the application circuit on page 3. Ceramic X7R/X5R types are validated; ESR should be ≤100 mΩ. Larger values (e.g., 22–47 µF) improve transient response but are not mandatory for basic stability.

How does thermal performance compare between TO-220 and D2PAK packages for LD29300V80?

Both TO-220 and D2PAK share identical R_thj-case = 3 °C/W, but D2PAK offers lower R_thj-amb = 60 °C/W vs. TO-220's 50 °C/W due to larger copper area. In free-air conditions, TO-220 achieves higher power dissipation before thermal shutdown; D2PAK excels when mounted on PCB copper planes.