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Original question:

VLDO1 doesn't come out with VSYS and the device cannot enter "active" mode

TPS65217: LDO output and PB_IN

Jeff Xie
Intellectual 1780 points
Part Number: TPS65217

Hi team,

1. If TPS65217C uses the following connection, will LDO has no output?

2. Can PB_IN button still be shut down by pressing the button for 8S?

  • 0
    TI__Mastermind 30280 points
    This cell in the table that you have highlighted is specifically for "initial power-on".

    It is saying that when you apply power at the BAT pin, LDO1 will not power-on immediately. Rather, LDO1 will wait until PB_IN toggles low to turn on. This is a power-saving feature that is implemented when the BAT pin is the only source of power to the system: it will not turn on until the push-button is pressed. This would conserve battery life in a battery-powered system.

    It is also a cautionary statement that you cannot simply short PB_IN to ground, because it is intended to be a physical push-button that will toggle high-low-high when it is pressed. If you were to short PB_IN to GND, a reset would occur every 8 seconds.

    If you do not want to use a physical push-button at PB_IN, you can connect this pin to PGOOD. PGOOD will go low during power-on, which is seen as a push-button press. Then the power-on sequence will occur, and PGOOD will go high. This will prevent a reset after 8s.