LTC1982 Linear Technology, LTC1982 Datasheet - Page 4

• Manufacturer Part Number: LTC1982
• Description: (LTC1981 / LTC1982) Single and Dual Micropower High Side Switch Controllers
• Manufacturer: Linear Technology

PIN
LTC1981/LTC1982
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
less.
TYPICAL PERFOR A CE CHARACTERISTICS
4
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400
350
300
250
200
150
100
100
U
0.1
50
10
0
1
1.5
0
GATE Drive Current (LTC1981)
Turn-On Time (LTC1982)
FUNCTIONS
2.0
V
1
CC
V
U
GS
2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0
V
= 1.8V
GATE DRIVE VOLTAGE (V)
CC
2
= 2V
SUPPLY VOLTAGE (V)
= 2.7V
3
V
4
U
CC
V
CC
= 5V
5
C
T
= 3.3V
A
GATE
= 25 C
W
V
6
= 1000pF
GS
= 1V
1981/82 G09
7
1982 G06
CC
U
or 7.25V, whichever is
8
300
250
200
150
100
50
40
35
30
25
20
15
10
0
5
0
1.5
1.5
Turn-On Time (LTC1981)
Turn-Off Time (LTC1982)
V
GS
2.0
2.0
= 2V
2.5
2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0
SUPPLY VOLTAGE (V)
SUPPLY VOLTAGE (V)
3.0
3.5 4.0
C
T
TIME FOR V
V
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.
GATE
A
CC
= 25 C
= 1000pF
4.5 5.0 5.5
C
T
(Pin 5): Input Supply Voltage. Range from 1.8V to
GATE
A
= 25 C
GATE
V
= 1000pF
GS
1981/82 G10
< 0.1V
= 1V
1982 G07
6.0
7.50
7.45
7.40
7.35
7.30
7.25
7.20
7.15
7.10
7.05
7.00
20
15
10
25
0
5
– 60
1.5
Turn-Off Time (LTC1981)
GATE Drive Voltage vs
Temperature
V
CC
2.0
– 40
= 3.3V
2.5
– 20
SUPPLY VOLTAGE (V)
TEMPERATURE ( C)
3.0
0
3.5 4.0
20
C
T
TIME FOR V
GATE
A
= 25 C
40
4.5 5.0 5.5
=1000pF
60
GATE
1981/82 G11
80
1982 G08
< 0.1
100
6.0