Power Electronics

Synchronous Buck Achieves High Efficiency

Linear Technology’s LTC3568 is a high-efficiency, 4-MHz, synchronous buck regulator that delivers up to 1.8 A of continuous output current with up to 96% efficiency. Using a constant frequency and current-mode architecture, the LTC3568 operates from an input voltage range of 2.5 V to 5.5 V. It can generate output voltages as low as 0.8 V, enabling it to power low-voltage DSPs and microcontrollers. Its switching frequency is programmable from 850 kHz to 4 MHz.

The LTC3568 uses internal switches with an RDS(ON) of 0.11 Ω to deliver high efficiency. It also uses low dropout 100%-duty-cycle operation to allow output voltages equal to VIN. The LTC3568EDD is available now in a 3-mm x 3-mm DFN-6 package. Pricing starts at $2.95 each for both parts in 1000-piece quantities.

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