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LTC4245CUHF Datasheet(PDF) 9 Page - Linear Technology |
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LTC4245CUHF Datasheet(HTML) 9 Page - Linear Technology |
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9 / 36 page  LTC4245 9 4245fa PI FU CTIO S 12VGATE: Gate Drive for 12V Supply External N-Channel MOSFET. An internal 20μA current source charges the gate of the external N-channel MOSFET. An internal clamp limits the gate voltage to 6.2V above 12VOUT. During turn-off a 1.3mA pull-down current discharges 12VGATE to ground. During short-circuit a 250mA pull-down current between 12VGATE and 12VOUT is activated. 12VIN: 12V Supply, Current Sense and ADC Input. The internal low voltage supply VCC is generated from 12VIN. An undervoltage lockout circuit, with 38mV hysteresis, prevents any external MOSFET from turning on when this pin is below 10.5V. 12VOUT: 12V Gate Drive Return; Foldback, ADC and Power Bad Input. Connect this pin to the source of the 12V supply external N-channel MOSFET switch for gate drive return. Power is considered bad if this pin drops below 11.1V. The comparator on this pin has a built-in hysteresis of 40mV. This pin is also an input to the ADC and the current limit foldback circuit. A 1000Ω active pull-down discharges 12VOUT to ground when the external MOSFET is turned off. 12VSENSE: 12V Supply Current Sense and ADC Input. Connect this pin to the output of the 12V current sense resistor. The current limit circuit controls the 12VGATE pin to limit the sense voltage between the 12VIN and 12VSENSE pins to 50mV or less during start-up and 150mV thereafter. During start-up a foldback feature reduces the current limit to 15mV as the 12VOUT pin approaches ground. A circuit breaker, enabled after start-up, trips when the sense voltage exceeds 50mV for 22μs. To disable current limit, connect this pin to 12VIN. 3VGATE: Gate Drive for 3.3V Supply External N-Channel MOSFET. An internal 20μA current source charges the gate of the external N-channel MOSFET. An internal clamp limits the gate voltage to 6.2V above 3VOUT. During turn-off a 1.3mA pull-down current discharges 3VGATE to ground. During short-circuit a 310mA pull-down current between 3VGATE and 3VOUT is activated. 3VIN: 3.3V Supply, Current Sense and ADC Input. The 1V precharge circuit draws its power and reference voltage from 3VIN. An undervoltage lockout circuit, with 10mV hysteresis, prevents any external MOSFET from turning on when this pin is below 2.8V. 3VOUT: 3.3V Gate Drive Return; Foldback, ADC and Power Bad Input. Connect this pin to the source of the 3.3V supply external N-channel MOSFET switch for gate drive return. Power is considered bad if this pin drops below 2.9V. The comparator on this pin has a built-in hysteresis of 11mV. This pin is also an input to the ADC and the current limit foldback circuit. A 190Ω active pull-down discharges 3VOUT to ground when the external MOSFET is turned off. 3VSENSE: 3.3V Supply Current Sense and ADC Input. Connect this pin to the output of the 3.3V current sense resistor. The current limit circuit controls the 3VGATE pin to limit the sense voltage between the 3VIN and 3VSENSE pins to 25mV or less during start-up and 75mV thereafter. During start-up a foldback feature reduces the current limit to 7.5mV as the 3VOUT pin approaches ground. A circuit breaker, enabled after start-up, trips when the sense voltage exceeds 25mV for 22μs. To disable current limit, connect this pin to 3VIN. 5VGATE: Gate Drive for 5V Supply External N-Channel MOS- FET. An internal 20μA current source charges the gate of the external N-channel MOSFET. An internal clamp limits the gate voltage to 6.2V above 5VOUT. During turn-off a 1.3mA pull-down current discharges 5VGATE to ground. During short-circuit a 250mA pull-down current between 5VGATE and 5VOUT is activated. 5VIN: 5V Supply, Current Sense and ADC Input. An under- voltage lockout circuit, with 16mV or 10mV of hysteresis, prevents any external MOSFET from turning on when this pin is below 4.38V or 2.8V depending on the state of the CFG pin. |
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