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LT3581 Datasheet(PDF) 3 Page - Linear Technology

Part # LT3581
Description  3.3A Boost/Inverting DC/DC Converter with Fault Protection
PDF  36 Pages
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LT3581 Datasheet(HTML) 3 Page - Linear Technology

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LT3581

3581f
elecTrical characTerisTics
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Minimum Input Voltage
l
2.3
2.5
V
VIN Overvoltage Lockout
22.1
23.5
25
V
Positive Feedback Voltage
l
1.195
1.215
1.230
V
Negative Feedback Voltage
l
3
9
16
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 Amp Transconductance
ΔI = 10μA
270
µmhos
Error Amp Voltage Gain
70
V/V
Quiescent Current
Not Switching
1.9
2.3
mA
Quiescent Current in Shutdown
VSHDN = 0V
0
1
µA
Reference Line Regulation
2.5V ≤ VIN ≤ 20V
0.01
0.05
%/V
Switching Frequency, fOSC
RT = 34k
l
2.25
2.5
2.75
MHz
RT = 432k
l
180
200
220
kHz
Switching Frequency in Foldback
Compared to Normal fOSC
1/6
ratio
Switching Frequency Range
Free-Running or Synchronizing
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
20
80
%
Recommended Minimum SYNC Ratio
fSYNC/fOSC
3/4
Minimum Off-Time
45
ns
Minimum On-Time
55
ns
SW1 Current Limit
At All Duty Cycles
l
1.9
2.4
3
A
Current Sharing (SW2/SW1)
78
%
SW1 + SW2 Current Limit
At All Duty Cycles, SW2/SW1 = 78% (Note 3)
l
3.3
4.3
5.4
A
Switch VCESAT
SW1 & SW2 Tied Together, ISW1 + ISW2 = 2.75A
250
mV
SW1 Leakage Current
VSW1 = 5V
0.01
1
µA
SW2 Leakage Current
VSW2 = 5V
0.01
1
µA
The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VIN = 5V, VSHDN = VIN, VFAULT = VIN, unless otherwise noted. (Note 2).



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