PWM Controllers
  • SC1102
  • Synchronous Voltage-Mode Controller for Distributed Power-Supply Applications
  • SC1103
  • Asynchronous Voltage-Mode PWM Controller for 12 V Input
  • SC1104A
  • Not Recommended For New Designs
  • SC1104B
  • Simple, Synchronous Voltage-Mode PWM Controller
  • SC1109
  • Synchronous PWM Controller With Dual Low-Dropout Regulator Controllers
  • SC1110
  • Sink and Source DC/DC Controller For Termination Power Supply Applications
  • SC1116
  • Linear FET Controller for DDR Supplies
  • SC1175
  • Low-Power Dual Synchronous DC/DC Controller with Current-Sharing Circuitry
Semtech SC4901

Semtech SC4901

Combi-Sync™ Secondary-Side Synchronous Rectifier and Regulator

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  • Single controller performs synchronous rectification and post regulation
  • Independent regulation of multiple outputs from a common secondary winding
  • Turn-on shoot-through inherently eliminated
  • Primary switch turns ON and OFF with zero current
  • No synchronizing or any other signals needed across the isolation boundary
  • Eliminates the need for a secondary bias supply
  • Independent soft start, ON/OFF, remote sense and current limit for each output
  • Resistive or inductive current sensing with 2 V current signal and 2.5 V reference for external applications
  • 4.5 V to 18 V operation
  • Max. operating frequency to 1 MHz
  • Low-profile 16-pin TSSOP package
  • Based on Semtech’s patent-pending Combi-Sync™ concept


  • Telecom isolated DC-to-DC converters with multiple low-voltage outputs
  • High-density brick and sub-brick modules with independently regulated multiple outputs
  • Distributed power architectures
  • Isolated VRMs



Order Codes

  • SC4901ITSTRT: Lead-Free, RoHS and WEEE Compliant, Package Minimum Tape & Reel Only
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