• State
  • Locked Locked
  • Replies 3 replies
  • Subscribers 63 subscribers
  • Views 948 views
  • Users 0 members are here
Support feedback
Options
Options
Similar topics

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

TPS51225 Max supply current?

Brian Han
Intellectual 330 points
Other Parts Discussed in Thread: TPS51225, TLV320AIC3204

Hell all,

I'm planning to use TPS51225 to convert 7.4V~12V to 5V adn 3.3V.

3.3V will be used for TLV320AIC3204 dsp, but the recommended supply current for this IC was at least 150mA.

In the description, it's saying built in 100mA, 5V and 3.3V LDO, but in the datasheet it seems the current out can go over 100mA for each voltage out.

Is this correct or am I understanding it wrong?

Pleas help.

Thank You

  • 0
    TI__Guru**** 191445 points

    TPS51225 has 4 outputs plus a clock driver for a charge pump  The LDO 3.3V and 5 V outputs are limited to 100 mA.  You may be able to get more current, but it is not guaranteed.  If you want to generate 3.3 v and 5 V from the two switching controllers, it looks like they are rated for 8 A each.

    Maybe TPS51225 is not the best choice for your application.  We have quite a few dual output buck regulators.  What is you required current for your 5 V and 3.3 V supplies?

  • 0 in reply to JohnTucker
    Intellectual 330 points

    Hello John,

    I need 3.3V and 1.8V to power my ICs

    And rough diagram looks like below and the diagram is based on TPS51225.

    If there is a dual controller with 3.3V and 1.8V out, that should be the best fit.

    I need at least 200mA of current for 3.3V and out of 200mA, 150mA is for the TLV320AIC3204.

    for 1.8V, 50mA should be more than enough.

    Could you give me an advice for the most cost effective dual buck controller with an output of 200mA?

    Thank You

  • 0 in reply to Brian Han
    TI__Guru**** 191445 points

    I'm a little confused.   Do you just need 3.3V and 1.8V, or do you need 5 V as well?