42V, 750mA Synchronous Step-Down Regulator with 2.5A Quiescent Current Features: Wide Input Voltage Range: 3.0V to 42V Ultralow Quiescent Current Burst Mode® Operation: <3µA IQ Regulating 12VIN to 3.3VOUT Output Ripple <10mVP-P High Efficiency 2MHz Synchronous Operation >93% Efficiency at 0.5A, 12VIN to 5VOUT 750mA Maximum Continuous Output Fast Minimum Switch-On Time: 35ns Adjustable and Synchronizable: 200kHz to 2.2MHz Allows Use of Small Inductors Spread Spectrum Frequency Modulation for Low EMI Low Dropout Peak Current Mode Operation Accurate 1V Enable Pin Threshold Internal Compensation Output Soft-Start and Tracking Small Thermally Enhanced 10-Lead MSOP Package or 8-Lead 2mm × 2mm DFN Package AEC-Q100 Qualified for Automotive Applications

42V, 1.5A Synchronous Step-Down Regulator with 3A Quiescent Current Features: Silent Switcher® 2 Architecture Ultralow EMI/EMC Emissions on Any PCB Eliminates PCB Layout Sensitivity Internal Bypass Capacitors Reduce Radiated EMI Optional Spread Spectrum Modulation Wide Input Voltage Range: 3.0V to 42V Ultralow Quiescent Current Burst Mode® Operation: <3μA IQ Regulating 12VIN to 3.3VOUT Output Ripple <10mVP-P High Efficiency 2MHz Synchronous Operation: >90% Efficiency at 0.75A, 5VOUT from 12VIN 1.5A Continuous Output Current Fast Minimum Switch-On Time: 35ns Adjustable and Synchronizable: 200kHz to 2.2MHz Allows Use of Small Inductors Low Dropout Peak Current Mode Operation Internal Compensation Output Soft-Start and Tracking Small 12-Lead LQFN Package

42V, 2A/3A Peak Synchronous Step-Down Regulator with 2.5A Quiescent Current Features: Silent Switcher® 2 Architecture Ultralow EMI Emissions on Any PCB Eliminates PCB Layout Sensitivity Internal Bypass Capacitors Reduce Radiated EMI Optional Spread Spectrum Modulation Wide Input Voltage Range: 3.0V to 42V Ultralow Quiescent Current Burst Mode® Operation: <2.5µA IQ Regulating 12VIN to 3.3VOUT Output Ripple <10mVP-P High Efficiency 2MHz Synchronous Operation: >93% Efficiency at 1A, 12VIN to 5VOUT 2A Maximum Continuous Output, 3A Peak Transient Output Fast Minimum Switch-On Time: 45ns Adjustable and Synchronizable: 200kHz to 2.2MHz Allows Use of Small Inductors Low Dropout Peak Current Mode Operation Internal Compensation Output Soft-Start and Tracking Small 16-Lead 3mm × 3mm LQFN Package AEC-Q100 Qualified for Automotive Applications

42V, 2A/3A Peak Synchronous Step-Down Regulator with 2.5A Quiescent Current Features: Silent Switcher® 2 Architecture Ultralow EMI Emissions on Any PCB Eliminates PCB Layout Sensitivity Internal Bypass Capacitors Reduce Radiated EMI Optional Spread Spectrum Modulation Wide Input Voltage Range: 3.0V to 42V Ultralow Quiescent Current Burst Mode® Operation: <2.5µA IQ Regulating 12VIN to 3.3VOUT Output Ripple <10mVP-P High Efficiency 2MHz Synchronous Operation: >93% Efficiency at 1A, 12VIN to 5VOUT 2A Maximum Continuous Output, 3A Peak Transient Output Fast Minimum Switch-On Time: 45ns Adjustable and Synchronizable: 200kHz to 2.2MHz Allows Use of Small Inductors Low Dropout Peak Current Mode Operation Internal Compensation Output Soft-Start and Tracking Small 16-Lead 3mm × 3mm LQFN Package AEC-Q100 Qualified for Automotive Applications

