STMicroelectronics LD29300P2M80R

Overview

LD29300P2M80R from STMicroelectronics is a fixed-output, logic-controlled low-dropout linear voltage regulator delivering 8.0 V at up to 3 A with ±1% output voltage tolerance at 25°C, 0.4 V typical dropout at 3 A, and integrated thermal/current protection. It serves as a post-regulation stage in high-current power supplies for monitors, TVs, and industrial embedded systems requiring stable, low-noise DC bias.

For engineers reviewing the LD29300P2M80R datasheet, LD29300P2M80R pinout, LD29300P2M80R application, or LD29300P2M80R equivalent, key selection criteria include guaranteed 3 A output current, 0.4 V dropout at full load, logic-enabled shutdown (INH pin), 320 µV_RMS output noise, and P2PAK package thermal performance (R_thj-case = 3 °C/W).

Technical Context

The LD29300P2M80R implements a PNP-based LDO architecture with internal reference, error amplifier, and pass transistor - enabling ultra-low dropout while maintaining stability with 10 µF ceramic output capacitance. Its inhibit function accepts TTL-compatible logic levels (V_IL ≤ 0.8 V, V_IH ≥ 2 V) to enable/disable regulation without external circuitry.

Thermal protection activates at T_j = 125 °C, and current limiting engages at 4.5 A short-circuit current. The device operates across –40 °C to +125 °C junction temperature and supports input voltages from 9 V to 13 V for 8 V output, with supply voltage rejection of 45–59 dB at 120 Hz.

Key Specifications

Pinout & Package

P2PAK package (7226255/B mechanical drawing): thermally enhanced surface-mount variant with exposed drain pad for PCB heat sinking; footprint compatible with D2PAK but optimized for higher power density and lower R_thj-amb.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LD29300P2M80R, STLD29300P2M80R offers identical regulation performance with optimized logistics for SMT lines, while LD29300P2T80 provides identical functionality in tube format - both eliminate redesign risk and maintain thermal behavior, differing only in packaging and traceability.

Availability

LD29300P2M80R is available at Aetrix Electronics and suitable for monitor power supplies, industrial PLC I/O modules, battery-powered test equipment, and set-top box audio subsystems requiring stable component supply with guaranteed 3 A output and low-dropout operation.

Supply support for LD29300P2M80R 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 space-constrained, thermally demanding applications where dropout voltage, noise, and reliability are critical.

FAQ

What is the minimum input voltage required for LD29300P2M80R to regulate 8.0 V at 3 A?

The minimum operating input voltage is 9.0 V - derived from the 8.0 V output plus 0.4 V typical dropout at 3 A, with margin for worst-case 0.7 V max dropout per datasheet. Operation below 9.0 V risks dropout and output collapse under full load.

Can LD29300P2M80R be used without the INH pin connected?

Yes - the INH pin is internally pulled up; leaving it open defaults the device to ON mode. However, for robust noise immunity in industrial environments, ST recommends tying INH to V_IN via a 10 kΩ resistor rather than floating.

What output capacitor value and type are required for stability?

A minimum 10 µF ceramic capacitor with ≤10 mΩ ESR is required at the OUT pin. ST validates stability with X7R/X5R types; tantalum or aluminum electrolytics are not recommended due to higher ESR and aging effects that may cause oscillation.

How does thermal performance differ between P2PAK and D2PAK packages for this device?

P2PAK has identical R_thj-case (3 °C/W) to D2PAK but lower R_thj-amb (60 °C/W vs. 50 °C/W for D2PAK), meaning P2PAK achieves better heat transfer to PCB copper. This allows higher sustained current in compact layouts without additional heatsinking.