LT1959 Ver la hoja de datos (PDF) - Linear Technology
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LT1959 Datasheet PDF : 24 Pages
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LT1959
TYPICAL PERFORMANCE CHARACTERISTICS
Frequency Foldback
500
SWITCHING
FREQUENCY
400
300
200
100
0
0
FEEDBACK
PIN CURRENT
0.2 0.4 0.6 0.8 1.0 1.2
FEEDBACK PIN VOLTAGE (V)
1959 • G10
Switching Frequency
550
540
530
520
510
500
490
480
470
460
450
– 50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
1959 G11
Maximum Load Current
at VOUT = 5V
4.4
L= 10µH
4.2
4.0
L= 5µH
3.8
3.6
L= 3µH
3.4
3.2
3.0
L= 1.8µH
2.8
2.6
5
7
9
11
INPUT VOLTAGE (V)
13
15
1959 G13
Maximum Load Current
at VOUT = 3.3V
4.4
L= 10µH
4.2
L= 5µH
4.0
3.8
L= 3µH
3.6
3.4
L= 1.8µH
3.2
3.0
4
6
8
10
12
14
INPUT VOLTAGE (V)
1959 G14
BOOST Pin Current
100
DUTY CYCLE = 100%
90
80
70
60
50
40
30
20
10
0
0
1
2
3
4
5
SWITCH CURRENT (A)
1959 G15
Current Limit Foldback
7
FOLDBACK
CHARACTERISTICS
6
POSSIBLE UNDESIRED
CURRENT
5
STABLE POINT FOR
CURRENT SOURCE
SOURCE
LOAD
LOAD*
4
RESISTOR
LOAD
3
2
MOS LOAD
1
0
0
20
40
60
80 100
OUTPUT VOLTAGE (%)
1959 G16
VC Pin Shutdown Threshold
1.4
SHUTDOWN
1.2
1.0
0.8
0.6
0.4
–50 –25 0 25 50 75 100 125
JUNCTION TEMPERATURE (°C)
1959 G17
Switch Voltage Drop
500
450
125°C
400
350
25°C
300
250
– 40°C
200
150
100
50
0
0
1
2
3
4
5
SWITCH CURRENT (A)
1959 G18
*See “More Than Just Voltage Feedback” in the Applications Information section.
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