42V, 2.5A Synchronous Step-Down Regulator with 2.5A Quiescent Current Features: Wide Input Voltage Range: 3.4V to 42V Ultralow Quiescent Current Burst Mode® Operation: 2.5μA IQ Regulating 12VIN to 3.3VOUT Output Ripple < 10mVP-P High Efficiency Synchronous Operation: 96% Efficiency at 1A, 5VOUT from 12VIN 94% Efficiency at 1A, 3.3VOUT from 12VIN Fast Minimum Switch-On Time: 50ns Low Dropout Under All Conditions: 200mV at 1A Allows Use Of Small Inductors Low EMI Adjustable and Synchronizable: 200kHz to 2.2MHz Current Mode Operation Accurate 1V Enable Pin Threshold Internal Compensation Output Soft-Start and Tracking Small Thermally Enhanced 16-Lead MSOP Package AEC-Q100 Qualified for Automotive Applications

42V, 2.5A Synchronous Step-Down Regulator with 2.5A Quiescent Current Features: Wide Input Voltage Range: 3.4V to 42V Ultralow Quiescent Current Burst Mode® Operation: 2.5μA IQ Regulating 12VIN to 3.3VOUT Output Ripple < 10mVP-P High Efficiency Synchronous Operation: 96% Efficiency at 1A, 5VOUT from 12VIN 94% Efficiency at 1A, 3.3VOUT from 12VIN Fast Minimum Switch-On Time: 50ns Low Dropout Under All Conditions: 200mV at 1A Allows Use Of Small Inductors Low EMI Adjustable and Synchronizable: 200kHz to 2.2MHz Current Mode Operation Accurate 1V Enable Pin Threshold Internal Compensation Output Soft-Start and Tracking Small Thermally Enhanced 16-Lead MSOP Package AEC-Q100 Qualified for Automotive Applications

Dual 42V Synchronous Monolithic Step-Down Regulator with 6.5A Quiescent Current Features: Wide Input Voltage Range: 3.4V to 42V 2.5A and 1.5A Buck Regulators with Separate Inputs Fast Minimum Switch On-Time: 35ns Ultralow Quiescent Current Burst Mode® Operation: 6.5μA IQ Regulating 12VIN to 5VOUT and 3.3VOUT Output Ripple < 15mV 180° Out of Phase Switching Adjustable: 200kHz to 3MHz Synchronizable: 250kHz to 3MHz Accurate 1V Enable Pin Thresholds Internal Compensation Output Soft-Start and Tracking TSSOP Package: Output Stays at or Below Regulation Voltage During Adjacent Pin Short or When a Pin Is Left Floating Thermally Enhanced 28-Lead TSSOP and 3mm × 6mm QFN Packages

42V, 5A/7A Peak Synchronous Step-Down Silent Switcher with 2.5A Quiescent Current Features: Silent Switcher® Architecture Ultralow EMI Emissions Optional Spread Spectrum Modulation High Efficiency at High Frequency Up to 96% Efficiency at 1MHz, 12VIN to 5VOUT Up to 95% Efficiency at 2MHz, 12VIN to 5VOUT Wide Input Voltage Range: 3.4V to 42V 5A Maximum Continuous, 7A Peak Transient Output Ultralow Quiescent Current Burst Mode® Operation 2.5µA IQ Regulating 12VIN to 3.3VOUT Output Ripple < 10mVP-P Fast Minimum Switch On-Time: 30ns Low Dropout Under All Conditions: 100mV at 1A Forced Continuous Mode Adjustable and Synchronizable: 200kHz to 3MHz Output Soft-Start and Power Good Small 20-Lead 4mm × 3mm LQFN Package AEC-Q100 Qualified for Automotive Applications

42V, 5A/7A Peak Synchronous Step-Down Silent Switcher with 2.5A Quiescent Current Features: Silent Switcher® Architecture Ultralow EMI Emissions Optional Spread Spectrum Modulation High Efficiency at High Frequency Up to 96% Efficiency at 1MHz, 12VIN to 5VOUT Up to 95% Efficiency at 2MHz, 12VIN to 5VOUT Wide Input Voltage Range: 3.4V to 42V 5A Maximum Continuous, 7A Peak Transient Output Ultralow Quiescent Current Burst Mode® Operation 2.5µA IQ Regulating 12VIN to 3.3VOUT Output Ripple < 10mVP-P Fast Minimum Switch On-Time: 30ns Low Dropout Under All Conditions: 100mV at 1A Forced Continuous Mode Adjustable and Synchronizable: 200kHz to 3MHz Output Soft-Start and Power Good Small 20-Lead 4mm × 3mm LQFN Package AEC-Q100 Qualified for Automotive Applications

