LT1371 データシートの表示（PDF） - Linear Technology
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LT1371 Datasheet PDF : 16 Pages
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LT1371
ELECTRICAL CHARACTERISTICS
VIN = 5V, VC = 0.6V, VFB = VREF, VSW, S/S, SHDN, SYNC and NFB pins open, unless otherwise noted.
SYMBOL PARAMETER
VNFB
Negative Feedback Reference Voltage
INFB
Negative Feedback Input Current
Negative Feedback Reference Voltage
Line Regulation
gm
Error Amplifier Transconductance
Error Amplifier Source Current
Error Amplifier Sink Current
Error Amplifier Clamp Voltage
AV
Error Amplifier Voltage Gain
VC Pin Threshold
f
Switching Frequency
Maximum Switch Duty Cycle
Switch Current Limit Blanking Time
BV
Output Switch Breakdown Voltage
VSAT
Output Switch ON Resistance
ILIM
Switch Current Limit
∆IIN
Supply Current Increase During Switch ON Time
∆ISW
Control Voltage to Switch Current
Transconductance
Minimum Input Voltage
IQ
Supply Current
Shutdown Supply Current
Shutdown Threshold
Shutdown Delay
S/S or SHDN Pin Input Current
Synchronization Frequency Range
CONDITIONS
Measured at Negative Feedback Pin
Feedback Pin Open, VC = 0.8V
VNFB = VNFR
2.7V ≤ VIN ≤ 25V, VC = 0.8V
MIN
– 2.540
q – 2.570
q – 45
q
∆IC = ±25µA
VFB = VREF – 150mV, VC = 1.5V
VFB = VREF + 150mV, VC = 1.5V
High Clamp, VFB = 1V
Low Clamp, VFB = 1.5V
1100
q 700
q 120
q
1.70
0.25
Duty Cycle = 0%
2.7V ≤ VIN ≤ 25V
0°C ≤ TJ ≤ 125°C
– 40°C ≤ TJ ≤ 0°C (I Grade)
0.8
450
q 430
400
q 85
LT1371
LT1371HV
0° C ≤ TJ ≤ 125°C
– 40°C ≤ TJ ≤ 0°C (I Grade)
ISW = 2A
Duty Cycle = 50%
Duty Cycle = 80% (Note 1)
q 35
q 42
40
q
q 3.0
q 2.6
2.7V ≤ VIN ≤ 25V
2.7V ≤ VIN ≤ 25V, VS/S ≤ 0.6V
0° C ≤ TJ ≤ 125°C
– 40°C ≤ TJ ≤ 0°C (I Grade)
2.7V ≤ VIN ≤ 25V
0V ≤ VS/S or VSHDN ≤ 5V
q
q
q
q 0.6
q5
q – 10
q 600
TYP
– 2.490
– 2.490
– 30
0.01
1500
200
1400
1.95
0.40
500
1
500
500
95
130
47
47
0.25
3.8
3.4
15
4
2.4
4
12
1.3
12
MAX
– 2.440
– 2.410
– 15
0.05
UNITS
V
V
µA
%/V
1900 µmho
2300 µmho
350
µA
2400
µA
2.30
V
0.52
V
V/ V
1.25
V
550
kHz
580
kHz
580
kHz
%
260
ns
V
V
V
0.45
Ω
5.4
A
5.0
A
25
mA/A
A/ V
2.7
V
5.5
mA
30
µA
50
µA
2
V
25
µs
15
µA
800
kHz
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).
3
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