TPS2500 datasheet(22/43 Pages) TI2

22 / 43 page

TPS2500, TPS2501

SLVS886C – OCTOBER 2008 – REVISED AUGUST 2010

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Grounding is an important part of the layout. The device has a PGND and a GND pin. The GND pin is the quiet

analog ground of the device and should have its own separate ground pour; connect the quiet signals to GND

including the RILIM resistor and any input decoupling capacitors to the GND pour. It is important that the RILIM

resistor be tied to a quiet ground to avoid unwanted shifts in the current-limit threshold. The PGND pin is the

high-current power-stage ground; the ground pours of the output (AUX) and bulk input capacitors should be tied

to PGND. PGND and GND should to be tied together in one location at the IC thermal pad, creating a star-point

ground.

The output filter of the boost converter is also critical for layout. The inductor and AUX capacitors should be

placed to minimize the area of current loop through AUX–PGND–SW.

The layout for the TPS2500EVM evaluation board (HPA337) is shown in Figure 21 and should be followed as

closely as possible for best performance. The key components are inside the white silkscreen box.

Figure 21. Recommended Layout, TPS2500EVM (HPA337) Evaluation Board

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TPS2500 Datenblatt(PDF) 22 Page - Texas Instruments