GND

C

OUT

V

OUT

V

IN

U

L

R1

C1

TPS62290, TPS62291, TPS62293

SLVS764F – JUNE 2007 – REVISED JANUARY 2016

www.ti.com

10 Power Supply Recommendations

The TPS6229x devices have no special requirements for its input power supply. The input power supply's output

current needs to be rated according to the supply voltage, output voltage and output current of the TPS6229x.

11 Layout

11.1 Layout Guidelines

As for all switching power supplies, the layout is an important step in the design. Proper function of the device

demands careful attention to PCB layout. Care must be taken in board layout to get the specified performance. If

the layout is not carefully done, the regulator could show poor line and/or load regulation, stability issues as well

as EMI problems. It is critical to provide a low inductance, impedance ground path. Therefore, use wide and

short traces for the main current paths. The input capacitor should be placed as close as possible to the IC pins

as well as the inductor and output capacitor.

Connect the GND pin of the device to the exposed thermal pad of the PCB and use this pad as a star point. Use

a common power GND node and a different node for the signal GND to minimize the effects of ground noise.

Connect these ground nodes together to the exposed thermal pad (star point) underneath the IC. Keep the

common path to the GND pin, which returns the small signal components and the high current of the output

capacitors as short as possible to avoid ground noise. The FB line should be connected right to the output

capacitor and routed away from noisy components and traces (for example, SW line).

11.2 Layout Example

Figure 24. Layout Diagram

18

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