Datasheet

4
LT1640AL/LT1640AH
Gate Voltage vs Temperature
TEMPERATURE (°C)
12.0
GATE VOLTAGE (V)
13.0
14.0
15.0
12.5
13.5
14.5
–25 0 75
1640A G04
100–50 25 50
V
DD
= 48V
TEMPERATURE (°C)
–50
48
TRIP VOLTAGE (mV)
49
51
52
53
55
250
50
1640A G05
50
54
100
–25
75
TEMPERATURE (°C)
–50
GATE PULL-UP CURRENT (µA)
48
47
46
45
44
43
42
41
40
75
1640A G06
–25 10050250
V
GATE
= 0V
Gate Pull-Up Current
vs Temperature
Gate Pull-Down Current
vs Temperature
TEMPERATURE (°C)
–50
GATE PULL-DOWN CURRENT (mA)
49
52
55
75
1640A G07
46
43
40
–25 0
25
50
100
V
GATE
= 2V
PWRGD Output Low Voltage
vs Temperature (LT1640AL)
TEMPERATURE (°C)
–50
PWRGD OUTPUT LOW VOLTAGE (V)
0.3
0.4
0.5
75
1640A G08
0.2
0.1
0
–25 25
0
50
100
I
OUT
= 1mA
TEMPERATURE (°C)
–50
2
OUTPUT IMPEDANCE (kΩ)
3
4
5
6
7
8
–25 2505075
1640A G09
100
V
DRAIN
– V
EE
> 2.4V
PWRGD Output Impedance
vs Temperature (LT1640AH)
Circuit Breaker Trip Voltage
vs Temperature
When the DRAIN pin of the LT1640AH is above V
EE
by
more than V
PG
, the PWRGD pin will sink current to the
DRAIN pin which pulls the module’s enable pin low,
forcing it off. When V
DRAIN
drops below V
PG
, the PWRGD
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.
PWRGD/PWRGD (Pin 1): Power Good Output Pin. This pin
will toggle when V
DRAIN
is within V
PG
of V
EE
. This pin can
be connected directly to the enable pin of a power module.
When the DRAIN pin of the LT1640AL is above V
EE
by
more than V
PG
, the 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
DRAIN
drops below V
PG
, the PWRGD pin sinks current to V
EE
,
pulling the enable pin low and turning on the module.
UU
U
PI FU CTIO S
TYPICAL PERFOR A CE CHARACTERISTICS
UW