Datasheet

LT3800
4
3800fc
ELECTRICAL CHARACTERISTICS
Shutdown Threshold (Rising)
vs Temperature
Shutdown Threshold (Falling)
vs Temperature V
CC
vs Temperature
V
CC
vs I
CC(LOAD)
V
CC
vs V
IN
I
CC
Current Limit vs Temperature
Note 1: Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2: This IC includes overtemperature protection that is intended
to protect the device during momentary overload conditions. Junction
temperature will exceed 125°C when overtemperature protection is active.
Continuous operation above the specifi ed maximum operating junction
temperature may impair device reliability.
Note 3: The LT3800E is guaranteed to meet performance specifi cations
from 0°C to 125°C junction temperature. Specifi cations over the –40°C
to 125°C operating junction temperature range are assured by design,
characterization and correlation with statistical process controls. The
TYPICAL PERFORMANCE CHARACTERISTICS
LT3800I is guaranteed over the full –40°C to 125°C operating junction
temperature range.
Note 4: V
IN
voltages below the start-up threshold (7.5V) are only
supported when V
CC
is externally driven above 6.5V.
Note 5: Operating range dictated by MOSFET absolute maximum gate-
source voltage ratings.
Note 6: Supply current specifi cation does not include switch drive
currents. Actual supply currents will be higher.
Note 7: DC measurement of gate drive output “ON” voltage is typically
8.6V. Internal dynamic bootstrap operation yields typical gate “ON”
voltages of 9.8V during standard switching operation. Standard operation
gate “ON” voltage is not tested but guaranteed by design.
TEMPERATURE (°C)
–50 –25
1.37
1.36
1.35
1.34
1.33
100
3800 G01
0 50 12525 75
SHUTDOWN THRESHOLD, RISING (V)
–50 –25 1000 50 12525 75
TEMPERATURE (°C)
1.240
1.235
1.230
1.225
1.220
3800 G02
SHUTDOWN THRESHOLD, FALLING (V)
TEMPERATURE (°C)
–50 –25
V
CC
(V)
8.0
8.1
7.8
7.9
125
3800 G03
0
50
25
75
100
I
CC
= 0mA
I
CC
= 20mA
I
CC(LOAD)
(mA)
0
V
CC
(V)
40
3800 G04
10
20
30
8.05
8.00
7.95
7.90
7.85
51525
35
T
A
= 25°C
V
IN
(V)
4
V
CC
(V)
8
7
6
5
4
3
79 12
3800 G05
56
8
10 11
I
CC
= 20mA
T
A
= 25°C
–50 –25 1000 50 12525 75
TEMPERATURE (°C)
200
175
150
125
100
75
50
3800 G06
I
CC
CURRENT LIMIT (mA)