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LTC4252-2 Datasheet(PDF) 7 Page - Linear Technology |
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LTC4252-2 Datasheet(HTML) 7 Page - Linear Technology |
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7 / 24 page  LTC4223-1/LTC4223-2 7 422312f PIN FUNCTIONS 12VSENSE (Pin 1): 12V Current Sense Input. Connect this pin to the output of the current sense resistor. The electronic circuit breaker trips if the voltage across the sense resistor exceeds 50mV for more than a fault filter delay. 12VIN (Pin 2): 12V Supply Input. Undervoltage lockout disables the 12V supply until the input at 12VIN exceeds 9.7V. 12IMON (Pin 3): 12V Current Sense Monitoring Output. This pin monitors the sense voltage between 12VIN and 12VSENSE. The gain ratio between this pin’s voltage and the sense voltage is 33. 12ON (Pin 4): 12V Supply On Control Digital Input. A ris- ing edge turns on the external N-channel MOSFET if ⎯E⎯N is pulled low and a falling edge turns it off. A high-to-low transition on this pin will clear the 12V supply faults. AUXIN (Pin 5): Auxiliary Supply Input. An internal 0.3Ω switch is connected between AUXIN and AUXOUT pins. Undervoltage lockout holds the switch off until the input at AUXIN exceeds 2.5V. VCC (Pin 6): Bias Supply Input. This pin provides power to the device’s internal circuitry and operates from 2.7V to 6V. Undervoltage lockout circuit disables the device until the input at VCC exceeds 2.45V. Bypass with 330nF. AUXON (Pin 7): Auxiliary Supply On Control Digital Input. A rising edge turns on the internal switch if ⎯E⎯N is pulled low and a falling edge turns it off. A high-to-low transi- tion on both this pin and 12ON pin will clear the auxiliary supply faults. GND (Pin 8): Device Ground. TIMER (Pin 9): Timer Capacitor Terminal. Connect a capacitor between this pin and ground to set a 741ms/μF duration for initial timing cycle, 123ms/μF for AUX current limit during power-up and 6ms/μF duration for 12V current limit before the external MOSFET is turned off. ⎯E⎯N (Pin 10): Enable Input Intended for Card Presence Detect. Ground this pin to enable the external N-channel MOSFET and internal switch to turn on. If this pin is pulled high, the switches are not allowed to turn on. An internal 100k resistor pulls up this pin. A high-to-low transition will clear faults. ⎯A⎯U⎯X⎯P⎯G⎯O⎯O⎯D (Pin 11): Auxiliary Supply Power Status Output. Open drain output that is normally pulled high by an internal 10μA current source or an external pull-up resistor to VCC. It pulls low when the AUXOUT pin voltage exceeds the power-good threshold of 2.901V. AUXOUT (Pin 12): Auxiliary Supply Output. This pin is the output from the internal switch connected between AUXIN and AUXOUT pins. It signals ⎯A⎯U⎯X⎯P⎯G⎯O⎯O⎯D low when it exceeds 2.901V. A 750Ω active pull-down discharges AUXOUT to ground when the internal switch is turned off. ⎯F⎯A⎯U⎯L⎯T (Pin 13): Auxiliary and 12V Supply Fault Status Output. Open drain output that is normally pulled high by an internal 10μA current source or an external pull-up resistor to VCC. It pulls low when the circuit breaker is tripped due to an overcurrent fault on auxiliary or 12V supply. ⎯1⎯2⎯P⎯G⎯O⎯O⎯D (Pin 14): 12V Supply Power Status Output. Open drain output that is normally pulled high by an in- ternal 10μA current source or an external pull-up resistor to VCC. It pulls low when the 12VOUT pin voltage exceeds the power-good threshold of 10.36V. 12VOUT (Pin 15): 12V Gate Drive Return and Power-Good Input. Connect this pin to the source of the external N- channel MOSFET for gate drive return. This pin signals ⎯1⎯2⎯P⎯G⎯O⎯O⎯D low when it exceeds 10.36V. When the external MOSFET is turned off, 12VOUT is discharged to ground through a 800Ω active pull-down. 12VGATE (Pin 16): Gate Drive for 12V Supply External N- Channel MOSFET. An internal 10μA current source charges the gate of the external N-channel MOSFET. An internal clamp limits the gate voltage to 6.2V above 12VOUT. A resistor and capacitor network from this pin to ground sets the turn-on rate and compensates the active current limit. During turn-off, a 1mA pull-down current discharges 12VGATE to ground. During short circuit or undervoltage lockout, a 160mA pull-down current between 12VGATE and 12VOUT is activated. Exposed Pad (Pin 17, DHD Package): Exposed pad may be left open or connected to device ground. |
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