TPS61310 datasheet(49/57 Pages) TI

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GND

LED1

LED2

LED3

OUT

INDLED

SDA

STRB0

B2:SCL

B3:NRESET

C3: Tx_MASK

D3:STRB1

D4:GPIO/PG

TPS61310, TPS61311

www.ti.com

SLVS978C – MARCH 2010 – REVISED NOVEMBER 2012

LAYOUT CONSIDERATIONS

As 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.

The input capacitor, output capacitor, and the inductor should 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 one of the ground pins of the IC.

To lay out the control ground, it is recommended to use short traces as well, separated from the power ground

traces. This avoids ground shift problems, which can occur due to superimposition of power ground current and

control ground current.

Figure 61. Suggested Layout (Top)

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TPS61310 Datasheet(PDF) 49 Page - Texas Instruments