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LT3474/LT3474-1
ELECTRICAL CHARACTERISTICS The l denotes the speci?cations which apply over the full operating
temperature range, otherwise speci?cations are at T A = 25°C. V IN = 12V, V BOOST = 16V, V O UT = 4V unless otherwise noted (Note 3).
PARAMETER
Reference Voltage Line Regulation
Reference Voltage Load Regulation
V ADJ Pin Bias Current (Note 4)
CONDITIONS
5V < V IN < 36V
0 < I REF < 250μA
l
MIN
TYP
0.01
0.0002
20
MAX
400
UNITS
%/V
%/μA
nA
Switching Frequency
Maximum Duty Cycle
R T = 80.6k
R T = 80.6k
l
l
470
450
90
500
95
530
540
kHz
kHz
%
R T = 10k
R T = 232k
76
98
%
%
Foldback Frequency
R T = 80.6k, V OUT = 0V
70
kHz
SHDN Threshold (to Switch)
2.6
2.65
2.7
V
SHDN Pin Current (Note 5)
PWM Threshold
V SHDN = SHDN Threshold
8.3
0.4
10.3
0.9
12.3
1.2
μA
V
V C Switching Threshold
0.8
V
V C Source Current
V C Sink Current
LED to V C Current Gain
LED to V C Transresistance
V C to Switch Current Gain
V C Clamp Voltage
V C = 1V
V C = 1V
100
100
1.5
1
2
1.9
μA
μA
μA/mA
V/mA
A/V
V
V C Pin Current in PWM Mode
OUT Pin Clamp Voltage (LT3474)
OUT Pin Current in PWM Mode
V C = 1V, V PWM = 0.3V
V OUT = 4V, V PWM = 0.3V
l
l
13.2
0.01
13.8
0.1
1
14.5
10
μA
V
μA
Switch Current Limit (Note 6)
–40°C to 85°C
l
1.6
2.1
3.2
A
LT3474I, LT3474I-1 at 125°C
1.5
3.2
A
Switch V CESAT
Boost Pin Current
Switch Leakage Current
Minimum Boost Voltage (Note 7)
Boost Diode Forward Voltage
I SW = 1A
I SW = 1A
I DIO = 100mA
380
30
0.01
1.9
600
500
50
1
2.5
mV
mA
μA
V
mV
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: This IC includes overtemperature protection that is intended
to protect the device during momentary overload conditions. Junction
temperature will exceed 125°C when overtemperature protection is active.
Continuous operation above the speci?ed maximum operating junction
temperature may impair device reliability.
Note 3: The LT3474E and LT3474E-1 are guaranteed to meet performance
speci?cations from 0°C to 70°C. Speci?cations over the –40°C to 85°C
operating temperature range are assured by design, characterization and
correlation with statistical process controls. The LT3474I and LT3474I-1
are guaranteed to meet performance speci?cations over the –40°C to
125°C operating temperature range.
Note 4: Current ?ows out of pin.
Note 5: Current ?ows into pin.
Note 6: Current limit is guaranteed by design and/or correlation to static
test. Slope compensation reduces current limit at higher duty cycles.
Note 7: This is the minimum voltage across the boost capacitor needed to
guarantee full saturation of the internal power switch.
3474fd
3
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