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TPS62730 application question?

Chen Bogey8
Mastermind 9990 points
Other Parts Discussed in Thread: TPS62730, CC430F5137

Dear Sir

 TPS62730. 

    We tried to achieve low battery detection functionality. I saw that the chip has STAT pin, when bypass mode is off, it will indicate whether the Vout is above Vtstat threshold or not. Based on the datasheet, Vtstat of TPS62730 is 2.10V (please correct me if I'm wrong), and CC430F5137 could take input voltage from 1.8V-3.6V (CPU side) and 2.0V-3.6V (Radio side). Which means, in my assumption, even that the Vout of TPS62730 is already below 2.10V, the system could still work, and it could be indication as low battery status based on the raising of STAT pin. Am I right?

                                                                                                           Best regards,

                                                                                                                               Bogey

  • 0
    TI__Expert 7110 points
    The STAT pin is pulled low, once the output is above 2.1V (*0.95) and is not in bypass mode. Therefore the pin is high-impedance once the device is in bypass or when VIN is smaller than VOUT.

    I hope I got your idea:
    If the Device is always in Buck mode, the STAT pin will always be low. Once the battery voltage falls below 2.1, the output will follow the input and STAT goes high impedance. This will give you an indication that VBAT is smaller than 2.1V.
    The key is that the device always has to be in buck operation mode!