LTC4359 datasheet(5/20 Pages) LINER

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LTC4359

Rev D

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PIN FUNCTIONS

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

left open or connected to VSS.

GATE: Gate Drive Output. The GATE pin pulls high, enhanc-

ing the N-channel MOSFET when the load current creates

more than 30mV of voltage drop across the MOSFET.

When the load current is small, the gate is actively driven

to maintain 30mV across the MOSFET. If reverse current

flows, a fast pull-down circuit connects the GATE to the

SOURCE pin within 0.3μs, turning off the MOSFET.

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.

NC(MS8andS8Packages): NoConnection.Notinternally

connected.

OUT: Drain Voltage Sense. OUT is the cathode of the ideal

diode and the common output when multiple LTC4359s

are configured as an ideal diode-OR. It connects either di-

rectly or through a 2k resistor to the drain of the N-channel

MOSFET. The voltage sensed at this pin is used to control

the MOSFET gate.

SHDN: Shutdown Control Input. The LTC4359 can be

shut down to a low current mode by pulling the SHDN

pin below 0.6V. Pulling this pin above 2V or disconnect-

ing it allows an internal 2.6μA current source to turn the

part on. Maintain board leakage to less than 100nA for

proper operation. The SHDN pin can be pulled up to 100V

or down to –40V with respect to VSS without damage. If

the shutdown feature is not used, connect SHDN to IN.

SOURCE: 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.

VSS: Supply Voltage Return and Device Ground.

TYPICAL PERFORMANCE CHARACTERISTICS

Gate Turn-Off Time

vs Initial Overdrive

Gate Turn-Off Time

vs Final Overdrive

Load Current

vs Forward Voltage Drop

VINITIAL (V)

150

200

4359 G10

100

0.5

0.25

0.75

VIN = 12V

∆VSD = VINITIAL –1V

VFINAL (V)

1500

–1

4359 G11

1000

500

–0.5

–0.25

–0.75

VIN = 12V

∆VSD = 45mV VFINAL

∆VSD (mV)

100

4359 G12

FDMS86101

FDB3632

FDS3732

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