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Semtech SC508

EcoSpeed® DC-DC Buck Controller with Integrated LDO


TopologyBuck Converter
Input voltage4.5-46 V
Switching frequency1000 kHz
Output 136 V / 8 A
IC revision4.3


The SC508/SC508A is a synchronous EcoSpeed® buck regulator which incorporates Semtech’s advanced, patented adaptive `on-time control architecture to provide excellent light-load efficiency and fast transient response. It features an integrated bootstrap switch and a fixed 5V LDO in a 3 x 3(mm) package. The device is highly efficient and uses minimal PCB area. The SC508A is available for automotive applications and is qualified to AEC-Q100.The SC508 supports using standard capacitor types such as electrolytic or special polymer, in addition to ceramic, at switching frequencies up to 1MHz. The programmable frequency, synchronous operation, and programmable power-save provide high efficiency operation over a wide load range.Additional features include cycle-by-cycle current limit, programmable soft-start, under and over-voltage protection, programmable over-current protection, start-up into pre-biased output, automatic fault recovery (hiccup restart), soft-shutdown, selectable power-save modes, and programmable ultrasonic power-save. The device also provides separate enable inputs for the PWM controller and LDO as well as a power good output for the PWM controller. Output voltage range is 0.6 to 5V, with output voltages greater than 5V supported using additional components.The input voltage can range from 5V to 46V. The wide input voltage range, programmable frequency, and integrated 5V LDO make the device extremely flexible and easy to use in a broad range of applications. Support is provided for multi-cell battery systems in addition to traditional DC power supply applications.


  • Power system
  • Input voltage — 4.5V to 46V
  • Integrated bootstrap switch
  • Fixed 5V LDO output — 200mA
  • 1% reference tolerance -40 to +85 °C
  • Selectable internal/external bias power supply
  • EcoSpeed® architecture with pseudo-fixed frequency adaptive on-time control
  • Logic input and output control
  • Independent control EN for LDO and switcher
  • Programmable soft-start time
  • Programmable VIN UVLO threshold
  • Power Good output
  • Selectable power-save mode
  • Programmable ultrasonic power-save mode
  • Protections
  • Automatic restart on fault shutdown
  • Over-voltage and under-voltage
  • TC compensated RDS(ON) sensed current limit
  • Thermal shutdown
  • Smart power-save
  • Pre-bias start-up
  • Capacitor types: SP, POSCAP, OSCON, and ceramic
  • Package — 3 x 3(mm), 20-pin MLPQ
  • Lead-free and halogen-free
  • RoHS and WEEE compliant
  • AEC-Q100 Qualified available in SC508A

Typical applications

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