Dual output, multiphase step-down DC/DC controller operates with power blocks and DrMOS devices
Up to 12 phases can be paralleled and clocked out-of-phase to minimize input and output filtering for high current requirements (up to 300 A). Applications include high current power distribution and industrial systems, DSP and ASIC supplies.
The LTC3861’s current sharing loop enables accurate current sharing between phases across multiple ICs, both DC and during a load transient. The device’s voltage mode control architecture allows for selectable fixed operating frequency from 250 kHz to 2.25 MHz or it can be synchronized over the same range with its phased-lock loop (PLL). The differential amplifier provides true remote output voltage sensing of both V OUT and ground terminals, enabling high accuracy regulation.
The LTC3861 operates with a V CC voltage ranging from 3 V to 5.5 V, a V IN voltage (drain voltage for the high-side MOSFET) from 3 V to 24 V and it produces output voltages from 0.6 V to 5 V. The output current is sensed by monitoring the voltage drop across the output inductor (DCR) for maximum efficiency or using a sense resistor. Its adjustable current limit can be configured for very low sense voltages (up to 50 mV) to minimize power loss.
Additional features include adjustable soft start or tracking, output overvoltage protection and two power good output signals. Furthermore, it maintains ±1% reference voltage accuracy over an operating temperature range of -40 to 125°C.
More information about the LTC3861 dual output synchronous step-down DC/DC controller at www.linear.com/product/LTC3861
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