LM2678S-3.3 National Semiconductor, LM2678S-3.3 Datasheet - Page 21

• Manufacturer Part Number: LM2678S-3.3
• Description: DC/DC Converter IC
• Manufacturer: National Semiconductor

Specifications of LM2678S-3.3

• Input Voltage: 40V
• Output Voltage: 3.3V
• No. Of Pins: 7
• Termination Type: SMD
• Mounting Type: Through Hole
• Voltage Regulator Type: Buck Switching
• Output Current Max: 5A
• Peak Reflow Compatible (260 C): No
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

Capacitor Selection Guides
*
No. represents the number of identical capacitor types to be connected in parallel
C Code indicates the Capacitor Reference number in Table 2 for identifying the specific component from the manufacturer.
Voltage (V)
Check voltage rating of capacitors to be greater than application input voltage.
Output
3.3
12
5
(Assumes worst case maximum input voltage and load current for a given inductance value)
Voltage (V)
Inductance
Output
3.3
12
5
(µH)
100
10
15
22
33
10
15
22
33
47
10
15
22
33
47
68
Inductance
TABLE 4. Input Capacitors for Fixed Output Voltage Application
Sanyo OS-CON SA
(µH)
100
10
15
22
33
10
15
22
33
47
10
15
22
33
47
68
No.
2
*
*
*
2
*
*
*
*
2
2
*
*
*
*
*
Series
C Code
AVX TPS Series
C10
C10
No.
C9
C7
3
3
4
4
4
4
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
(Continued)
Sanyo MV-GX Series Nichicon PL Series
C Code
No.
C7
C4
C9
C9
C8
C9
*
*
*
*
*
*
*
*
*
*
2
2
1
1
2
2
2
1
1
2
2
2
2
1
1
1
21
C Code
Surface Mount
C13
C14
C14
C13
C14
C12
C12
C14
C13
C11
No.
Sprague 594D
Through Hole
C8
C8
C8
C8
C8
C8
2
3
2
2
2
3
3
2
1
2
2
3
3
2
2
1
Series
C Code
C10
C13
C13
C13
C12
C13
C13
C13
C10
C10
C12
C13
C13
C13
C13
No.
C6
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
Kemet T495 Series
C Code
C18
C25
C24
C24
C25
C25
C25
C23
C19
C18
C18
C18
C24
C23
C21
C22
No.
3
4
3
3
3
4
4
3
2
4
4
4
4
3
2
2
C Code
Panasonic HFQ
C12
C12
C12
C10
C12
C12
C12
C10
C10
C10
C12
C12
C12
C12
No.
C9
C9
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
Series
C Code
www.national.com
C16
C16
C16
C16
C13
C11
C14
C13
C15
C11
C8
C8
C8
C8
C8
C8