Burst is required for when A GSM Module connected with uC will send message, Currently i am using 7805 and it is working good, But at this time circuit is on my computer desk, No noise, no heat problem,
But on its actual location (Inside the car bonnet near the Engine) heat and noise can be a major issue.
I am also considoring LM350..
I repeat: i need stable, ripple free, heat tolerant power supply for sensitive components (eg Micro-controller, GSM Module)..