STMicroelectronics LD29150PT15R

Overview

LD29150PT15R from STMicroelectronics is a 1.5 A, fixed-output (1.5 V) low-dropout linear voltage regulator in PPAK package with typical 400 mV dropout at full load, ±1% output accuracy at 25 °C, and logic-controlled electronic shutdown. It delivers stable power to noise-sensitive analog circuitry in battery-powered systems, post-regulation stages of switching supplies, and compact consumer electronics requiring minimal input–output differential.

For engineers reviewing the LD29150PT15R datasheet, LD29150PT15R pinout, LD29150PT15R application, or LD29150PT15R equivalent, key selection criteria include dropout voltage at 1.5 A, quiescent current under load, thermal shutdown threshold, output noise (72 µVRMS), and PPAK thermal resistance (8 °C/W junction-to-case).

Technical Context

The LD29150PT15R implements a high-accuracy bandgap reference and internal current-limiting circuitry, enabling stable regulation across –40 °C to +125 °C junction temperature. Its fixed 1.5 V output is trimmed at wafer level for ±1% initial accuracy, and line/load regulation remain within 0.06% and 0.2%, respectively.

It features an inhibit (INH) input that enables logic-level control of output state-low voltage (<0.8 V) forces shutdown with <180 µA quiescent current, while >2 V enables regulation. Thermal shutdown activates at 150 °C, and short-circuit current is limited to 2.2 A.

Key Specifications

Pinout & Package

LD29150PT15R uses the PPAK (Power Package) thermally enhanced surface-mount package (6.0 × 6.6 × 2.4 mm), featuring exposed thermal pad for low R_thJC = 8 °C/W. Pin 1 = IN, Pin 2 = GND, Pin 3 = OUT, Pin 4 = INH (inhibit control), Pin 5 = NC (not connected for fixed version), Pin 6 = GND (thermal pad connection).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar fixed-output LDO applications.

Compared with TPS7A4700RGWR and ADM7172ACPZ-R7, LD29150PT15R uniquely combines integrated inhibit control, 72 µVRMS noise, PPAK thermal efficiency, and production-proven reliability in automotive and industrial environments-without requiring external components or layout overhead.

Availability

LD29150PT15R is available at Aetrix Electronics and suitable for portable medical sensors, industrial PLC I/O modules, automotive infotainment cores, and edge AI accelerator boards requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for LD29150PT15R 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 microcontrollers, power management ICs, sensors, and analog devices for industrial, automotive, and consumer markets.

LD29150PT15R belongs to ST's high-current LDO family engineered for post-regulation in space-constrained, thermally demanding applications-where low dropout, precision output, and integrated protection reduce system-level design risk.

FAQ

What is the minimum input voltage required for LD29150PT15R to regulate 1.5 V output at 1.5 A?

The minimum input voltage is 1.9 V, calculated as output voltage (1.5 V) plus typical dropout (0.4 V). Absolute maximum ratings specify VI ≥ 2.5 V for guaranteed operation across temperature, and the device enters shutdown above 14 V input to protect internal circuitry.

Does LD29150PT15R require an external capacitor on the INH pin for noise immunity?

No external capacitor is specified or required on the INH pin. The input logic threshold is defined as VIL ≤ 0.8 V (OFF) and VIH ≥ 2 V (ON), with input leakage ≤10 µA. Layout best practice recommends routing INH close to MCU GPIO and avoiding long traces near noisy switching nodes.

Can LD29150PT15R be paralleled for higher current capability?

Paralleling is not recommended. The LD29150PT15R lacks built-in current-sharing features such as remote sensing or master-slave control. Mismatch in output voltage (±1%) and thermal gradients would cause uneven current distribution and potential overstress of one device.

What is the recommended PCB layout for thermal management of the PPAK package?

ST recommends soldering the exposed thermal pad (Pin 6) to a minimum 100 mm² copper area on the top layer, connected via ≥4 thermal vias (0.3 mm diameter) to an internal or bottom-layer solid ground plane. This achieves the rated R_thJA of 100 °C/W and prevents thermal derating below 1.5 A.