STMicroelectronics LD29300P2M33

Overview

LD29300P2M33 from STMicroelectronics is a 3.3 V, 3 A fixed-output low-dropout linear voltage regulator in P2PAK package with ±1% output voltage tolerance at 25°C, 0.4 V typical dropout at 3 A, and logic-controlled electronic shutdown. It delivers stable power for post-regulation in switching supplies and battery-powered systems requiring high accuracy and ultra-low dropout.

For engineers reviewing the LD29300P2M33 datasheet, LD29300P2M33 pinout, LD29300P2M33 application, or LD29300P2M33 equivalent, key selection criteria include guaranteed 3 A output current, thermal/current protection, shutdown control interface, and 132 µV_RMS output noise at 100 mA - critical for noise-sensitive analog and digital loads.

Technical Context

This LDO operates across -40°C to +125°C junction temperature with internal current limiting and thermal shutdown. Its fixed 3.3 V output is trimmed to ±1% at 25°C and maintains ±1.02% total tolerance over full load (10 mA–3 A) and temperature range.

The device features a dedicated INH (inhibit) input enabling logic-controlled shutdown with 0.8 V/2.0 V logic thresholds, 5–10 µA input current, and <180 µA quiescent current in shutdown mode - supporting low-power system sequencing and standby states.

Key Specifications

Pinout & Package

P2PAK package: thermally enhanced surface-mount power package with exposed drain pad for efficient heat dissipation; R_thj-case = 3°C/W, R_thj-amb = 60°C/W.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 3.3 V, 3 A LDO applications.

Compared with LD29300P2M33, LD29300D2M33 offers identical performance in a different thermally equivalent package, while LD29300P2T33 provides identical functionality in tape-and-reel format - both preserve the 0.4 V dropout, ±1% accuracy, and INH-controlled shutdown essential for system-level power integrity.

Availability

LD29300P2M33 is available at Aetrix Electronics and suitable for power supply post-regulation, computer system core rails, and battery-powered instrumentation requiring stable component supply with guaranteed 3 A output and ±1% voltage accuracy.

Supply support for LD29300P2M33 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 designing and manufacturing analog, microcontroller, power, and sensor solutions for industrial, automotive, and consumer markets.

The LD29300 series belongs to ST's high-current LDO portfolio, engineered specifically for applications demanding ultra-low dropout, tight output tolerance, and integrated protection - targeting post-regulation, battery-powered, and noise-critical systems.

FAQ

What is the minimum input voltage required for LD29300P2M33 to regulate 3.3 V at full 3 A load?

The minimum operating input voltage is 2.5 V, but to maintain regulation at 3 A, input must exceed 3.3 V + dropout. With 0.4 V typical dropout at 3 A, a minimum of 3.7 V is required. At higher temperatures or worst-case 0.7 V dropout, 4.0 V input ensures margin.

Does LD29300P2M33 require an external capacitor on the INH pin for stable shutdown control?

No external capacitor is required on the INH pin. The device specifies logic-level thresholds (0.8 V low, 2.0 V high) and draws only 5–10 µA input current. A simple pull-up resistor to 3.3 V or direct MCU GPIO drive suffices for reliable enable/disable control.

Can LD29300P2M33 be used without an output capacitor?

No. The datasheet mandates ≥10 µF ceramic output capacitance (with ESR ≤ 100 mΩ) for stability. Omitting it risks oscillation and output voltage instability, especially under load transients. CO = 10 µF is validated for all operating conditions.

How does thermal resistance differ between P2PAK and D2PAK packages for LD29300 devices?

Both P2PAK and D2PAK packages have identical R_thj-amb = 60°C/W and R_thj-case = 3°C/W per the datasheet. The difference lies solely in mechanical footprint and leadframe geometry - not thermal performance - making them functionally interchangeable for thermal design purposes.