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TPS62561: TPS62561 and TPS62743 load regulation data

Wayne Wang20
Expert 4360 points
Part Number: TPS62561
Other Parts Discussed in Thread: TPS62743,

Hi team,

My customer is evaluating TPS62561 and TPS62743.

For TPS62561, the input is 3.8V and the output is 3.3V. Customer wants to know the output voltage when @ maximum 600mA output current.

For TPS62743, the input is 3.8V and output is 1.8V and 1.2V. Customer wants to know the output voltage of 1.8V and 1.2V setup when @ maximum 300mA output current.

I searched the datasheet of these 2 devices but only TPS62743 provides the load regulation data under VOUT = 1.8V condition. So could you please help provide the data that customer requires? Do we have a curve to show the relationship between Iout and Vout? Thanks.

Best regards,

Wayne

  • 0
    TI__Intellectual 1780 points
    Hi Wayne,

    I am taking care of this thread. I will get back to you as soon as possible.

    Best regards,
    Omar
  • 0 in reply to Omar Hegazi
    TI__Intellectual 1780 points
    Hi Wayne,

    For the TPS62743, the figure in the DS should be good as a reference. Additionally, Webench can be used to calculate those parameters.
    Furthermore, for the TPS62561, you can use the equations in page 13 of the DS to calculate the parameters you need.

    Best regards,
    Omar
  • 0 in reply to Omar Hegazi
    TI__Expert 4360 points
    Omar，

    For the TPS62743, which figure in the datasheet can be a reference？I didn't find any figure related to the load regulation.

    For the TPS62561, the equation in Page 13 is the output voltage ripple calculation instead of the load regulation.

    Hope you could check it again. Thanks.

    Best regards,
    Wayne
  • 0 in reply to Wayne Wang20
    TI__Intellectual 1780 points

    Hi Wayne,

    Sorry for misunderstanding your request.

    Here is the voltage regulation data for the TPS62561 at Vin = 3.8V and Vout = 3.3V.

    Similarly, here is the graph for the TPS62743 at Vin = 3.8V and Vout = 1.2V

    Best regards,

    Omar

  • 0 in reply to Omar Hegazi
    TI__Expert 4360 points

    Hi Omar,

    Thanks for your reply. But do you have the Vout-Iout curve of TPS62743 @Vin=3.8V and Vout=1.8V? I am asking because the 1.8V output is for a processor and the minimum requirement by the processor for this 1.8V rail is 1.75V.

    So customer also did the test on their own. They use a digital multi-meter to measure the VOS pin voltage. They keep monitoring the VOS voltage as they increase the output current with a electronic load. They found that when the VOS drops down to 1.75V, the output current is only about 200mA. But according to our datasheet, the load regulation data is 0.001%/mA. This is not matching with the test phenomenon. So do you have any advice on this? If you could provide the Vout-Iout curve@Vin=3.8V and Vout=1.8V, that could be a reference. Thanks.

    Best regards,

    Wayne

  • 0 in reply to Wayne Wang20
    TI__Intellectual 1780 points

    Hi Wayne,

    Thanks for the clarification.

    I, unfortunately, do not have validation data for Vout=1.8 at the moment. However, I went to the lab today and I checked the device at the conditions you mentioned: Vin=3.8V, Vout=1.8V, Iout=300mA, and the device operated as expected and described in the DS. The load current was increased from 60uA gradually to 310mA and no abnormalities were found with voltage regulations. Here is a waveform for the measurements:

    I am not sure where the source of the issue would be at the customer side. Do you have the schematics and the layout of the design?

    Maybe they can also try a different way of drawing current (a different electronic load maybe, etc.)

    Best regards,

    Omar

  • 0 in reply to Omar Hegazi
    TI__Intellectual 1780 points
    Hi Wayne,

    I am just following up with this you on the voltage regulation issue your customer is facing.
    Were you able to solve it?

    Best regards,
    Omar