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
2.5
1.195
0
TYP
MAX
32
UNITS
V
l
l
l
l
l
Operating Voltage Range
Positive Feedback Voltage
Negative Feedback Voltage
Positive FB Pin Bias Current
Negative FB Pin Bias Current
Error Amplifier Transconductance
Error Amplifier Voltage Gain
Quiescent Current
1.215
5
1.230
12
V
mV
μA
V
V
= Positive Feedback Voltage, Current Into Pin
= Negative Feedback Voltage, Current Out of Pin
81
83.3
83.3
230
70
85
FB
FB
81
85.5
μA
μmhos
V/V
mA
μA
V
V
= 2.5V, Not Switching
= 0V
1
1.5
1
SHDN
SHDN
Quiescent Current in Shutdown
Reference Line Regulation
0
2.5V ≤ V ≤ 32V
0.01
0.05
%/V
IN
l
l
Switching Frequency, f
R = 45.3k
T
1.8
180
2
200
2.2
220
MHz
kHz
OSC
T
R = 464k
Switching Frequency in Foldback
Switching Frequency Set Range
SYNC High Level for Synchronization
SYNC Low Level for Synchronization
SYNC Clock Pulse Duty Cycle
Recommended Minimum SYNC Ratio f
Minimum Off-Time
Compared to Normal f
1/4
Ratio
kHz
V
OSC
l
l
l
SYNCing or Free Running
200
1.3
2500
0.4
65
V
V
= 0V to 2V
35
%
SYNC
/f
3/4
60
SYNC OSC
nS
nS
Minimum On-Time
100
l
l
Switch Current Limit
Minimum Duty Cycle (Note 3)
Maximum Duty Cycle (Notes 3, 4)
2.2
1.6
2.5
1.9
2.8
2.6
A
A
Switch V
I
= 1.5A
SW
300
0.01
6
mV
μA
μA
CESAT
Switch Leakage Current
V
V
= 5V
1
8
SW
SS
l
Soft-Start Charging Current
= 0.5V
4
l
l
SHDN Minimum Input
Voltage High
Active Mode, SHDN Rising
Active Mode, SHDN Falling
1.27
1.24
1.32
1.29
1.38
1.33
V
V
l
SHDN Input Voltage Low
SHDN Pin Bias Current
Shutdown Mode
0.3
V
V
V
V
= 3V
= 1.3V
= 0V
40
11.6
0
60
13.4
0.1
μA
μA
μA
SHDN
SHDN
SHDN
9.7
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
Linear [ Linear ]
