STMicroelectronics LD29300P2M50

Overview

LD29300P2M50 from STMicroelectronics is a 5.0 V fixed-output, 3 A low-dropout linear voltage regulator in P2PAK package with ±1% output tolerance at 25°C, 0.4 V typical dropout at 3 A, and logic-controlled electronic shutdown. It delivers stable power for high-current post-regulation in computer systems and battery-powered equipment where ultra-low dropout and ground current are critical.

For engineers reviewing the LD29300P2M50 datasheet, LD29300P2M50 pinout, LD29300P2M50 application, or LD29300P2M50 equivalent, key selection criteria include guaranteed 3 A output current, thermal/current protection, 20–100 mA quiescent current across load range, and compatibility with 10 µF output capacitance for stability.

Technical Context

The LD29300P2M50 integrates internal current limiting and thermal shutdown to prevent damage under overload or overtemperature conditions. Its inhibit function enables logic-controlled ON/OFF operation via a dedicated INH pin with TTL-compatible thresholds (VIL ≤ 0.8 V, VIH ≥ 2 V).

Designed for high-current, low-noise applications, it achieves 49–64 dB supply voltage rejection at 120 Hz and maintains output regulation within ±1% over –40°C to +125°C junction temperature, with load regulation of ≤1.0% from 10 mA to 3 A.

Key Specifications

Pinout & Package

P2PAK package: thermally enhanced surface-mount variant with exposed drain pad for efficient heat transfer; compatible with standard reflow profiles and industrial PCB assembly.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 5 V, 3 A LDO regulator applications.

Compared with LT1963AEST-5.0#TRPBF and TLS850B2LXVSA1, the LD29300P2M50 uniquely combines 3 A continuous output, 0.4 V dropout, and ±1% accuracy in a thermally robust P2PAK package-making it the sole option among the three capable of unassisted 5 V/3 A regulation in industrial and computing environments.

Availability

LD29300P2M50 is available at Aetrix Electronics and suitable for computer systems, industrial control units, and battery-powered test equipment requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.

Supply support for LD29300P2M50 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 LD29300 series belongs to ST's high-current LDO portfolio, engineered specifically for post-regulation in power-constrained systems where minimal dropout, tight output tolerance, and robust thermal behavior are mandatory.

FAQ

What is the minimum input voltage required for LD29300P2M50 to regulate 5.0 V at 3 A?

The minimum input voltage is VO + VDROP = 5.0 V + 0.4 V = 5.4 V under typical conditions. Absolute minimum specified is 2.5 V, but regulation fails below VO + VDROP. At 3 A and –40°C to +125°C, VDROP reaches 0.7 V max, so 5.7 V input is recommended for guaranteed regulation across temperature.

Does LD29300P2M50 require an external capacitor on the INH pin?

No external capacitor is required on the INH pin. It is a CMOS-compatible digital input with 5–10 µA leakage current and TTL-level thresholds (VIL ≤ 0.8 V, VIH ≥ 2 V). A simple pull-up resistor to VI or direct MCU GPIO connection suffices for reliable enable/disable control.

Can LD29300P2M50 be used without the INH function connected?

Yes. Leaving INH open or tying it to VI (input voltage) forces the device into permanent ON mode. The regulator operates normally with full 3 A capability and standard quiescent current. No pull-down is needed unless active shutdown is required.

What is the maximum allowable power dissipation for LD29300P2M50 in P2PAK package?

Maximum power dissipation depends on thermal environment. With Rthj-case = 3 °C/W and max junction temperature of 125°C, at 25°C ambient and ideal heatsinking, PDmax ≈ (125 – 25)/3 = 33.3 W. In practice, with Rthj-amb = 60 °C/W, PDmax ≈ (125 – 25)/60 = 1.67 W without heatsink-so external thermal management is essential above ~1 A at high VI–VO differentials.