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LTC4352IDD-TRPBF Datasheet(PDF) 5 Page - Linear Technology |
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LTC4352IDD-TRPBF Datasheet(HTML) 5 Page - Linear Technology |
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5 / 16 page  LTC4352 5 4352f PIN FUNCTIONS VIN (Pin 1): Voltage Sense and Supply Input. Connect this pin to the power input side of the MOSFET. The low voltage supply VCC is generated from VIN. The voltage sensed at this pin is used to control the MOSFET gate. VCC (Pin 2): Low Voltage Supply. Connect a 0.1μF capacitor from this pin to ground. When VIN ≥ 2.9V, this pin provides decoupling for an internal regulator that generates a 4.1V supply. For applications where VIN < 2.9V, connect an ex- ternal supply voltage in the range 2.9V to 6V to this pin. UV (Pin 3): Undervoltage Comparator Input. Connect this pin to an external resistive divider from VIN. If the volt- age at this pin falls below 0.5V, an undervoltage fault is detected and the MOSFET is turned off. The comparator has a built-in hysteresis of 5mV. Tie to VCC if unused. OV (Pin 4): Overvoltage Comparator Input. Connect this pin to an external resistive divider from VIN. If the volt- age at this pin rises above 0.5V, an overvoltage fault is detected and the MOSFET is turned off. The comparator has a built-in hysteresis of 5mV. Tie to GND if unused. STATUS (Pin 5): MOSFET Status Output. This pin is pulled low by an open-drain output when the external MOSFET is on. An internal 10μA current source pulls this pin up to a diode below VCC. It may be pulled above VCC using an external pull-up. Tie to GND or leave open if unused. FAULT (Pin 6): Fault Output. This pin is pulled low by an open-drain output when a fault occurs. This fault could either be an undervoltage fault, an overvoltage fault, or an open MOSFET fault. An internal 10μA current source pulls this pin up to a diode below VCC. It may be pulled above VCC using an external pull-up. Tie to GND or leave open if unused. REV (Pin 7): Reverse Current Enable Input. Connect this pin to GND for normal diode operation that blocks reverse current. Driving this pin above 1V fully turns on the MOSFET gate to allow reverse current. An internal 10μA current source pulls this pin to GND. OUT (Pin 8): Output Voltage Sense Input. Connect this pin to the output side of the MOSFET. The voltage sensed at this pin is used to control the MOSFET gate. GND (Pin 9): Device Ground. CPO (Pin 10): Charge Pump Output. Connect a capacitor from this pin to the SOURCE pin. The value of this capaci- tor is approximately 10x the gate capacitance (CISS) of the MOSFET switch. The charge stored on this capacitor is used to pull-up the gate during a fast turn-on. Leave this pin open if fast turn-on is not needed. GATE (Pin 11): MOSFET Gate Drive Output. Connect this pin to the gate of the external N-channel MOSFET switch. An internal clamp limits the gate voltage to 6.1V above, and a diode below SOURCE. During fast turn-on a 1.5A pull-up charges GATE to CPO. During fast turn-off a 1.5A pull-down discharges GATE to SOURCE. SOURCE (Pin 12): MOSFET Gate Drive Return. Connect this pin to the source of the external N-channel MOSFET switch. EXPOSED PAD (Pin 13, DD Package Only): Exposed Pad may be left open or connected to device ground. |
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