L6983I: 38 V 10 W synchronous iso-buck converter for isolated applications



Specifically designed for isolated buck topology, the L6983I’s primary output voltage can be accurately adjusted, while the isolated secondary output is derived by using a given transformer ratio.

The switching frequency can be programmed in the 200 kHz - 1 MHz range with optional spread spectrum for improved EMC. The Enable (EN) pin provides enable/disable functions and includes an internal voltage divider.


Key features

  • 3.5 to 38V operating input voltage
  • Primary output voltage regulation / no optocoupler required
  • 200 kHz to 1 MHz programmable switching frequency.
  • Stable with low ESR capacitor (min. 2 µF)
  • Internal compensation network


  • 2 µA shutdown current
  • Internal soft-start
  • Overvoltage protection
  • Output voltage sequencing

Application examples

igbt Isolated IGBT/SiC MOSFET gate drive supply
on-board-charger OBC (On-board charger) for HEV/EV
power-management Electric traction systems
e-charger Charging stations


Recommended resources


STEVAL-L6983IV1 evaluation board

Based on the L6983I, a 38 V, 10 W synchronous iso-buck converter designed for isolated applications.

eDSim: fast and powerful electrical simulation software for SMPS and analog ICs

Design your analog circuit, get a quick preview with fully annotated schematic and BOM, and then run the electrical simulation through eDSim for fast and accurate simulations and reliable design validation.



Switching Converters (DC-DC) Quick reference guide

This guide provides developers with an overview of our most commonly used switching regulators and will help identify the most appropriate solution for each type of application.

webinar mems pressure sensors

eBikes, drones, and consumer appliances are scaling battery architecture to use more Li-Ion cells in series, which is driving system power to higher voltages. In computing, migration to distributed 48 V server backplane architectures has begun, as rack power increases to meet the demands of cloud computing workloads.

Watch our webinar replay, and you will learn about:

  • DC/DC buck converter operation and feedback control methods
  • Efficiency challenges posed by high step-down voltage conversion
  • Case study of L3751 synchronous DC/DC buck controller