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LP8866-Q1: LP8866-Q1 deep dive discussion

Part Number: LP8866-Q1

Hi Team,

There is a good new that DIN  LP8866-Q1 !

And customers have the following questions and need help answering,THX

1. What is the IC warranty data from the Tier II supplier and the automotive history of the part?

2.Does the controller IC have any sort of pre-bias limitations that would prevent startup?

3.Is there possible pre-bias  of the output voltage from other circuits?

4.What is the tolerance of the regulator?

5.a) Does the regulator have a built in reset circuit?
   b) Is it compatible with the microcontroller, EEPROM or any other IC/component requirements?

6.Does IC regulator always have a minimum load that is greater than any paths of current injection on the regulator output?

7.Have IC included the bias current into the calculation of power dissipation?

8.Is the regulator capable of driving both DC and transient loading requirements?

9.Are there any slew rate requirements on the power supply input or enable/inhibit inputs?  You may have to verify with the supplier as this is not always specified.  Some IC’s use a fast slew rate to enable their ESD protection circuitry.  It has been experienced that IC’s with this structure can falsely trigger the ESD circuitry and the IC can miss-behave.

  • xiaoguang, please help in this case.

  • 1. What is the IC warranty data from the Tier II supplier and the automotive history of the part?

    [ans] Sorry, this is beyond support. can you help check with Tier II supplier else? 

    2.Does the controller IC have any sort of pre-bias limitations that would prevent startup?

    [ans] The device can startup with pre-bias condition. 

    3.Is there possible pre-bias  of the output voltage from other circuits?

    [ans] It depends on system design. If there is leakage current from other supply, pre-bias may happen. However, i don't think it will happen in this application as the load is LEDs. 

    4.What is the tolerance of the regulator?

    [ans] Current matching 1% (typical).  boost voltage is adaptive controlled. 

    5.a) Does the regulator have a built in reset circuit?

    [ans] The regulator will run into fault recovery mode when there are faults(like ovp_High, boost UVP etc. ) The customer can also control EN pin to reset LP8866. 


       b) Is it compatible with the microcontroller, EEPROM or any other IC/component requirements?

    [ans] Yes. Can refer to Control Interface session in the datasheet for communication with other devices. 

    6.Does IC regulator always have a minimum load that is greater than any paths of current injection on the regulator output?

    [ans] not sure about the question. The controller can run in to light load mode(PFM) mode to make sure output voltage won't rise up too much. 

    7.Have IC included the bias current into the calculation of power dissipation?

    [ans]  when calculate power dissipation, bias current should be considered. The detailed current consumption can be refer to IQ in 6.5 Electrical characteristics session.  

    8.Is the regulator capable of driving both DC and transient loading requirements?

    [ans] Right. please refer to user guide and selection to make sure there is enough output capacitors. 

    9.Are there any slew rate requirements on the power supply input or enable/inhibit inputs?  You may have to verify with the supplier as this is not always specified.  Some IC’s use a fast slew rate to enable their ESD protection circuitry.  It has been experienced that IC’s with this structure can falsely trigger the ESD circuitry and the IC can miss-behave.

    [ans] no requirement. The device The normal scenario means if input voltage has sharp change, it won't trigger any device fault. Please make sure the voltage stress not beyond the spec.