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Power Management
Power Management
FemtoBuck DC-DC Regulators and Controllers

Semtech SC4911

Bias/Primary Side PWM Controller with Ultra-Low Start-up Current

Not recommended for new designs.

The SC4911 is a highly integrated bias/primary side PWM controller designed for off-line or isolated dc-dc converters in telecommunication and data communication applications. The high degree of integration minimizes the amount of discrete parts needed and leads to substantial cost and space saving converter designs.

Overview

Features

  • Programmable switching frequency up to 500kHz
  • Line UVLO Protection
  • Undervoltage Lockout
  • Low startup current (45μA)
  • Cycle by cycle current limit
  • 8 pin MSOP. Available in Lead-free, fully WEEE and RoHS compliant

Applications

  • Telecom isolated converters
  • Offline isolated power supplies
  • Instrumentation power supplies
  • Battery chargers

Packaging

  • MSOP-8

Order Codes

  • SC4911AMSTRT: Lead-Free, RoHS and WEEE Compliant, Package Minimum Tape & Reel Only
  • SC4911BMSTRT: Lead-Free, RoHS and WEEE Compliant, Package Minimum Tape & Reel Only
  • SC4911IMSTR: Package Minimum Tape & Reel Only
  • SC4911IMSTRT: Lead-Free, RoHS and WEEE Compliant, Package Minimum Tape & Reel Only

Block Diagram

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