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Forum Help with schematic for TI TPS61202
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Related

Help with schematic for TI TPS61202

jgreenb8@gmail.com
jgreenb8@gmail.com over 9 years ago

Hello, this is one of my first posts so hopefully this makes it to the right section and group.

 

ive been developing a transmitter that runs from a 3.7v lipo battery. to do this I used a boost IC breakout from spark fun: https://www.sparkfun.com/products/10255  . This has worked very well and now I've made my own PCB that integrates the design with the updated schemaric I've attached.

 

Many problem is that when populated with components it outputs 6.8V, not the 3.3V that i expected. anyone know what I'm doing wrong?

 

I've checked the data sheets but I can't tell why it is doing this. I hand soldered these, would it be possible that i may have damage the chip during assembly?

 

I couldn't find this chip in a more solder ready package, does anyone else have experience with a voltage regulator that works well with 3.7V in to 3.3V out? Not much overhead.

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  • jgreenb8@gmail.com
    jgreenb8@gmail.com over 9 years ago in reply to bwelsby +2
    Seconds before but your answer was just as correct. thank you!
  • bwelsby
    bwelsby over 9 years ago +1
    Although I have not used these devices I just checked the datasheet. Can you confirm the chip you are using is a TPS61200 and not the TPS61202 as mentioned in the title. The TPS61202 is a fixed 5V output…
  • bwelsby
    bwelsby over 9 years ago in reply to shabaz +1
    you posted your response seconds before me..
  • shabaz
    0 shabaz over 9 years ago

    Hi Jacob,

     

    The '202 isn't a 3.3V output device (nor an adjustable one), it is a 5v output device, and needs the FB pin connected directly to Vout to see the correct voltage (5V). This would explain why you're seeing a higher-than-5V output.

    Did you mean to use the '200 device? (adjustable) or the '201 (3.3V)?

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  • bwelsby
    0 bwelsby over 9 years ago

    Although I have not used these devices I just checked the datasheet.  Can you confirm the chip you are using is a TPS61200 and not the TPS61202 as mentioned in the title.

     

    The TPS61202 is a fixed 5V output and FB would be connected directly to VOUT  for this, no R10 and R11 on your schematic.  In a similar way a TPS61201 is 3.3V fixed output.

    The TPS61200 requires the resistors as the output is adjustable.

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  • bwelsby
    0 bwelsby over 9 years ago in reply to shabaz

    you posted your response seconds before me.. image

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  • jgreenb8@gmail.com
    0 jgreenb8@gmail.com over 9 years ago in reply to shabaz

    aaaahhhh... Crap. You're right I looks at my BOM and I ordered the TPS61202 by mistake. i need the 3.3V output and I was mistaken that they were all programmable so I selected the voltage divider to give me a feedback for 3.3V.

     

    Ok, that being Known. If I order the TPS61200 it should drop into the same schematic and give me the right voltage, correct?

     

    in the future I could save myself the board space in passive a and go with the TPS61201.

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  • jgreenb8@gmail.com
    0 jgreenb8@gmail.com over 9 years ago in reply to bwelsby

    Seconds before but your answer was just as correct. thank you!

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  • shabaz
    0 shabaz over 9 years ago in reply to jgreenb8@gmail.com

    Hi Jacob,

     

    If I order the TPS61200 it should drop into the same schematic and give me the right voltage, correct?

    Correct it should work with the '200 (provided the resistors are right). As you say, the adjustable is fine (but the fixed one would save the resistors).

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  • bwelsby
    0 bwelsby over 9 years ago in reply to jgreenb8@gmail.com

    No problem, glad you are sorted.

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