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LT1777
TYPICAL APPLICATIONS
U
Internal Dissipation
Figure 11. Efficiency and LT1777 Internal Dissipation for the Basic 3.3V Output Application
I
OUT
(mA)
0
0.6
0.4
0.2
1.4
1.2
1.0
0.8
1777 F11b
INTERNAL DISSIPATION (W)
10
1000
100
1µH
0µH
L
SENSE
=
2.2µH
V
IN
= 12V
V
OUT
= 3.3V
T
A
= 25°C
I
OUT
(mA)
0
0.6
0.4
0.2
1.4
1.2
1.0
0.8
1777 F11d
INTERNAL DISSIPATION (W)
10
1000
100
1µH
0µH
L
SENSE
=
2.2µH
V
IN
= 24V
V
OUT
= 3.3V
T
A
= 25°C
I
OUT
(mA)
0
0.6
0.4
0.2
1.4
1.2
1.0
0.8
1777 F11f
INTERNAL DISSIPATION (W)
10
1000
100
1µH
0µH
L
SENSE
=
2.2µH
V
IN
= 36V
V
OUT
= 3.3V
T
A
= 25°C
V
IN
= 12V
V
IN
= 24V
V
IN
= 36V
Efficiency
I
LOAD
(mA)
1
90
EFFICIENCY (%)
20
30
40
10 100 1000
1777 F11a
80
70
60
50
V
IN
= 12V
V
OUT
= 3.3V
T
A
= 25°C
L
SENSE
=
0µH
1µH
2.2µH
I
LOAD
(mA)
1
90
EFFICIENCY (%)
20
30
40
10 100 1000
1777 F11c
80
70
60
50
V
IN
= 24V
V
OUT
= 3.3V
T
A
= 25°C
L
SENSE
=
0µH
1µH
2.2µH
I
LOAD
(mA)
1
90
EFFICIENCY (%)
20
30
40
10 100 1000
1777 F11e
80
70
60
50
V
IN
= 36V
V
OUT
= 3.3V
T
A
= 25°C
L
SENSE
=
0µH
1µH
2.2µH
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