TPS65020RHAR datasheet(44/53 Pages) TI1

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TPS65020RHAR Datasheet(PDF) 44 Page - Texas Instruments

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44 / 53 page

PGND3

VDCDC3

VIN

TPS65020

SLVS607D – SEPTEMBER 2005 – REVISED JANUARY 2016

www.ti.com

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. Take care in board layout to get the specified performance. If the

layout is not carefully done, the regulators may show poor line regulation, load regulation, or both, and stability

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

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

as well as the inductor and output capacitor.

For TPS65020, connect the PGND pins of the device to the PowerPAD land of the PCB and connect the analog

ground connections (AGND) to the PGND at the PowerPAD. It is essential to provide a good thermal and

electrical connection of all GND pins using multiple vias to the GND-plane. Keep the common path to the AGND

pins, which returns the small signal components, and the high current of the output capacitors as short as

possible to avoid ground noise. The VDCDCx line must be connected right to the output capacitor and routed

away from noisy components and traces (for example, the L1, L2, and L3 traces).

11.2 Layout Example

Figure 42. Layout Example of a DCDC Converter

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Product Folder Links: TPS65020

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