STMicroelectronics LD29150DT50

Overview

LD29150DT50 from STMicroelectronics is a fixed-output 5.0 V, 1.5 A low-dropout linear regulator in DPAK package, featuring 400 mV typical dropout at full load, ±1% output voltage accuracy over temperature, and logic-controlled electronic shutdown. It delivers stable post-regulation for switching power supplies and powers sensitive analog/digital circuitry in battery-powered systems where ultra-low dropout and ground current are critical.

For engineers reviewing the LD29150DT50 datasheet, LD29150DT50 pinout, LD29150DT50 application, or LD29150DT50 equivalent, this page provides verified technical context, real-world design meaning of key specs, validated pin functions, application-specific implementation guidance, and confirmed alternative options with functional distinctions.

Technical Context

The LD29150DT50 integrates internal current limiting and thermal shutdown (150 °C), operates with input voltages up to 30 V (auto-shutdown above 14 V), and maintains regulation down to VI = VO + 0.4 V at 1.5 A. Its adjustable inhibit input (VINH) accepts 0.8 V logic-low and 2.0 V logic-high for precise system-level power sequencing.

Designed for high-current, low-noise applications, it achieves 49–64 dB supply voltage rejection at 120 Hz and delivers 200 µVRMS output noise (10 Hz–100 kHz) at 100 mA load - enabling clean biasing for ADCs, sensors, and RF front-ends without external filtering overhead.

Key Specifications

Pinout & Package

DPAK (TO-252-3) package with exposed thermal pad on underside for PCB copper pour attachment; standard JEDEC outline, 2.4 mm height, 6.2 mm × 6.6 mm footprint.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 5 V, 1.5 A LDO applications.

Compared with TLV1117-50CDR and MCP1703T-5002E/MB, the LD29150DT50 uniquely combines 1.5 A capability, 0.4 V dropout, integrated shutdown, and thermal protection in a thermally robust DPAK - making it the only option among the three viable for high-current, battery-sensitive, and safety-critical embedded systems.

Availability

LD29150DT50 is available at Aetrix Electronics and suitable for industrial automation controllers, portable test instruments, automotive accessory modules, and battery-powered medical devices requiring stable component supply across extended temperature ranges and multi-year production cycles.

Supply support for LD29150DT50 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 power-constrained systems where ultra-low dropout, precision output, and integrated protection are mandatory - targeting medical, test & measurement, and industrial edge nodes.

FAQ

What is the minimum input voltage required for the LD29150DT50 to regulate 5.0 V at 1.5 A?

The LD29150DT50 requires a minimum input voltage of VO + VDROP = 5.0 V + 0.4 V = 5.4 V under worst-case conditions (1.5 A, -40 to +125 °C). At room temperature and lighter loads, regulation begins as low as 5.1 V due to lower dropout, but 5.4 V must be maintained for full-spec operation across temperature and current extremes.

Can the LD29150DT50 be used without the INH pin connected?

Yes - the INH pin is optional. When left unconnected or tied to VIN, the device operates continuously. To ensure reliable startup, ST recommends pulling INH to VIN via a 10 kΩ resistor if not actively controlled; floating INH may cause erratic enable behavior due to noise susceptibility.

What output capacitor value and type are required for stability?

A minimum 10 µF ceramic capacitor (X5R/X7R, 10 V rating) is required at the OUT pin, placed within 5 mm of the device. The datasheet confirms stability with 10 µF CO (Figure 18); using smaller values risks oscillation, while tantalum or aluminum electrolytics are not recommended due to higher ESR and aging effects.

Does the LD29150DT50 support reverse-voltage protection?

No - the LD29150DT50 lacks internal reverse-voltage protection. If input polarity reversal is possible in the application, an external series Schottky diode (e.g., 1N5819) must be added between VIN and IN pin, accepting the associated forward drop and power loss.