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參數(shù)資料
| 型號(hào)： | LT3579IUFD-1#PBF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | SWITCHING REGULATOR, PQCC20 |
| 封裝： | 4 X 5 MM, LEAD FREE, PLASTIC, MO-220, QFN-20 |
| 文件頁數(shù)： | 23/40頁 |
| 文件大小： | 503K |
| 代理商： | LT3579IUFD-1#PBF |
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LT3579/LT3579-1
3
35791f
elecTrical characTerisTics
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Minimum Input Voltage
l
2.3
2.5
V
VIN Overvoltage Lockout
16.2
18.7
21.2
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
80.5
83.3
85
A
Negative FB Pin Bias Current
VFB=Negative Feedback Voltage, Current out of Pin
l
81
83.3
85.5
A
Error Amp Transconductance
ΔI=10μA
250
mhos
Error Amp Voltage Gain
70
V/V
Quiescent Current
Not Switching
1.9
2.4
mA
Quiescent Current in Shutdown
VSHDN = 0V
0
1
A
Reference Line Regulation
2.5V ≤ VIN ≤ 15V
0.01
0.05
%/V
Switching Frequency, fOSC
RT = 34k
l
2.2
2.5
2.8
MHz
RT = 432k
l
175
200
225
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 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
3/4
Minimum Off-Time
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 and SW2 Tied Together
0.78
A/A
SW1 + SW2 Current Limit
ISW2/ISW1 = 0.78, At All Duty Cycles (Note 3)
l
6
7.5
9.4
A
Switch VCESAT
SW1 and SW2 Tied Together, ISW1 + ISW2 = 5.5A
250
350
mV
SW1 Leakage Current
VSW1 = 5V
0.01
1
A
SW2 Leakage Current
VSW2 = 5V
0.01
1
A
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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