I have a camera for which I bought a dummy battery to connect it with power bank or other power source. Original battery is 3.6 V Li-ion so I need around 4.3 V but the USB (from powerbanks) is 5.1 V usually.
What I can do to step down to 4.3 V without loosing much energy in the middle to not discharge battery quickly? I found the buck module MP1584 but in the datasheet there is Vin-Vout > 1.8 V so it won't fit right? Is there anything else I can do, or can I use a 5 V without destroying my camera?