LTC1155C Linear Technology, LTC1155C Datasheet - Page 4

• Manufacturer Part Number: LTC1155C
• Description: Dual High Side Micropower MOSFET Driver
• Manufacturer: Linear Technology

LTC1155
TYPICAL PERFOR
PIN
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
4
1000
900
800
700
600
500
400
300
200
100
50
45
40
35
30
25
20
15
10
U
0
5
0
–50
0
Turn ON Time
Standby Supply Current
C
V
FUNCTIONS
GATE
V
GS
S
– 25
= 2V
= 5V
= 1000pF
U
5
SUPPLY VOLTAGE (V)
0
TEMPERATURE ( C)
V
S
V
= 18V
GS
25
= 5V
10
U
50
75
15
W
100
A
1155 G07
1155 G10
U
125
20
CE
C
1000
HARA TERISTICS
900
800
700
600
500
400
300
200
100
50
45
40
35
30
25
20
15
10
5
0
0
– 50
0
Turn OFF Time
Supply Current Per Side (ON)
C
TIME FOR V
V
GATE
S
–25
= 5V
= 100pF
C
5
SUPPLY VOLTAGE (V)
0
GATE
TEMPERATURE ( C)
< 1V
V
25
S
= 12V
few hundred k ). 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.
10
50
75
15
100
1155 G11
1155 G08
125
20
2.4
2.2
2.0
1.8
1.6
1.4
1.2
1.0
0.8
0.6
0.4
50
45
40
35
30
25
20
15
10
5
0
–50
0
Input ON Threshold
Short-Circuit Turn OFF Delay Time
C
TIME FOR V
GATE
– 25
= 1000pF
5
SUPPLY VOLTAGE (V)
0
TEMPERATURE ( C)
GATE
NO EXTERNAL DELAY
< 1V
25
V
V
S
S
V
= 5V
= 18V
10
SEN
50
= V
S
–1V
75
15
100
1155 G09
1155 G12
125
20