Overview

Not recommended for new design.

The SC1109 was designed for the latest high speed motherboards. It combines a synchronous voltage mode controller (switching section) with two low-dropout linear regulator controllers. The voltage mode controller provides the power supply for the system AGTL bus. The Dual linear controllers power the chip set and clock circuitry.

Features

  • Dual linear controllers
  • LDOs track input voltage within 200 mV (function of the MOSFETs used) until regulation
  • Integrated drivers
  • Power-good signal (SC1109A, SC1109B)
  • Soft start
  • Lossless current sense
  • Programmable over-current limit (SC1109C)
  • Fixed frequency 200 kHz (SC1109A, SC1109C)
  • Fixed frequency 500 kHz (SC1109B)
  • SO-16 package

Packaging

  • SOIC-16

Order Codes

  • SC1109ACSTR: Package Minimum Tape & Reel Only
  • SC1109ACSTRT: Lead-Free, RoHS and WEEE Compliant, Package Minimum Tape & Reel Only

PB Free/ROHS

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Applications

  • Pentium® III Motherboards
  • Triple power supplies

Inventory

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