LT4250LIN8 datasheet(4/12 Pages) LINER

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LT4250L/LT4250H

4250lhf

TYPICAL PERFOR A CE CHARACTERISTICS

Gate Voltage vs Temperature

TEMPERATURE (

°C)

12.0

13.0

14.0

15.0

12.5

13.5

14.5

–25

1640 G04

100

–50

VDD = 48V

TEMPERATURE (

°C)

–50

1640 G05

100

–25

TEMPERATURE (

°C)

–50

1640 G06

– 25

100

VGATE = 0V

Gate Pull-Up Current

vs Temperature

Gate Pull-Down Current

vs Temperature

TEMPERATURE (

°C)

–50

1640 G07

–25

100

VGATE = 2V

PWRGD Output Low Voltage

vs Temperature (LT4250L)

TEMPERATURE (

°C)

–50

0.3

0.4

0.5

1640 G08

0.2

0.1

–25

100

IOUT = 1mA

TEMPERATURE (

°C)

–50

–25

050

1640 G09

100

VDRAIN – VEE > 2.4V

PWRGD Output Impedance

vs Temperature (LT4250H)

Current Limit Trip Voltage

vs Temperature

This condition is latched until the GATE pin is turned off via

the UV, OV, UVLO or the electronic circuit breaker.

When the DRAIN pin of the LT4250H is above VEE by more

than VDL or VGATE is more than VGH from ∆VGATE, the

PWRGD pin will sink current to the DRAIN pin which pulls

the module’s enable pin low, forcing it off. When VDRAIN

drops below VDL and VGATE rises above VGH, the PWRGD

sink current is turned off, allowing the module’s pull-up

current to pull the enable pin high and turn on the module.

This condition is latched until the GATE pin is turned off via

the UV, OV, UVLO or the electronic circuit breaker.

PIN FUNCTIONS

PWRGD/PWRGD (Pin 1): Power Good Output Pin. This pin

will latch a power good indication when VDRAINiswithinVDL

of VEE and VGATE is within VGH of ∆VGATE. This pin can be

connected directly to the enable pin of a power module.

When the DRAIN pin of the LT4250L is above VEE by more

than VDL or VGATE is more than VGH from ∆VGATE, the

PWRGD pin will be high impedance, allowing the pull-up

current of the module’s enable pin to pull the pin high and

turn the module off. When VDRAIN drops below VDL and

VGATE rises above VGH, the PWRGD pin sinks current to

VEE, pulling the enable pin low and turning on the module.

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