TPS61097A-33

SLVSCF2A – JANUARY 2014 – REVISED DECEMBER 2014

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10 Power Supply Recommendations

The TPS61097A-33 DC-DC converters are intended for systems powered by a single up to triple cell Alkaline,

NiCd, NiMH battery with a typical terminal voltage between 0.9 V and 5.5 V. They can also be used in systems

powered by one-cell Li-Ion or Li-Polymer with a typical voltage between 2.5 V and 4.2 V. Additionally, any other

voltage source like solar cells or fuel cells with a typical output voltage between 0.9 V and 5.5 V can power

systems where the TPS61097A-33 is used. The TPS61097A-33 does not down-regulate VIN; therefore, if VIN is

greater than VOUT, VOUT tracks VIN.

11 Layout

11.1 Layout Guidelines

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 and output capacitor, as well as 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.

The feedback divider should be placed as close as possible to the control ground pin 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.

11.2 Layout Example

Figure 22. Layout Example

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