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TPS7A53: TPS7A53

Part Number: TPS7A53

Hello TI,

1> In case of LDO part TPS7A53 (3A or 4A part), to what voltage Power Good (PG) resistor should be pulled up to? What is recommended? Pull it up to Vin or Vout?

2> When we are driving EN signal of second TPS7A53 from PG signal of first TPS7A53 (for power sequencing) is it OK to have EN signal voltage more than Vin voltage? i.e. Vin = 3.3V and VEN = 5V or Vin = 1.8V and VEN = 3.3V?

Please let me know.

Thanks & Regards,

Prasad Gokhale

  • Hi Prasad,

    1> In case of LDO part TPS7A53 (3A or 4A part), to what voltage Power Good (PG) resistor should be pulled up to? What is recommended? Pull it up to Vin or Vout? *PG is commonly pulled to VOUT. However you can also pull it up to VIN if you wish, but in this case between 0V<VIN<VUVLO the device will not be in control of the PG pin. You can also pull this up to another rail entirely. For example if the TPS7A53 is regulating 1.5V but you have an MCU that has a 3.3V I/O ring, you can pull this up to 3.3V to level shift the output. 

    2> When we are driving EN signal of second TPS7A53 from PG signal of first TPS7A53 (for power sequencing) is it OK to have EN signal voltage more than Vin voltage? i.e. Vin = 3.3V and VEN = 5V or Vin = 1.8V and VEN = 3.3V? *Yes, You can see this from the absolute maximum rating table. There is no dependence on VEN with respect to VIN. If there was it would show that VEN_MAX is VIN+0.3V as shown with respect to SNS and OUT.

     


    I hope this answers your questions. 

  • Thanks John for resolving my query !!