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SC486EVB View Datasheet(PDF) - Semtech Corporation

Part Name
Description
MFG CO.
SC486EVB
Semtech
Semtech Corporation Semtech
'SC486EVB' PDF : 26 Pages View PDF
SC486
POWER MANAGEMENT
Layout Guidelines (Cont.)
The layout can be considered in three parts, the control section referenced to VSSA, the VTT output, and the
switcher power section. Looking at the control section first, locate all components referenced to VSSA1 on the
schematic and place these components at the chip. Connect VSSA using a wide (>0.020”) trace. Very little current
flows in the chip ground therefore large areas of copper are not needed. Connect the VSSA pin directly to the
thermal pad under the device as the only connection to PGND from VSSA.
5VRUN
VDDQ
R4 10R
C2
C1
R5 4k64
1u
no-pop
REF
R8
23k2
R6
10R
C9
1u
R7 10R
C3
no-pop
C10
no-pop
C11
1n
C12
1u
U1
11 VTTEN
3 VDDQS
2 TON
6 FB
8 REF
9 COMP
SC486
PGD 7
EN/PSV 1
BST 24
10 VTTS
5 VCCA
4 VSSA
14
15
VTT
VTT
12
13
VTTIN
VTTIN
16
17
PGND2
PGND2
DH 23
ILIM 21
LX 22
DL 19
VDDP 20
PAD PGND1 18
C18
1u
Figure 7: Components Connected to VSSA
2006 Semtech Corp.
Figure 8: Example VSSA 0.020” Trace
20
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