5/21/2003 4MHz Synchronous Step-Down Regulator The LTC3414, a high efficiency, 4MHz synchronous buck regulator uses a constant frequency current mode architecture. It can deliver up to 4A of continuous output current at voltages as low as 0.8V from a thermally enhanced TSSOP-20 package.
It operates from an input voltage of 2.25V to 5.5V, making it ideal for single cell Li-Ion or NiMH batteries, as well as more general purpose fixed rail systems. The LTC3414's switching maximum frequency of 4 MHz allows the utilization of tiny low cost capacitors and inductors with less than 1.5mm profile. High frequency operation eliminates switching noise from critical wireless, and xDSL frequency ranges, making it ideal for xDSL modems, cellular base stations and automotive applications. The LTC3414 integrates internal MOSFET switches with an RDS (ON) of only 0.067 Ohms to deliver efficiencies as high as 95%. It also utilizes low dropout 100% duty cycle operation to allow output voltages equal to VIN. No load quiescent current is only 64uA, and less than1uA in shutdown, making it ideal for applications such as automotive power systems that require ultra-low supply currents.