L4974A is a monolithic power switching regulator delivering 3.5A at a voltage variable from 5.1 to 40V from STMicroelectronics. The device uses a DMOS output transistor to obtain very high efficiency and very fast switching times.
The L4974A is a monolithic step‑down switching regulator that provides up to 3.5 A output current with an adjustable output voltage from 5.1 V to 40 V. It integrates functions such as feed‑forward line regulation, soft‑start, current limiting, thermal shutdown, and reset/power‑fail detection, making it suitable for micro‑processor‑based systems.
The document includes pin descriptions, electrical and thermal characteristics, dynamic performance data, and mechanical dimensions for the Powerdip 16+2+2 package. It also lists typical application circuits and test conditions.
| Maximum Output Current | 3.5 A |
|---|---|
| Output Voltage Range | 5.1 V to 40 V |
| Switching Frequency | up to 200 kHz |
| Input Voltage Maximum | 55 V |
| Thermal Shutdown Temperature | ≈150 °C |
The regulator can deliver up to 3.5 A of output current.
It provides an adjustable output voltage from 5.1 V to 40 V.
The L4974A can switch at frequencies up to 200 kHz.
Yes, it features thermal shutdown that activates around 150 °C.