LT1777CS#PBF Linear Technology, LT1777CS#PBF Datasheet - Page 20

• Manufacturer Part Number: LT1777CS#PBF
• Description: IC SWREG STP-DWN LOWNOISE 16SOIC
• Manufacturer: Linear Technology
• Type: Step-Down (Buck)r

Specifications of LT1777CS#PBF

• Internal Switch(s): Yes
• Synchronous Rectifier: No
• Number Of Outputs: 1
• Voltage - Output: 1.24 ~ 30 V
• Current - Output: 700mA
• Frequency - Switching: 100kHz
• Voltage - Input: 12 ~ 48 V
• Operating Temperature: 0°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: 16-SOIC (3.9mm Width)
• Primary Input Voltage: 48V
• No. Of Outputs: 1
• Output Voltage: 40.8V
• Output Current: 1A
• No. Of Pins: 16
• Operating Temperature Range: 0°C To +125°C
• Msl: MSL 1 - Unlimited
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Power - Output: -

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