ADI LTC7818三路输出同步DC/DC开关稳压器控制方案
ADI公司的LTC7818是一款高性能三路输出(降压/降压/升压)同步DC/DC开关稳压器控制器,可驱动全部N通道功率MOSFET级,可在4.5 V至40V的宽输入电源电压范围内工作,其恒频电流模式架构允许高达3 MHz的锁相开关频率.极低的空载静态电流可延长电池供电系统的工作运行时间,通过OPTI-LOOP补偿功能，可在宽输出电容和ESR值范围内优化瞬态响应.LTC7818具有一个用于降压的精确0.8V基准电压源,一个用于升压的1.2V基准电压源,和一个电源正常输出指示器.它还具有扩频运行模式,可显著降低输入和输出电源的峰值辐射和传导噪声,能够轻松满足电磁干扰(EMI)标准要求.主要应用在汽车和运输,工业和军事/航空电子.本文介绍了LTC7818主要特性,功能框图和多种应用电路,以及演示板DC2855A主要特性和指标,电路图,材料清单和PCB设计图.
The LTC.7818 is a high performance triple output (buck/buck/boost) synchronous DC/DC switching regulator controllerthat drives all N-channel power MOSFET stages.
Its constant-frequency current mode architecture allowsa phase-lockable switching frequency of up to 3MHz.The LTC7818 operates from a wide 4.5V to 40V inputsupply range. When biased from the output of the boostconverter or another auxiliary supply, the LTC7818 canoperate from an input supply as low as 1V after start-up.
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