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| TPS54233-Q1 Datasheet, PDF (18/25 Pages) Texas Instruments – 2-A, 28-V INPUT, STEP-DOWN DC/DC CONVERTER WITH ECO-MODE™ | |||
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TPS54233-Q1
SLUSAZ7A â MARCH 2012 â REVISED MARCH 2012
TOPSIDE
GROUND
AREA
OUTPUT
FILTER
CAPACITOR
Vout
Feedback Trace
Route BOOT CAPACITOR
trace on other layer to provide
wide path for topside ground
CATCH
DIODE
INPUT
BYPASS
CAPACITOR
BOOT
PH
OUTPUT
INDUCTOR
PH
BOOT
CAPACITOR
Vin
VIN
GND
UVLO
RESISTOR
DIVIDER
EN
COMP
SS
SLOW START
CAPACITOR
VSENSE
COMPENSATION RESISTOR
NETWORK
DIVIDER
www.ti.com
Thermal VIA Signal VIA
Figure 13. TPS54233-Q1 Board Layout
Estimated Circuit Area
The estimated printed circuit board area for the components used in the design of Figure 12 is 0.72 in2. This area
does not include test points or connectors.
ELECTROMAGNETIC INTERFERENCE (EMI) CONSIDERATIONS
As EMI becomes a rising concern in more and more applications, the internal design of the TPS54233-Q1 takes
measures to reduce the EMI. The high-side MOSFET gate drive is designed to reduce the PH pin voltage
ringing. The internal IC rails are isolated to decrease the noise sensitivity. A package bond wire scheme is used
to lower the parasitics effects.
To achieve the best EMI performance, external component selection and board layout are equally important.
Follow the Step by Step Design Procedure above to prevent potential EMI issues.
18
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Copyright © 2012, Texas Instruments Incorporated
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