LT3580H 데이터 시트보기 (PDF) - Linear Technology
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LT3580H
Linear Technology
LT3580H 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
VFB = Positive Feedback Voltage, Current Into Pin
l 81
83.3
85
μA
VFB = Negative Feedback Voltage, Current Out of Pin
(LT3580E, LT3580I, LT3580MP)
l 81
83.3 85.5
μA
(LT3580H)
l 81
83.3
86
μA
Error Amplifier Transconductance
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 (LT3580E, LT3580I, LT3580H)
RT = 45.3k (LT3580MP)
RT = 464k (LT3580E, LT3580I, LT3580H)
RT = 464k (LT3580MP)
Compared to Normal fOSC
SYNCing or Free Running
1
1.5
mA
0
1
μA
0.01 0.05
%/V
l 1.8
2
2.2
MHz
l 1.8
2
2.25
MHz
l 180
200
220
kHz
l 180
200
225
kHz
1/4
Ratio
l 200
2500
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 (Note3) (LT3580E, LT3580I, LT3580H) l 2.2
2.5
2.8
A
Minimum Duty Cycle (Note3) (LT3580MP)
l 2.15
2.2
2.8
A
Maximum Duty Cycle (Notes 3, 4) (LT3580E, LT3580I, l 1.6
1.9
2.6
A
LT3580MP)
Maximum Duty Cycle (Notes 3, 4) (LT3580H)
l 1.55
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
300
mV
VSW = 5V
0.01
1
μA
VSS = 0.5V
l
4
6
8
μA
Active Mode, SHDN Rising (LT3580E, LT3580I)
l 1.27 1.32 1.38
V
Active Mode, SHDN Rising (LT3580H, LT3580MP)
l 1.25 1.32
1.4
V
Active Mode, SHDN Falling (LT3580E, LT3580I)
l 1.24 1.29 1.33
V
Active Mode, SHDN Falling (LT3580H, LT3580MP) l 1.22 1.29 1.35
V
Shutdown Mode
l
0.3
V
VSHDN = 3V
VSHDN = 1.3V
VSHDN = 0V
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. The LT3580H is guaranteed over the full –40°C to
150°C operating junction temperature range. The LT3580MP is guaranteed
over the full –55°C to 125°C operating junction temperature range.
Operating lifetime is derated at junction temperatures greater than 125°C.
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 150°C when overtemperature protection is active.
Continuous operation above the specified maximum operating junction
temperature may impair device reliability.
3580fg
3
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