Switching Regulators
  • SC195F
  • 3.5MHz, 500mA Synchronous Step Down DC-DC Regulator
  • SC202F
  • 3.5MHz, 500mA Step-down Regulator with Integrated Inductor
  • SC21150
  • Tiny 1.2A Synchronous Buck Regulator
  • SC21152
  • Tiny 1.2A Synchronous Buck Regulator with Power Good
  • SC21154
  • Tiny 1.2A Synchronous Buck Regulator with Programmable Soft Start
  • SC221
  • 20MHz, 650mA, X-EMI™-Enabled Synchronous Step-Down Regulator
  • SC284A
  • Dual Channel 2.5MHz, 2.0A Synchronous Buck Regulator
  • SC284AQ
  • Dual Channel 2.5MHz, 1.7A Synchronous Buck Regulator
Semtech SC121

Semtech SC121

Low Voltage Synchronous Boost Regulator

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The SC121 is a high efficiency, low noise, synchronous step-up DC-DC converter that provides boosted voltage levels in low-voltage handheld applications. The wide input voltage range allows use in systems with single NiMH or alkaline battery cells as well as in systems with higher voltage battery supplies.


  • Input voltage — 0.7V to 4.5V
  • Minimum start-up voltage — 0.85V
  • Output voltage — fixed at 3.3V; adjustable from 1.8V to 5.0V
  • Peak input current limit — 1.2A
  • Output current at 3.3 VOUT — 80mA with VIN = 1.0V,
  • 190mA with VIN = 1.5V
  • Forced PWM operation at all loads
  • Efficiency up to 94%
  • Internal synchronous rectifier
  • No forward conduction path during shutdown
  • Switching frequency — 1.2MHz
  • Soft-start startup current limiting
  • Shutdown current — 0.1μA (typ)
  • Ultra-thin 1.5 x 2.0 x 0.6 (mm) MLPD-UT-6 package
  • Lead-free and halogen-free
  • WEEE and RoHS compliant


  • MP3 players
  • Smart phones and cellular phones
  • Palmtop computers and handheld instruments
  • PCMCIA cards and memory cards
  • Digital cordless phones
  • Personal medical products
  • Wireless VoIP phones
  • Small motors


  • MLPD-UT-6

Order Codes

  • SC121ULTRT
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