3

4251b12f

LTC4251B/LTC4251B-1/

LTC4251B-2

Note 1: Stresses beyond those listed under Absolute Maximum Ratings

may cause permanent damage to the device. Exposure to any Absolute

Maximum Rating condition for extended periods may affect device

reliability and lifetime.

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

Gate Low Threshold

(Before Gate Ramp-Up)

0.5

V

UV Threshold High

LTC4251B/LTC4251B-2

LTC4251B-1

l

l

3.075

2.300

3.225

2.420

3.375

2.540

V

V

UV Threshold Low

LTC4251B/LTC4251B-2

LTC4251B-1

l

l

2.775

2.050

2.925

2.160

3.075

2.270

V

V

UV Hysteresis

LTC4251B/LTC4251B-2

LTC4251B-1

0.30

0.26

V

V

OV Threshold High

LTC4251B

LTC4251B-1

l

l

5.85

5.86

6.15

6.17

6.45

6.48

V

V

OV Threshold Low

LTC4251B

LTC4251B-1

l

l

5.25

5.61

5.55

5.91

5.85

6.21

V

V

OV Hysteresis

LTC4251B

LTC4251B-1

0.60

0.26

V

V

SENSE Input Current

l

–30

–15

μA

UV/OV Input Current

UV/OV = 4V

l

±0.1

±1

μA

Timer Voltage High Threshold

4V

Timer Voltage Low Threshold

1V

Timer Current

5.8

28

230

5.8

μA

mA

μA

μA

UV Low to GATE Low

0.7

μs

OV High to GATE Low

LTC4251B/LTC4251B-1

1

μs

02

4

6

8

10 12 14 16 18 20 22

1000

100

10

1

0.1

4251b12 G02

UV/OV = 4V refers to UV = 4V for the LTC4251B-2.

Note 2: All currents into device pins are positive; all currents out of device

specified.

Note 3: UV/OV = 4V refers to UV = 4V for the LTC4251B-2.

TYPICAL PERFORMANCE CHARACTERISTICS

TEMPERATURE (°C)

–55

2000

1800

1600

1400

1200

1000

800

600

400

200

0

–15

25

45

125

4251b12 G01

–35

5

65

85 105

TEMPERATURE (°C)

–55

10

9

8

7

6

5

4

3

2

–15

25

45

125

4251b12 G03

–35

5

65

85 105