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TPS61023: No recovery after Disable

Schroedinger Karl
Prodigy 130 points
Part Number: TPS61023
Other Parts Discussed in Thread: TPS63060, , TPS61230A, BQ24179

I tested the part  at about 1A output load, 3.5V in (1 LiIon cell) and 5V out. After EN off and on (while load stays on) the part shows only 0.2V output voltage - it does not recover the voltage. After reducing output current to below 100mA it recovers fully. Is there a possibility to achieve full recovery at high load currents (while not removing the load)? Or can you recommend another (similar small) part which does. E.g. the TPS63060 does but has not the requested performance (3V input at 5V and 1.5A output). 

  • 0
    TI__Mastermind 34201 points

    Hi Karl,

    TPS61023 cannot startup correctly with a 1A constant current load. At the beginning of the soft-start, the TPS61023 charges the output capacitors with a current of about 350mA when the output voltage is below 0.4V. When the output voltage is charged above 0.4V, the output current is changed to have output current capability to drive the 2ohm resistance load.

    May I know what is the post-stage circuit of TPS61023? Normally the post-stage circuit only starts working and drawing current at certain voltage. So it will not perform like a 1A constant load current when voltage is low. 

  • 0 in reply to Zack Liu
    Prodigy 130 points

    The circuit drives an USB-output from a LiIon battery thus the post stage can be everything. Normally after shut done such a load (connected to the USB, e.g. a smartphone) will turn off and the boost controller can  start up - but you never know what customer connect  ...

    Another question: is the TPS61230A similar ?

    Thanks

  • 0 in reply to Schroedinger Karl
    TI__Mastermind 34201 points

    Hi Karl,

    The post stage circuit also have a minimum working voltage range. For example, if the USB-output is connected to a smartphone and the internal BQxx charger device (e.g. BQ24179) only works when input voltage is higher than 3.6V. You cannot use a constant load current model at startup as the real post stage model.