STMicroelectronics LD29150V25

Overview

LD29150V25 from STMicroelectronics is a 2.5 V fixed-output, 1.5 A low-dropout linear voltage regulator in PPAK package. It delivers ±1% output accuracy at 25 °C, features 0.4 V typical dropout at full load (1.5 A), and includes logic-controlled electronic shutdown, internal current limiting, and thermal shutdown at 150 °C. It is designed for post-regulation in switching power supplies and low-voltage, high-current systems such as monitor and TV series power supplies.

For engineers reviewing the LD29150V25 datasheet, LD29150V25 pinout, LD29150V25 application, or LD29150V25 equivalent, key selection criteria include dropout voltage at 1.5 A, quiescent current under load, output noise (100 µVRMS), supply voltage rejection (55–70 dB), and thermal resistance (8 °C/W junction-to-case).

Technical Context

The LD29150V25 operates as a single-output, fixed-voltage LDO with integrated inhibit (shutdown) control via a logic-compatible input pin. Its architecture uses a PNP pass transistor to achieve ultra-low dropout and stable regulation across –40 to 125 °C junction temperature.

It supports input voltages from 3.5 V to 13 V, maintains 2.5 V output within ±1% over line, load, and temperature, and delivers 1.5 A while limiting short-circuit current to 2.2 A. Thermal shutdown activates at 150 °C, and junction-to-ambient thermal resistance is 100 °C/W in PPAK.

Key Specifications

Pinout & Package

LD29150V25 is housed in a thermally enhanced PPAK (Power Package) surface-mount package with exposed thermal pad, optimized for high-power dissipation in compact layouts. The package measures 6.0–6.2 mm × 6.4–6.6 mm × 9.35–10.1 mm and features 3 terminals.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LD29150DT25R, the LD29150V25 offers superior thermal performance in space-constrained designs due to PPAK's lower junction-to-case resistance (8 °C/W). Versus TSM1052-2.5, it adds programmable shutdown and supports 25% higher current with lower noise and tighter accuracy-critical for instrumentation and video systems.

Availability

LD29150V25 is available at Aetrix Electronics and suitable for monitor power supplies, TV series regulators, battery-powered instrumentation, and computer system rails requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for LD29150V25 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 LD29150 series belongs to ST's high-current LDO portfolio, engineered specifically for post-regulation in switching power supplies and low-dropout-critical systems where minimal voltage headroom and high accuracy are mandatory.

FAQ

What is the minimum input voltage required for LD29150V25 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). Operation below this causes dropout-output voltage drops linearly with input. The absolute minimum VI per datasheet is 3.5 V for guaranteed 2.5 V regulation across temperature and load, due to line regulation and margin requirements.

Does LD29150V25 require an external capacitor on the INH pin for stable shutdown control?

No external capacitor is required on the INH pin. It is a CMOS-compatible digital input with 5–10 µA leakage current and TTL/CMOS logic thresholds (VIL ≤ 0.8 V, VIH ≥ 2 V). A simple pull-up resistor to VI or direct MCU GPIO drive suffices; no filtering or decoupling is specified in the datasheet.

Can LD29150V25 be used in parallel to increase output current beyond 1.5 A?

No-parallel operation is not supported. The device lacks current-sharing features such as current-sense outputs or master-slave synchronization. Attempting parallel connection risks thermal runaway due to mismatched dropout voltages and unbalanced load distribution, violating absolute maximum ratings.

What is the recommended output capacitor value and type for LD29150V25 stability?

The datasheet specifies a minimum 10 µF ceramic capacitor (X5R or X7R) at the output. This value ensures phase margin >45° and stable transient response. Larger values (e.g., 22 µF) improve load-step immunity but do not degrade stability. Aluminum electrolytic or tantalum capacitors are not recommended due to ESR and aging effects that may compromise regulation.