SC486 View Datasheet(PDF) - Semtech Corporation
Part Name
Description
MFG CO.
'SC486' PDF : 26 Pages View PDF
SC486
POWER MANAGEMENT
Layout Guidelines (Cont.)
In Figure 8, all components referenced to VSSA have been placed and have been connected using a 0.020” trace.
Decoupling capacitor C12 is as close as possible to VCCA and VSSA and the VDDP decoupling capacitor C18 is as
close as possible to VDDP and PGND1. The feedback components R5, R8 and C1 along with the VDDQ sense
components, R4 and C2 are also located at the chip and the feedback trace from the VDDQ output should route
from the top of the output capacitors (C13 and C14) in a quiet layer back to these components. In Figure 8, the
VDDQ feedback trace would connect to the red trace.
R4 10R
C2
C1
R5 4k64
1u
no-pop
R8
23k2
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
VDDQ FEEDBACK
+ C13
220u/15m
VDDQ
+ C14
220u/15m
Figure 9: VDDQ Feedback and Sense Components and Feedback Trace
2006 Semtech Corp.
21
www.semtech.com
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