LT4351CMS datasheet(6/20 Pages) LINER

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LT4351

sn4351 4351fs

PI FU CTIO S

OV (Pin 6): Overvoltage Shutdown Pin. This pin is used

for input overvoltage detection. It is connected to a

resistive divider from VIN. When the voltage exceeds the

OV threshold (0.3V), GATE is pulled to GND disabling

power transfer. In addition, the FAULT pin pulls low

indicating a fault. Overvoltage detection has filtering on it

to prevent false triggering. The filtering depends on the

level of overdrive. Filtered tripping will occur when OV

exceeds 0.3V. If OV exceeds 0.33V, the gate immediately

turns off (no filtering). If overvoltage detection is not

required, ground the OV pin. See Applications Informa-

tion for further information.

UV (Pin 7): Undervoltage Shutdown Pin. This pin is used

for the undervoltage detect function. It is connected to a

resistive divider from VIN. When the voltage is below the

UV threshold, GATE pulls to GND disabling power transfer.

In addition, the FAULT pin pulls low indicating a fault. When

the UV pin voltage drops below the threshold, a 10

µAcurrent

is pulled from the divider to provide hysteresis. If under-

voltage detection is not required, tie the UV pin to a voltage

greater than 320mV and not greater than VIN. Do not force

more than 9V on UV due to an internal clamp. See Appli-

cations Information for further information.

FAULT (Pin 8): Fault Comparator Status Pin. This pin pulls

low when a fault occurs. A fault has occured if the UV pin

is below threshold or the OV pin is above threshold. The

FAULT pin low indicates that there is a problem with the

VIN (source) supply. GATE is pulled to GND during a fault,

disabling the MOSFET(s) and prohibits common supply

contamination. If the GATE pin goes to compliance (GATE

equals the lesser of VDD – 2.3V or OUT + 7.4V) and VIN is

greater than OUT by more than 0.21V, FAULT turns on as

an indicator that the MOSFETs are probably not function-

ing. Leave this pin open if not used.

STATUS (Pin 9): MOSFET Status Pin. This pin pulls low

when GATE is above VIN by more than 0.7V and VIN is

greater than OUT by 15mV. This indicates the MOSFET is

on. Leave this pin open if not used.

OUT (Pin 10): Common Supply Pin. This pin is connected

to the supply common and is used in conjunction with VIN

as one input controlling the MOSFET(s).

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