• State TI Thinks Resolved
  • Locked Locked
  • Replies 2 replies
  • Answers 2 answers
  • Subscribers 64 subscribers
  • Views 130 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.

Looking for the vibrator driver IC solution

Andy_Lin
Intellectual 2230 points
Other Parts Discussed in Thread: TPS769

Hi Team,

I'm looking for the vibrator driver IC solution replacement part for MAX1749,

we are used this part for touch screen application ,when people touch the screen , it will trigger the vibrator , like tactile feedback.

however , per my check on the cross reference , our recommendation is LDO TPS769,

is this part ok for driving the vibrating motor? or we have other solution function sames as MAX1749?

kindly provide the suggestion, thanks!

  • 0
    TI__Mastermind 43630 points

    Hi Andy,

    Looking that the datasheet, the only thing I see that makes the Maxim LDO unique is reverse battery protection. If reverse voltage protection is not required, many LDO's seem like they can work. Are they looking for low Iq, fast load transient, or any other special features? Without further information, I would think something like the TPS7A02 or TPS784 could do the job. 

    Let me know what you think.

  • 0
    TI__Mastermind 29350 points

    Hello Andy,

    It looks to me like the MAX1749 is a linear regulator IC.  I cannot locate a direct drop in replacement due to the unique pinout of the MAX1749, however the TPS769 is a capable replacement. The MAX1749 requires an output capacitor with ESR less than 200 miliohms for stability, while the TPS769 requires an output capacitor with an ESR between 200 miliohms and 10 ohms for stability.  This means the TPS769 will likely produce much worse transient performance and require a different type of output capacitor, if that is of any concern to the customer (if the load is steady state or very small transients, then this would not be an issue).

    The TLV740 looks like a better option, and is much cheaper, however it has a 5.5V input voltage maximum rating and the enable pin cannot be toggled more than 10 KHz (which is completely fine for most applications).  The output capacitor selection is like the MAX component but without the ESR restriction.  If the customer can handle the 5.5V input voltage maximum, this newer device is probably a better (and cheaper) solution.

    Thanks,

    - Stephen