SC411EVB SEMTECH [Semtech Corporation], SC411EVB Datasheet - Page 21

• Manufacturer Part Number: SC411EVB
• Description: Synchronous Buck Pseudo-Fixed Frequency Power Supply Controller
• Manufacturer: SEMTECH [Semtech Corporation]

Phase nodes (black) to be copper islands (preferred) or wide copper traces. Gate drive traces (red) and phase node
traces (blue) to be wide copper traces (L:W < 20:1) and as short as possible, with DL the most critical.
© 2007 Semtech Corp.
POWER MANAGEMENT
PGOOD
VBAT = 8V to 20V
VOUT = 1.2V @ 10A
1
2
3
4
VBAT
FB
VOUT
VCCA
PGD
U1
R1
R1
806k
806k
0402
C8
C8
1nF
1nF
0402
C5
C5
220p
220p
0402
VOUT
R3
R3
28k
28k
0402
R5
R5
20k
20k
0402
R2
R2
10R
10R
0402
5VSUS
SC411
Figure 10: Connecting the Control and Power Sections
C9
C9
1uF
1uF
0603
1
2
3
4
VOUT
VCCA
FB
PGD
U1
U1
Figure 11: High Effi ciency Design
VDDP
SC411
SC411
ILIM
DH
LX
12
11
10
9
21
VDDP
ILIM
DH
LX
12
11
10
9
R4 7k87
0402
5VSUS
C10
C10
1uF
1uF
0603
R4 7k15
R4 7k15
0402
D1
D1
SOD323
C1
C1
0u1
0u1
0603
L1 = 1.5uH Vishay IHLP 5050CE
C6, C7 = 470uF / 15milli ohm
Sanyo POS Cap 2R5TPE470MF
IRF7811AV
FDS6676S
IRF7821
IRF7821
IRF7832
IRF7832
Q1
Q1
Q2
Q2
Q1
Q2
VBAT
C2
C2
2n2/50V
2n2/50V
0402
L1
L1
1u5
1u5
C3
C3
0u1/25V
0u1/25V
0603
L1
+
+
C6
C6
470u/15m
470u/15m
7343
C4
C4
10u/25V
10u/25V
1210
2u2
www.semtech.com
+
+
SC411
C7
C7
470u/15m
470u/15m
7343
VOUT