4

LT1640L/LT1640H

1640lhfb

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

0

75

1640 G04

100

–50

25

50

TEMPERATURE (

°C)

–50

48

49

51

52

53

55

25

0

50

1640 G05

50

54

100

–25

75

TEMPERATURE (

°C)

–50

48

47

46

45

44

43

42

41

40

75

1640 G06

– 25

100

50

25

0

Gate Pull-Up Current

vs Temperature

Gate Pull-Down Current

vs Temperature

TEMPERATURE (

°C)

–50

49

52

55

75

1640 G07

46

43

40

–25

0

25

50

100

PWRGD Output Low Voltage

vs Temperature (LT1640L)

TEMPERATURE (

°C)

–50

0.3

0.4

0.5

75

1640 G08

0.2

0.1

0

–25

25

0

50

100

TEMPERATURE (

°C)

–50

2

3

4

5

6

7

8

–25

25

050

75

1640 G09

100

PWRGD Output Impedance

vs Temperature (LT1640H)

Circuit Breaker Trip Voltage

vs Temperature

pin which pulls the module’s enable pin low, forcing it off.

is turned off and a 6.5k resistor is connected between

PWRGD and DRAIN, allowing the module’s pull-up cur-

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

OV (Pin 2): Analog Overvoltage Input. When OV is pulled

above the 1.223V low to high threshold, an overvoltage

condition is detected and the GATE pin will be immediately

pulled low. The GATE pin will remain low until OV drops

below the 1.203V high to low threshold.

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

be connected directly to the enable pin of a power module.

the pull-up current of the module’s enable pin to pull the

the enable pin low and turning on the module.