Silicontent Technology


3.8V-36V Vin, 5A, High Efficiency Synchronous Step-down DCDC Converter with Programmable Soft-start Time

Topology: Buck
Input Voltage (min.): 3.80 V
Input Voltage (max.): 36.00 V
Switching Frequency (min.): 500.00 kHz
Switching Frequency (max.): 640.00 kHz
Output 1: 3.30 V / 5.000 A

Original publication on 2018-05-01, revision 1.2


The SCT2451 is 5A synchronous buck converters with wide input voltage, ranging from 3.8V to 36V, which integrates a 45mΩ high-side MOSFET and a 20mΩ low-side MOSFET. The SCT2451, adopting the peak current mode control, supports the Pulse Skipping Modulation (PSM) with typical 25uA low quiescent current which assists the converter on achieving high efficiency at light load or standby condition. The SCT2451 features programmable soft start time with 570kHz switching frequency. The converter allows power conversion from high input voltage to low output voltage with a minimum 100ns on-time of high-side MOSFET. It also supports Low Drop-Out LDO operation at low voltage difference from input to output condition. The SCT2451 is an Electromagnetic Interference (EMI) friendly buck converter with implementing optimized design for EMI reduction. The SCT2451 features Frequency Spread Spectrum FSS with ±6% jittering span of the 570kHz switching frequency and modulation rate 1/512 of switching frequency to reduce the conducted EMI. The SCT2451 offers cycle-by-cycle current limit and hiccup over current protection, thermal shutdown protection, output over-voltage protection and input voltage under-voltage protection. The device is available in an 8-pin thermally enhanced SOP-8 package.


  • 0.8V ±1% Feedback Reference Voltage
  • Integrated 45mΩ High-Side and 20mΩ Low-Side Power MOSFETs
  • Pulse Skipping Mode PSM with 25uA Quiescent Current in Sleep Mode
  • 100ns Minimum On-time
  • Programmable Soft-start Time
  • Fixed Switching Frequency 570kHz
  • Frequency Spread Spectrum FSS Modulation for EMI Reduction
  • Precision Enable Threshold for Programmable Input Voltage Lock Out (UVLO) Threshold and Hysteresis
  • Low Dropout Mode Operation
  • Derivable Inverting Voltage Regulator
  • Over-voltage and Over Temperature Protection
  • Available in an ESOP-8 Package


  Order Code SPEC Product series L
Material Version Samples
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