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Phase Extender, Slave Step-Down Controller for up to 240A Compatible with Digital Power System Management

Mar 13 2014 - MILPITAS, CA
  • Linear Technology Corporation introduces the LTC3870, a dual phase synchronous step-down slave controller that can generate currents up to 240A when paired with a companion master controller by extending the phase count in multiphase applications. Compatible master controllers include the LTC3880 and LTC3883 digital power system management controllers.


    The LTC3870 is an alternative to Linear Technology’s full-featured controllers and provides the essential functions for multiphase slave designs. It operates over an input voltage range of 4.5V to 60V and produces a fixed output voltage up to 14V. Up to 12 phases can be paralleled and clocked out-of-phase to minimize filtering. Its peak current-mode architecture allows for accurate phase-to-phase current sharing even for dynamic loads. Applications include power distribution, redundant (n+1) supplies, industrial systems, DSP and ASIC power.


    The LTC3870 has a fixed operating frequency from 250kHz to 1MHz, or it can be synchronized to an external clock. The powerful 1.1 Ohm on-board all N-channel gate drivers minimize MOSFET switching losses. Precise programmable current sense threshold limits from 50mV to 72mV minimize power loss and accurately set the overcurrent trip point. Additional features include selectable continuous or discontinuous light load operation, programmable phase shift control and overvoltage protection.


    The LTC3870 is available in a 28-lead 4mm × 5mm QFN package. The 1,000-piece price starts at $2.35 each. For more information, visit www.linear.com/product/LTC3870.


    Summary of Features: LTC3870


    • Phase Extender for High Phase Count Voltage Rails
    • Ideal for Use with Digital Power System Management Master Controllers LTC3880 & LTC3883
    • Accurate Phase-to-Phase Current Sharing
    • Peak Current-Mode Control
    • Wide VIN Range: 4.5V to 60V
    • VOUT Range: Up to 14V
    • Up to 12-Phase Operation
    • High Output Current Capable - Up to 240A
    • Programmable Phase Shift Control
    • Adjustable Current Sense Threshold from 50mV to 72mV
    • Phase-Lockable Fixed Operating Frequency from 250kHz to 1MHz
    • Powerful On-board 1.1 Ohm Gate Drivers
    • Overvoltage & Overcurrent Protection

    Phase Extender Slave Step-Down Controller

    LTC3870 PR Photo

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  • About Analog Devices
  • Innovation, performance, and excellence are the cultural pillars on which Analog Devices has built one of the longest standing, highest growth companies within the technology sector. Acknowledged industry-wide as the world leader in data conversion and signal conditioning technology, Analog Devices serves over 60,000 customers, representing virtually all types of electronic equipment. Analog Devices is headquartered in Norwood, Massachusetts, with design and manufacturing facilities throughout the world. Analog Devices is included in the S&P 500 Index.
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