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LCXY Datasheet(PDF) 3 Page - Linear Technology

No. de pieza LCXY
Descripción Electrónicos  Boost/Inverting DC/DC Converter with 2A Switch, Soft-Start, and Synchronization
Download  28 Pages
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Fabricante Electrónico  LINER [Linear Technology]
Página de inicio  http://www.linear.com
Logo LINER - Linear Technology

LCXY Datasheet(HTML) 3 Page - Linear Technology

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LT3580
3
3580fc
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.
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
05
12
mV
Positive FB Pin Bias Current
VFB = Positive Feedback Voltage, Current Into Pin
l
81
83.3
85
μA
Negative FB Pin Bias Current
VFB = Negative Feedback Voltage, Current Out of Pin
l
81
83.3
85.5
μA
Error Amplifier Transconductance
230
μmhos
Error Amplifier Voltage Gain
70
V/V
Quiescent Current
VSHDN = 2.5V, Not Switching
1
1.5
mA
Quiescent Current in Shutdown
VSHDN = 0V
0
1
μA
Reference Line Regulation
2.5V ≤ VIN ≤ 32V
0.01
0.05
%/V
Switching Frequency, fOSC
RT = 45.3k
RT = 464k
l
l
1.8
180
2
200
2.2
220
MHz
kHz
Switching Frequency in Foldback
Compared to Normal fOSC
1/4
Ratio
Switching Frequency Set Range
SYNCing or Free Running
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
VSYNC = 0V to 2V
35
65
%
Recommended Minimum SYNC Ratio fSYNC/fOSC
3/4
Minimum Off-Time
60
nS
Minimum On-Time
100
nS
Switch Current Limit
Minimum Duty Cycle (Note 3)
Maximum Duty Cycle (Notes 3, 4)
l
l
2.2
1.6
2.5
1.9
2.8
2.6
A
A
Switch VCESAT
ISW = 1.5A
300
mV
Switch Leakage Current
VSW = 5V
0.01
1
μA
Soft-Start Charging Current
VSS = 0.5V
l
468
μA
SHDN Minimum Input
Voltage High
Active Mode, SHDN Rising
Active Mode, SHDN Falling
l
l
1.27
1.24
1.32
1.29
1.38
1.33
V
V
SHDN Input Voltage Low
Shutdown Mode
l
0.3
V
SHDN Pin Bias Current
VSHDN = 3V
VSHDN = 1.3V
VSHDN = 0V
9.7
40
11.6
0
60
13.4
0.1
μA
μA
μA
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.


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