STMicroelectronics LD29150PTR

Overview

LD29150PTR from STMicroelectronics is an adjustable-output, 1.5 A low-dropout linear voltage regulator in PPAK package, featuring 400 mV typical dropout at full load, ±1% output voltage accuracy at 25 °C, and logic-controlled electronic shutdown. It delivers stable regulation for post-switching power supplies, battery-powered systems, and low-voltage embedded rails where minimal headroom and low ground current are critical.

For engineers reviewing the LD29150PTR datasheet, LD29150PTR pinout, LD29150PTR application, or LD29150PTR equivalent, key selection considerations include its adjustable output range (1.23 V to 20 V), thermal shutdown at 150 °C, 50 µV_RMS output noise (10 Hz–100 kHz), and compatibility with 10 µF ceramic output capacitors.

Technical Context

The LD29150PTR implements a high-accuracy bandgap reference (1.23 V ±1%) with external resistor divider feedback, enabling precise programmable output voltage. Its internal current limiting and thermal shutdown circuitry provide robust fault protection without external components.

It operates with input voltages from 2.5 V to 30 V and supports logic-level inhibit control (V_IL = 0.8 V, V_IH = 2 V) for system-level power sequencing. The regulator maintains stability with ≥10 µF ceramic output capacitance and exhibits 45–75 dB supply voltage rejection across 120 Hz–10 kHz.

Key Specifications

Pinout & Package

LD29150PTR uses the PPAK (Power Package) thermally enhanced surface-mount package, with exposed thermal pad for efficient PCB heat dissipation and R_thJC = 8 °C/W.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS7A8300RGRT and ADM7172ACPZ-R7, the LD29150PTR uniquely balances 1.5 A output, adjustable voltage, and industrial-grade thermal protection - making it optimal for cost-sensitive, medium-noise, high-current embedded power rails.

Availability

LD29150PTR is available at Aetrix Electronics and suitable for portable medical devices, industrial PLCs, battery-powered IoT gateways, and automotive body control modules requiring stable component supply and long-term production continuity.

Supply support for LD29150PTR 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.

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

FAQ

What is the minimum input voltage required for LD29150PTR to regulate at 3.3 V output?

The LD29150PTR requires a minimum input voltage of 3.7 V to maintain 3.3 V output at 1.5 A load, based on its 0.4 V typical dropout voltage. At lighter loads (e.g., 250 mA), input can be as low as 3.4 V. Input below 2.5 V disables regulation entirely, per absolute maximum ratings.

Can LD29150PTR be used without the INH pin connected?

Yes - the INH pin is optional. When left unconnected or pulled high (>2 V) via a pull-up resistor, the device operates normally. Leaving it floating is not recommended; tie to VIN or use a 100 kΩ pull-up to ensure reliable enable state during power-up.

What output capacitor value and type are required for stability?

ST specifies ≥10 µF ceramic (X5R/X7R) at the output for guaranteed stability. Tantalum or aluminum electrolytic capacitors are not recommended due to ESR sensitivity. A 10 µF/16 V X5R MLCC placed within 5 mm of the OUT and GND pins meets all transient and phase-margin requirements per Figure 18.

How does thermal performance differ between PPAK and DPAK packages for LD29150PTR?

Both PPAK and DPAK share identical R_thJC = 8 °C/W and R_thJA = 100 °C/W values per datasheet Table 3. However, PPAK's smaller footprint and optimized thermal pad layout allow superior PCB-level heat spreading in dense layouts, while DPAK offers easier manual soldering and rework.