BQ25872 Datasheet, PDF (62/68 Pages) Texas Instruments – Battery Switch Charger

bq25872
SLUSCQ6 – OCTOBER 2016
www.ti.com
10 Power Supply Recommendations
In order to provide an output voltage on SYS, the device requires a power supply between 3.9-V and 14-V input
with at least 100-mA current rating connected to VBUS or a single-cell Li-Ion battery with voltage > VBATUVLO
connected to BAT. The source current rating needs to be at least 7.5 A to meet the current capability of the
device.
11 Layout
11.1 Layout Guidelines
bq25872 supports up to 7-A charge current. It is very critical to maximize Cu trace of VBUS and VOUT.
Following PCB layout guideline is recommended:
• Use Cu trace of at least 110 mil (2.794 mm) wide for VBUS and VOUT respectively. This allows current flow
evenly through all 7 WCSP solder balls.
• Cu trace of VBUS and VOUT should run at least 150 mil (3.81 mm) straight (perpendicular to WCSP ball
array) before making turns.
• Use as large as possible Cu pour for VBUS and VOUT trace elsewhere.
• Use as large as possible Cu pour for PGND.
• Place decoupling capacitors of VBUS and VOUT as close as possible to the device.
11.2 Layout Example
Figure 63. bq25872 Layout Diagram (Top Layer)
Figure 64. bq25872 Layout Diagram (Mid Layer 2)
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