Chapter 39

2-phase synchronous buck controller features light load Stage Shedding mode, active voltage positioning, low RSENSE and remote VOUT sensing

Charlie Zhao and Jian Li


The LTC3856, a single-output 2-phase synchronous buck controller, is described.


Synchronous buck controller



Today’s computer, datacom, and telecom systems demand power supplies that are efficient, respond quickly to load transients and accurately regulate the voltage at the load. For example, load current can be measured by using the inductor DCR, thus eliminating the need for a dedicated sense resistor. Inductor DCR sensing increases efficiency—especially at heavy load—while reducing component cost and required board space. ...

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