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Semtech SC4525C

28V 3A Step-Down Switching Regulator


TopologyOther Topology
Switching frequency200-2000 kHz
IC revision5.1


The SC4525C is a constant frequency peak current-mode step-down switching regulator capable of producing 3A output current from an input ranging from 3V to 28V. The switching frequency of the SC4525C can be programmed up to 2MHz for component miniaturization or it can be set at lower frequencies to accommodate high step-down ratios. The SC4525C is suitable for next generation XDSL modems, high-definition TVs and various point of load applications.

Peak current-mode PWM control employed in the SC4525C achieves fast transient response with simple loop compensation. Cycle-by-cycle current limiting and hiccup overload protection reduces power dissipation during output overload. Soft-start function reduces input start-up current and prevents the output from overshooting during power-up.

The SC4525C is available in SOIC-8 EDP package.


  • Wide input range: 3V to 28V
  • 3A Output Current
  • 200kHz to 2MHz Programmable Frequency
  • Precision 1V Feedback Voltage
  • Peak Current-Mode Control
  • Cycle-by-Cycle Current Limiting
  • Hiccup Overload Protection with Frequency Foldback
  • Soft-Start and Enable
  • Thermal Shutdown
  • Thermally Enhanced 8-pin SOIC Package
  • Fully RoHS and WEEE compliant


  • Refer page num 17 for more inductor values.

Typical applications

  • Automotive Car Audio
  • DSP Power Supplies
  • Point of Load Applications
  • XDSL and Cable Modems
  • LCD and Plasma TVs
  • Set Top Boxes