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Recommendation of highest precision Buck or LDO

Fandy
Expert 2285 points
Other Parts Discussed in Thread: TPS62147

Hello 

Please help recommend highest precision Buck or LDO ;

Two demand: 1) 7V-->4.6V/290mA ;    2)7V-->4.6V/800mA

Please recommend P/N with hihghest accuracy and lowest temp drift .I could find TI LDO highest accuracy is 0.75%,  no data shows TI's Buck accuracy in Website

  • 0
    TI__Guru**** 150900 points
    Hi Fandy,

    The TPS62147/8 can meet your power needs and provides 1% accuracy over its whole -40C to 125 C temp range.
  • 0
    TI__Mastermind 35210 points
    Hi Fandy,

    For your first application(7V-->4.6V/290mA ), I could recommend using a LDO. Here is an example that might fit your application: www.ti.com/.../tps745
    For your second application (7V-->4.6V/800mA), I would recommend using a buck. If you were to select an LDO you would be burning quite a bit of power in it and would have to appropriately manage the thermals. With high-efficiency buck converters, thermals can be less of a concern. An example buck converter for your application: www.ti.com/.../tlv62150a.pdf

    The accuracy figure I think you are looking for with a buck converter is "line regulation." This specific converter's line regulation spec is .02 %/V.
    Keep in mind that the accuracy of the converter can also be affected by the external components of the converter, for example, the temperature coefficient of the feedback resistors that set the output voltage can affect the output voltage over time/temperature.