STMicroelectronics LD29300P2M

Overview

LD29300P2M from STMicroelectronics is a 3A, fixed-output low-dropout linear voltage regulator in P2PAK package, delivering 5.0 V ±1% at 25°C with typical dropout of 0.4 V at 3A and internal thermal/current limiting. It features logic-controlled electronic shutdown (inhibit function), 20–100 mA quiescent current across load range, and supports post-regulation in switching power supplies and battery-powered systems.

For engineers reviewing the LD29300P2M datasheet, LD29300P2M pinout, LD29300P2M application, or LD29300P2M equivalent, key selection criteria include guaranteed 3A output under 0.4 V dropout, ±1% output tolerance over –40°C to +125°C, shutdown control interface compatibility, thermal resistance (R_thj-case = 3°C/W), and noise performance (200 µV_RMS, 10 Hz–100 kHz).

Technical Context

The LD29300P2M implements a high-accuracy bandgap reference and error amplifier driving a PNP pass transistor, enabling stable regulation with minimal headroom. Its inhibit input (INH) accepts TTL/CMOS-compatible logic levels (V_IL ≤ 0.8 V, V_IH ≥ 2 V) to enable/disable regulation without external circuitry.

Thermal protection activates when junction temperature exceeds safe limits, and current limiting engages at ~4.5 A short-circuit current. The device operates with input voltages from 6 V to 13 V for 5.0 V output, maintaining line regulation within 0.06–0.5% and load regulation within 0.2–1.0% across full temperature and load range.

Key Specifications

Pinout & Package

P2PAK package (7.2 mm × 6.2 mm × 1.7 mm body, 3-pin TO-263 variant) with exposed thermal pad for enhanced heat transfer. Pin 1 = Input (VI), Pin 2 = Ground (GND), Pin 3 = Output (VO); INH terminal is internally connected and not brought out on fixed-voltage versions - confirmed per schematic diagram and order code LD29300P2M50 (fixed 5.0 V, no adjust/inhibit pins).

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 TSP50C50, the LD29300P2M offers the best balance of ultra-low dropout (0.4 V), tight tolerance (±1%), integrated shutdown, and thermal performance (3°C/W) in a single P2PAK package - making it optimal for space-constrained, thermally demanding 5 V systems requiring precise sequencing and robust protection.

Availability

LD29300P2M is available at Aetrix Electronics and suitable for computer power distribution, industrial PLC I/O modules, and battery-powered test equipment requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for LD29300P2M 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, power, microcontroller, 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 switching power supplies and low-dropout-critical battery systems where ground current and thermal efficiency are design priorities.

FAQ

What is the minimum input voltage required for LD29300P2M to regulate 5.0 V at 3 A?

The minimum operating input voltage is 6.0 V - derived from VO (5.0 V) plus maximum dropout (0.7 V) per electrical characteristics table. At 3 A and –40°C to +125°C, dropout reaches 0.7 V max, so VI must be ≥ 5.7 V; ST specifies 6 V minimum to ensure margin across all conditions including line/load transients.

Does LD29300P2M require an external capacitor on the INH pin?

No. The LD29300P2M is the fixed-output version without an exposed INH pin - confirmed by order code suffix "M" (P2PAK, fixed voltage) and absence of INH terminal in P2PAK mechanical drawings. Inhibit functionality is implemented internally and not user-accessible on this variant.

Can LD29300P2M be used without an output capacitor?

No. A minimum 10 µF ceramic output capacitor is mandatory for stability, as specified in all electrical characteristic test conditions and application circuits. Omitting it causes oscillation and potential device failure due to phase margin loss in the control loop.

Is the P2PAK package RoHS-compliant and lead-free?

Yes. Per STMicroelectronics' product change notices and packaging documentation, the P2PAK package for LD29300P2M is lead-free and RoHS-compliant, with matte tin (Sn) termination and halogen-free molding compound, meeting EU Directive 2011/65/EU and JEDEC J-STD-609 standards.