LT3476IUHF View Datasheet(PDF) - Linear Technology
Part Name
Description
Manufacturer
LT3476IUHF Datasheet PDF : 14 Pages
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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 TA = 25°C. SW1-4 = 5V, VIN = 3.3V, SHDN = 3.3V, RT = 21k to GND,
PWM1-4 = 3.3V, VADJ1-4 = REF, CAP1-4 = 5V, unless otherwise noted.
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
REF Line Regulation
2.8V ≤ VIN ≤ 16V
0.003
%/V
Quiescent Current in Shutdown
SHDN = 0V
0.1
10
µA
Quiescent Current Idle
PWM1-4 = 0V
5.5
mA
Quiescent Current Active (Not Switching)
VC1-4 = 0V
22
30
mA
Switching Frequency
Nominal RT Pin Voltage
RT = 8.25k
RT = 21k
RT = 140k
1700 2000 2300
kHz
850 1000 1150
kHz
160
200
240
kHz
1.26
V
Maximum Duty Cycle
VADJ1-4 Input Bias Current
VC1-4 Idle Input Bias Current
RT = 8.25k (2MHz)
RT = 21k (1MHz)
RT = 140k (200kHz)
Current Out of Pin
PWM1-4 = 0V
76
%
84
90
%
98
%
–10
20
100
nA
–20
0
20
nA
EAMP GM (∆IVC/∆VCAP-LED)
210
µS
VC Output Impedance
3
MΩ
SW1-4 Current Limit
Static Test
1.5
2
2.5
A
SW1-4 VCESAT
ISW = 1.3A to GND
350
mV
SW1-4 Leakage Current
SHDN = 0V
0.1
5
µA
CAP1-4 Overvoltage Protect Threshold
33.5
35
V
CAP1-4/LED1-4 Idle Input Bias Current
PWM1-4 < 0.4V, CAP = LED = 5V
100
nA
CAP1-4/LED1-4 Input Bias Current
CAP = LED = 5V
70
µA
SHDN Input Low Voltage
l
0.4
V
SHDN Input High Voltage
l 1.5
V
SHDN Pin Current
16
30
µA
PWM1-4 Input Low Voltage
l
0.4
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.
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