L5981 Datasheet PDF – 1A, Step-down Switching Regulator

Part Number: L5981

Function: 1A, Step-down Switching Regulator

Package: VFQFPN8 3×3 Type

Manufacturer: STMicroelectronics

Image and Pinouts:

L5981 datasheet



The L5981 is a step-down switching regulator with a 1.5 A (min.) current limited embedded Power MOSFET, so it is able to deliver in excess of 1 A DC current to the load depending on the application condition. The input voltage can range from 2.9 V to 18 V, while the output voltage can be set starting from 0.6 V to VIN . Having a minimum input voltage of 2.9 V, the device is suitable also for a 3.3 V bus.

Requiring a minimum set of external components, the device includes an internal 250 kHz switching frequency oscillator thatcan be externally adjusted up to 1 MHz.
The VFQFPN8 package with an exposed pad allows reducing the RthJA down to approximately 60 °C/W.


1. 1 A DC output current

2. 2.9 V to 18 V input voltage

3. Output voltage adjustable from 0.6 V

4. 250 kHz switching frequency, programmable up to 1 MHz

5. Internal soft-start and inhibit

6. Low dropout operation: 100% duty cycle

7. Voltage feedforward

8. Zero load current operation

9. Overcurrent and thermal protection


1. Consumer: STB, DVD, DVD recorder, car audio, LCD TV and monitors

2. Industrial: chargers, PLD, PLA, FPGA

3. Networking: XDSL, modems, DC-DC modules

4. Computer: optical storage, hard disk drive, printers, audio/graphic cards

5. LED driving


Other data sheets are available within the file: L-5981

L5981 Datasheet PDF Download

L5981 pdf