LT3579IUFD-1-PBF Просмотр технического описания (PDF) - Linear Technology
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LT3579IUFD-1-PBF Datasheet PDF : 40 Pages
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LT3579/LT3579-1
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, VFAULT = VIN unless otherwise noted. (Note 2).
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
Minimum Input Voltage
l
2.3
2.5
V
VIN Overvoltage Lockout
Positive Feedback Voltage
16.2 18.7 21.2
V
l 1.195 1.215 1.230
V
Negative Feedback Voltage
l
3
9
16
mV
Positive FB Pin Bias Current
Negative FB Pin Bias Current
Error Amp Transconductance
VFB=Positive Feedback Voltage, Current into Pin
VFB=Negative Feedback Voltage, Current out of Pin
ΔI=10μA
l 80.5 83.3
85
μA
l 81
83.3 85.5
μA
250
μmhos
Error Amp Voltage Gain
70
V/V
Quiescent Current
Not Switching
1.9
2.4
mA
Quiescent Current in Shutdown
VSHDN = 0V
0
1
μA
Reference Line Regulation
Switching Frequency, fOSC
Switching Frequency in Foldback
Switching Frequency Range
2.5V ≤ VIN ≤ 15V
RT = 34kΩ
RT = 432kΩ
Compared to Normal fOSC
Free-Running or Synchronizing
0.01 0.05
%/V
l 2.2
2.5
2.8
MHz
l 175
200
225
kHz
1/6
ratio
l 200
2500
kHz
SYNC High Level for Sync
l 1.3
V
SYNC Low Level for Sync
l
0.4
V
SYNC Clock Pulse Duty Cycle
VSYNC = 0V to 2V
20
80
%
Recommended Minimum SYNC Ratio
fSYNC/fOSC
Minimum Off-Time
3/4
45
nS
Minimum On-Time
55
nS
SW1 Current Limit
At All Duty Cycles (Note 3)
l 3.4
4.2
5.1
A
SW Current Sharing, ISW2/ISW1
SW1 + SW2 Current Limit
SW1 and SW2 Tied Together
ISW2/ISW1 = 0.78, At All Duty Cycles (Note 3)
0.78
A/A
l
6
7.5
9.4
A
Switch VCESAT
SW1 Leakage Current
SW2 Leakage Current
SW1 and SW2 Tied Together, ISW1 + ISW2 = 5.5A
VSW1 = 5V
VSW2 = 5V
250 350
mV
0.01
1
μA
0.01
1
μA
35791f
3
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