42V, 5A/7A Peak Synchronous Step-Down Silent Switcher with 2.5A Quiescent Current Features: Silent Switcher® Architecture Ultralow EMI Emissions Optional Spread Spectrum Modulation High Efficiency at High Frequency Up to 96% Efficiency at 1MHz, 12VIN to 5VOUT Up to 95% Efficiency at 2MHz, 12VIN to 5VOUT Wide Input Voltage Range: 3.4V to 42V 5A Maximum Continuous, 7A Peak Transient Output Ultralow Quiescent Current Burst Mode® Operation 2.5µA IQ Regulating 12VIN to 3.3VOUT Output Ripple < 10mVP-P Fast Minimum Switch On-Time: 30ns Low Dropout Under All Conditions: 100mV at 1A Forced Continuous Mode Adjustable and Synchronizable: 200kHz to 3MHz Output Soft-Start and Power Good Small 20-Lead 4mm × 3mm LQFN Package AEC-Q100 Qualified for Automotive Applications

42V, 10A/12A Peak Synchronous Step-Down Silent Switcher 2 Features: Silent Switcher®2 Architecture Ultralow EMI Emissions on Any PCB Eliminates PCB Layout Sensitivity Internal Bypass Capacitors Reduce Radiated EMI Optional Spread Spectrum Modulation High Efficiency at High Frequency Up to 96% Efficiency at 1MHz, 12VIN to 5VOUT Up to 94% Efficiency at 2MHz, 12VIN to 5VOUT Wide Input Voltage Range: 2.8V to 42V 10A Maximum Continuous, 12A Peak Transient Output Reference Accuracy: ±1% Over Temperature Fast Transient Response with External Compensation Low Quiescent Current Burst Mode® Operation 90A IQ Regulating 12VIN to 5VOUT Output Ripple P-P Fast Minimum Switch On-Time: 25ns PolyPhase® Operation: Up to 12 Phases Low Dropout Under All Conditions: 45mV at 1A Adjustable and Synchronizable: 200kHz to 3MHz Output Soft-Start and Power Good Safely Tolerates High Reverse Current 28-Lead 5mm × 4mm LQFN Package AEC-Q100 Qualified for Automotive Applications

42V, 6A Synchronous Step-Down Silent Switcher 2 with 2.5A Quiescent Current Features: Silent Switcher ®2 Architecture Ultralow EMI Emissions on Any PCB Eliminates PCB Layout Sensitivity Internal Bypass Capacitors Reduce Radiated EMI Optional Spread Spectrum Modulation High Efficiency at High Frequency Up to 96% Efficiency at 1MHz, 12VIN to 5VOUT Up to 95% Efficiency at 2MHz, 12VIN to 5VOUT Wide Input Voltage Range: 3.4V to 42V 6A Maximum Continuous, 7A Peak Output Ultralow Quiescent Current Burst Mode® Operation 2.5μA IQ Regulating 12VIN to 3.3VOUT (LT8640S) Output Ripple < 10mVP-P External Compensation: Fast Transient Response and Current Sharing (LT8643S) Fast Minimum Switch On-Time: 30ns Low Dropout Under All Conditions: 100mV at 1A Forced Continuous Mode Adjustable and Synchronizable: 200kHz to 3MHz Output Soft-Start and Tracking Small 24-Lead 4mm × 4mm LQFN Package AEC-Q100 Qualified for Automotive Applications

