sc1486aitstr Semtech Corporation, sc1486aitstr Datasheet - Page 20

• Manufacturer Part Number: sc1486aitstr
• Description: Complete Ddr1/2/3 Power Supply Controller
• Manufacturer: Semtech Corporation

Layout Guidelines (Cont.)
In Figure 8 on Page 19, all components referenced to VSSA1 and VSSA2 have been placed and have been connected
using copper pours (left) or 0.020” traces (right). Note that there are two separate copper pours or traces, one for
VSSA1 and one for VSSA2. Decoupling capacitors C2 and C22 are as close as possible to their pins, as are VDDP
decoupling capacitors C8 and C9. C8 and C9 should connect to the ground plane using two vias each.
POWER MANAGEMENT
Application Information (Cont.)
2006 Semtech Corp.
1.8V, 10A
C12
0u1
0402
ROUTE AS DIFFERENTIAL PAIR TO OUTPUT CAPACITORS
Figure 9: Differential Routing of Feedback and Ground Reference Traces
+
C13
330u/25m
7343
R7
0R
0402
ROUTE AS DIFFERENTIAL PAIR TO OUTPUT CAPACITORS
1.8V
+
C14
330u/25m
7343
27
22
24
26
23
25
28
3
1
6
7
5
4
2
U1
VDDP1
PGND1
DH1
BST1
LX1
ILIM1
DL1
PGD1
EN/PSV1
VOUT1
FB1
TON1
VCCA1
VSSA1
VSSA1
C17
27p
0402
45k3
0402
17k4
0402
SC1486A
R10
R13
REFOUT
PGND2
VSSA2
VDDP2
VCCA2
REFIN
PGD2
TON2
ILIM2
FB2
BST2
DH2
DL2
LX2
C20
1n
0402
17
15
20
21
19
18
16
13
12
8
10
9
11
14
20
VCCA2
VCCA1
C21
1u
0603
C22
1u
0603
27
22
24
26
23
25
28
0.9V
VSSA2
3
1
6
7
5
4
2
U1
VDDP1
PGND1
DH1
BST1
LX1
ILIM1
DL1
PGD1
EN/PSV1
VOUT1
FB1
TON1
VCCA1
VSSA1
220u/25m
7343
0402
C15
R8
0R
SC1486A
+
REFOUT
PGND2
VSSA2
VDDP2
VCCA2
REFIN
TON2
ILIM2
FB2
PGD2
BST2
DH2
DL2
LX2
C16
0u1
0402
17
15
20
21
19
18
16
13
12
8
10
9
11
14
0.9V, 1.5A
SC1486A
www.semtech.com