LT3971AIMSE-TRPBF データシートの表示（PDF） - Linear Technology
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LT3971AIMSE-TRPBF Datasheet PDF : 24 Pages
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LT3971A/LT3971A-5
TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C, unless otherwise noted.
Minimum Switch On-Time/
Switch Off-Time
400
350
300
250
MIN TOFF 1A LOAD
200
MIN TOFF 0.5A LOAD
150
100
MIN TON
50
0
–55 –25
5 35 65 95
TEMPERATURE (°C)
125 155
3971A G19
Soft-Start
2.5
2.0
1.5
1.0
0.5
0
0 0.25 0.5 0.75 1 1.25 1.5 1.75 2
SS PIN VOLTAGE (V)
3971A G20
Minimum Input Voltage
5.0
VOUT = 3.3V
4.8
4.6
4.4
4.2
TO START
4.0
3.8
TO RUN
3.6
3.4
3.2
3.0
0
200 400 600 800 1000 1200
LOAD CURRENT (mA)
3971A G21
Minimum Input Voltage
6.4
VOUT = 5V
6.2
6.0
TO START
5.8
5.6
5.4
5.2
TO RUN
5.0
0
200 400 600 800 1000 1200
LOAD CURRENT (mA)
3971A G22
EN Threshold
1.05
1.04
1.03
1.02
1.01
RISING THRESHOLD
1.00
0.99
0.98
FALLING THRESHOLD
0.97
0.96
0.95
–55 –25
5 35 65 95
TEMPERATURE (°C)
125 155
3971A G23
Boost Diode Forward Voltage
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0
0 250 500 750 1000 1250 1500
BOOST DIODE CURRENT (mA)
3971A G24
Power Good Threshold
95
94
93
92
91
90
89
88
87
86
85
–55 –25
5 35 65 95
TEMPERATURE (°C)
Transient Load Response,
Load Current Stepped from 25mA
(Burst Mode Operation) to 525mA
VOUT
100mV/DIV
IL
500mA/DIV
125 155
3971A G25
10μs/DIV
VIN = 12V, VOUT = 3.3V
COUT = 47μF
3971A G26
6
Transient Load Response,
Load Current Stepped from
0.5A to 1A
VOUT
100mV/
DIV
IL
500mA/
DIV
10μs/DIV
VIN = 12V, VOUT = 3.3V
COUT = 47μF
3971A G27
3971af
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