STMicroelectronics LD29150PT

Overview

LD29150PT from STMicroelectronics is a 1.5 A, fixed 5.0 V output, very low-dropout linear voltage regulator in PPAK package with typical 400 mV dropout at full load, ±1% output accuracy over temperature, and logic-controlled electronic shutdown. It delivers stable power for post-regulation in switching supplies and battery-powered systems where ultra-low dropout and ground current are critical.

For engineers reviewing the LD29150PT datasheet, LD29150PT pinout, LD29150PT application, or LD29150PT equivalent, key selection criteria include guaranteed 1.5 A output current, thermal shutdown at 150 °C, 200 µV_RMS output noise (10 Hz–100 kHz), and compatibility with 10 µF ceramic output capacitance.

Technical Context

The LD29150PT implements a high-accuracy bandgap reference and low-on-resistance PNP pass transistor to achieve 400 mV dropout at 1.5 A while maintaining ±1% output regulation across –40 °C to +125 °C junction temperature. Its internal current limiting and thermal shutdown protect against overload and fault conditions without external components.

It features an inhibit (INH) input enabling logic-level ON/OFF control with 0.8 V low threshold and 2 V high threshold, and supports stable operation with 10 µF ceramic output capacitors-eliminating need for electrolytic or tantalum types. Quiescent current remains as low as 130 µA in shutdown mode.

Key Specifications

Pinout & Package

LD29150PT uses the thermally enhanced PPAK (Power Package) surface-mount package with exposed thermal pad for low R_thJC = 8 °C/W. The 3-pin configuration supports compact layout and high-power dissipation in space-constrained designs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LD29150DT50R, the LD29150PT offers identical regulation performance but superior thermal management via PPAK's exposed pad; versus TLV1117-50, it delivers 50% higher current, 3× lower dropout, and integrated logic control-making it suitable for next-generation portable and industrial systems demanding reliability and efficiency.

Availability

LD29150PT is available at Aetrix Electronics and suitable for monitor power supplies, consumer video equipment, computer peripheral PSUs, and battery-powered instrumentation requiring stable component supply and long-term manufacturability.

Supply support for LD29150PT 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, MCU, 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 power-constrained systems where ultra-low dropout, precision output, and robust protection are mandatory-not just desirable.

FAQ

What is the minimum input voltage required for LD29150PT to regulate 5.0 V at 1.5 A?

The minimum input voltage is 5.4 V, calculated as VO + VDROP = 5.0 V + 0.4 V (typical dropout at 1.5 A). At worst-case 0.7 V dropout (max spec), 5.7 V input ensures regulation across temperature and process variation. Input below 5.0 V will cause dropout mode failure.

Can LD29150PT operate without an output capacitor?

No. A minimum 10 µF ceramic output capacitor is required for stability, as confirmed in Figure 18 (Stability vs. CO) and Section 3 (Typical Application). Omitting it causes oscillation and potential device failure. Tantalum or aluminum electrolytic caps are not recommended due to ESR sensitivity.

Does the INH pin require a pull-up resistor when unused?

Yes. When not actively driven, the INH pin must be tied to VIN through a 10–100 kΩ resistor to ensure default ON operation. Leaving it floating risks undefined state and intermittent shutdown due to noise coupling-ST specifies VIH ≥ 2 V for reliable enable.

Is LD29150PT compatible with lead-free reflow soldering profiles?

Yes. The PPAK package is RoHS-compliant and qualified for standard lead-free reflow (J-STD-020D), with peak temperature up to 260 °C. Thermal resistance data (R_thJC = 8 °C/W) assumes proper solder paste volume and thermal pad stencil design per ST's AN4427 application note.