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BQ25606: Uninterruptable power supply

Maik Ackerschott
Prodigy 40 points
Part Number: BQ25606

Hello,

I have the BQ25606 in use for a mobile application (remote control). Actually I've a problem that when I disconnect the remote from the charge socket the voltage drops for 40ms until the boost mode deliver voltage.

Which work around is useful to bridge the time between disconnection and starting from boost mode?

I've tried to connect a diode from Bat to VBUS, but the boost mode doesn't start because the voltage at VBus is to high.

  • 0
    TI__Expert 5590 points

    Hi:

    Can I know a little more about your power system? Do you have a battery in your remote? How your remote, battery charger and battery are connected?

  • 0 in reply to Hong Mao
    Prodigy 40 points

    Hi,

    yes you can.

    I've connected a LiIon battery (3,6V) to the BQ25606. With the voltage generated by the bq25606 or supplied from the charger I deliver this voltage to the remote circuit .

    When the remot is inserted into the charger the remote circuit will be powerd from the charger. When the remote is disconnected from the charger the voltage will be generated from the LiIon battery and the bq25606 to the remote circuit.

    The bq25606 is a part of the remote control.

  • 0 in reply to Maik Ackerschott
    TI__Expert 5590 points
    Hi Maik:

    We have 30ms delay from charge mode to Boost mode. Besides, the boost cannot start until the VBUS voltage is lower than BAT voltage.
    What is lowest voltage do you need for remote? Did you connect your remote to VBUS or PMID pin? What is maximum glitch time allowed from charger to Boost mode? You may email me at h-mao@ti.com for more detailed discussion.