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LP87564-Q1: LP87564-Q1-Request for Schematics Review

Part Number: LP87564-Q1

Dear Team,

I have done a quad power rail design using LP87564-Q1 PMIC.I have attached schematics snaps design and below mentioned design requirement.
Request you to review and provide if any feedback on this design?

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Design Requirement
Vin=5V
Output Voltage :
Channel 1: 0.88V 3.2A
Channel 2: 1.8V 2.2A
Channel 3: 1.5V 1.1A
Channel 4: 2.5v 1A

Vout ripple 

Regards,
Sujith M

  • Hi Sujith,

    I will review your design and provide feedback by EOB tomorrow.

    Kind regards,

    Conner Gillette

  • My apologies for the delay Sujith. The orderable part on your schematic is the LP87564T, which has a default setting of output voltages 1.1V, 1.1V, 1.0V, and 1.1V for Bucks 0 through 3, respectively. Were you planning on using a different orderable part, or using I2C transactions to change the rail voltages after device power on?

    Regards,

    Conner

  • HI Conner,

    I need PMbus/I2C controllable Power device , All individual power rails current monitoring (telemetry) feature should support.
    Is there any possible way to configure Vout using Hardware strap option.?

    Regards,
    Sujith M

  • For the LP87564-Q1 part family, the default output voltage values of each rail upon initial power-up are determined by One-Time Programmable bit values (OTP), which are programmed in the factory. Each unique orderable part, e.g. LP87564T, has its own unique OTP settings. These values can be changed after the PMIC boots using an I2C transaction, but when the PMIC power cycles you would need to send another I2C transaction to change the rail voltage again. For this part family, there is no hardware configurability of the output voltages.

    Kind regards,

    Conner Gillette

  • Hi Conner Gillette,

    Thanks for your reply.

    e.g. LP87564T, has its own unique OTP settings. These values can be changed after the PMIC boots using an I2C transaction, but when the PMIC power cycles you would need to send another I2C transaction to change the rail voltage again. For this part family, there is no hardware configurability of the output voltages

    Im ok with LP87564T part.Could you please review the scheatics and provide your feedback.?
    Also i would like to know the how to set OTP for my design requirement, is this device can be configured and controlled via any GUI Software ?

    Regards,
    Sujith M

  • Hi Sujith, I am almost done with your schematic review and will post it by EOD today. As far as a new OTP, that would require a new orderable device. I can get you in touch with our Product Marketing Engineer to discuss business justification for a new orderable device.

    Regards,

    Conner

  • Thank you for your patience Sujith. I have reviewed the schematic and found no issues.

    Kind regards,

    Conner Gillette

  • Hi Conner,

    As far as a new OTP, that would require a new orderable device

    Why we need to use new device, i understand OTP can be load through I2C control?

    If not please share the ordering part number for my requirement? i Hope schematics design and footprint remain same, only device part number is varying?

    Design Requirement
    Vin=5V
    Output Voltage :
    Channel 1: 0.88V 3.2A
    Channel 2: 1.8V 2.2A
    Channel 3: 1.5V 1.1A
    Channel 4: 2.5v 1A

    Regards,
    Sujith M 

  • Hi Conner,

    Thanks for your review.

    Thanks,
    Sujith M

  • From Wikipedia:

    "OTP (one time programmable) memory is a special type of non-volatile memory (NVM) that permits data to be written to memory only once. Once the memory has been programmed, it retains its value upon loss of power (i.e., is non-volatile). OTP memory is used in applications where reliable and repeatable reading of data is required. Examples include boot code, encryption keys and configuration parameters for analog, sensor or display circuitry. OTP NVM is characterized, over other types of NVM like eFuse or EEPROM, by offering a low power, small area footprint memory structure. As such OTP memory finds application in products from microprocessors & display drivers to Power Management ICs (PMICs)."

    To elaborate/clarify, the OTP are the settings that the PMIC loads upon boot. You can configure the settings after boot using I2C, however the boot settings are loaded from OTP and the OTP is programmed in factory. Each orderable part number have unique OTP settings.

    You can select a part that uses the EN pin to disable/enable the bucks. Upon boot, you can pull EN low (disabling the rails), change the settings via I2C, then pull EN high to enable your rails.

    Kind regards,

    Conner Gillette

  • Hi conner,

    I understand the logics. Could you please share the ordering part number with suitable OTP for my below requirement? i Hope schematics design and footprint remain same, only device part number is varying?

