The Synchronous Step-down DC/DC Controller Released by Linear Technology

Published:2012/2/8 0:56:00 Author:Li xiao na From:SeekIC

One of the tech industry’s most profitable companies-Linear Technology Corporation, was established in the year o f1981. It is specialized in designing, manufacturing and marketing a broad line of standard high performance IC. The products of this firm have wide application.

The output synchronous step-down DC/DC controller has been released by Linear Technology recently, which can provide multiphase operation, differential output voltage sensing and high frequency operation. Working with external power train devices such as power blocks and DrMOS, as well as discrete N-channel mosfets, up to 12 phases can be paralleled and clocked out-of-phase to minimise input and output filtering for very high current requirements.

With the voltage mode control architecture of the device, the selectable fixed operating from 250kHz to 2.25MHz becomes possible; furthermore, it can be synchronized over the same range with its phased –lock-loop. The current sharing loop of LTC3861 is made for accurate current sharing between phase across multiple ICs, both DC and during a load transient.

The true remote output voltage sensing of both VOUT and ground terminals can be provided by the differential amplifier; hence the high accuracy regulation is available. The device operates with a VCC voltage ranging from 3V to 5.5V, a VIN voltage (drain voltage for the high-side mosfet) from 3V to 24V and it produces output voltages from 0.6V to 5V. The suitable package of LTC3861 is a 36-lead 5mm x 6mm QFN package.

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