LT1640AH LINER [Linear Technology], LT1640AH Datasheet - Page 4

• Manufacturer Part Number: LT1640AH
• Description: Negative Voltage Hot Swap Controller
• Manufacturer: LINER [Linear Technology]

LT1640AL/LT1640AH
TYPICAL PERFOR A CE CHARACTERISTICS
PI FU CTIO S
PWRGD/PWRGD (Pin 1): Power Good Output Pin. This pin
will toggle when V
be connected directly to the enable pin of a power module.
When the DRAIN pin of the LT1640AL is above V
more than V
allowing the pull-up current of the module’s enable pin to
pull the pin high and turn the module off. When V
drops below V
pulling the enable pin low and turning on the module.
4
15.0
14.5
14.0
13.5
13.0
12.5
12.0
55
52
43
49
46
40
U
– 50
– 50
Gate Voltage vs Temperature
Gate Pull-Down Current
vs Temperature
V
V
DD
GATE
= 48V
– 25
– 25
U
= 2V
PG
TEMPERATURE ( C)
TEMPERATURE ( C)
0
0
, the PWRGD pin will be high impedance,
PG
, the PWRGD pin sinks current to V
DRAIN
25
25
U
is within V
50
50
W
75
75
1640A G04
1640A G07
U
100
100
PG
of V
EE
0.5
0.4
0.3
0.2
0.1
. This pin can
55
54
53
52
51
50
48
49
0
– 50
– 50
PWRGD Output Low Voltage
vs Temperature (LT1640AL)
Circuit Breaker Trip Voltage
vs Temperature
I
OUT
– 25
– 25
= 1mA
DRAIN
EE
EE
by
TEMPERATURE ( C)
TEMPERATURE ( C)
0
0
,
25
25
When the DRAIN pin of the LT1640AH is above V
more than V
DRAIN pin which pulls the module’s enable pin low,
forcing it off. When V
sink current is turned off and a 6.5k resistor is connected
between PWRGD and DRAIN, allowing the module’s pull-
up current to pull the enable pin high and turn on the
module.
50
50
75
75
1640A G08
1640A G05
PG
100
100
, the PWRGD pin will sink current to the
DRAIN
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 (LT1640AH)
V
V
drops below V
GATE
DRAIN
– 25
– 25
= 0V
– V
EE
TEMPERATURE ( C)
TEMPERATURE ( C)
0
0
> 2.4V
25
25
PG
, the PWRGD
50
50
75
75
EE
1640A G06
1640A G09
by
100
100