LT1640 Linear Technology, LT1640 Datasheet - Page 4

• Manufacturer Part Number: LT1640
• Description: Negative Voltage Hot Swap Controller
• Manufacturer: Linear Technology

PIN
LT1640L/LT1640H
TYPICAL PERFOR A CE CHARACTERISTICS
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 LT1640L is above V
than V
the pull-up current of the module’s enable pin to pull the
pin high and turn the module off. When V
below V
the enable pin low and turning on the module.
When the DRAIN pin of the LT1640H is above V
than V
4
15.0
14.5
14.0
13.5
13.0
12.5
12.0
55
52
43
U
49
46
40
– 50
– 50
Gate Voltage vs Temperature
Gate Pull-Down Current
vs Temperature
PG
PG
FUNCTIONS
PG
, the PWRGD pin will be high impedance, allowing
– 25
, the PWRGD pin will sink current to the DRAIN
– 25
, the PWRGD pin sinks current to V
U
TEMPERATURE ( C)
TEMPERATURE ( C)
0
0
DRAIN
25
25
U
is within V
50
50
W
75
75
1640 G04
1640 G07
U
100
100
PG
of V
EE
0.5
0.4
0.1
. This pin can
0.3
0.2
55
54
53
52
51
50
48
49
DRAIN
0
– 50
– 50
PWRGD Output Low Voltage
vs Temperature (LT1640L)
Circuit Breaker Trip Voltage
vs Temperature
EE
EE
EE
, pulling
by more
by more
– 25
– 25
drops
TEMPERATURE ( C)
TEMPERATURE ( C)
0
0
25
25
pin which pulls the module’s enable pin low, forcing it off.
When V
is turned off and a 5k resistor is connected between
PWRGD and DRAIN, allowing the module’s pull-up cur-
rent to pull the enable pin high and turn on the module.
OV (Pin 2): Analog Overvoltage Input. When OV is pulled
above the 1.223V low to high threshold, an overvoltage
condition is detected and the GATE pin will be immediately
pulled low. The GATE pin will remain low until OV drops
below the 1.203V high to low threshold.
50
50
DRAIN
75
75
1640 G05
1640 G08
drops below V
100
100
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 (LT1640H)
PG
– 25
– 25
, the PWRGD sink current
TEMPERATURE ( C)
TEMPERATURE ( C)
0
0
25
25
50
50
75
75
1640 G09
1640 G06
100
100