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LM5002: Question to DC/DC regulator // The request is sensitive - please don't publish

Harald Reichert
Prodigy 30 points
Part Number: LM5002
Other Parts Discussed in Thread: LM5118, LM3481

Hello TI Team,

 

I have following request for a power supply.

Input voltage range of 9..42 V DC.

The output voltage is 12 VDC. Following the requirements of the regulator:

 

Vin:        9..42 V DC (buck-boost is needed)

Vout:    12 VDC

Iout:      300 mA

Enable Pin

Fsw:      > 800 kHz (synchronization with other switching regulator (800 kHz) should be possible)

Soft Start helpful

 

I selected the LM5002 (datasheet: http://www.ti.com/lit/ds/symlink/lm5002.pdf) because the device looked ok.

Is the LM5002 suitable for this application and can you send me proposal for external components?

 

If there is a better solution, please let me know.

 

As this request is a customer request to me; please don't publish the request.

 

Best regards / Viele Grüße,

Harald

EBV Elektronik

  • 0
    TI__Mastermind 34231 points
    Hi Harald,

    I don't understand why you choose the boost converter LM5002 because you are trying to find a buck-boost converter.
    Do you mean the input voltage range is 9-42V and output voltage is 12V@0.3A? Rightnow

    Regards,
    Zack
  • 0 in reply to Zack Liu
    Prodigy 30 points
    Hi Zack,

    I selected the LM5002 because it has been mentioned as buck-boost. If I was wrong I need to find another device.

    Input voltage range is 9V...42V and output voltage is fixed 12V @ 0.3A
    Enable Pin is required.
    Fsw should be > 800 kHz (synchronization with other switching regulator (800 kHz) should be possible) and
    Soft Start would be nice.

    What would be the proposal from you?

    Best regards,
    Harald
  • 0 in reply to Harald Reichert
    TI__Mastermind 34231 points
    Hi Harald,

    LM5002 can not be used as buck-boost converter.
    The switching frequency higher than 800kHz will lead to a lower efficiency. I would suggest use a lower fsw.
    You can choose LM5118 buck-boost controller but the maximum fsw is only 500kHz. If you still want a higher fsw, LM3481 can be used as a SEPIC configuration.

    Regards,
    Zack