LT3990 데이터 시트보기 (PDF) - Linear Technology
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LT3990
Linear Technology
LT3990 Datasheet PDF : 20 Pages
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LT3990
Typical Performance Characteristics TA = 25°C, unless otherwise noted.
Boost Diode Forward Voltage
1.2
1.0
0.8
0.6
0.4
0.2
0
0
–50°C
25°C
125°C
150°C
50
100
150
200
BOOST DIODE CURRENT (mA)
3990 G19
Power Good Threshold
92
91
90
89
88
–50 –25 0 25 50 75 100 125 150
TEMPERATURE (°C)
3990 G22
Transient Load Response; Load
Current is Stepped from 100mA
to 200mA
Catch Diode Forward Voltage
1.0
0.8
0.6
Catch Diode Leakage
15
VR = 12V
12
8
0.4
6
0.2
0
0
–50°C
25°C
125°C
150°C
100
200
300
400
CATCH DIODE CURRENT (mA)
3990 G20
EN/UVLO Threshold
1.260
3
0
–50 –25
0 25 50 75 100 125 150
TEMPERATURE (°C)
3990 G21
Transient Load Response; Load
Current is Stepped from 10mA
(Burst Mode Operation) to 110mA
1.235
VOUT
100mV/DIV
1.210
IL
100mA/DIV
1.185
1.160
–50 –25 0 25 50 75 100 125 150
TEMPERATURE (°C)
3990 G23
100µs/DIV
FRONT PAGE APPLICATION
VIN = 12V
VOUT = 5V
3990 G24
Switching Waveforms,
Burst Mode Operation
Switching Waveforms, Full
Frequency Continuous Operation
VOUT
100mV/DIV
IL
100mA/DIV
100µs/DIV
FRONT PAGE APPLICATION
VIN = 12V
VOUT = 5V
VSW
5V/DIV
IL
100mA/DIV
VOUT
5mV/DIV
3990 G25
2µs/DIV
FRONT PAGE APPLICATION
VIN = 12V
VOUT = 5V
ILOAD = 10mA
f = 600kHz
VSW
5V/DIV
IL
200mA/DIV
VOUT
5mV/DIV
3990 G26
1µs/DIV
FRONT PAGE APPLICATION
VIN = 12V
VOUT = 5V
ILOAD = 350mA
f = 600kHz
3990 G27
3990f
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