Datasheet

LTC1981/LTC1982
4
TYPICAL PERFOR A CE CHARACTERISTICS
UW
SUPPLY VOLTAGE (V)
2.0
TURN-ON TIME (µs)
1982 G06
1.5 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0
400
350
300
250
200
150
100
50
0
C
GATE
= 1000pF
T
A
= 25°C
V
GS
= 2V
V
GS
= 1V
SUPPLY VOLTAGE (V)
2.0
TURN-OFF TIME (µs)
1982 G07
1.5 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0
40
35
30
25
20
15
10
5
0
C
GATE
= 1000pF
T
A
= 25°C
TIME FOR V
GATE
< 0.1V
TEMPERATURE (°C)
–60
GATE DRIVE VOLTAGE (V)
7.50
7.45
7.40
7.35
7.30
7.25
7.20
7.15
7.10
7.05
7.00
–20
20
40
1982 G08
–40 0
60
80
100
V
CC
= 3.3V
Turn-Off Time (LTC1982)Turn-On Time (LTC1982)
GATE Drive Voltage vs
Temperature
Turn-On Time (LTC1981)GATE Drive Current (LTC1981) Turn-Off Time (LTC1981)
GATE DRIVE VOLTAGE (V)
01
100
10
1
0.1
2345678
GATE DRIVE CURRENT (µA)
1981/82 G09
V
CC
= 2.7V
V
CC
= 1.8V
V
CC
= 5V
V
CC
= 3.3V
SUPPLY VOLTAGE (V)
1.5
TURN-ON TIME (µs)
2.5
3.5
4.0 6.0
1981/82 G10
2.0 3.0
4.5
5.0
5.5
300
250
200
150
100
50
0
C
GATE
= 1000pF
T
A
= 25°C
V
GS
= 2V
V
GS
= 1V
SUPPLY VOLTAGE (V)
1.5
0
TURN-OFF TIME (µs)
5
15
20
25
2.5
3.5
4.0 6.0
1981/82 G11
10
2.0 3.0
4.5
5.0
5.5
C
GATE
=1000pF
T
A
= 25°C
TIME FOR V
GATE
< 0.1
PIN FUNCTIONS
UUU
LTC1981:
GDR (Pin 1): Gate Drive Ready Active High Open Drain
Output. Used to indicate when the gate drive output is
greater than 90% of its final value.
GND (Pin 2): Ground.
SHDN (Pin 3): SHDN Active Low Input. Used to shut down
the part and force the GATE output pin to ground.
GATE (Pin 4): Gate Drive Output to an External High Side
Switch. Fully enhanced by internal charge pump. Con-
trolled by the SHDN input pin. Output voltage on this pin
will be approximately 2.5 times V
CC
or 7.25V, whichever is
less.
V
CC
(Pin 5): Input Supply Voltage. Range from 1.8V to
5.5V.
LTC1982:
SHDN 1 (Pin 1): SHDN 1 Active Low Input. Used to shut
down the GATE 1 charge pump and force the GATE 1
output pin to ground.
GND (Pin 2): Ground.
SHDN 2 (Pin 3): SHDN 2 Active Low Input. Used to shut
down the GATE 2 charge pump and force the GATE 2
output pin to ground.