LT1578 データシートの表示（PDF） - Linear Technology
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LT1578 Datasheet PDF : 28 Pages
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TYPICAL PERFORMANCE CHARACTERISTICS
LT1578/LT1578-2.5
Switching Frequency
240
220
Switch Current Limit Foldback
3.0
2.5
2.0
Minimum Input Voltage to Start
with 3.3V Output
4.50
4.25
200
1.5
4.00
1.0
180
3.75
0.5
160
–50 –25 0 25 50 75 100 125
JUNCTION TEMPERATURE (°C)
1576 G13
Maximum Output Current
at VOUT = 5V
1.6
L = 60µH
1.4
1.2
L = 30µH
1.0
L = 15µH
0.8
0.6
0.4
0.2
0
6
9
12
15
INPUT VOLTAGE (V)
1578 G15
BOOST Pin Current
30
0
0 0.2 0.4 0.6 0.8 1.0 1.2
FEEDBACK PIN VOLTAGE (V)
1578 G19
3.50
1
10
100
LOAD CURRENT (mA)
1000
1576 G14
Maximum Output Current
at VOUT = 3.3V
1.6
L = 60µH
1.4
L = 30µH
1.2
1.0
L = 15µH
Maximum Output Current
at VOUT = 2.5V
1.6
L = 60µH
1.4
L = 30µH
1.2
L = 15µH
1.0
0.8
0.8
0.6
0.6
0.4
0.4
0.2
0.2
0
4
6
8
10
12
14
INPUT VOLTAGE (V)
1578 G16
0
4
6
8
10
12
14
INPUT VOLTAGE (V)
1578 G17
VC Pin Shutdown Threshold
1.0
25
0.8
20
0.6
15
0.4
10
0.2
5
0
0 0.25 0.50 0.75 1.00 1.25 1.50
SWITCH CURRENT (A)
1576 G20
Kool Mµ is a registered trademark of Magnetics, Inc.
Metglas is a registered trademark of AlliedSignal, Inc.
0
–50 –25 0 25 50 75 100 125
JUNCTION TEMPERATURE (°C)
1576 G21
5
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