100V, Bidirectional Multiphase Synchronous Buck or Boost Controller

November 21, 2017 // By Ding Li - Senior Power Applications Engineer, Power Products
The LTC3871 is a bidirectional synchronous buck or boost controller to step-down or step-up the voltage between the 12V and 48V batteries in dual battery automotive applications.

The LTC3871 is a 100V/30V bidirectional two-phase synchronous buck or boost controller. It operates in buck mode or in boost mode. Either mode is configured on demand with an applied control signal. Up to 12 phases can be paralleled and clocked out-of-phase for high current applications up to 3kW. Four control loops, two for current and two for voltage, enable control of voltage and current on either the 48V or 12V outputs.
The device’s on-demand feature dynamically regulates the current in either direction. The LTC3871 operates at a selectable fixed frequency between 60 kHz and 475 kHz, and can be synchronized to an external clock over the same range. Additional features include overload and short-circuit protection, independent loop compensation for buck and boost, ±1% voltage regulation accuracy over temperature, as well as undervoltage and overvoltage lockout.

For further details see the video .


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