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 SC4603

Semtech SC4603

Very Low Input, MHz Operation, High-Efficiency Synchronous Buck

Add to Watch List

The SC4603 is a voltage mode step down (buck) regulator controller that provides accurate high efficiency power conversion from input supply range 2.25V to 5.5V. A high level of integration reduces external component count and makes it suitable for low voltage applications where cost, size and efficiency are critical.


  • BiCMOS voltage-mode PWM controller
  • 2.25 V to 5.5 V Input voltage range
  • Output voltages as low as 0.5 V
  • Sleep mode (Icc = 10 μA typ)
  • Lossless adjustable over-current protection
  • Combination pulse by pulse & hiccup mode current limit
  • High-efficiency synchronous switching
  • 0% to 100% duty cycle range
  • Synchronization to external clock
  • Asynchronous start-up
  • 1 MHz frequency of operation
  • 10-pin MSOP surface mount package


  • Distributed power architecture
  • Servers/workstations
  • Local microprocessor core power supplies
  • DSP and I/O power supplies
  • Battery-powered applications
  • Telecommunication equipment
  • Data processing applications



Order Codes

  • SC4603IMSTRT: 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.