3

LT1640L/LT1640H

1640lhfb

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

Power Good Threshold

1.1

1.4

2.0

V

Power Good Threshold Hysteresis

0.4

V

Drain Input Bias Current

q

10

50

500

µA

PWRGD Output Low Voltage

q

0.48

0.8

V

1.50

3.0

V

PWRGD Output Low Voltage

(PWRGD – DRAIN)

q

0.75

1.0

V

Output Leakage

q

0.05

10

µA

Power Good Output Impedance

q

2

6.5

k

Ω

(PWRGD to DRAIN)

AC

OV High to GATE Low

Figures 1, 2

1.7

µs

UV Low to GATE Low

Figures 1, 3

1.5

µs

OV Low to GATE High

Figures 1, 2

5.5

µs

UV High to GATE High

Figures 1, 3

6.5

µs

Figures 1, 4

2

3

4

µs

DRAIN Low to PWRGD Low

(LT1640L) Figures 1, 5

0.5

µs

DRAIN Low to (PWRGD – DRAIN) High

(LT1640H) Figures 1, 5

0.5

µs

DRAIN High to PWRGD High

(LT1640L) Figures 1, 5

0.5

µs

DRAIN High to (PWRGD – DRAIN) Low

(LT1640H) Figures 1, 5

0.5

µs

Note 1: Absolute Maximum Ratings are those values beyond which the life

of a device may be impaired.

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

specified.

TYPICAL PERFOR A CE CHARACTERISTICS

SUPPLY VOLTAGE (V)

0

1.3

1.4

1.5

60

100

1640 G01

1.2

1.1

0

20

40

80

1.6

1.7

1.8

Supply Current vs Supply Voltage

TEMPERATURE (

°C)

–50

– 25

1.0

1.1

1.2

1.3

1.4

1.6

025

50

75

1640 G02

100

1.5

Supply Current vs Temperature

SUPPLY VOLTAGE (V)

0

6

7

9

10

11

40

80

100

15

1640 G03

8

20

60

12

13

14

Gate Voltage vs Supply Voltage