Silicontent Technology


3.8V-40V Vin, 3.5A, High Efficiency Synchronous Step-down DCDC Converter with Programmable Frequency

Topology: Buck
Input Voltage (min.): 3.80 V
Input Voltage (max.): 40.00 V
Switching Frequency (min.): 100.00 kHz
Switching Frequency (max.): 2200.00 kHz
Output 1: 3.30 V / 3.500 A

Original publication on 2019-06-03, revision 1.2


The SCT2430 is 3.5A synchronous buck converters with wide input voltage, ranging from 3.8V to 40V, which integrates an 80mΩ high-side MOSFET and a 50mΩ low-side MOSFET. The SCT2430, 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 SCT2430 features programmable switching frequency from 100 kHz to 2.2MHz with an external resistor, which provides the flexibility to optimize either efficiency or external component size. The converter supports external clock synchronization with a frequency band from 100kHz to 2.2MHz. The SCT2430 allows power conversion from high input voltage to low output voltage with a minimum 100ns on-time of high-side MOSFET. The SCT2430 is an Electromagnetic Interference (EMI) friendly buck converter with implementing optimized design for EMI reduction. The SCT2430 features Frequency Spread Spectrum FSS with ±6% jittering span of the switching frequency and modulation rate 1/512 of switching frequency to reduce the conducted EMI.The SCT2430 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.


  • Wide Input Range: 3.8V-40V
  • Up to 3.5A Continuous Output Current
  • 0.8V ±1% Feedback Reference Voltage
  • Integrated 80mΩ High-Side and 50mΩ Low-Side Power MOSFETs
  • Pulse Skipping Mode (PSM) with 25uA Quiescent Current in Sleep Mode
  • 100ns Minimum On-time
  • 2ms Internal Soft-start Time
  • Adjustable Frequency 100KHz to 2.2MHz
  • External Clock Synchronization
  • Frequency Spread Spectrum (FSS) Modulation for EMI Reduction
  • Precision Enable Threshold for Programmable Input Voltage Under-voltage Lock Out Protection (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
744325550 PDF WE-HCI SMT Flat Wire High Current Inductor 5.5 10 4.3 12 10.3 30 Superflux SMT