need help finding a dc dc converter

hello Robert
is the VOUT from 3.6V to 7V or 3.6V to 3.7V? if the former one, may i know why and if it is continuous?

thanks
Jasper Li

hi Jasper, thank you for your message

the vout is from 3.6v to 7.1v.   because the product will allow the costumer to modify the voltage themselves by push a button, and we prefer the voltage could be changed from 3.6v to 7.1v by 0.5v increment or so

hi Jasper, thank you for your message

the vout is from 3.6v to 7.1v. because the product will allow the costumer to modify the voltage themselves by push a button, and we prefer the voltage could be changed from 3.6v to 7.1v by 0.5v increment or so

sorry, but no boost converter in my team can meet the requirement. we have devices to cover 3.6V to 5V or 4.5V to 7.1V. but not device cover this wide range. and I2C interface is not common feature. hope application engineer from other can have good solution.

may i know what 3.6V and 7.1V output is used for?

thanks
Jasper Li

Hi Jasper,

we are currently using our device to burn an electrical cigarette's atomizer (2.4ohm~ 2.6ohm), and the current can be as much as 1.5A.

we need a boost converter to provide a 3.6V to 7V voltage from a 3.6V battery and allow the user to modify the power by just pressing a button in around 0.5V increment.

Today an engineer told me i can choose a PWM converter to make it true. so dear Jasper, our project is like this, do you have any solution or links could help us on this 

Thank you

Robert
is the max. output current always 1.5A from 3.6V to 7V, the output power double when VOUT up to 7V? if the atomizer is 2.5ohm, the output current is much higher than 1.5A in 7V output.

if there is a MCU in the customer board, a PWM signal+ RC filter circuit can generate a voltage (something like DAC) to modify the output voltage of the boost converter by changing the duty cycle of the PWM signal. if customer can accepted this solution, there could be a solution for this application

thanks
Jasper Li

thanks Jasper,

it was my mistake, seems the atomizer resistance will rise up a little bit as the voltage rising up.  usually 2.5ohm ~ 3ohm. and the output current could be more than 1.5A, probably around 2.5A

a PWM signal + RC filter seems to be a good solution, would you mind provide some diagram/schematic of it? or could you provide any TI's chip which has such functions?

Thank you again

Robert

following could be a solution. you can  apply an EVM to verified. i can do some tests to make sure the TPS61088 can support 3.6V in and 3.6V output application  if the solution is OK for your.

why the input voltage is fixed 3.6V? as i know, the input power of this kind of product should be a battery.

may i know the part number of the atomizer you are going to used. or there is a datasheet of the atomizer you could share. thanks

Jasper Li