Linear LT8645S 65V 8A降压转换器解决方案

Linear公司的LT8645S是 65V 8A降压转换器,静态电流只有2.5μA,在任何的PCB上都有超低的EMI/EMC,而在高开关频率提供高的效率.1MHz 12VIN/5VOUT时的效率高达95%,2MHz 12VIN/5VOUT时的效率高达94%,输入电压3.4V-65V,主要用在汽车和工业电源,通用降压转换器和GSM电源.本文介绍了LT8645S主要特性,功能框图和多种应用电路图,以及演示板DC2468A主要特性,电路图和材料清单.
The LT®8645S synchronous step-down regulator featuressecond generation Silent Switcher architecture designedto minimize EMI/EMC emissions while delivering high efficiencyat high switching frequencies. This includes theintegration of bypass capacitors to optimize all the fastcurrent loops inside and make it easy to achieve advertisedEMI performance by eliminating layout sensitivity. Thisperformance makes the LT8645S ideal for noise sensitiveapplications 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 mode control with a 40ns minimum on-time allows high stepdown ratios even at high switching frequencies.
Burst Mode operation enables ultralow standby currentconsumption, pulse-skipping mode allows full switchingfrequency at lower output loads, or spread spectrum operation can further reduce EMI/EMC emissions. Soft-startand tracking functionality is accessed via the TR/SS pin,and an accurate input voltage UVLO threshold can be setusing the EN/UV pin. A CLKOUT pin enables synchronizingother regulators to the LT8645S.
LT8645S主要特性:
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
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
2.5μ...