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LT3476
ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating
temperature range, (Note 3) otherwise specifications are at T A = 25°C. SW1-4 = 5V, V IN = 3.3V, SHDN = 3.3V, R T = 21k to GND,
PWM1-4 = 3.3V, V ADJ1-4 = REF, CAP1-4 = 5V, unless otherwise noted.
PARAMETER
REF Line Regulation
Quiescent Current in Shutdown
Quiescent Current Idle
Quiescent Current Active (Not Switching)
Switching Frequency
CONDITIONS
2.8V ≤ V IN ≤ 16V
SHDN = 0V
PWM1-4 = 0V
VC1-4 = 0V
R T = 8.25k
R T = 21k
R T = 140k
MIN
1700
850
160
TYP
0.003
0.1
5.5
22
2000
1000
200
MAX
10
30
2300
1150
240
UNITS
%/V
μA
mA
mA
kHz
kHz
kHz
Nominal RT Pin Voltage
1.26
V
Maximum Duty Cycle
R T = 8.25k (2MHz)
R T = 21k (1MHz)
R T = 140k (200kHz)
84
76
90
98
%
%
%
V ADJ1-4 Input Bias Current
VC1-4 Idle Input Bias Current
Current Out of Pin
PWM1-4 = 0V
–10
–20
20
0
100
20
nA
nA
EAMP GM (?I VC /?V CAP-LED )
VC Output Impedance
210
3
μS
MΩ
SW1-4 Current Limit
SW1-4 V CESAT
SW1-4 Leakage Current
Static Test
I SW = 1.3A to GND
SHDN = 0V
1.5
2
350
0.1
2.5
5
A
mV
μA
CAP1-4 Overvoltage Protect Threshold
CAP1-4/LED1-4 Idle Input Bias Current
CAP1-4/LED1-4 Input Bias Current
SHDN Input Low Voltage
PWM1-4 < 0.4V, CAP = LED = 5V
CAP = LED = 5V
l
33.5
35
70
100
0.4
V
nA
μA
V
SHDN Input High Voltage
l
1.5
V
SHDN Pin Current
PWM1-4 Input Low Voltage
l
16
30
0.4
μA
V
PWM1-4 Input High Voltage
l
1.5
V
PWM1-4 Pin Current
50
100
μA
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 specified maximum operating junction
temperature may impair device reliability.
Note 3: The LT3476E is guaranteed to meet specifications from 0°C?to
85°C junction temperature. Specifications over the –40°C?to?85°C
operating junction temperature range are assured by design,
characterization and correlation with statistical process controls. The
LT3476I is guaranteed to meet performance specifications over the –40°C
to 125°C operating junction temperature range.
3476fb
3
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