LT3580(RevC) 데이터 시트보기 (PDF) - Linear Technology
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LT3580
(Rev.:RevC)
(Rev.:RevC)
Linear Technology
LT3580 Datasheet PDF : 28 Pages
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LT3580
ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VIN = 5V, VSHDN = VIN unless otherwise noted. (Note 2)
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
Operating Voltage Range
l 2.5
32
V
Positive Feedback Voltage
l 1.195 1.215 1.230
V
Negative Feedback Voltage
l
0
5
12
mV
Positive FB Pin Bias Current
Negative FB Pin Bias Current
Error Amplifier Transconductance
VFB = Positive Feedback Voltage, Current Into Pin l 81
VFB = Negative Feedback Voltage, Current Out of Pin l 81
83.3
85
μA
83.3 85.5
μA
230
μmhos
Error Amplifier Voltage Gain
70
V/V
Quiescent Current
Quiescent Current in Shutdown
Reference Line Regulation
Switching Frequency, fOSC
Switching Frequency in Foldback
Switching Frequency Set Range
VSHDN = 2.5V, Not Switching
VSHDN = 0V
2.5V ≤ VIN ≤ 32V
RT = 45.3k
RT = 464k
Compared to Normal fOSC
SYNCing or Free Running
l 1.8
l 180
l 200
1
1.5
0
1
0.01 0.05
2
2.2
200 220
1/4
2500
mA
μA
%/V
MHz
kHz
Ratio
kHz
SYNC High Level for Synchronization
l 1.3
V
SYNC Low Level for Synchronization
l
0.4
V
SYNC Clock Pulse Duty Cycle
Recommended Minimum SYNC Ratio fSYNC/fOSC
Minimum Off-Time
VSYNC = 0V to 2V
35
65
%
3/4
60
nS
Minimum On-Time
100
nS
Switch Current Limit
Minimum Duty Cycle (Note 3)
Maximum Duty Cycle (Notes 3, 4)
l 2.2
2.5
2.8
A
l 1.6
1.9
2.6
A
Switch VCESAT
Switch Leakage Current
Soft-Start Charging Current
SHDN Minimum Input
Voltage High
SHDN Input Voltage Low
SHDN Pin Bias Current
ISW = 1.5A
VSW = 5V
VSS = 0.5V
Active Mode, SHDN Rising
Active Mode, SHDN Falling
Shutdown Mode
VSHDN = 3V
VSHDN = 1.3V
VSHDN = 0V
300
mV
0.01
1
μA
l
4
6
8
μA
l 1.27 1.32 1.38
V
l 1.24 1.29 1.33
V
l
0.3
V
40
60
μA
9.7
11.6 13.4
μA
0
0.1
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: The LT3580E 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
LT3580I is guaranteed over the full –40°C to 125°C operating junction
temperature range.
Note 3: Current limit guaranteed by design and/or correlation to static test.
Note 4: Current limit measured at equivalent switching frequency of
2.5MHz.
Note 5: 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.
3580fc
3
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