Part number recommendation ：24V input -15V output 100mA load current

Zhihong Huang

Other Parts Discussed in Thread: LMR36006, LMR36015

Hi team，

my customer need a inverting DC/DC which requires 24V input , -15V output and 100mA load current, I can't find too many solutions in the TI.COM. Could you please give me some recommended part number with the cost as low as possible?

over 6 years ago

0 Marshall_Beck over 6 years ago

TI__Mastermind 35210 points

Thanks, we need an inverting buck boost solution.

LMR36006 or LMR36015 should be able to fulfill the requirement of greather than 36V

http://www.ti.com/lit/an/snva856/snva856.pdf

0 Marshall_Beck over 6 years ago in reply to Marshall_Beck

TI__Mastermind 35210 points

Keep in mind, this is a transformless solution, so it is already competitively priced.

0 Zhihong Huang over 6 years ago in reply to Marshall_Beck

TI__Intellectual 1550 points

Hi, Marshall

Thanks for your recommendation, but I find out that LMR36006 or LMR36015 is classified as buck instead of inverting buck, and the datasheet doesn't say that it can generate a negative output voltage. so what should I do for generating a negative output voltage via LMR36006 or LMR36015 ? designing a circuit like this via the Buck IC?

0 Marshall_Beck over 6 years ago in reply to Zhihong Huang

TI__Mastermind 35210 points

The IC says it is a buck, but trust me, it can be more than a buck :)

As the figure you highlighted in your post, the regular buck contains VIN, VOUT and GND connections, connected to the HS, Indcutor, and LS fet , respectfully.

By simply changing the connections as highilighted in RED of where system reference is a negative voltage will appear across GND and VOUT.

The application note I linked you has a design example with a TI catalog buck part configured in inverting buck boost mode near tthe end/

Please contact me directly after you marked this thread as resolved and I can help out further by presenting a design after I better understand your end application.

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Part number recommendation ：24V input -15V output 100mA load current