LT1940 Ver la hoja de datos (PDF) - Linear Technology
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LT1940 Datasheet PDF : 20 Pages
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LT1940/LT1940L
TYPICAL PERFOR A CE CHARACTERISTICS
Maximum Load Current,
VOUT = 1.8V
1.8
1.6
L = 2.2µH
1.4
L = 1.5µH
L = 1µH
1.2
Maximum Load Current,
VOUT = 3.3V
1.8
SLOPE COMPENSATION REQUIRES
L > 2.2µH FOR VIN < 7 WITH VOUT = 3.3V
1.6
L = 4.7µH
1.4
L = 3.3µH
L = 2.2µH
1.2
Switch VCESAT
400
TA = 25°C
300
200
100
1.0
0 2 4 6 8 10 12 14 16
INPUT VOLTAGE (V)*
1940 G04
Boost Pin Current
40
30
20
10
0
0
0.5
1.0
1.5
2.0
SWITCH CURRENT (A)
1940 G07
Frequency vs Temperature
1.3
1.2
1.1
1.0
0.9
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
1940 G10
1.0
0
5
10
15
20
25
INPUT VOLTAGE (V)*
1940 G05
Current Limit vs Duty Cycle
3.0
2.5
TYPICAL
2.0
1.5
MINIMUM
1.0
0.5
0
0
20
40
60
80 100
DUTY CYCLE (%)
1940 G08
Frequency Foldback
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0
0 0.2 0.4 0.6 0.8 1.0 1.2
FEEDBACK VOLTAGE (V)
1940 G11
0
0
0.5
1.0
1.5
2.0
SW CURRENT (A)
1940 G06
VOUT vs Temperature
3.40
CHANNEL 1, FIGURE 1, VIN = 12V
3.35
3.30
3.25
3.20
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
1940 G09
IRUN/SS vs Temperature
3.0
2.5
2.0
1.5
1.0
0.5
0
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
1940 G12
*Maximum VIN is 7V for LT1940L.
4
1940fa
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