65V, 3.5A Synchronous Step-Down Silent Switcher with 2.5A Quiescent Current Features: Silent Switcher® Architecture Ultralow EMI Emissions Spread Spectrum Frequency Modulation High Efficiency at High Frequency Up to 95% Efficiency at 1MHz, 12VIN to 5VOUT Up to 94% Efficiency at 2MHz, 12VIN to 5VOUT Wide Input Voltage Range: 3V to 65V 3.5A Maximum Continuous Output, 5A Peak Transient Output Fast Minimum Switch-On Time: 35ns Ultralow Quiescent Current Burst Mode® Operation 2.5μA IQ Regulating 12VIN to 3.3VOUT Output Ripple < 10mVP-P Low Dropout Under All Conditions: 130mV at 1A Safely Tolerates Inductor Saturation in Overload Adjustable and Synchronizable: 200kHz to 3MHz Peak Current Mode Operation Output Soft-Start and Tracking Small 18-Lead 3mm × 4mm QFN AEC-Q100 Qualified for Automotive Applications

18V, 10A Synchronous Step-Down Silent Switcher Features: Silent Switcher® Architecture Ultralow EMI Emissions Optional Spread Spectrum Modulation High Efficiency at High Frequency Up to 96% Efficiency at 1MHz, 12VIN to 3.3VOUT Up to 95% Efficiency at 2MHz, 12VIN to 3.3VOUT Wide Input Voltage Range: 2.8V to 18V 10A Output Current External Compensation: Fast Transient Response and Current Sharing Low Quiescent Current Burst Mode® Operation 240μA IQ Regulating 12VIN to 1.2VOUT Output Ripple: <10mVP-P Fast Minimum Switch On-Time: 20ns Low Dropout Under All Conditions: 50mV at 1A Forced Continuous Mode Adjustable and Synchronizable: 200kHz to 3MHz Output Soft-Start and Power Good Small 20-Lead 3mm × 4mm LQFN Package

42V, 6A Synchronous Step-Down Silent Switcher 2 with 2.5A Quiescent Current Features: Silent Switcher ®2 Architecture Ultralow EMI Emissions on Any PCB Eliminates PCB Layout Sensitivity Internal Bypass Capacitors Reduce Radiated EMI Optional Spread Spectrum Modulation High Efficiency at High Frequency Up to 96% Efficiency at 1MHz, 12VIN to 5VOUT Up to 95% Efficiency at 2MHz, 12VIN to 5VOUT Wide Input Voltage Range: 3.4V to 42V 6A Maximum Continuous, 7A Peak Output Ultralow Quiescent Current Burst Mode® Operation 2.5μA IQ Regulating 12VIN to 3.3VOUT (LT8640S) Output Ripple < 10mVP-P External Compensation: Fast Transient Response and Current Sharing (LT8643S) Fast Minimum Switch On-Time: 30ns Low Dropout Under All Conditions: 100mV at 1A Forced Continuous Mode Adjustable and Synchronizable: 200kHz to 3MHz Output Soft-Start and Tracking Small 24-Lead 4mm × 4mm LQFN Package AEC-Q100 Qualified for Automotive Applications

8V, 16A Synchronous Step-Down Silent Switcher 2 Features: Silent Switcher®2 Architecture Ultralow EMI Emissions on Any PCB Internal Bypass Capacitors Reduce Radiated EMI Optional Spread Spectrum Modulation High Efficiency at High Frequency Up to 94% Efficiency at 2MHz, 3.3VIN to 1.2VOUT Up to 93% Efficiency at 2MHz, 5VIN to 1.2VOUT PVIN Range: 1.5V to 8V, SVIN Range: 2.7V to 8V VOUT Range: 0.6V to VIN Reference Accuracy: ±0.8% Over Temperature PolyPhase® Operation: Up to 12 Phases Fast Transient Response with External Compensation Forced Continuous Mode Operation Low Quiescent Current Burst Mode® Operation 180μA IQ Regulating 5VIN to 1.2VOUT Output Ripple < 10mVP-P Fast Minimum Switch On-Time: 20ns Adjustable and Synchronizable: 300kHz to 3.5MHz Output Soft-Start and Power Good Small 24-Lead 4mm × 4mm LQFN Package AEC-Q100 Qualified for Automotive Applications

