BQ24232HA Datasheet, PDF (30/36 Pages) Texas Instruments – USB-Friendly Lithium-Ion Battery Charger

bq24232HA
SLUSCG4 – MAY 2016
10 Layout
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10.1 Layout 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) must be placed as close as possible to the bq24232HA, with
short trace runs to both IN, OUT, and GND (thermal pad).
• All low-current GND connections must 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 the 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 bq24232HA is packaged in a thermally enhanced MLP 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 report entitled: QFN/SON PCB
Attachment (SLUA271).
10.2 Layout Example
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