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Semtech SC9301

10A EcoSpeed® Integrated FET Regulator with 5V LDO and Hiccup Restart


TopologyBuck Converter
Input voltage3-28 V
Switching frequency200-1000 kHz
Output 11.5 V / 10 A
IC revision2.1


The SC9301 is a stand-alone synchronous EcoSpeed® buck regulator with adaptive on-time control architecture. It features integrated power MOSFETs, a bootstrap switch, and a fi xed 5V LDO in a 5x5mm package. The device is highly effi cient and uses minimal PCB area. The SC9301 supports using standard capacitor types such as electrolytic or specialty polymer, in addition to ceramic, at switching frequencies up to 1MHz.

Additional features include programmable cycle-by-cycle current limit protection, programmable soft-start, under and over-voltage protection, automatic fault recovery (hiccup restart), and soft shutdown. The device also provides separate enable inputs for the PWM controller and LDO as well as a power good output for the PWM controller.


  • Power system
  • Input voltage — 3V to 28V
  • Bias Voltage — 5V LDO or 3V to 5.5V external
  • Up to 96% peak effi ciency
  • Integrated bootstrap switch
  • LDO output current — up to 200mA
  • Reference tolerance — 1% TJ= -40 to +125 °C
  • EcoSpeed® architecture with pseudo-fi xed frequency
  • adaptive on-time control
  • Pre-bias start-up
  • Logic input and output control
  • Independent enable control for LDO and switcher
  • Programmable VIN UVLO threshold
  • Power good output
  • Programmable soft-start time
  • All protection: automatic restart on fault
  • Over-voltage and under-voltage
  • TC compensated RDS(ON) sensed current limit
  • Thermal shutdown
  • Smart gate drive reduces EMI
  • Capacitor types: SP, POSCAP, OSCON, and ceramic
  • Package — 5 x 5(mm), 32-pin MLPQ
  • Lead-free and halogen-free
  • RoHS and WEEE compliant

Typical applications

  • Point-of-load power supplies and module replacement
  • Networking and telecommunication equipment
  • Printers, DSL, and STB applications