Requirement of DC-DC converter with dual output voltage

Prakash Bharti

Prodigy 90 points

Other Parts Discussed in Thread: TPS7A39, TPS62933F

Hi TI team,

I am looking for a converter that with below parameters:-

1. Dual input voltage i.e -27V and +27V.(DC input)

2. Required dual output voltage of -3.3V and +3.3V.(DC output)

Please help in suggesting a circuit or converter for the same.

Thanks & Regards,

Prakash

7 months ago

0 Athos Zhao 7 months ago

TI__Expert 7320 points

Hi Prakash,

Is it possible you use a LDO? I see TPS7A39 is a good choice.

Or maybe you have heavier load then I can loop LDO team for promotion.

If you must use a buck converter, we don't have such negative input voltage devices. If you can accept our flybuck solution as below(just use +27Vin for ±3.3Vout), please show me the peak load current and I'll suggest a best one.

0 Prakash Bharti 7 months ago in reply to Athos Zhao

Prodigy 90 points

The peak load current will be 1A.

0 Miranda Gu 7 months ago in reply to Prakash Bharti

TI__Genius 15137 points

Hi Prakash,

1. If you want 27Vin, ±3.3Vout 1A, as Athos shows, please evaluate TPS62933F flybuck topology.

2. If you want -27Vin, -3.3Vout 1A, my product line (Mid-Vin Buck) doesn't have dedicated parts. I found a related e2e thread for your reference. https://e2e.ti.com/support/power-management-group/power-management/f/power-management-forum/1058496/negative-input-negative-output-with-buck-converter

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Requirement of DC-DC converter with dual output voltage