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TPA3250: TPA3250 DVDD internal regulator, maximum output current ?

Part Number: TPA3250
Other Parts Discussed in Thread: TPS65133

Hi,

i plane to use TPA3250 audio amplifier. This chip contains 2 voltage regulators DVDD = 3V3 & AVDD =7V8. I'm looking to use DVDD's regulator to power some externals components. Could you tell me what is the maximum current we can sink, i can't find this value in the datasheet ?

Externals components : TPS65133 (5/10mA) to produce +/-5V which powered 2 x DG403 (<1mA)

Thanks,
regards,
Julien

  • Hello Julien, 

    I understand what you are trying to do as this would not require your system to have voltage regulators and lower the cost of the overall solution. 

    However, this is not recommended, these pins are for voltage reference only for the TPA3250. 

    In the datasheet it is outlined in section 10.2.1.2 on page 22: "The DVDD and AVDD pins are not recommended to be used as a voltage sources for external circuitry."

    Additionally in section 11.1.1 on page 28 of the datasheet:"These linear regulators are internally connected to the VDD supply and their outputs are presented on AVDD and DVDD pins, providing a connection point for an external bypass capacitors. It is important to note that the linear regulators integrated in the device have only been designed to support the current requirements of the internal circuitry, and should not be used to power any additional external circuitry. Additional loading on these pins could cause the voltage to sag and increase noise injection, which negatively affects the performance and operation of the device."

    All the best,

    Carolina

  • Hi Julien,

    We don't put the maximum current the DVDD can sink because we designed the part to only have enough to power the device itself. I highly recommend you don't use DVDD to power other components. 

    Best Regards,

    Robert Clifton

  • Oh sorry, I didn't read section 11.1.1 on page 28 correctly. I understand that it is not possible to power other components.
    Thank you,