LTC1981/LTC1982
ELECTRICAL CHARACTERISTICS
(LTC1981 only)
The ● denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VCC = 5V unless otherwise specified. CGATE 1 = CGATE 2 = CGATE = 1000pF.
SYMBOL PARAMETER
CONDITIONS
= 100µA, V = 1.8V
MIN
TYP
MAX
UNITS
V
OL
GDR Output Voltage Low
I
●
0.05
0.4
V
SINK
CC
GATE Drive Ready Trip Point
GATE Voltage Rising
V
CC
V
CC
V
CC
V
CC
= 1.8V
= 2.7V
= 3.3V
= 5V
●
●
●
●
3.85
5.78
6.17
6.17
4.05
6.08
6.5
4.25
6.38
6.82
6.82
V
V
V
V
6.5
GDR Hysteresis
GDR Delay
GATE Voltage Falling
2
2
%
After GATE is Above the GDR Trip Threshold
µs
10k Pull-Up to V
CC
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2: All voltage values are with respect to GND.
Note 3: the LTC1982E is guaranteed to meet performance specifications
from 0°C to 70°C. Specifications over the –40°C to 85°C operating
temperature range are assured by design, characterization and correlation
with statistical process controls.
Note 4: Guaranteed by design not subject to test.
U W
TYPICAL PERFOR A CE CHARACTERISTICS
GATE Drive Voltage vs Supply
GATE Drive Current (LTC1982)
Supply Current vs Supply Voltage
Voltage
100
10
1
25
20
8.0
7.5
7.0
6.5
6.0
5.5
5.0
4.5
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
V
= 3.3V
= 2.7V
CC
T
A
= 25°C
T
= 25°C
A
V
CC
= 5V
V
CC
GATE DRIVE VOLTAGE
V
= 1.8V
(V COMMON SOURCE)
CC
GS
LTC1981 OR
BOTH CHANNELS ON
LTC1982
15
10
5
EITHER CHANNEL ON
LTC1982
GATE DRIVE –V
GS
CC
(V SOURCE FOLLOWER)
T
A
= 25°C
0.1
0
0
1
2
3
4
5
6
7
8
1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5
SUPPLY VOLTAGE (V)
3.0 3.5
1.5 2.0 2.5
4.0 4.5 5.0 5.5
GATE DRIVE VOLTAGE (V)
SUPPLY VOLTAGE, V (V)
CC
1982 G03
1982 G02
1982 G01
ISUPPLY
ISUPPLY
300
60
T
= 25°C
T
A
= 25°C
A
V
= 5V
V
CC
= 3V
CC
250
200
150
100
50
50
40
30
20
10
0
SHDN1 TIED
TO SHDN2
SHDN1 TIED
TO SHDN2
0
0
1
2
0
1
2
SHDN LOGIC INPUT VOLTAGE (V)
SHDN LOGIC INPUT VOLTAGE (V)
1981/82 G04
1981/82 G05
3