Hi,

I have designed a cheap boost circuit using the ap3031ktr but after a while I have changed the load which requires a higher boost voltage than the current IC can provide.

I use a 5V input and currently boost the output to a solid 36V. My new load will require a voltage of 45V. Current consumption of the load is ~800mA.

The hard part of finding an alternative is mainly the price since this IC only costs 7cents per 1000 pieces. I have tried the big websites such as mouser,farnell and arrow but most of them around 17cents per 1000 pieces.

Does anyone have a good reccomendation and or advice?

I would appreciate this a lot!

 

Why are you using an input voltage of 5V?
At 800mA load that translates to something like 8A input current. At that sort of current youll need a controller IC and separate mosfet and diodes external to the IC. The diode and mosfet will far exceed the price of the IC

 

Surely thereis a higher DC voltage someplace? Kaindub makes a very good point. A six X boost ratio is asking for problems. A six to one step DOWN would be OK, but not for a step up.

 

Hi,

I have designed a cheap boost circuit using the ap3031ktr but after a while I have changed the load which requires a higher boost voltage than the current IC can provide.

I use a 5V input and currently boost the output to a solid 36V. My new load will require a voltage of 45V. Current consumption of the load is ~800mA.

The hard part of finding an alternative is mainly the price since this IC only costs 7cents per 1000 pieces. I have tried the big websites such as mouser,farnell and arrow but most of them around 17cents per 1000 pieces.

Does anyone have a good reccomendation and or advice?

I would appreciate this a lot!

Try using Texas Instruments' WEBENCH: https://webench.ti.com/power-designer/switching-regulator to design as step-up converter. Other manufacturers have similar design tools too.
-Rick