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LP8758-EA: LP8758-EA default setting

Part Number: LP8758-EA

Dear Expert ,

Good day!

I had some questions about the LP8758-EA , 

1 . Default output voltage .

In the datasheet page 1 , the Device Information table show the Vout0-Vout4 default output voltage is 800mV , but in the register 0x0A-0x11 , the default output voltage is different , Buck0 is 900mV/Buck1 is 1200mV and so on ,  I want to confirm that which one is correct ?  

2. Floor state

For the floor state , does it need to write the voltage setting  data to register once the device is power off-on ?

3. default output change 

Our customer want to change the default output voltage ,they hope to change the Buck0-Buck3 default output voltage , is it possible ?

Best regards

Leon.liu

  • Hello Leon,

    1. The output voltages you listed matches with https://www.ti.com/product/LP8758-E3 ? Are those the samples you are testing?

    2. Yes floor voltage settings need to be written once the device is powered on. 

    3. Yes they can write new voltage settings to the BUCKx_VSET registers. Note once the device is powered down the settings are lost, so they need to be written again after power up. 

    Thanks.

    Regards,

    Tomi Koskela

  • Hello Leon,

      Beside of Tomi's answers, I'd like to add followings:

    1. 0x37 actually set the default voltage at 800mV, but somehow we miss to make the change in the description field. We'll make that change whenever get chance to re-spin the datasheet.
    2. When power the device on with EN pin high, the default voltage level will be set by OTP. If your I2C master doesn't need power from the device; you can hold the EN pin low and do the voltage change by I2C, and then pull the EN pin high to power up bucks with your setting voltage level. 

     Thanks!

     Phil