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MAX4273ESE Datasheet(PDF) 11 Page - Maxim Integrated Products |
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MAX4273ESE Datasheet(HTML) 11 Page - Maxim Integrated Products |
11 / 26 page Unlike other circuit breaker ICs, the MAX4271/ MAX4272/MAX4273 regulate the current to a preset level instead of completely turning off the external N-FET if an overcurrent condition occurs during startup. In startup mode, the gate drive current is limited to 100µA and decreases with the increase of the gate voltage (see Gate Charge Current vs. Gate Voltage in the Typical Operating Characteristics). This allows the controller to slowly enhance the MOSFET. If the fast comparator detects an overcurrent, the gate voltage is momentarily discharged with a fixed 70µA current until the load current through the sense resistor (RSENSE) decreases below its threshold point. This effectively regulates the inrush current during startup. Figure 3 shows the startup waveforms. STAT goes high at the end of the startup period if no fault condition is present. Normal Operation (DualSpeed/BiLevel) In normal operation (after the startup timer has expired), protection is provided by turning off the exter- nal MOSFET when a fault condition is encountered. DualSpeed/BiLevel fault protection incorporates two comparators with different thresholds and response times to monitor the current: 1) Slow comparator. This comparator has an externally set response time (from 20µs to seconds) and a fixed 50mV threshold voltage. The slow comparator ignores low-amplitude momentary current glitches. After an extended overcurrent condition, a fault is generated and the MOSFET gate is slowly dis- charged. 2) Fast comparator. This comparator has a fixed 350ns response time and a 200mV threshold voltage (adjustable from 50mV to 750mV in MAX4273). The fast comparator turns off the MOSFET immediately after it detects a large amplitude event such as a short circuit. 3V to 12V Current-Limiting Hot-Swap Controllers with Autoretry, DualSpeed/BiLevel Fault Protection ______________________________________________________________________________________ 11 Figure 1. MAX4271/MAX4272 Functional Diagram MAX4271 MAX4272 6μA SLOW COMPARATOR FAST COMPARATOR 6μA 2.45V CSPD CSPD INPUT UVLO LOGIC CONTROL DISCHARGE ENABLE VIN STAT GND CTIM CTIM 4μA 0.1V 0.6V ON RSENSE N M1 GATE SENSE IN GATE OVLO ON COMPARATOR GATE DRIVE VSC,TH 50mV VSC,TH 200mV 150ms DELAY ON VIN RISING VOUT VIN CHARGE PUMP (1MHz) |
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