Datasheet

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