LTC4352CMS-PBF datasheet(5/16 Pages) LINER

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LTC4352

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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