Datasheet

VIN
VIN
VIN
GND
EN
GND
VSENSE
SS
PH
PH
PH
PWRGD
BOOT
RT/CLK
COMP
AGND
PH
BOOT
CAPACITOR
VOUT
OUTPUT
INDUCTOR
OUTPUT
FILTER
CAPACITOR
SLOWSTART
CAPACITOR
COMPENSATION
NETWORK
TOPSIDE
GROUND
AREA
VIA toGroundPlane
FREQUENCY
SET
RESISTOR
ANALOG
GROUND
TRACE
VIN
INPUT
BYPASS
CAPACITOR
VIN
UVLOSET
RESISTRORS
FEEDBACK
RESISTORS
VIA to
Ground
Plane
EXPOSED
POWERPAD
AREA
TPS54318
www.ti.com SLVS975A –SEPTEMBER 2009–REVISED SEPTEMBER 2013
to a separate analog ground trace as shown. The RT/CLK pin is particularly sensitive to noise so the RT resistor
should be located as close as possible to the IC and routed with minimal lengths of trace. The additional external
components can be placed approximately as shown. It is possible to obtain acceptable performance with
alternate PCB layouts; however, this layout has been shown to produce good results and is meant as a
guideline.
Figure 53. PCB Layout Example
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