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 SC4905B

Semtech SC4905B

High-Performance Voltage-Mode PWM Controller

Add to Watch List

The SC4905A/B is a 10 pin BICMOS primary side voltage mode controller for use in Isolated DC-DC and off-line switching power supplies.


  • Operation to 1 MHz
  • Accurate programmable maximum duty cycle
  • Integrated oscillator/voltage feed forward compensation
  • Line voltage monitoring
  • External frequency synchronization
  • Bi-phase mode of operation for ripple reduction
  • Under 100 µA start-up current
  • Accessible reference voltage
  • VDD under-voltage lockout
  • -40°C to +105°C operating temperature
  • 10-lead MSOP package


  • Telecom equipment and power supplies
  • Networking power supplies
  • Power over LAN applications
  • Industrial power supplies
  • Isolated power supplies



Order Codes

  • SC4905BIMSTR: Package Minimum Tape & Reel Only
  • SC4905BIMSTRT: Lead-Free, RoHS and WEEE Compliant, Package Minimum Tape & Reel Only
- Close -
Add Product to Watch List

Please login to the mySemtech member site to add products to your personal Watch List.

If you're not registered for mySemtech, please Register now. mySemtech member benefits include pre-filled forms for quick and easy online ordering, technical support, new product information and more.