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 SC403

Semtech SC403

6A EcoSpeed® Integrated FET Regulator with Programmable LDO

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The SC403 is a stand-alone synchronous EcoSpeed® buck power supply which incorporates Semtech’s advanced patent-pending adaptive on-time control architecture to provide excellent light-load efficiency and fast transient response. It features integrated power MOSFETs, a bootstrap switch, and a programmable LDO in a 5x5mm package. The device is highly efficient and uses minimal PCB area.


  • Power System:
    • Input voltage — 3V to 28V
    • Internal or external bias voltage — 3V to 5V
    • Integrated bootstrap switch
    • Programmable LDO output — 200mA
  • 1% reference tolerance -40 to +85 °C
  • EcoSpeedTM architecture with pseudo-fixed frequency adaptive on-time control
  • Logic Input/Output Control:
    • Independent control EN for LDO and switcher
    • Programmable VIN UVLO threshold
    • Power good output
    • Selectable ultrasonic power save mode
    • Programmable soft start time
  • Protections:
    • Over-voltage and under-voltage
    • TC compensated RDS(ON) sensed current limit
  • Thermal shutdown
  • Any ESR — SP, POSCAP, OSCON, and ceramic capacitors
  • Package:
    • Lead-free package — 5x5mm, 32-pin MLPQ
    • Fully RoHS/WEEE compliant and halogen free


  • Office automation and computing
  • Networking and telecommunication equipment
  • Point of load power supplies and module replacement


  • MLPQ-32

Order Codes

  • SC403MLTRT - Available in tape and reel only. A reel contains 3000 devices.
  • SC403EVB: SC403 Evaluation Board
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