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LT4363
elecTrical characTerisTics
temperature range, otherwise specifications are at T
SYMBOL
PARAMETER
I
FB Input Current
FB
ΔV
Current Limit Sense Voltage
SNS
ΔV
= (SNS – OUT)
SNS
Current Limit Foldback
I
SNS Input Current
SNS
I
TMR Pull-up Current, Overvoltage
TMR
TMR Pull-up Current, OV Warning
TMR Pull-up Current, Overcurrent
TMR Pull-up Current, Cool Down
TMR Pin Pull-down Current, Cool Down
V
TMR Fault Threshold
TMR(F)
V
TMR Gate Off Threshold
TMR(G)
V
TMR Restart Threshold
TMR(R)
Early Warning Window
ΔV
TMR
V
TMR Cool Down High Threshold
TMR(H)
V
UV Input Threshold
UV
V
UV Input Hysteresis
UV(HYST)
V
OV Input Threshold
OV
V
OV Input Hysteresis
OV(HYST)
I
UV, OV Input Current
IN
I
FLT, ENOUT Leakage Current
LEAK
V
FLT, ENOUT Output Low
OL
ΔV
OUT High Threshold
OUT(TH)
ΔV
OUT Reset Threshold
OUT(RST)
I
OUT Input Current
OUT
V
SHDN Threshold
SHDN
V
SHDN Open Voltage
SHDN(Z)
I
SHDN Current
SHDN
t
SHDN Reset Time
RESET
D
Retry Duty Cycle; Overvoltage
Retry Duty Cycle; Output Short
t
Undervoltage Turn Off Propagation Delay UV Steps from 1.5V to 1V
OFF(UV)
t
Overvoltage Turn Off Propagation Delay
OFF(OV)
t
Overcurrent Turn Off Propagation Delay
OFF(OC)
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.
4
The
denotes the specifications which apply over the full operating
l
= 25°C. V
= 12V, unless otherwise noted.
A
CC
CONDITIONS
V
= 1.275V
FB
V
= 12V, OUT = 3V to 12V
CC
V
= 48V, OUT = 3V to 48V
CC
V
= 12V, OUT = 0V to 1V
CC
V
= 48V, OUT = 0V to 1V
CC
OUT = SNS = 3V to 80V
OUT = SNS = 0V
TMR = 1V, FB = 1.5V, ΔV
= 0.5V
DS
TMR = 1V, FB = 1.5V, ΔV
= 75V
DS
TMR = 1.325V, FB = 1.5V, ΔV
= 0.5V
DS
TMR = 1V, ΔV
= 100mV, ΔV
SNS
DS
TMR = 1V, ΔV
= 100mV, ΔV
SNS
DS
TMR = 3V, FB = 1.5V, ΔV
= 0V, ΔV
SNS
V
= 3V, FB = 1.5V, ΔV
= 0V, ΔV
TMR
SNS
TMR Rising
TMR Rising
TMR Falling, LT4363-2
V
– V
TMR(G)
TMR(F)
V
= 7V to 80V, TMR Rising
CC
UV Rising
OV Rising
UV = 1.275V
UV = –60V
FLT, ENOUT = 80V
I
= 0.1mA
SINK
I
= 2mA
SINK
ΔV
= V
– V
, ENOUT From Low to High
OUT
CC
OUT
ENOUT From High to Low
V
= OUT = 12V, SHDN Open
CC
V
= OUT = 12V, SHDN = 0V
CC
V
= 4V to 80V
CC
V
= 4V to 80V
CC
SHDN = 0.4V
SHDN ≤ 0.4V; LT4363-1
V
= 80V, OUT = 16V, FB = 1.5V; LT4363-2
CC
V
= 12V, OUT = 0V, ∆V
= 100mV; LT4363-2
CC
SNS
FB Steps from 0V to 1.5V; OUT = 0V
∆V
Steps from 0V to 150mV; OUT = 0V
SNS
Note 2: All currents into device pins are positive, all currents out of device pins
are negative. All voltages are referenced to GND unless otherwise specified.
Note 3: An internal clamp limits the GATE pin to a minimum of 10V above
the OUT pin. Driving this pin to voltages beyond the clamp may damage
the device.
For more information
www.linear.com/LT4363
MIN
l
45
l
48
l
15
l
16
l
l
l
–1.7
l
–42
l
–3
l
= 0.5V
–5
l
= 80V
–190
l
–1
= 0V
l
DS
= 0V
l
DS
1.235
l
1.335
l
0.47
l
80
l
3.5
l
1.24
l
1.24
l
l
l
l
l
l
0.25
l
1.8
l
l
l
0.6
0.4
l
l
–1
l
l
l
l
l
l
l
TYP
MAX
UNITS
±0.2
±1
µA
50
55
mV
53
58
mV
25
35
mV
27
36
mV
20
40
µA
–10
–15
µA
–4
–6
µA
–50
–58
µA
–5
–7
µA
–9
–13
µA
–250
–310
µA
–2.3
–3.5
µA
1
2
4
µA
1.275
1.31
V
1.375
1.41
V
0.5
0.53
V
100
120
mV
4.3
5.4
V
1.275
1.31
V
12
mV
1.275
1.31
V
7.5
mV
±0.2
±1
µA
–1
–2
mA
±0.5
±2.5
µA
300
800
mV
2
9
V
0.5
0.75
V
2.7
3.6
V
0.25
0.5
mA
0.25
1
mA
1.4
1.7
V
2.1
V
2.2
V
–4
–8
µA
100
µs
1
2
%
0.76
1
%
2
5
µs
0.25
1
µs
1
2.5
µs
4363fb
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