STMicroelectronics LD39300PT-R Adjustable Linear Voltage Regulator

Reliable Power Management with STMicroelectronics LD39300PT-R

In the ever-evolving landscape of electronic design, precision and reliability remain paramount for engineers developing advanced power systems. The STMicroelectronics LD39300PT-R adjustable linear voltage regulator emerges as a robust solution for applications demanding stable voltage conversion with exceptional thermal and electrical performance. This device, part of STMicroelectronics' legacy power IC portfolio, combines high output current capability, adjustable voltage regulation, and comprehensive protection features to deliver consistent performance in industrial, automotive, and embedded systems.

Key Features for Demanding Applications

Engineered for efficiency, the LD39300PT-R delivers up to 3A of output current while maintaining a minimal dropout voltage of just 0.4V at full load. This low dropout characteristic ensures optimal power conversion efficiency, reducing thermal stress on components in high-current applications. The regulator's adjustable output voltage range (1.22V to 5V) provides design flexibility, allowing engineers to tailor voltage levels for microprocessors, sensors, and peripheral circuits without requiring multiple fixed regulators.

Operating from a 6V maximum input supply, this device incorporates advanced protection mechanisms including over-current and over-temperature safeguards. These features make it particularly suitable for automotive environments where voltage spikes and thermal variations are common. The surface-mount PPAK package with TO-252AD footprint simplifies PCB integration while maintaining excellent thermal dissipation for demanding power applications.

Technical Excellence in Power Regulation

With a quiescent current of just 5µA and maximum supply current of 2.5mA, the LD39300PT-R demonstrates exceptional power efficiency even in standby modes. Its 65dB to 55dB PSRR (Power Supply Rejection Ratio) across 120Hz to 1kHz frequencies ensures clean output voltage with minimal noise interference, making it ideal for sensitive analog circuits and RF modules. The enable control feature allows precise power sequencing in multi-rail systems, while the adjustable output configuration provides design versatility across multiple product platforms.

This obsolete device remains a benchmark for linear regulation performance, offering engineers a proven solution for critical power management tasks. While newer alternatives may offer enhanced features, the LD39300PT-R's battle-tested reliability and straightforward implementation continue to make it a preferred choice for legacy systems and specialized applications requiring guaranteed performance specifications.

Tags: Power Management, Voltage Regulation, Industrial Electronics, Automotive Components, Surface Mount Devices