LT3592
ELECTRICAL CHARACTERISTICS
PARAMETER
Minimum Input Voltage
Input Quiescent Current
- in Shutdown
CAP to OUT Voltage
Not Switching
V
SHDN
= 0.3V
0.4Ω CAP to OUT
BRIGHT = 1.4V
BRIGHT = 0.3V
R
T
= 357k
R
T
= 140k
R
T
= 48.7k
R
T
= 140k
l
l
The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
IN
= 12V, V
BOOST
= 16V, V
OUT
= 4V unless otherwise noted. (Note 2)
CONDITIONS
l
MIN
TYP
3.25
2
0.1
MAX
3.6
3
2
210
22
–1.2
450
1000
2.5
UNITS
V
mA
μA
mV
mV
A
kHz
kHz
MHz
%
V
190
18
–0.8
350
800
1.9
90
2.3
200
20
–1
400
900
2.2
94
DA Pin Current to Stop OSC
Switching Frequency
Maximum Duty Cycle
SHDN
Input High Voltage
SHDN
Input Low Voltage
BRIGHT Input High Voltage
BRIGHT Input Low Voltage
Switch Current Limit (Note 4)
Switch V
CESAT
Boost Pin Current
Switch Leakage Current
Minimum Boost Voltage
Boost Diode Forward Voltage
V
FB
Voltage
0.3
1.4
0.3
l
V
V
V
A
mV
mA
μA
V
mV
V
0.85
1.25
300
20
1
1.8
800
1.5
30
10
2.5
1.235
I
SW
= 500mA
I
SW
= 500mA
V
OUT
= 4V
I
DIO
= 50mA
OUT = CAP = 4V
l
1.185
1.21
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:
The LT3592E is guaranteed to meet performance specifications
from 0°C to 125°C junction temperature. Specifications over the –40°C
to 125°C operating junction temperature range are assured by design,
characterization and correlation with statistical process controls. The
LT3592I is guaranteed over the full –40°C to 125°C operating junction
temperature range. The operating lifetime is derated at junction
temperatures greater than 125°C.
Note 3:
This IC includes overtemperature protection that is intended
to protect the device during momentary overload conditions. Junction
temperature will exceed the maximum operating junction temperature
when overtemperature protection is active. Continuous operation above
the specified maximum operating junction temperature may result in
device degradation or failure.
Note 4:
Switch Current Measurements are performed when the outputs
are not switching. Slope compensation reduces current limit at higher duty
cycles.
3592fa
3
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