I've tested EasySMX's budget Hall effect controller and it beats the Xbox pad it tries to mimic

You can get Hall effect controllers slightly cheaper, but you'd struggle to find as feature-rich a package without some heavy ...
IEEE

A Charge-Recycling Buck-Store and Boost-Restore (BSBR) Technique With Dual Outputs for RGB LED Backlight and Flashlight Module

Abstract: A boost converter with buck-store and boost-restore (BSBR) technique fabricated by 0.25 mum CMOS BCD process can provide different supply voltages to drive series red, green, and blue LEDs ...