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TPS65218: In TPS65218 PMIC , Can we source 2mA current from the INT_LDO output- external load of 2mA Opamp

Santosh Bongane
Expert 2120 points
Part Number: TPS65218

INT_LDO is externally loaded by AD8500 buffer op-amp , its Idd supply less than 1mA 

So my question is it advisable to connect INT_LDO to source 1mA current for Om-amp supply

  • 0
    TI__Intellectual 1360 points
    Internal LDO is the reference voltage of our internal analog and digital circuits. You can connect it any load lower than 10mA as long as there as the load is constant without any big transients. General recommend is to avoid adding additional load on this rail.
  • 0 in reply to Jayanth Kruttiventi
    TI__Intellectual 1990 points

    Hi Santosh,

    To follow up on Jay's reply, are you planning on using a backup battery to supply the CC pin on the PMIC? If you are, I would recommend not loading the INT_LDO pin. If not, then it is fine to load the INT_LDO pin. Also something else that needs to be taken into account when loading the INT_LDO pin is the hold up time of INT_LDO. INT_LDO is the power supply for the internal discharge resistors for each of the rails. These help to discharge the outputs of DCDC1-4 and LDO1 until INT_LDO reaches ~1.5V. Increasing the loading on INT_LDO may affect your power down sequence. You can increase your capacitance to the max value of 22uF (~9ms of hold-up time) but this still may not be enough to allow the rails to properly discharge.

    Regards,

    Paul Kundmueller