STMicroelectronics LD29150PT80R

Overview

LD29150PT80R from STMicroelectronics is a 1.5 A, fixed-output (8.0 V) low-dropout linear voltage regulator in PPAK package, featuring 400 mV typical dropout at full load, ±1% output voltage accuracy over temperature, and logic-controlled electronic shutdown. It delivers stable power for post-regulation in switching supplies and battery-powered systems requiring minimal input–output differential.

For engineers reviewing the LD29150PT80R datasheet, LD29150PT80R pinout, LD29150PT80R application, or LD29150PT80R equivalent, key selection criteria include dropout voltage at 1.5 A, thermal shutdown threshold, quiescent current in shutdown mode, and PPAK thermal resistance for high-current PCB layouts.

Technical Context

The LD29150PT80R integrates internal current limiting and thermal shutdown at 150 °C, with an inhibit (INH) pin enabling logic-level ON/OFF control. Its reference voltage is trimmed to ±1% at 25 °C and maintains stability across –40 to +125 °C junction range.

Designed for high-current, low-headroom applications, it achieves 72 dB supply voltage rejection at 120 Hz and 200 µV_RMS output noise (10 Hz–100 kHz) at 100 mA load - critical for noise-sensitive analog rails and microcontroller core supplies.

Key Specifications

Pinout & Package

LD29150PT80R uses the PPAK (Power Package) thermally enhanced surface-mount package (6.0 × 6.6 × 2.4 mm), optimized for high-current PCB thermal management with low R_thJC = 8 °C/W.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS7A4700RGWR and ADM7172ACPZ-8-R7, LD29150PT80R uniquely balances 1.5 A capability, 0.4 V dropout, PPAK thermal efficiency, and fixed 8 V output - making it optimal for cost- and space-sensitive industrial and automotive modules needing robust, integrated regulation.

Availability

LD29150PT80R is available at Aetrix Electronics and suitable for industrial PLC I/O modules, automotive infotainment systems, medical portable monitors, and networking edge router PoE interfaces requiring stable component supply with guaranteed long-term manufacturability.

Supply support for LD29150PT80R 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 components for industrial, automotive, and consumer markets.

LD29150PT80R belongs to ST's high-current LDO regulator product line, engineered specifically for post-regulation in power-constrained systems where ultra-low dropout, thermal resilience, and integrated protection are mandatory.

FAQ

What is the minimum input voltage required for LD29150PT80R to maintain regulation at 1.5 A?

The minimum input voltage is 8.4 V - calculated as 8.0 V output plus 0.4 V typical dropout at 1.5 A. Below this, output voltage drops proportionally. Absolute maximum input is 30 V, but automatic shutdown activates above 14 V to protect internal circuitry.

Does LD29150PT80R require an external capacitor on the INH pin for stable operation?

No external capacitor is required on the INH pin. It is a CMOS-compatible digital input with 5–10 µA leakage current; pull-up or pull-down resistors (typically 10–100 kΩ) suffice for noise immunity. The pin responds within microseconds, enabling fast enable/disable sequencing.

Can LD29150PT80R be used without the recommended 10 µF output capacitor?

No - the 10 µF minimum ceramic output capacitor is mandatory for stability per ST's design validation. Omitting it risks oscillation, especially under dynamic load steps. ST specifies CO ≥10 µF with ESR ≤100 mΩ; X5R/X7R dielectrics are recommended.

How does the thermal performance of the PPAK package compare to DPAK for LD29150PT80R?

Both packages share identical R_thJC = 8 °C/W, but PPAK offers superior R_thJA in PCB-optimized layouts due to its exposed thermal pad and shorter thermal path. In standard 2-layer boards with 200 mm² copper, PPAK achieves ~100 °C/W vs. DPAK's ~115 °C/W - enabling ~15% higher continuous current at same ambient temperature.