LM46000_15 Datasheet, PDF (44/53 Pages) Texas Instruments – LM46000 SIMPLE SWITCHER® 3.5 V to 60 V 0.5 A Synchronous Step-Down Voltage Converter

LM46000
SNVSA45A – JUNE 2014 – REVISED JULY 2014
10.2 Layout Example
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COUT
TO LOAD
VOUT sense point
is away from
inductor and
+ ^{past COUT VOUT}
VOUT distribution
point is away
from inductor
and past COUT
L
Place ^CBOOT
bypass caps
close to
terminals
CVCC
Ground
bypass caps
to DAP
CBIAS
SW
SW
CBOOT
VCC
BIAS
SYNC
RT
PGOOD
As much copper area as possible, for
better thermal performance
1
16
Thermal Vias under DAP
2
15
3
14
4
13
PAD
5
(17)
12
6
11
7
10
8
9
PGND
PGND
VIN
VIN
EN
SS/TRK
AGND
FB
GND
Place ceramic
bypass caps close
to VIN and PGND
CIN
VIN
terminals
RFBB
RFBT
Route VOUT
sense trace
away from SW
and VIN
nodes.
Preferably
CFF
shielded in an
alternative
layer
GND Plane
As much copper area as possible, for better thermal performance
Figure 102. LM46000 PCB Layout Example
44
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