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 SC1189

Semtech SC1189

Programmable Synchronous DC/DC Converter, Dual LDO Controller

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The SC1189 combines a synchronous voltage mode controller with two low-dropout linear regulators providing most of the circuitry necessary to implement three DC/DC converters for powering advanced microprocessors such as Pentium®III.


  • Synchronous design, enables no heatsink solution
  • 95% efficiency (switching section)
  • 5-bit DAC for output programmability
  • Designed for Intel Pentium® III requirements
  • 1.25 V, 2.5 V short-circuit-protected linear controllers
  • Linear controllers adjustable to 1.8 V chipset.
  • VRM 8.5 Compliant
  • VRM 8.4 Compliant (1.3 V to 1.8 V)
  • 1.0% accuracy (1.6 V to 1.8 V)
  • On-chip power-good signal
  • Available in Lead free package, fully WEEE and RoHS compiant


  • Pentium® III microprocessor supplies
  • 1.050 V to 1.825 V microprocessor supplies
  • Programmable triple power supplies



Order Codes

  • SC1189SWTR: Package Minimum Tape & Reel Only
  • SC1189SWTRT: Lead-free, RoHS and WEEE compliant, 1000 pcs. Tape & Reel
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