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TPS65217: load switch working mode LS1/LS2 of TPS6521B

hugo
Intellectual 350 points
Part Number: TPS65217

Hi,

    we want to use LS1/LS2 of TPS6521B as load switch mode so we can get output same as LS1/LS2 input (current input is V_SYS(5V)),but we found that either we configured it as load switch or LDO mode ,its output was 3.3V,  does voltage regulator still work even  LS1/LS2 configured as load switch mode?

thanks

Hugo

  • 0
    TI__Mastermind 30310 points

    Hugo,

    Please refer to section 5 Device Comparison Table on page 4 of the TPS65217 datasheet:

    TPS65217A is pre-programmed with LS1/LS2 configured as load switches.

    TPS65217B is pre-programmed with LS1/LS2 configured as LDO3/LDO4, with both output voltages set to 3.3V

    If you want to use TPS65217B with LS1/LS2 configured as load switches, you need to wire your PCB so that LS1_IN (pin 39) and LS2_IN (pin 42) are connected to VSYS (5V or VBAT) or one of the VDCDCx outputs.

    In addition, you need to write to the DEFLS1 and DEFLS2 registers (addresses 0x14 and 0x15) so that bit 5, LS1LDO3/LS2LDO4 = 0b = FET functions as load switch (LS1/LS2). Changing the data in the register to 0x00 should work because the output voltage should be ignored when configured as a load switch, although TPS65217A has register 0x14 = 0x06 and register 0x15 = 0x15).

    Finally, you need to follow the instructions in section 8.5.2 Password Protection and 8.5.2.2 Level2 Protection because registers 0x14 and 0x15 are Level2 protected registers, according to Figure 29. Register Address Map on page 44 of the TPS65217 datasheet.

  • 0 in reply to Brian Berner
    Intellectual 350 points

    hi, Brian

           we verified your answer it works well.

    Thanks

    Hugo