This is a designed buck converter for cellphone charger using LM 555 as Pulse Width Modulator.The supply voltage will be ranging from 9V to 16V DC directly from a car battery. the feature of this circuit is the unique feedback loop of the circuit and the transfer of 5V supply for the lm555 from that battery side to load side. This circuit is also capable of variable load from no load to 1 amp full load with almost constant voltage. Hope you like it.
