RT/CLK

GND

PVIN

VIN

VSENSE

COMP

SS/TR

EN

PH

BOOT

PWRGD

GND

PVIN

PH

PH

EXPOSED THERMAL

PAD AREA

COMPENSATION

NETWORK

BOOT

CAPACITOR

PVIN

INPUT

BYPASS

CAPACITOR

VOUT

TOPSIDE

GROUND

AREA

VIA toGroundPlane

OUTPUT

INDUCTOR

OUTPUT

FILTER

CAPACITOR

FREQUENCY SET RESISTOR

SLOWSTART

CAPACITOR

ANALOGGROUND TRACE

VIN

INPUT

BYPASS

CAPACITOR

VIN

PVIN

UVLOSET

RESISTORS

FEEDBACK

RESISTORS

EtchUnderComponent

0.010in.Diameter

ThermalVIA toGroundPlane

TPS54521

SLVS981C – JUNE 2010 – REVISED AUGUST 2013

www.ti.com

Figure 55. PCB Layout

Estimated Circuit Area

The estimated printed circuit board area for the components used in the design of Figure 34 is 0.5 in2 (323 mm2).

This area does not include test points or connectors.

32

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