BQ24075: SYSOFF to turn disconnected BAT to VOUT (don' have DC input in Vin pin)

KUO LEO

Part Number: BQ24075

I saw about 2V at the OUT when OUT pin is floating (SYSOFF is high, Battery is attached). When 1 mA loading is applied, the voltage at OUT is dropped to 0V.

What happened?

How do I make OUT pin is 0V without Battery energy loss? (I don't want to loss Battery energy.)

Thanks.

over 6 years ago

0 Raheem over 6 years ago

TI__Mastermind 21590 points

Hello Kuo,
Can you please share your schematic.

0 KUO LEO over 6 years ago in reply to Raheem

Prodigy 40 points

HI Raheem,

Please refer to the attached schematic.

LA4320 02_CHARGER IC.pdf

0 Raheem over 6 years ago in reply to KUO LEO

TI__Mastermind 21590 points

Hello,

This is due to the output capacitor which was charged before you set SYSOFF high. when the capacitor is discharged. In my bench test, i see about 1.8uA leakage on BAT when SYSOFF is high.

Power management

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BQ24075: SYSOFF to turn disconnected BAT to VOUT (don' have DC input in Vin pin)