DC-DC Step updown 2.5V-15V to 3.3V

DSC_6980

Official specifications: I got it from Ebay dealer: memolines

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Measurements

This chapter only contains a few of the measurement, click here to see all

Load%20sweep%203.1V

The lowest input voltage the converter will work at is 3.1V, at 3V it do not work. This may be related to the enable pin.

Load%20sweep%204V

Increasing the input voltage to 4V changes the efficiency a bit at higher currents.

Load%20sweep%2012V

At 12V input the efficiency is higher at high current and lower at low current.

Voltage%20sweep%200.1A%20input%20current

Voltage%20sweep%200.1A

It works nicely with input voltage from 3.1V up to 14.5V with a 100mA load.

Voltage%20sweep%200.6A

At higher current the efficiency is fairly low with low input voltage.

No%20load%20voltage%20sweep

Power consumption varies with input voltage, it looks like the boost converter may kick in at slightly above 5V.

20ohmVin3.3V

With a fairly low load the output noise is low.

10ohmVin3.3V

But increase the load and the noise will increase, this could probably be fixed with som capacitors.

10ohmVin12V

Increasing the input voltage will reduce the noise.

PowerOn20ohm
PowerOff20ohm

Turning power on off works fine with load, at higher load there may be some oscillations during turn-on/off.

LoadOn20ohmVin3.3V

Turning on a load is handled with a minimal voltage drop.

LoadOn10OhmVin3.3VC

But at higher load there may be oscillations and some input and output capacitors is needed.

LoadOff20ohmVin9V

The voltage will increase when a load is removed.

Load%20test%200.5A

I did the load test at 0.5A with 3.5V input, this was handled nicely.

Temp6784

M1: 61.4C, M2: 66.6C, M3: 66.1C, M4: 59.9C, HS1: 76.0C
The converter is warm, but not too warm, this means it can handle about 1W power loss.

Load%20test%200.6A

Increasing the input voltage to 9V and increasing the current to 0.6A do not present any problems.

Temp6786

M1: 58.4C, M2: 53.9C, M3: 50.8C, HS1: 61.3C
Now the converter is in buck mode and the other inductor heats up, generally everything is a bit cooler here.



Closer look

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The module only uses a 6 pin chip. The output inductor is capacitive coupled to the input inductor and the chip only controls the input inductor.


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DSC_6982 DSC_6983

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Good markings on the back.

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Conclusion

The module is not very powerful, but can be used to supply a 3.3V circuit from a LiIon battery, especially if it is fairly low power. I would use some extra capacitors with the module.


Notes