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LMZ14201H: output regulation

Brooks Lind
Prodigy 70 points
Part Number: LMZ14201H
Other Parts Discussed in Thread: LMZM23601, LMZ34202, TPA2005D1, LMZ14201

Can the LMZ14201H be regulated down to 4.2V output ? The input voltage is 12V.

  • 0
    TI__Mastermind 47060 points

    Hi Brooks,

    The LMZ14201H can be configured to go pass the recommended 5V output minimum since the internal reference voltage is 0.8V. However as this is not tested for, you would need to ensure that the stability of the device is operational at lower output voltage with increased output capacitance. 

    If you are using this for a 12V input supply, is there a reason why you are using a 42V max input power module? If youre design criteria is 12Vin/4.2Vout for 1A loading, you can take a look at the LMZM23601 for minimal solution size and high efficiency.

    If you are interested in another high voltage power module that is similar to the LMZ14201H, I'd suggest looking at the LMZ34202. The LMZ34202 should has a max input voltage of 42V and with an output range of 2.5V to 7.5V for 2A applications.

    Regards,

    Jimmy  

  • 0 in reply to Jimmy Hua
    TI__Mastermind 47060 points

    Hi Brooks,

    Do you have any comments or questions pertaining to the above response?

    Regards,

    Jimmy 

  • 0 in reply to Jimmy Hua
    Prodigy 70 points

    Hi,

    Let me give you a little more information.

    We have pre-existing design using the AUDIO Amp TPA2005D1 with a 4 ohm speaker load.

    The TPA2005D1 can only handle 4 ohms load with the  VDD voltage range of 2.5V to 4.2V. 

    If using 5V for VDD ,only a 8 ohm load is recommended.

    We are using the LMZ14201H to supply the TPA2005D1 VDD.

    Without having to change the PCB layout was thinking could use the LMZ14201TZ-ADJ/NOPB.

    Would that be a direct drop-in replacement for the  LMZ14201HTZX/NOPB ? Couldn't figure out what the alphabet soup means after the LMZ14201XXXX ?

    We will be taking a look at a different solution when we redesign the board soon. . Automotive grade part is preferred any suggestions is appreciated. 

    Thanks Brooks

  • 0 in reply to Brooks Lind
    TI__Mastermind 47060 points

    Hi,

    Thanks for additional information and clarification.

    The LMZ14201H is pin-to-pin compatible with the LMZ14201. This enables you to drop either new devices in your current design without changing PCB layout. Again I'd like to emphasis that though I think the LMZ14201H can regulate at a lower voltage than the 5V, it is not something that has been tested for internally at TI so you would need to make sure it is operationally stable across your desired input voltage range and load current. 

    The suffix at the end of the part number decodes the quantity of the order-able reel. In this case looking at the datasheet for the LMZ14201H on page 28 you could see that the LMZ14201HTZ/NOPB refers to a quantity of 250 pieces while LMZ14201HTZX/NOPB refers to a quantity of 500 pieces. 

    Currently the power module portfolio does not have any automotive Q-grade parts. I would suggest going on the TI buck converter landing page and search filtering for automotive grade devices.

    Regards,

    Jimmy