The L5973D is a step-down monolithic power switching regulator with a minimum switch current limit of 2.5A, allowing it to deliver over 2A DC current to the load depending on the application conditions. The output voltage can be adjusted from 1.235V to 35V. The high current level is achieved thanks to an SO8 package with an exposed frame, which reduces the Rth(j-amb) to approximately 40°C/W. The device uses an internal P-Channel D-MOS transistor (with a typical Rdson of 250mΩ) as the switching element to minimize the size of external components. An internal oscillator sets the switching frequency at 250KHz. With a minimum input voltage of only 4.4V, it is particularly suitable for applications with a 5V bus available in computer-related applications. Pulse by pulse current limit
The L5973D is a monolithic step‑down switching regulator that delivers up to 2.5 A continuous current. It operates from an input voltage of 4.4 V to 36 V and provides an adjustable output voltage range of 1.235 V to 35 V. The device includes internal current limiting, thermal shutdown, zero‑load‑current operation, and synchronization features, and it runs at a fixed 250 kHz switching frequency.
Typical applications include consumer electronics (STB, DVD, TV, VCR, car radio, LCD monitors), networking equipment (xDSL, modems), computers (printers, audio/graphic cards, optical storage, hard‑disk drives), and industrial chargers. The datasheet provides pin descriptions, electrical characteristics, thermal data, a demo‑board application circuit, component list, and mechanical dimensions.
| Operating input voltage range | 4.4 V to 36 V |
|---|---|
| Adjustable output voltage | 1.235 V to 35 V |
| Switching frequency | 250 kHz |
The regulator can operate with an input voltage as low as 4.4 V.