LT1777 Linear Technology, LT1777 Datasheet - Page 20

• Manufacturer Part Number: LT1777
• Description: Low Noise Step-Down Switching Regulator
• Manufacturer: Linear Technology

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