65V, 8A Synchronous Step-Down Silent Switcher with 2.5A Quiescent Current Features: Silent Switcher® Architecture Ultralow EMI Emissions Optional Spread Spectrum Modulation Up to 95% Efficiency at 1MHz, 12VIN to 5VOUT Up to 94% Efficiency at 2MHz, 12VIN to 5VOUT Wide Input Voltage Range: 3.4V to 65V Ultralow Quiescent Current Burst Mode Operation 2.5μA IQ Regulating 12VIN to 3.3VOUT Output Ripple < 10mVP-P Fast Minimum Switch On-Time: 40ns Low Dropout Under All Conditions: 60mV at 1A Adjustable and Synchronizable: 200kHz to 2.2MHz Peak Current Mode Operation Output Soft-Start and Tracking Small 32-Lead 6mm × 4mm LQFN Package AEC-Q100 Qualification In Progress

65V, 8A Synchronous Step-Down Silent Switcher 2 with 2.5A Quiescent Current Features: Silent Switcher®2 Architecture Ultralow EMI Emissions on Any PCB Eliminates PCB Layout Sensitivity Internal Bypass Capacitors Reduce Radiated EMI Optional Spread Spectrum Modulation High Efficiency at High Frequency Up to 95% Efficiency at 1MHz, 12VIN to 5VOUT Up to 94% Efficiency at 2MHz, 12VIN to 5VOUT Wide Input Voltage Range: 3.4V to 65V Ultralow Quiescent Current Burst Mode Operation 2.5μA IQ Regulating 12VIN to 3.3VOUT (LT8645S) Output Ripple < 10mVP-P External Compensation: Fast Transient Response and Current Sharing (LT8646S) Fast Minimum Switch On-Time: 40ns Low Dropout Under All Conditions: 60mV at 1A Adjustable and Synchronizable: 200kHz to 2.2MHz Peak Current Mode Operation Output Soft-Start and Tracking Small 32-Lead 6mm × 4mm LQFN Package AEC-Q100 Qualified for Automotive Applications

42V, 15A SynchronousStep-Down Silent Switcher 2 Features: Silent Switcher®2 Architecture Ultralow EMI Emissions on Any PCB Eliminates PCB Layout Sensitivity Internal Bypass Capacitors Reduce Radiated EMI Optional Spread Spectrum Modulation High Efficiency at High Frequency Up to 95.5% Efficiency at 1MHz, 12VIN to 5VOUT Up to 93% Efficiency at 2MHz, 12VIN to 5VOUT Low Quiescent Current Burst Mode® Operation 100μA IQ Regulating 12VIN to 5VOUT Output Ripple < 10mVP-P Wide Input Voltage Range: 3V to 42V 15A Output Current External Compensation: Fast Transient Response and Current Sharing Fast Minimum Switch On-Time: 25ns Low Dropout Under All Conditions: 35mV at 1A Forced Continuous Mode Adjustable and Synchronizable: 200kHz to 2.2MHz Output Soft-Start and Power Good Safely Tolerates High Reverse Current Small 36-Lead 7mm × 4mm LQFN Package AEC-Q100 Qualified for Automotive Applications

Dual Channel 4A, 42V, Synchronous Step-Down Silent Switcher 2 with 6.2A Quiescent Current Features: Silent Switcher®2 Architecture: Ultralow EMI on Any PCB Eliminates PCB Layout Sensitivity Internal Bypass Capacitors Reduce Radiated EMI Optional Spread Spectrum Modulation 4A DC from Each Channel Simultaneously Up to 6A on Either Channel Ultralow Quiescent Current Burst Mode® Operation: 6.2μA IQ Regulating 12VIN to 5VOUT1 and 3.3VOUT2 Output Ripple <10mVP-P Forced Continuous Mode Optional External VC Pin: Fast Transient Response and Current Sharing (Extra 50µA IQ/Channel) High Efficiency at High Frequency 94.6% Efficiency at 2A, 5VOUT from 12VIN at 2MHz 93.3% Efficiency at 4A, 5VOUT from 12VIN at 2MHz Fast Minimum Switch-On Time: 40ns Wide Input Voltage Range: 3.0V to 42V Adjustable and Synchronizable: 300kHz to 3MHz Small 4mm × 6mm 32-Pin LQFN Package AEC-Q100 Qualified for Automotive Applications