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LTC4221IGN Datasheet(PDF) 9 Page - Linear Technology |
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LTC4221IGN Datasheet(HTML) 9 Page - Linear Technology |
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9 / 28 page  9 LTC4221 4221f PI FU CTIO S FAULT (Pin 7): Fault Status Input/Output. FAULT is a bidirectional pin. As an input, pulsing VFAULT < 0.816V will set the FAULT latch and bring the LTC4221 into the fault state. As an output, FAULT is pulled high by an internal 3.8µA pull-up under normal operating conditions. When an overcurrent fault is detected by a SENSE pin or a overvoltage fault detected by an FB pin, the FAULT latch is set and the LTC4221 goes into the fault state. The FAULT latch is reset by a UVLO or the ON1 pin being driven below 0.4V. FILTER (Pin 8): Overcurrent Fault Timing Filter. The FILTER pin requires an external capacitor to ground to adjust the response time of the two slow comparators. The FILTER pin can be left unconnected for a default slow comparator response time of 15µs. TIMER (Pin 9): Analog System Timer. The TIMER pin requires an external capacitor to ground to generate timing delay cycles during start-up. The LTC4221’s initial and start-up timing cycles are controlled by CTIMERand the internal current sources connected to the TIMER pin. GND (Pin 10): Ground. Connect to a ground plane for optimum performance. PWRGD2 (Pin 11): Channel 2 Power Good Output. Similar functionality as PWRGD1. Controlled by FB2. FB2 (Pin 12): VOUT2 Feedback Input. Similar functionality as FB1. Monitors channel 2 output voltage, controls PWRGD2 output and channel 2 start-up current limit. GATE2 (Pin 13): Channel 2 Gate Drive. Similar functional- ity as GATE1. Controls the gate drive of the channel 2 external N-channel MOSFET. ON2 controls GATE2 in the same manner as ON1 controls GATE1. VON1 < 0.4V over- rides conditions at ON2 and GATE2 is held low by a 100µA current source. UVLO, overvoltage, overcurrent and exter- nally generated faults override conditions at ON1 and ON2, and pull GATE2 low. SENSE2 (Pin 14): Channel 2 Current Sense Input. Similar functionality as SENSE1. Monitors channel 2 load current through RSENSE2 placed in the supply path between VCC2 and SENSE2. To disable the current limit and circuit breaker function for channel 2, tie SENSE2 to VCC2. VCC2 (Pin 15): Channel 2 Positive Supply Input. VCC2 can range from 1V to 13.5V for normal operation but it must be ≤VCC1. An undervoltage lockout circuit disables both channels whenever the voltage at VCC2 is less than 0.8V. ON2 (Pin 16): Channel 2 On Input. GATE2 is pulled to ground by a 100µA current source when VON2 < 0.821V. When VON2 > 0.851V, GATE2 ramps up after an initial timing cycle. |
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