TPS61280 Datasheet, PDF (45/58 Pages) Texas Instruments – Low-, Wide- Voltage Battery Front-End DC/DC Converter Single-Cell Li-Ion, Ni-Rich, Si-Anode Applications

TPS61280, TPS61281, TPS61282
www.ti.com
SLVSBI1 – OCTOBER 2013
LAYOUT CONSIDERATIONS
For all switching power supplies, the layout is an important step in the design, especially at high peak currents
and high switching frequencies. If the layout is not carefully done, the regulator could show stability problems as
well as EMI problems. Therefore, use wide and short traces for the main current path and for the power ground
tracks.
To minimize voltage spikes at the converter's output, it is advisable to place the output capacitor(s) as close as
possible to GND and V_OUT, as shown in Figure 53. The input capacitor and inductor should also be placed as
close as possible to the IC. Use a common ground node for power ground and a different one for control ground
to minimize the effects of ground noise. Connect these ground nodes at any place close to the ground pins of the
IC.
Junction-to-ambient thermal resistance is highly application and board-layout dependent. It is suggested to
maximize the pour area for all planes other than SW. Especially the ground pour should be set to fill available
PWB surface area and tied to internal layers with a cluster of thermal vias.
L
Vin
Vout
GND
Figure 53. Suggested Layout (Top)
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