I hope this message finds you well. We are currently seeking a DC-DC boost converter for a project that requires the following specifications:
Requirements:
Input Voltage: ~0.4 V
Input Current : ~1.2 A
Input Power: 600~800 mW
The converter will be used in a compact, low-power system requiring stable voltage output and minimal energy loss.
Could you kindly recommend suitable products that meet these requirements?
Hello welcome to the MPS Forum!
Thanks for reaching out. I see you are looking for a part suggestion for a boost converter with 0.4V Vin, 1.2A I_in.
What is the output voltage range and load current you are targeting? Are your input voltage and input current set at 0.4V and 1.2A? What is the end application?
From your given input parameters, it seems the input voltage is very low. Typically, DC-DC converters must have a high enough voltage during start-up to provide power to internal circuitry. Typical MPS Boost solutions have a minimum input voltage of 0.6V for our low voltage boost, with some parts capable of operating lower after a set input voltage.
Here are a few product reccomendations:
MP28600
The MP28600 can start from a low 0.7V input voltage (VIN), then work down to a 0.1V VIN after start-up. This part has a current limit of 1A continuous and 1.2A peak.
MP3414E
0.8V Vin. 1.8A, 1MHz, High-Efficiency, Synchronous Step-Up Converter with Output Disconnect.
Thank you for the recommendations! Our application requires a 5 V output with as high a current as possible to power a VR headset.
Given the input conditions of 0.4 V at 1.2 A, achieving startup operation with such a low voltage is critical for our design. The VR headset’s power requirement is significant, starting from 1.5W so we aim to maximize the current output to meet this demand.
please suggest accordingly
Google energy harvester IC and you should find solutions for 400mV inputs. I don’t think any of them will run up to 1.5W. Can you create a source of 0.8V and 600mA? then your options improve
As I mentioned earlier, the lowest high current boost MPS offers is the MP28600. Doing another search the MP3431/2 would be another alternative with a 0.8V operating voltage.
I would recommend jshannon’s suggestion to use a 2-stage solution. First boost up to 0.8V then we can have a few more options for you. Doing so will allow you to use the MP28600 or MP3414E.