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| LT1777_15 Datasheet, PDF (20/24 Pages) Linear Technology – Low Noise Step-Down Switching Regulator | |||
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LT1777
TYPICAL APPLICATIONS
Efficiency
VIN = 12V
90
VIN = 12V
80
VOUT = 3.3V
TA = 25°C
70
60
50
LSENSE =
0µH
1µH
2.2µH
40
30
20
1
10
100
ILOAD (mA)
1000
1777 F11a
VIN = 24V
90
VIN = 24V
80
VOUT = 3.3V
TA = 25°C
70
LSENSE =
0µH
60
1µH
50
2.2µH
40
30
20
1
10
100
ILOAD (mA)
1000
1777 F11c
Internal Dissipation
1.4
VIN = 12V
1.2
VOUT = 3.3V
TA = 25°C
1.0
0.8
0.6
0.4
LSENSE =
2.2µH
1µH
0µH
0.2
0
10
100
IOUT (mA)
1000
1777 F11b
1.4
VIN = 24V
1.2
VOUT = 3.3V
TA = 25°C
1.0
LSENSE =
2.2µH
0.8
1µH
0.6
0µH
0.4
0.2
0
10
100
IOUT (mA)
1000
1777 F11d
VIN = 36V
90
VIN = 36V
80
VOUT = 3.3V
TA = 25°C
70
60
50
40
LSENSE =
0µH
1µH
2.2µH
1.4
VIN = 36V
1.2
VOUT = 3.3V
TA = 25°C
1.0
0.8
0.6
0.4
LSENSE =
2.2µH
1µH
0µH
30
0.2
20
1
10
100
ILOAD (mA)
1000
1777 F11e
0
10
100
IOUT (mA)
1000
1777 F11f
Figure 11. Efficiency and LT1777 Internal Dissipation for the Basic 3.3V Output Application
20
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