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SCT2431

40V Vin, 3A, 25uA Iq, 570KHz Freq., Adjustable SS, Synchronous Buck Converter

Features
• 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 at Light load
• 25uA Quiescent Current in Sleep Mode
• 100ns Minimum On-time
• Programmable Soft-start Time
• EMI Reduction with Frequency Spread Spectrum (FSS) Modulation
• 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 Protection 
• Over Temperature Protection 
• Available in an ESOP-8Package

Description

The SCT2431 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 SCT2431, 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 SCT2431 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 SCT2431 is an Electromagnetic Interference (EMI) friendly buck converter with implementing optimized design for EMI reduction. The SCT2431 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 SCT2431 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.



Application:

• Battery Pack Powered System - Cordless Power Tools, Cordless Home Appliance, Drone, Aero Modeling, GPS Tracker etc.
• Cigarette Lighter Adapters, Chargers
• LCD Display
• USB Type-C Power Delivery, USB Charging
• Industrial and Medical Distributed Power Supplies
• Optical Communication and Networking System
• Automotive System

Typical application block diagram

Application Notes

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