ADM1173

Preliminary Technical Data FEATURES Allows Safe Board Insertion and Removal from a Live Backplane Controls Supply Voltages from 2.7 V to 16.5V Adjustable Analog Current Limit with Circuit Breaker Fast Response Limits Peak Fault Current Automatic Retry or Latch-Off On Current Fault Adjustable Voltage Slew Rate Control Charge Pumped Gate Drive for External N-FET Switch TIMER pin allows control over timing functions Undervoltage Lockout 8-pin TSOT Package 2.7V to 16.5V Hot Swap Controller with Tracking or Slew Rate Control ADM1173 GENERAL DESCRIPTION The ADM1173 is a Hot Swap controller that allows a board to be safely inserted and removed from a live backplane. An internal charge pumped driver controls the GATE of an external high side N-channel FET for a supply voltage ranging from 2.7V to 16.5V. The ADM1173 provides the initial timing cycle and allows the GATE to be ramped up at an adjustable rate. The Slew rate of the Output is controlled a capacitor or supply on the SLEW pin. The ADM1173 features a fast current limit loop providing active current limiting together with a circuit breaker timer. The signal at the ON pin turns the part on and off and is also used for the reset function. A capacitor connected to the TIMER pin gives the user control over the duty cycle of the PWM retry ratio during current fault. This part is available in two options: the ADM1173-1 will automatic retry for over-current fault and the ADM1173-2 will latch-off for an over-current fault. The ADM117...