LT4250H LINER [Linear Technology], LT4250H Datasheet - Page 4

• Manufacturer Part Number: LT4250H
• Description: Negative 48V Hot Swap Controller
• Manufacturer: LINER [Linear Technology]

PIN
LT4250L/LT4250H
TYPICAL PERFOR A CE CHARACTERISTICS
PWRGD/PWRGD (Pin 1): Power Good Output Pin. This pin
will latch a power good indication when V
of V
connected directly to the enable pin of a power module.
When the DRAIN pin of the LT4250L is above V
than V
PWRGD pin will be high impedance, allowing the pull-up
current of the module’s enable pin to pull the pin high and
turn the module off. When V
V
V
4
GATE
EE
15.0
14.5
14.0
13.5
13.0
12.5
12.0
55
52
43
U
49
46
40
, pulling the enable pin low and turning on the module.
EE
– 50
– 50
Gate Voltage vs Temperature
Gate Pull-Down Current
vs Temperature
and V
rises above V
FUNCTIONS
DL
V
V
DD
GATE
– 25
– 25
= 48V
or V
U
= 2V
GATE
TEMPERATURE ( C)
TEMPERATURE ( C)
GATE
0
0
is within V
25
25
is more than V
GH
U
, the PWRGD pin sinks current to
50
50
W
GH
DRAIN
75
75
of V
1640 G04
1640 G07
U
100
100
GH
drops below V
GATE
from V
DRAIN
. This pin can be
0.5
0.4
0.3
0.2
0.1
55
54
53
52
51
50
48
49
0
is within V
– 50
– 50
PWRGD Output Low Voltage
vs Temperature (LT4250L)
Current Limit Trip Voltage
vs Temperature
EE
GATE
I
OUT
by more
– 25
– 25
DL
= 1mA
, the
and
DL
TEMPERATURE ( C)
TEMPERATURE ( C)
0
0
25
25
This condition is latched until the GATE pin is turned off via
the UV, OV, UVLO or the electronic circuit breaker.
When the DRAIN pin of the LT4250H is above V
than V
PWRGD pin will sink current to the DRAIN pin which pulls
the module’s enable pin low, forcing it off. When V
drops below V
sink current is turned off, allowing the module’s pull-up
current to pull the enable pin high and turn on the module.
This condition is latched until the GATE pin is turned off via
the UV, OV, UVLO or the electronic circuit breaker.
50
50
DL
75
75
or V
1640 G08
1640 G05
100
100
DL
GATE
and V
is more than V
GATE
48
47
46
45
44
43
42
41
40
8
7
6
5
4
3
2
– 50
– 50
Gate Pull-Up Current
vs Temperature
PWRGD Output Impedance
vs Temperature (LT4250H)
V
rises above V
V
GATE
DRAIN
– 25
– 25
= 0V
– V
TEMPERATURE ( C)
TEMPERATURE ( C)
EE
GH
0
0
> 2.4V
from V
25
25
GH
, the PWRGD
50
50
EE
GATE
by more
75
75
DRAIN
1640 G09
, the
1640 G06
4250lhf
100
100