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TPS54880 Datasheet(PDF) 11 Page - Texas Instruments

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Part # TPS54880
Description  4-V TO 6-V INPUT, 8-A OUTPUT TRACKING SYNCHRONOUS BUCK PWM SWITCHER WITH INTEGRATED FETs (SWIFT) FOR SEQUENCING
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

TPS54880 Datasheet(HTML) 11 Page - Texas Instruments

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TPS54880
SLVS450A − OCTOBER 2002 REVISED APRIL 2005
www.ti.com
11
LAYOUT CONSIDERATIONS FOR THERMAL
PERFORMANCE
For operation at full rated load current, the analog ground
plane must provide an adequate heat dissipating area. A
3-inch by 3-inch plane of 1 ounce copper is recommended,
though not mandatory, depending on ambient temperature
and airflow. Most applications have larger areas of internal
ground plane available, and the PowerPAD must be
connected to the largest area available. Additional areas
on the top or bottom layers also help dissipate heat, and
any area available must be used when 8 A or greater
operation is desired. Connection from the exposed area of
the PowerPAD to the analog ground plane layer must be
made using 0.013 inch diameter vias to avoid solder
wicking through the vias. Eight vias must be in the
PowerPAD area with four additional vias located under the
device package. The size of the vias under the package,
but not in the exposed thermal pad area, can be increased
to 0.018. Additional vias beyond the twelve recommended
that enhance thermal performance must be included in
areas not under the device package.
Connect Pin 1 to Analog Ground Plane
in This Area for Optimum Performance
Minimum Recommended Top
Side Analog Ground Area
0.3478
0.0150
0.06
0.0256
0.1700
0.1340
0.0630
0.0400
Ø0.0180
4 PL
0.2090
Ø0.0130
8 PL
Minimum Recommended Exposed
Copper Area for Powerpad. 5mil
Stencils May Require 10 Percent
Larger Area
0.0650
0.0500
0.0500
0.0650
0.0339
0.0339
0.0500
Minimum Recommended Thermal Vias: 8 x 0.013 Diameter Inside
Powerpad Area 4 x 0.018 Diameter Under Device as Shown.
Additional 0.018 Diameter Vias May Be Used if Top Side Analog Ground
Area Is Extended.
0.3820
Figure 10. Recommended Land Pattern for 28-Pin PWP PowerPAD


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