I am powering a latching solenoid valve that requires a 100ms pulse at 6V and 7W via a 1500uF capacitor with a transistor and a 555 timer controlling the pulse. Currently, the capacitor gets charged directly from a 9V battery through a 120Ohm resistor. At the moment the battery gets drained faster than expected and stops working when the voltage in the battery drops from use.
My proposition is that I put a DC-DC converter between the battery and the 120ohm resistor so that we can use the battery at its lower voltages by trickle charging the capacitor.
I found this IC(LM2574N-12GOS-ND) but maybe there is a better way to do this operation.