Analog Devices LT8640S

Description

The LT®8640S synchronous step-down regulator featuressecond generation Silent Switcher architecture designedto minimize EMI/EMC emissions while delivering highefficiency at high switching frequencies. This includesthe integration of bypass capacitors to optimize all thefast current loops inside and make it easier to achieveadvertised EMI performance by reducing layout sensitivity.This performance makes the LT8640S ideal for noisesensitiveapplications and environments.The fast, clean, low overshoot switching edges enable highefficiency operation even at high switching frequencies,leading to a small overall solution size. Peak current modecontrol with a 30ns minimum on-time allows high stepdownratios even at high switching frequencies.Burst Mode operation enables ultralow standby currentconsumption, forced continuous mode can controlfrequency harmonics across the entire output load range,or spread spectrum operation can further reduce EMI/EMCemissions. Soft-start and tracking functionality is accessedvia the TR/SS pin, and an accurate input voltage UVLOthreshold can be set using the EN/UV pin. A CLKOUT pinenables synchronizing other regulators to the LT8640S.

Features

Silent Switcher ®2 Architecturenn Ultralow EMI/EMC Emissions on Any PCBnn Eliminates PCB Layout Sensitivitynn Internal Bypass Capacitors Reduce Radiated EMInn Optional Spread Spectrum Modulationnn High Efficiency at High Frequencynn Up to 96% Efficiency at 1MHz, 12VIN to 5VOUTnn Up to 95% Efficiency at 2MHz, 12VIN to 5VOUTnn Wide Input Voltage Range: 3.4V to 42Vnn 6A Maximum Continuous, 7A Peak Outputnn Ultralow Quiescent Current Burst Mode® Operationnn 2.5μA IQ Regulating 12VIN to 3.3VOUT (LT8640S)nn Output Ripple < 10mVP-Pnn External Compensation: Fast Transient Responseand Current Sharing (LT8643S)nn Fast Minimum Switch On-Time: 30nsnn Low Dropout Under All Conditions: 100mV at 1Ann Forced Continuous Modenn Adjustable and Synchronizable: 200kHz to 3MHznn Output Soft-Start and Trackingnn Small 24-Lead 4mm × 4mm LQFN Package

Typical applications

• nn Automotive and Industrial Supplies
• General Purpose Step-Down

More information

• Datasheet
• IC product information