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LTC4352 Datasheet(PDF) 8 Page - Linear Technology |
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LTC4352 Datasheet(HTML) 8 Page - Linear Technology |
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8 / 24 page  LTC4236 8 4236f For more information www.linear.com/LTC4236 pin FuncTions CPO1, CPO2: Charge Pump Output. Connect a capacitor from CPO1 or CPO2 to the corresponding IN1 or D2SRC pin. The value of this capacitor is approximately 10× the gate capacitance (CISS) of the external MOSFET for ideal diode control. The charge stored on this capacitor is used to pull up the ideal diode MOSFET gate during a fast turn-on. Leave this pin open if fast ideal diode turn- on is not needed. CS+: Positive Current Sense Input for Current Sense Am- plifier. Connect this pin to the input of the current sense resistor.ThevoltagebetweenCS+andSENSE–istranslated to a ground referenced signal at IMON pin. DGATE1, DGATE2: Ideal Diode MOSFET Gate Drive Out- put. Connect this pin to the gate of an external N-channel MOSFET for ideal diode control. An internal clamp limits the gate voltage to 12V above and a diode voltage below IN1 or D2SRC. During fast turn-on, a 1.5A pull-up charges DGATE from CPO. During fast turn-off, a 1.5A pull-down discharges DGATE1 to IN1 and DGATE2 to D2SRC. D2OFF: Control Input. A rising edge above 1.235V turns off the external ideal diode MOSFET in the IN2 supply path and a falling edge below 1.215V allows the MOSFET to be turned on. Connect this pin to an external resistive divider fromIN1tomakeIN1thehigherpriorityinputsupplywhen IN1 and IN2 are equal. D2SRC: Ideal Diode MOSFET Gate Drive Return. Connect this pin to the source of the external N-channel MOSFET switch in the IN2 power path. The gate fast pull-down cur- rent returns through this pin when DGATE2 is discharged. DSTAT1: Diode MOSFET Status Output. Open drain out- put that pulls low when the MOSFET gate drive voltage between DGATE1 and IN1 exceeds 0.7V indicating that the MOSFET diode path is on. Otherwise it goes high imped- ance. It requires an external pull-up resistor to a positive supply. Leave open if unused. DSTAT2: Diode MOSFET Status Output. Open drain out- put that pulls low when the MOSFET gate drive voltage between DGATE2 and D2SRC exceeds 0.7V indicating that the MOSFET diode path is on. Otherwise it goes high impedance. It requires an external pull-up resistor to a positive supply. Leave open if unused. DTMR: Debounce Timer Capacitor Terminal. Connect this pin to either INTVCC for fixed 100ms delay or an external capacitor to ground for adjustable start-up delay (123ms/µF) when EN toggles low. EN: Enable Input. Ground this pin to enable Hot Swap control. If this pin is pulled high, the Hot Swap MOSFET is not allowed to turn on. A 10µA current source pulls this pin up to a diode below INTVCC. Upon EN going low when ON is high, there is a start-up delay for debounce as con- figured at the DTMR pin, after which the fault is cleared. FAULT: Overcurrent Fault Status Output. Output that pulls low when the fault timer expires during an overcurrent fault. Otherwise it is pulled high by a 10µA current source to a diode below INTVCC. It may be pulled above INTVCC using an external pull-up. Leave open if unused. FB: Foldback and Power Good Comparator Input. Connect this pin to an external resistive divider from OUT. If the voltage falls below 1.215V, the PWRGD pin pulls high to indicate the power is bad. If the voltage falls below 0.9V, the output power is considered bad and the current limit is reduced. Tie to INTVCC to disable foldback. FTMR:FaultTimerCapacitorTerminal.Connectacapacitor between this pin and ground to set a 12ms/µF duration for current limit before the external Hot Swap MOSFET is turned off. The duration of the off time is 8s/µF, resulting in a 0.15% duty cycle. GND: Device Ground. |
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