Maxim MAX5977A 1V-16V热插拔控制方案
Maxim公司的MAX5977A/MAX5977B是1V-16V单电源热插拔控制器,能对系统提供最完整的保护.电流检测放大器输出精度1%,热插拔监视电压1V-16V,并具有电路中断器功能,主要用在通用热插拔,网络交换和路由器,服务器以及存储系统.本文介绍了MAX5977A/MAX5977B主要特性,方框图以及典型应用电路.
The MAX5977A/MAX5977B hot-swap controllers provide complete protection for systems with a 1V to 16V single-supply voltage.
During the initial insertion, the hot-swap controllers limit the inrush current from damaging the board or from shorting out the backplane. When the input voltage is above the undervoltage threshold and below the overvoltage threshold, a 5µA current source powered from the internal 5V charge pump drives the gate of an external n-channel MOSFET providing a slow turn-on response. An internal current-sense amplifier in the IC monitors the current across an external shunt resistor providing current sensing for wide input-sense voltage range. The devices provide two levels of overcurrent circuit-breaker protections: a fast-trip threshold for a fast turn-off and a lower slow-trip threshold for a delayed turn-off.
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