LMR54406: Recommendation for target specifications

Jeffrey Chung1

Part Number: LMR54406

Hi TI Power Team,

I'd like to ask you about the devices that can meet the target specifications. Please check an attached requirements below and let me know your recommended devices.

Target Specification.pdf

Regards,

Jeffrey

over 1 year ago

0 Aurora Tie over 1 year ago

TI__Genius 13110 points

Hi Jeffrey,

Does the customer need three buck converters to achieve 12V, -12V, and 5V output respectively? How much safety margin is required for the input voltage? Looking forward to your reply. Thanks.

Aurora

0 Jeffrey Chung1 over 1 year ago in reply to Aurora Tie

Expert 2925 points

Hi Aurora,

Please check my answer below.

Does the customer need three buck converters to achieve 12V, -12V, and 5V output respectively? Yes

How much safety margin is required for the input voltage? There is no specific safety margin for input voltage.

Regards,

+1 Aurora Tie over 1 year ago in reply to Jeffrey Chung1

TI__Genius 13110 points

Hi Jeffrey,

The input voltage margin needs to be confirmed by you and the customer, and different applications require different margins.

For 12V and 5V output, it is generally recommended to choose a 36V withstand voltage chip. You can recommend the following:

For -12V output, in the case of no voltage margin, the input voltage is 24V, and the withstand voltage of the chip must be 36V or above. Use buck to make IBB circuit. If customers feel that the withstand voltage is not enough, they can choose the following two chips with higher withstand voltage.

For the design process of IBB circuit, please refer to AN. Thanks

0184.Create an Inverting Power Supply Using Peak Current Mode Buck Converter.pdf

7612.Working with Inverting Buck_Boost Converters.pdf

Aurora

0 Jeffrey Chung1 over 1 year ago in reply to Aurora Tie

Expert 2925 points

Hi Aurora,

Thanks for your kind response. Let me check with the customer and I will ask you if they have the additional questions.

Regards,

0 Aurora Tie over 1 year ago in reply to Jeffrey Chung1

TI__Genius 13110 points

Hi Jeffrey,

OK~ Got it.

Aurora

0 Jeffrey Chung1 over 1 year ago in reply to Aurora Tie

Expert 2925 points

Hi Aurora,

The customer said that your recommended devices of +/-12V output are not met on their target ripple noise specification. Please check and recommend other devices that can be met on their requirements.

Regards,

0 Aurora Tie over 1 year ago in reply to Jeffrey Chung1

TI__Genius 13110 points

Hi Jeffrey,

None of our products can achieve such a small output voltage ripple. It is recommended that customers add an LDO after our DC/DC converter. Thanks.

Aurora

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LMR54406: Recommendation for target specifications