DC1205A Datasheet, PDF (3/24 Pages) Linear Integrated Systems – 500mA Wide Input Voltage Range Step-Down LED Driver with 10:1 Dimming

LT3592
ELECTRICAL CHARACTERISTICS 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)
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
Minimum Input Voltage
l
3.25
3.6
V
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
2
3
mA
0.1
2
μA
l 190
200
210
mV
l 18
20
22
mV
DA Pin Current to Stop OSC
–0.8
–1
–1.2
A
Switching Frequency
Maximum Duty Cycle
SHDN Input High Voltage
SHDN Input Low Voltage
R_T = 357k
R_T = 140k
R_T = 48.7k
R_T = 140k
350
400
450
kHz
800 900 1000
kHz
1.9
2.2
2.5
MHz
90
94
%
2.3
V
0.3
V
BRIGHT Input High Voltage
1.4
V
BRIGHT Input Low Voltage
0.3
V
Switch Current Limit (Note 4)
l 0.85 1.25
1.5
A
Switch V_CESAT
Boost Pin Current
Switch Leakage Current
I_SW = 500mA
I_SW = 500mA
300
mV
20
30
mA
1
10
μA
Minimum Boost Voltage (V_BOOST – V_IN)
V_OUT = 4V
1.8
2.5
V
Boost Diode Forward Voltage
V_FB Voltage
V_FB Input Leakage Current
I_DIO = 50mA
OUT = CAP = 4V, Bright = 12V
V_FB = 1.21V
800
mV
l 1.185 1.21 1.235
V
l –250
250
nA
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.
3592fc
3