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TPS659113 V5IN pin

first_name last_name20
Prodigy 50 points
Other Parts Discussed in Thread: AM3874

In the Mistral development kit for AM3874  is used TPS659113.

According to the description pin V5IN consumes current less than 1mA, other supply pins can be powered from 3.3V.

Is it possible to implement the scheme with a chip TPS659113 using only 3.3V power supply?

If not, could you recommend a solution for the AM3874 processor and memory DDR3 using only 3.3V external power supply?

  • 0
    TI__Genius 16870 points

    Hi, 

    The V5IN supplies the 5V to drive the external FETs for the controller. The device was designed for external FETs that require VGS=5V for proper turn on with a low Rds(on)  value. This input is spec'd at minimum 4.5V. So, the controller might be designed to only operate with a 5V supply. 

    I also recommending reading the comparator section in the datasheet on pages 49 and 50 to determine if you can live with the changes there too. 

    Lastly, the LDOs will have some unavoidable drop across them. Thus, supplying only 3.3V input will yield output voltages lower than 3.3V at higher currents. 

  • 0 in reply to Michael Green
    Prodigy 50 points

    But Kontron module SMARC-sA3874 contains a chip TPS6591104EA2ZRC/R in the Major Components BOM (information from user guide) and in the power section reads as follows: "The ULP-COM sA3874i module operates over an input voltage range of 3.1V to 5.25V. Power is provided from the carrier through 10 power pins as defined by the ULP-COM specification."

    What is the difference?