Synchronous buck regulator

Low resistance internal switches have been incorporated to allow the LTC3616 to deliver up to 6A of continuous output current from a 3 x 5mm QFN package. According to Linear its low dropout operation allows the output voltage to range from 0.6V to millivolts below VIN. The LTC3616 operates from an input voltage of 2.25 to 5.5V, making it suitable for single cell Li-Ion applications as well as 3.3V or 5V intermediate bus systems. Its switching frequency is user programmable from 300kHz to 4MHz, enabling the use of tiny, low cost capacitors and inductors. The LTC3616 uses internal switches with RDS(ON) of only 25m and 35mOhms to deliver efficiencies of up to 95%. Burst Mode operation reduces no load quiescent current to 75µA, maximising both light-load efficiency and run-time in battery-powered applications. An adjustable Burst Mode clamp enables designers to optimise light load efficiency. For applications requiring the lowest possible noise, the LTC3616 can be configured to run in either pulse-skipping or forced continuous modes, reducing noise and potential RF interference. Additionally, programmable switching slew rates can further reduce potential noise concerns. The LTC3616 also offers inputs for tracking capability as well as a DDR memory mode in which the device can source/sink ±3A. Additional features include optional active voltage positioning, a Power Good voltage monitor, external synchronization capability and thermal protection. An industrial grade version, the LTC3616IUDD, is guaranteed to meet specifications over the -40 to 125°C operating junction temperature range.