STMicroelectronics LD29150DT25

Overview

LD29150DT25 from STMicroelectronics is a fixed-output 2.5 V, 1.5 A low-dropout linear regulator in PPAK package with 400 mV typical dropout at full load, ±1% output voltage accuracy over temperature, and logic-controlled electronic shutdown. It delivers stable post-regulation for high-current digital power rails in monitors, TVs, and embedded systems where ultra-low dropout and ground current are critical.

For engineers reviewing the LD29150DT25 datasheet, LD29150DT25 pinout, LD29150DT25 application, or LD29150DT25 equivalent, this page provides verified electrical specifications, thermal behavior, real-world use cases, and validated alternative options for industrial and consumer power supply design.

Technical Context

The LD29150DT25 integrates internal current limiting and thermal shutdown (150 °C), operates with input voltages up to 30 V (with automatic shutdown above 14 V), and supports logic-controlled inhibit functionality via a dedicated INH pin. Its reference voltage is trimmed to ±1% at 25 °C and maintains ±2% over –40 to +125 °C junction range.

Designed for high-accuracy, high-current LDO operation, it achieves 100 µVRMS output noise (10 Hz–100 kHz) at 100 mA load and delivers 70 dB supply voltage rejection at 120 Hz under 0.75 A load. Quiescent current remains below 80 mA at 1.5 A output and drops to 180 µA in shutdown mode.

Key Specifications

Pinout & Package

LD29150DT25 uses the PPAK (Power Package) thermally enhanced surface-mount package with exposed thermal pad, offering 8 °C/W junction-to-case thermal resistance. Pin configuration is identical across DPAK and PPAK variants per Figure 3 of ST DocID9614 Rev 20.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LD29150DT25, the TR variant offers identical performance in optimized packaging for SMT lines, while TSM1052-2.5 trades shutdown capability and 1.5 A capacity for cost reduction in less demanding applications.

Availability

LD29150DT25 is available at Aetrix Electronics and suitable for monitor power supplies, embedded system core rails, TV audio subsystems, and battery-powered data loggers requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for LD29150DT25 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.

The LD29150 series belongs to ST's high-current LDO portfolio, engineered specifically for post-regulation in space-constrained, thermally demanding applications where ultra-low dropout, precision output, and integrated protection are mandatory.

FAQ

What is the minimum input voltage required for LD29150DT25 to regulate 2.5 V at 1.5 A?

The minimum input voltage is 2.9 V, calculated as VO + VDROP = 2.5 V + 0.4 V (typical dropout at 1.5 A). The datasheet specifies VI ≥ 3.5 V for guaranteed operation across temperature and load, but functional regulation begins at 2.9 V under nominal conditions.

Does LD29150DT25 require an external capacitor on the INH pin?

No external capacitor is required on the INH pin. It is a CMOS-compatible digital input with 5–10 µA leakage current; a simple pull-up or microcontroller GPIO suffices. Capacitive filtering is unnecessary unless EMI immunity is required in noisy environments.

Can LD29150DT25 be used without the INH pin connected?

Yes. Leaving INH open or tying it to VIN (≥2 V) enables normal operation. The device defaults to ON mode if INH is unconnected, as confirmed by ST's application note AN4192 and electrical characteristics tables specifying VIH = 2 V.

What is the recommended output capacitor for stability with LD29150DT25?

ST specifies a minimum 10 µF ceramic capacitor (X5R/X7R, ≤100 mΩ ESR) at the output. Figure 18 shows stable operation with CO ≥ 10 µF; using <10 µF risks oscillation, especially under transient load conditions.