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LT1371CSW 数据表(PDF) 3 Page - Linear Technology

部件名 LT1371CSW
功能描述  500kHz High Efficiency 3A Switching Regulator
PDF  16 Pages
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制造商  LINER [Linear Technology]
网页  http://www.linear.com
标志 LINER - Linear Technology

LT1371CSW 数据表(HTML) 3 Page - Linear Technology

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3
LT1371
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
VNFB
Negative Feedback Reference Voltage
Measured at Negative Feedback Pin
– 2.540
– 2.490
– 2.440
V
Feedback Pin Open, VC = 0.8V
q
– 2.570
– 2.490
– 2.410
V
INFB
Negative Feedback Input Current
VNFB = VNFR
q
–45
– 30
–15
µA
Negative Feedback Reference Voltage
2.7V
≤ VIN ≤ 25V, VC = 0.8V
q
0.01
0.05
%/V
Line Regulation
gm
Error Amplifier Transconductance
∆IC = ±25µA
1100
1500
1900
µmho
q
700
2300
µmho
Error Amplifier Source Current
VFB = VREF – 150mV, VC = 1.5V
q
120
200
350
µA
Error Amplifier Sink Current
VFB = VREF + 150mV, VC = 1.5V
q
1400
2400
µA
Error Amplifier Clamp Voltage
High Clamp, VFB = 1V
1.70
1.95
2.30
V
Low Clamp, VFB = 1.5V
0.25
0.40
0.52
V
AV
Error Amplifier Voltage Gain
500
V/ V
VC Pin Threshold
Duty Cycle = 0%
0.8
1
1.25
V
f
Switching Frequency
2.7V
≤ VIN ≤ 25V
450
500
550
kHz
0
°C ≤ TJ ≤ 125°C
q
430
500
580
kHz
– 40
°C ≤ TJ ≤ 0°C (I Grade)
400
580
kHz
Maximum Switch Duty Cycle
q
85
95
%
Switch Current Limit Blanking Time
130
260
ns
BV
Output Switch Breakdown Voltage
LT1371
q
35
47
V
LT1371HV
0
° C ≤ TJ ≤ 125°C
q
42
47
V
– 40
°C ≤ TJ ≤ 0°C (I Grade)
40
V
VSAT
Output Switch ON Resistance
ISW = 2A
q
0.25
0.45
Ω
ILIM
Switch Current Limit
Duty Cycle = 50%
q
3.0
3.8
5.4
A
Duty Cycle = 80% (Note 1)
q
2.6
3.4
5.0
A
∆IIN
Supply Current Increase During Switch ON Time
15
25
mA/A
∆ISW
Control Voltage to Switch Current
4A/V
Transconductance
Minimum Input Voltage
q
2.4
2.7
V
IQ
Supply Current
2.7V
≤ VIN ≤ 25V
q
4
5.5
mA
Shutdown Supply Current
2.7V
≤ VIN ≤ 25V, VS/S ≤ 0.6V
0
° C ≤ TJ ≤ 125°C
q
12
30
µA
– 40
°C ≤ TJ ≤ 0°C (I Grade)
50
µA
Shutdown Threshold
2.7V
≤ VIN ≤ 25V
q
0.6
1.3
2
V
Shutdown Delay
q
512
25
µs
S/S or SHDN Pin Input Current
0V
≤ VS/S or VSHDN ≤ 5V
q
–10
15
µA
Synchronization Frequency Range
q
600
800
kHz
ELECTRICAL C
C
HARA TERISTICS
VIN = 5V, VC = 0.6V, VFB = VREF, VSW, S/S, SHDN, SYNC and NFB pins open, unless otherwise noted.
The q denotes specifications which apply over the full operating
temperature range.
Note 1: For duty cycles (DC) between 50% and 90%, minimum
guaranteed switch current is given by ILIM = 1.33 (2.75 – DC).



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