125 KHz RFID

Im currently working on a project that needs a 125 kHz RFID reader. Im using a RMD6300, but since it operates at 5V and my battery is a 3.7 Lipo, I have to use a step up converter to run it. It is causing some power management issues. Does anyone know of a good 125 kHz RFID reader that operates at 3.3v?

Thanks for your help!