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LP5030: Output configurations

Masaru Oinaga
Intellectual 2620 points
Part Number: LP5030
Other Parts Discussed in Thread: LP5861T

Hello, Team,

We have several questions from our customer related to the output capability of LP5040.

  1. The output capability given in the datasheet is 35mA/ch but we think that we cannot output 35mA * 30ch simultaneously because of an internal current-limit; is this correct understanding or can we output 35mA*30ch at once?

  2.  If 1. is correct, how much channel can we output with 35mA? 

  3. We think that we can combine output of 2 channels to output 75mA; is this correct? if so, what do we need to take care when doing this? Would the output timing or PWM configuration have some mismatch?

  4. What would be the alternative of LP5030 with a larger current/ch spec? The number of channels required might change to 18ch but still not fixed. Our customer would like to reuse the software they implemented for LP5030 so if the alternative shares the same I2C config, that would be great.

Best Regards,
Masaru

  • +1
    TI__Genius 15655 points

    Hi Masaru,

    Please refer the comments below:

    1. Yes, LP5030 can support output 35mA*30ch at once.

    3. If one channel is 35mA, then 2 channel will be 70mA. We don't suggest that using LP5030 over 35mA output condition. And yes, due to the internal phase shift function, the output PWM timing will be mismatch. Please refer the below figure. Could you please tell me why you want to keep the same PWM timing for all output?

    4. Actually, LP5030 can support max 75mA per channel, but once the current is over 35mA, we can't make sure the current accuracy and device life time. Therefore, we usually suggest customers use LP50 family under 35mA condition.

    If customers need higher current and below 18ch, I'd like to recommend LP5861T to you. Although the software could be different, but based on the same I2C interface, I think it could be easier to change LP5030 to LP5861T.

    BR, Jared