4

LTC1155

CC

HARA TERISTICS

A

TYPICALPERFOR

CE

Turn ON Time

Turn OFF Time

Short-Circuit Turn OFF Delay Time

SUPPLY VOLTAGE (V)

0

0

600

700

800

900

1000

510

20

1155 G07

100

200

300

400

500

15

SUPPLY VOLTAGE (V)

0

0

30

35

40

45

50

510

20

1155 G08

5

10

15

20

25

15

SUPPLY VOLTAGE (V)

0

0

30

35

40

45

50

510

20

1155 G09

5

10

15

20

25

15

NO EXTERNAL DELAY

Standby Supply Current

Supply Current Per Side (ON)

Input ON Threshold

TEMPERATURE (

°C)

–50

0

5

10

25

35

40

50

– 25

0

25

50

1155 G10

15

20

30

45

75

100

125

TEMPERATURE (

°C)

–50

0

100

200

500

700

800

1000

–25

0

25

50

1155 G11

300

400

600

900

75

100

125

TEMPERATURE (

°C)

–50

0.4

0.6

0.8

1.4

1.8

2.0

2.4

– 25

0

25

50

1155 G12

1.0

1.2

1.6

2.2

75

100

125

Input Pin

The LTC1155 logic input is a high impedance CMOS gate

and should be grounded when not in use. These input pins

have ESD protection diodes to ground and supply and,

therefore, should not be forced beyond the power supply

rails.

Gate Drive Pin

The gate drive pin is either driven to ground when the

switch is turned OFF or driven above the supply rail when

the switch is turned ON. This pin is a relatively high

impedance when driven above the rail (the equivalent of a

few hundred k

Ω). Care should be taken to minimize any

loading of this pin by parasitic resistance to ground or

supply.

Supply Pin

The supply pin of the LTC1155 serves two vital purposes.

The first is obvious: it powers the input, gate drive,

regulation and protection circuitry. The second purpose is

less obvious: it provides a Kelvin connection to the top of

the two drain sense resistors for the internal 100mV

reference. The supply pin should be connected directly to

the power supply source as close as possible to the top of

the two sense resistors.