    Design Requirement
    Vin=5V
    Output Voltage :
    Channel 1: 0.88V 3.2A
    Channel 2: 1.8V 2.2A
    Channel 3: 1.5V 1.1A
    Channel 4: 2.5v 1A

    Regards,
    Sujith M

  • What SoC are using this to power? This will allow me to also check if power sequencing meets your requirements too.

    -Conner

  • Hi Conner,

    1. This will be used to power up the peripheral interfaces, i don't see any specific power sequence requirements for interfaces IC like ethernet PHY, SD.. etc. Hence we can enable all power rails together once VCC input supplied. I hope if required power sequence we can control via buck enable pin.
    2. One more doubt, once we use OTP loaded device. Can we able to trim the voltage of individual channel via I2C?

    Thanks,

    Sujith 

  • We do not have a released part that has the rail configuration you need.

    2. You can change the voltage output values via I2C after OTP is loaded, yes.

    Kind regards,

    Conner Gillette

  • Hi Conner,

    The problem is PMIC channel 1 voltage rail is1.1V as per device OTP settings. But we need 0.88V for core voltage of Ethernet Phy device.
    Can i use same part LP87564T if we follow below procedure?

    1) PMIC all buck ENABLE PIN= Low
    2)Power ON the PMIC change all BUCK output to required voltage level via I2C control
    3)Enable the PMIC output 

    Does this device support below features? stroring all register content into EEPROM ?

    Regards,
    Sujith M

  • Yes, you can follow that procedure to obtain the necessary output for your rails before enabling them. This would allow you to use the part LP87564T for your application.

    No, the device does not support the STORE_DEFAULT_ALL or the STORE_USER_ALL features.

    Kind regards,

    Conner Gillette

  • Hi Conner,

    Thanks for confirming.
    Please confirm the I2C address of this device? is it 0x 66?
    I would like to understand is there any way to control the device via GUI software for Testing and I2C programming ?for initial testing dont have any host processor for I2C programming.I have to use external adapter for programing the device.
    Can i use Aardwark I2C/SPI host adapter for 
    programming?

    Thanks,
    Sujith M

  • The I2C address of this part is 0x65. You can use the LP8756 GUI to communicate with the EVM. You can also use it with your own board, but you will likely need an I2C to USB adapter (Your aardvark adapter should work). If you don't have a processor to send commands to the GUI, then you will need to send the I2C transactions directly to the PMIC using your Aardvark.

    Kind regards,

    Conner Gillette

  • Hi Conner,

    Thanks for confirming.

    I have checked this device specification with my internal team , the think is like we need this part with default POWER ON voltage should be as per schematics requirement.
    As a special request, could you please check with your factory and help me to get same part, which is factory programmed by my required voltage?

    or 

    Can i get the same device with Blank EEPROM (without OTP) and please let me know the procedure to generate the OTP and loading to device?

    Thanks,
    Sujith M

  • Hi Sujith,

    I order to determine business case for a custom part, could you please provide the below information? There is no issue if there are any fields you are unable to fill out.

    Customer

     Adtran

    First Sample Need Date and Volumes

     

    End Equipment

     

    PMIC Device

     LP8756

    SoC / Processor

     

    Start of Production (SOP)

     

    RTM Need Date

     

    Business Case (Annual Volume, Project Lifetime # years)

     

    Kind regards,

    Conner Gillette

  • Hi Conner,

    Please find my replay below.

    Customer

     iWave Systems Technologies Pvt Ltd

    First Sample Need Date and Volumes

     20/03/2023
    Sample Qty:20

    End Equipment

     Video Conversion Equipment

    PMIC Device

     LP8756

    SoC / Processor

     

    Start of Production (SOP)

     Q4 2024

    RTM Need Date

     01-12-2024

    Business Case (Annual Volume, Project Lifetime # years)

    May i know the price of customized PMIC ?  

    Regards,
    Sujith M

  • Hi Sujith,

    The price depends on this business case section as there are certain requirements that must be met for a custom part. If you could provide this it would be most helpful to relay with the experts that can decipher and provide the desired information for you. If you feel more comfortable sharing this information via email please reach out to me at f-tolson@ti.com. But I will reach out to the corresponding experts to discover what information or start the process as far as I can accordingly.

    I also wanted to verify that the dates and years you provided above are correct? 

    Thanks,
    Field