LT4250L/LT4250H
3
4250lhfa
ELECTRICAL CHARACTERISTICS
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
DC
V
DD
Supply Voltage Operating Range
l
18 80 V
I
DD
Supply Current UV = 3V, OV = V
EE
, SENSE = V
EE
l
1.6 5 mA
V
UVL
Undervoltage Lockout 15.4 V
V
CL
Current Limit Trip Voltage V
CL
= (V
SENSE
– V
EE
)
l
40 50 60 mV
I
PU
GATE Pin Pull-Up Current Gate Drive On, V
GATE
= V
EE
l
–30 –45 –60 μA
I
PD
GATE Pin Pull-Down Current Gate Drive OFF 24 50 70 mA
I
SENSE
SENSE Pin Current V
SENSE
= 50mV –20 μA
ΔV
GATE
External Gate Drive (V
GATE
– V
EE
), 18V ≤ V
DD
≤ 80V
l
10 13.5 18 V
V
UVH
UV Pin High Threshold Voltage UV Increasing
l
1.24 1.255 1.27 V
V
UVL
UV Pin Low Threshold Voltage UV Decreasing
l
1.105 1.125 1.145 V
V
UVHY
UV Pin Hysteresis 130 mV
I
INUV
UV Pin Input Current V
UV
= V
EE
l
–0.02 –0.5 μA
V
OVH
OV Pin High Threshold Voltage OV Increasing
l
1.235 1.255 1.275 V
V
OVL
OV Pin Low Threshold Voltage OV Decreasing
l
1.21 1.235 1.255 V
V
OVHY
OV Pin Hysteresis 20 mV
I
INOV
OV Pin Input Current V
OV
= V
EE
l
–0.03 –0.5 μA
V
DL
DRAIN Low Threshold V
DRAIN
– V
EE
, DRAIN Decreasing 1.1 1.6 2.3 V
V
GH
GATE High Threshold ΔV
GATE
– V
GATE
Decreasing 1.3 V
I
DRAIN
Drain Input Bias Current V
DRAIN
= 48V
l
10 80 500 μA
V
OL
PWRGD Output Low Voltage PWRGD (LT4250L), (V
DRAIN
– V
EE
) < V
DL
I
OUT
= 1mA
I
OUT
= 5mA
l
l
0.48
1.2
0.8
3
V
V
PWRGD Output Low Voltage
(PWRGD – DRAIN)
PWRGD (LT4250H), V
DRAIN
= 5V
I
OUT
= 1mA
l
0.75
1V
I
OH
Output Leakage PWRGD (LT4250L), V
DRAIN
= 48V, V
PWRGD
= 80V
PWRGD (LT4250H), V
DRAIN
= 0V, V
PWRGD
= 80V
l
l
0.05
0.05
10
10
μA
μA
AC
t
PHLOV
OV High to GATE Low Figures 1a, 2 1.7 μs
t
PHLUV
UV Low to GATE Low Figures 1a, 3 1.5 μs
t
PLHOV
OV Low to GATE High Figures 1a, 2 5.5 μs
t
PLHUV
UV High to GATE High Figures 1a, 3 6.5 μs
t
PHLSENSE
SENSE High to Gate Low Figures 1a, 4a 1 3 μs
t
PHLCB
Current Limit to GATE Low Figures 1b, 4b 500 μs
t
PHLDL
DRAIN Low to PWRGD Low
DRAIN Low to (PWRGD – DRAIN) High
(LT4250L) Figures 1a, 5a
(LT4250H) Figures 1a, 5a
1
1
μs
μs
t
PHLGH
GATE High to PWRGD Low
GATE High to (PWRGD – DRAIN) High
(LT4250L) Figures 1a, 5b
(LT4250H) Figures 1a, 5b
1.5
1.5
μs
μs
The l denotes the specifi cations which apply over the full operating
temperature range, otherwise specifi cations are at T
A
= 25°C. (Note 2), V
DD
= 48V, V
EE
= 0V unless otherwise noted.
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 V
EE
unless otherwise
specifi ed.
