LTC4372/LTC4373

7

Rev. 0

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PIN FUNCTIONS

Exposed Pad (DD Package Only) : Exposed pad may be

left open or connected to device ground.

GATE: MOSFET Gate Drive Output. The LTC4372/LTC4373

control the gate of the MOSFET to maintain the voltage

drop between 0mV to 30mV using a pulsed control

method. If reverse current flows, a fast pull-down cir-

cuit connects GATE to SOURCE within 0.5μs, turning off

the MOSFET.

GND: Device Ground.

IN: Voltage Sense and Supply Voltage. IN is the anode of

the ideal diode. The voltage sensed at this pin is used to

control the MOSFET gate for forward voltage regulation

and reverse current turn-off. The positive supply input

ranges from 2.5V to 80V for normal operation. It can go

below GND by up to 28V during a reverse battery condi-

tion without damaging the part.

a 0.1μF or larger capacitor to this pin. An external load of

less than 10µA can be connected at this pin.

OUT: MOSFET Drain Voltage Sense. OUT is the cathode

of the ideal diode and the common output when multiple

LTC4372/LTC4373’s are configured as an ideal diode-OR.

It connects to the drain of the N-channel MOSFET. The

voltage sensed at this pin is used to control the MOSFET

gate for forward voltage regulation and reverse current

turn-off. OUT is used as the supply to hold the MOSFET

off when IN is not available (below UVLO). Connect a 10µF

or larger capacitor to this pin.

SHDN (LTC4372): Shutdown Control Input. The LTC4372

can be shut down to a low current mode by pulling SHDN

above 1.215V. Connect to GND if unused.

SOURCE: MOSFET Source Connection. SOURCE is the

return path of the GATE fast pull-down. Connect this

pin as close as possible to the source of the external

N-channel MOSFET.

2UPU (LTC4372): 2μA Pull-Up Output. This pin has a

facilitate on/off control of the LTC4372 by a microcontrol-

ler’s open-drain output. If unused, leave open or connect

UVOUT (LTC4373): UV Status Output. Open Drain output

high impedance when UV exceeds 1.191V. UVOUT can be

used to adjust hysteresis for the UV monitor. This pin may

be left open or connected to GND if unused.

UV (LTC4373): Undervoltage Detection Input. The

LTC4373 goes into a low current shutdown mode when