The ADP2102 high-speed synchronous switching converter can regulate the core voltage to as low as 0.8V when powered with a battery voltage between 2.7V and 5.5V.  Its constant on-time, current-mode control and 3-MHz switching frequency provide excellent transient response, very high efficiency, and superior line and load regulation. The high switching frequency allows the use of ultra-small, multilayer inductors and ceramic capacitors. Also, the ADP2102, available in a space-saving 3-mm × 3-mm LFCSP package, requires only three or four external components. Functionally complete, it includes safety features such as under-voltage lockout, short-circuit protection, and thermal shutdown.