3.7 Li ion battery to 3.3V and 5V IC

Hello everybody,
I am working on my home made project and it requires a stable 3.3V and 5V voltages to run my project, I am connecting a Li ion 3.7V battery to my project for the power supply.

Please help me in finding any module or any IC which gives output 3.3V and 5V by taking input from the battery voltage.

current requirement is around 250mA

please see the attachment along with this question,
Thank you

battery to 3.3 and 5v.png

You have 2 voltage rails, but you only give one current figure. You're missing some specs.

This link may be a good place to start: MC34063A design tool