LT3980IMSE-TRPBF 查看數據表（PDF） - Linear Technology
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LT3980IMSE-TRPBF
Linear Technology
LT3980IMSE-TRPBF Datasheet PDF : 24 Pages
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LT3980
Typical Performance Characteristics TA = 25°C unless otherwise noted.
Efficiency, VOUT = 3.3V
90
VIN = 12V
85
80
VIN = 24V
75
VIN = 48V
70
65
60
55 f = 400kHz
D = DIODES, INC. SBR3U100LP
50
0
0.5
1
1.5
ILOAD (A)
2
3980 G01
No-Load Supply Current
130
VOUT = 3.3V
110
90
70
50
30
10
0 10 20 30 40 50 60
INPUT VOLTAGE (V)
3980 G04
Maximum Load Current,
VOUT = 5V
3.5
TYPICAL
3.0
MINIMUM
2.5
2.0
5
10 15 20 25 30 35 40 45 50 55 60
INPUT VOLTAGE (V)
3980 G07
4
Efficiency, VOUT = 5V
95
90
VIN = 12V
85
VIN = 24V
80
VIN = 48V
75
70
65
60
55 f = 400kHz
D = DIODES, INC. SBR3U100LP
50
0
0.5
1
1.5
ILOAD (A)
2
3980 G02
No-Load Supply Current
400
CATCH DIODE: DIODES, INC. PDS360
350 VIN = 12V
300 VOUT = 3.3V
INCREASED SUPPLY
250
CURRENT DUE TO CATCH
DIODE LEAKAGE AT
200
HIGH TEMPERATURE
150
100
50
0
–50 –25
0 25 50 75 100 125 150
TEMPERATURE (°C)
3980 G05
Efficiency vs Switching Frequency
88
4.0
86
3.5
84
3.0
82
2.5
80
2.0
78
1.5
76
1.0
VIN = 12V
74 VOUT = 5V
0.5
IOUT = 2A
72
0
0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60 1.80 2.00
SWITCHING FREQUENCY (MHz)
3980 G03
Maximum Load Current,
VOUT = 3.3V
3.5
TYPICAL
3.0
MINIMUM
2.5
2.0
5
10 15 20 25 30 35 40 45 50 55 60
INPUT VOLTAGE (V)
3980 G06
Switch Current Limit
5.0
4.5
4.0
TYPICAL
3.5
MINIMUM
3.0
2.5
2.0
0
20
40
60
80 100
DUTY CYCLE (%)
3980 G08
Switch Current Limit
6.5
6.0
5.5
5.0
4.5
DUTY CYCLE = 10%
4.0
3.5
3.0
2.5
2.0
–50 –25
0 25 50 75 100 125 150
TEMPERATURE (°C)
3980 G09
3980fa
For more information www.linear.com/LT3980
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