LT8640S

LT8640S/LT8643S 42V, 6A Synchronous Step-Down Silent Switcher 2 with 2.5µA Quiescent Current FEATURES n Silent Switcher ®2 Architecture n Ultralow EMI Emissions on Any PCB n Eliminates PCB Layout Sensitivity n Internal Bypass Capacitors Reduce Radiated EMI n Optional Spread Spectrum Modulation n High Efficiency at High Frequency n Up to 96% Efficiency at 1MHz, 12VIN to 5VOUT n Up to 95% Efficiency at 2MHz, 12VIN to 5VOUT n Wide Input Voltage Range: 3.4V to 42V n 6A Maximum Continuous, 7A Peak Output n Ultralow Quiescent Current Burst Mode® Operation n 2.5µA IQ Regulating 12VIN to 3.3VOUT (LT8640S) n Output Ripple < 10mVP-P n External Compensation: Fast Transient Response and Current Sharing (LT8643S) n Fast Minimum Switch On-Time: 30ns n Low Dropout Under All Conditions: 100mV at 1A n Forced Continuous Mode n Adjustable and Synchronizable: 200kHz to 3MHz n Output Soft-Start and Tracking n Small 24-Lead 4mm × 4mm LQFN Package n AEC-Q100 Qualified for Automotive Applications APPLICATIONS n Automotive and Industrial Supplies n General Purpose Step-Down DESCRIPTION The LT®8640S/LT8643S synchronous step-down regulator features second generation Silent Switcher architecture designed to minimize EMI emissions while delivering high efficiency at high switching frequencies. This includes the integration of bypass capacitors to optimize all the fast current loops inside and make it easy to achieve advertised EMI performance by reducing layout sensitivity. This performance makes the L...