Hello there,
I have hardware design in which I have used Buck-boost converter. Input voltage(from battery) is 6v and my MCU is running on 5v so I have using buck mode of the ic, but as soon as the voltage drops below 4.5v boost mode is used. Also current consumption required for me is around 850uA.
Currently I am using TPS63061DSC, but the problem is market unavailability. Long lead times are reported for this product. It'll be helpful if you can suggest any alternative for the same

 

When the Voltages are so close together, use a Low-Drop-Out LDO-Linear-Regulator.
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When the Voltages are so close together, use a Low-Drop-Out LDO-Linear-Regulator.
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How is the LDO supposed to raise 4.5 V back up to 5 V? That'll be a good trick if you can pull it off.

 

as the voltage drops below 4.5v boost mode is used

How much below 4.5V are you planning on discharging the battery?
Many batteries don't like a deep discharge.

 

Currently I am using TPS63061DSC, but the problem is market unavailability.

Go a digikey.com or any supplier and see how many they have. Then get a years supply. Parts are hard to find.

 

TPS63060 Arrow has 4 in stock. lol Probably gone by the time you read this.

 

Sometimes it is impossible to find a replacements so the design change is necessity, easiest is to run your MCU with 3V3 volts and use buck only, but this only if that change is possible.

 

How much below 4.5V are you planning on discharging the battery?
Many batteries don't like a deep discharge.

max is 4v, after that i intend to change the battery. because the it wont provide me with enough current to power the other aspects of the circuit.

 

TPS63060 Arrow has 4 in stock. lol Probably gone by the time you read this.

I'll be requiring much more than that.....

 

Go a digikey.com or any supplier and see how many they have. Then get a years supply. Parts are hard to find.

I have tried that, but they dont have enough stock for years supply

 

Sometimes it is impossible to find a replacements so the design change is necessity, easiest is to run your MCU with 3V3 volts and use buck only, but this only if that change is possible.

I cant change the mcu, so if you have another replacement for ic please suggest.

 

Hello there,
I have hardware design in which I have used Buck-boost converter. Input voltage(from battery) is 6v and my MCU is running on 5v so I have using buck mode of the ic, but as soon as the voltage drops below 4.5v boost mode is used. Also current consumption required for me is around 850uA.
Currently I am using TPS63061DSC, but the problem is market unavailability. Long lead times are reported for this product. It'll be helpful if you can suggest any alternative for the same

If you have the design chops to do it you can build what you need from basic parts. It will take more time and board area, but it can be done. Additionally, I would not attempt this unless you have previously done a discrete design of an SMPS.

 

What about one of these?

 

What about one of these?

I hope one of them will work for you. It often comes down to choices like this where the design you have, cannot be realized, and a design you can realize may not be viable for other reasons. Finding a solution to this conundrum is both the joy and the frustration of this enterprise.

 

I hope one of them will work for you. It often comes down to choices like this where the design you have, cannot be realized, and a design you can realize may not be viable for other reasons. Finding a solution to this conundrum is both the joy and the frustration of this enterprise.

Thanks for the suggestion.
Let me check them out and discuss with team and then decide.

 

We have decided to use Buck instead of buck-boost. So now searching for the same...