BQ25071-Q1 Datasheet, PDF (18/22 Pages) Texas Instruments – Automotive Qualified

bq25071-Q1
SLUSCD6 – APRIL 2016
www.ti.com
10 Power Supply Recommendations
In a typical application, the system is powered by a USB port or USB wall adapter.
The wide input voltage range supports low cost and unregulated adapters.
The minimum input voltage - where the charging process starts with a reduced charging current - could be 3.75
V when the battery voltage is below 3.5 V. The minimum input voltage can be up to 3.875 V when the battery is
close to be fully charged (Please refer to the Sleep Mode) or there is no battery presented. The maximum
recommended operating input voltage is up to 8 V; the overvoltage protection kicks in at 10.5 V and the
maximum input voltage rating is 30 V Input Rating.
11 Layout
11.1 Layout Guidelines
It is important to pay special attention to the PCB layout. The following provides some guidelines:
• To obtain optimal performance, the decoupling capacitor from IN to GND (thermal pad) and the output filter
capacitors from OUT to GND (thermal pad) should be placed as close as possible to the bq25071-Q1, with
short trace runs to both IN, OUT and GND (thermal pad).
• All low-current GND connections should be kept separate from the high-current charge or discharge paths
from the battery. Use a single-point ground technique incorporating both the small signal ground path and the
power ground path.
• The high current charge paths into IN pin and from the OUT pin must be sized appropriately for the maximum
charge current in order to avoid voltage drops in these traces.
• The bq25071-Q1 is packaged in a thermally enhanced SON package. The package includes a thermal pad to
provide an effective thermal contact between the IC and the printed circuit board (PCB); this thermal pad is
also the main ground connection for the device. Connect the thermal pad to the PCB ground connection. Full
PCB design guidelines for this package are provided in the application note entitled: QFN/SON PCB
Attachment Application Note (SLUA271).
11.2 Layout Example
The bottom plane is a ground plane that is connected to the top through vias.
18
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