HV311

HV311 Hot Swap Controller Features ► 10 to 90V operation, positive or negative supply ► UV/OV lock out & power-on-reset ► Circuit breaker ► 100ms startup timer ► Automatic retry or latched operation ► Low Power, 400µA sleep mode ► Active low power good ► 8-Lead SOIC package General Description The Supertex HV311 Hot Swap Controller provides inrush current limiting and other power supply support functions for hot swap equipment. Current limiting is provided by control of an external MOSFET which is placed in the return line of the power supply connection. Placement in the return allows use of an N-channel MOSFET without the need for high side driving. An internal clamp at the GATE pin activates when full bias for the HV311 is not available, thus keeping the MOSFET in the off-state during the initial insertion phase. As soon as adequate bias is available for the main control circuits, the UV (undervoltage) and OV (overvoltage) pins check for normal operating voltage o...