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TPS61252: Power Save Mode Threshold

Art Mecina
Genius 16505 points
Part Number: TPS61252
Other Parts Discussed in Thread: TPS61253A, TPS61378-Q1, TPS61372

Hello Guys,

Good day.

Our customer wanted to know if the threshold for power save mode of TPS61252 can be adjusted to stay in PWM mode?
If yes, how can he do this? Is it possible to do this by by adjusting the ILIM resistor?

Thanks in advance!

Art

  • 0
    TI__Guru 68495 points

    Hi Art,

    Thank you for posting.  Sorry our experts supporting this device are currently on the national holiday starting today.  I will try to see if I can help answer if you can clarity the question:  Which threshold do you talk about?  I mean which pin voltage or which circuit node voltage?  If I am not able to answer, you may need to wait until the experts come back after Oct 8th.

    Thanks,

    Youhao Xi, Applications Engineering

  • 0 in reply to Youhao Xi
    TI__Genius 16505 points

    Thanks for looking into this Youhao!

    I already relayed your inquiry to our customer. I will let you know once I got their feedback. 

    Customer is actually considering to choose a converter that can be forced into PWM mode - or is PWM only. He was interested initially in the high frequency operation of TPS61252 but if you can suggest another boost converter to look at, would be helpful.

    Art

  • 0 in reply to Art Mecina
    TI__Guru 68495 points

    Hi Art,

    Does the customer concern about the PFM could enter the audible noise frequency range?  If so, you may consider the TPS61253A, which can be configured into ultra-sound mode, maintaining the frequency always above the audible range in PFM. 

    You may find an article published by Yangwei at the following link

    https://e2e.ti.com/blogs_/b/powerhouse/archive/2017/11/27/make-a-boost-converter-quieter

    Thanks,

    Youhao

  • 0 in reply to Youhao Xi
    TI__Genius 16505 points

    Hello Youhao,

    Below are the follow-up inquiry from the customer:

    1) "The  TPS61253A is an interesting part but the voltage isn't high enough. I need 6.5 volts, 80 ma. The 61252 may work okay if I adjust ILIM to keep it out of POWER SAVE mode. is there any other part I should look at?"

    2) Does TI make a boost converter that has a sync input so it can be locked to an external clock? Again 3.2-4.2 V in, 6.5 V 200 ma out. 

    Thanks!

    Art

  • 0 in reply to Art Mecina
    TI__Mastermind 34201 points

    Hi Art,

    1. TPS61252 ILIM pin only sets the input current limit. It won't affect when or if TPS61252 will enter into Power save mode.

    2. TPS61372 could meet your demand that it has a MODE pin so the device could work at forced PWM mode but this device doesn't has clock sync function. TPS61378-Q1 is another option and it has external sync function.