3509 查看數據表（PDF） - Linear Technology
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3509 Datasheet PDF : 24 Pages
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TYPICAL PERFORMANCE CHARACTERISTICS
LT3509
FB Pin Voltage vs Temperature
0.810
0.805
0.800
0.795
0.790
–50 –25 0 25 50 75 100 125 150
TEMPERATURE (°C)
3509 G08
fSW vs Temperature
(Measured at 1MHz)
1.04
1.03
1.02
1.01
1.00
0.99
0.98
0.97
–50 –25
0 25 50 75 100 125 150
TEMPERATURE (˚C)
3509 G09
Max VIN for Constant Frequency
VOUT = 3.3V, fSW = 2MHz
30
TA = 25ºC
25
TA = 85ºC
20
15
10
5
0
0
0.2
0.4
0.6
0.8
ILOAD (A)
3509 G10
Max VIN for Constant Frequency
VOUT = 5V, fSW = 2MHz
45
40
TA = 25ºC
35
TA = 85ºC
30
25
20
15
10
5
0
0
0.2
0.4
0.6
0.8
ILOAD (A)
3509 G11
Minimum On-Time vs
Temperature, ILOAD = 0.3A
160
140
120
100
80
60
40
20
0
–50 –25
0 25 50 75 100 125 150
TEMPERATURE (°C)
3509 G12
ILIM vs Temperature
1.5
1.3
SWITCH
1.0
DA
0.9
0.7
0.5
–50 –25
0 25 50 75 100 125 150
TEMPERATURE (°C)
3509 G13
ILIM vs Duty Cycle
1.8
1.6
TA = 25ºC
1.4
1.2
1
0.8
0.6
0.4
0.2
0
0 10 20 30 40 50 60 70 80 90 100
DUTY CYCLE (%)
3509 G14
3509fc
5
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