Datasheet

LT4256-1/LT4256-2
3
425612fa
t
PHLUV
UV Low to GATE Low 1.7 3 µs
t
PLHUV
UV High to GATE High C
GATE
= 0 6 9 µs
t
PHLFB
FB Low to PWRGD Low 0.8 2 µs
t
PLHFB
FB High to PWRGD High 3.2 5 µs
t
PHLSENSE
(V
CC
– V
SENSE
) High to GATE Low V
CC
– V
SENSE
= 275mV 1 3 µs
ELECTRICAL CHARACTERISTICS
The ● denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
CC
= 48V unless otherwise noted.
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2: An internal clamp limits the GATE pin to a minimum of 10V above
V
CC
. Driving this pin to a voltage beyond the clamp voltage may damage
the part.
TYPICAL PERFOR A CE CHARACTERISTICS
UW
I
CC
vs Temperature
PWRGD Thresholds
vs Temperature
PWRGD Output Voltage
vs I
PWRGD
I
CC
vs V
CC
UV Thresholds vs Temperature
SENSE Pin Regulation Voltage
vs Temperature
TEMPERATURE (°C)
–50
3.5
3.6
UV THRESHOLDS (V)
3.7
3.8
3.9
4.1
–25
02550
4256 G01
75 100
4.0
H-L THRESHOLD
L-H THRESHOLD
TEMPERATURE (°C)
10
SENSE PIN REGULATION VOLTAGE (mV)
15
20
48
58
4256 G02
53
FB = 0V
FB > 2V
–50
–25
0 255075100
V
CC
(V)
10
2.0
2.5
3.5
40 60
4256 G03
1.5
1.0
20 30
50 70 80
0.5
0
3.0
I
CC
(mA)
TEMPERATURE (°C)
0
I
CC
(mA)
0.5
1.0
1.5
2.5
4256 G04
2.0
V
CC
= 48V
–50
–25
0 255075100
TEMPERATURE (°C)
3.9
4.0
PWRGD THRESHOLDS (V)
4.1
4.2
4.3
4.5
4256 G05
4.4
H-L THRESHOLD
L-H THRESHOLD
–50
–25
0 255075100
I
PWRGD
(mA)
0
0
V
PWRGD
(V)
1
2
3
4
6
2
468
4256 G06
10 12
5
Specifications are at T
A
= 25°C unless
otherwise noted.