BQ24020_07 Datasheet, PDF (16/22 Pages) Texas Instruments – SINGLE-CHIP, LI-ION AND LI-POL CHARGER IC WITH AUTONOMOUS USB-PORT AND AC-ADAPTER SUPPLY MANAGEMENT (bqTINY-II)

bq24020, bq24022, bq24023
bq24024, bq24025, bq24026
bq24027
SLUS549D – DECEMBER 2002 – REVISED MARCH 2006
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APPLICATION INFORMATION (continued)
• To obtain optimal performance, the decoupling capacitor from V_CC to V_SS and the output filter capacitors from
OUT to VSS should be placed as close as possible to the bqTINY, with short trace runs to both signal and
V_SS pins.
• All low-current V_SS 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 BAT pin is the voltage feedback to the device. It should be connected with its trace as close to the
battery pack as possible.
• The high-current charge paths into IN and from the OUT pins must be sized appropriately for the maximum
charge current in order to avoid voltage drops in these traces.
• The bqTINY-II is packaged in a thermally-enhanced MLP package. The package includes a thermal pad to
provide an effective thermal contact between the device and the printed circuit board (PCB). Full PCB design
guidelines for this package are provided in the application note entitled: QFN/SON PCB Attachment
Application Note (TI Literature No. SLUA271).
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