LT1641-1/LT1641-2
AC ELECTRICAL CHARACTERISTICS
SYMBOL
t
PHLON
t
PLHON
t
PHLFB
t
PLHFB
t
PHLSENSE
PARAMETER
ON Low to GATE Low
ON High to GATE High
FB Low to PWRGD Low
FB High to PWRGD High
(V
CC
– SENSE) High to GATE Low
CONDITIONS
Figures 1, 2
Figures 1, 2
Figures 1, 3
Figures 1, 3
Figures 1, 4
T
A
= 25°C, V
CC
= 24V
MIN
TYP
6
1.7
3.2
1.5
0.5
1
2
MAX
UNITS
µs
µs
µs
µs
µs
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:
All currents into device pins are positive; all currents out of device
pins are negative. All voltages are referenced to ground unless otherwise
specified.
TYPICAL PERFOR A CE CHARACTERISTICS
I
CC
vs V
CC
3.5
3.0
2.5
I
CC
(mA)
2.0
1.5
1.0
0.5
0
0
20
40
60
V
CC
(V)
80
100
1641-1 G01
85°C
25°C
–45°C
I
CC
(mA)
48V
2.5
24V
2.0
1.5
1.0
0.5
0
–50
FB PIN LOW VOLTAGE THRESHOLD (V)
FB Pin High Voltage Threshold vs
Temperature
1.335
0.100
V
CC
= 48V
FB PIN HYSTERESIS (V)
FB PIN HIGH VOLTAGE THRESHOLD (V)
1.330
1.325
1.320
1.315
1.310
1.305
1.300
1.295
1.290
1.285
1.280
–50
0.080
0.075
0.070
0.065
0.060
0.055
0.050
0.045
0.040
–50
I
GATE
PULL UP (µA)
–25
0
25
50
TEMPERATURE (°C)
U W
75
1641-1 G04
I
CC
vs Temperature
3.0
1.250
1.245
1.240
1.235
1.230
1.225
1.220
1.215
1.210
1.205
FB Pin Low Voltage Threshold vs
Temperature
V
CC
= 48V
–25
0
25
50
TEMPERATURE (°C)
75
100
1.200
–50
–25
0
25
50
TEMPERATURE (°C)
75
100
1641-1 G02
1641-1 G03
FB Pin Hysteresis vs Temperature
–5
V
CC
= 48V
–6
–7
–8
–9
–10
–11
–12
–25
0
25
50
TEMPERATURE (°C)
75
100
0.095
0.090
0.085
I
GATE
Pull Up vs Temperature
V
CC
= 48V
100
–13
–50
–25
0
25
50
TEMPERATURE (°C)
75
100
1641-1 G05
1641-1 G06
164112fc
3
LINER [ LINEAR TECHNOLOGY ]
