Key facts
- Brand
- STMicroelectronics
- Model
- L4975A
- Industry
- Industrial
- Documents
- 2
- Languages
- EN
- Last added
- 2012-08-10
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ST L4975A 5A SWITCHING REGULATOR handbook
The L4975A is a stepdown monolithic power switching regulator delivering 5A at a voltage vari- able from 5.1 to 40V. Realized with BCD mixed technology, the device uses a DMOS output transistor to obtain very high efficiency and very fast switching times. Features of the L4975A include reset and power fail for mi- croprocessors, feed forward line regulation, soft start, limiting current and thermal protection. The device is mounted in a 15-lead multiwatt plastic power package and requires few external compo- nents. Efficient operation at switching frequencies up to 500KHz allows reduction in the size and cost of external filter components.
Read onlineSTMicroelectronics L4975A specifications
| Output Current | 5 A |
|---|---|
| Output Voltage Range | 5.1 V to 40 V |
| Switching Frequency | up to 500 kHz |
| Reference Voltage | 5.1 V ±2 % |
| Input Voltage (max) | 55 V |
| Efficiency (typical at 12 V) | ≈80 % |
| Thermal Shutdown Temperature | ≈150 °C |
All STMicroelectronics L4975A documents by type
Ratings, dimensions and ordering codes, for selection and design work.
Questions answered in these manuals
What is the reference voltage of the L4975A?
The device uses a precise on‑chip reference of 5.1 V ±2 %.
How does the L4975A protect against over‑current?
It includes a soft‑start function and a current‑limit circuit that shuts off the power DMOS when the load current exceeds a preset threshold.