We are testing the buck boost controller MP28167GQ-Z with our design the following are our observation
- Input voltage 5.2 V and Current 3 Amps (source is Power supply) - we have got the result of 5V output and we are able load the output up to 2.5 Amps
- Input Voltage 3.8V current 20000 mA (source is Battery)- we have got the 5V output and unable to load the output beyond 1.13 Amps
- The Regulated power supply also used to give 3.8V DC with 3 Amps as input - But we observed the same result as not able to load beyond 1.13 Amps
we require the suggestion to get at least 2.5 Amps while the input is 3.3 V to 4 V DC
Welcome to the MPS Forums!
A few notes about your application of the MP2817 buck-boost converter:
- For the battery input source, do you mean 2A, or are you truly supplying 20A?
- What is your expected input range other than using 3.3V and 4Vin for the charge range of a battery? Do you anticipate any higher inputs?
- Assuming your input is just 3.3V - 4V, why do you need a Buck-Boost if Vout = 5V? Do you plan on having the battery charged? Let me know.
- Are you using your own testing layout or are you are using an EVB?
Taking a look at this graph from the MP28167 datasheet, looks like the load current is limited at lower input voltages and doesn’t reach 2.5A a little past 4Vin, which aligns with the behavior that you have described, so looks like your requirement of 2.5A where Vin = 3.3V - 4V is not possible with this IC.
Consider the following IC for your application and read through the datasheet for expected characteristics:
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