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72V Fixed-Ratio DC/DC Controller Eliminates Power Inductor & Delivers 500W in Non-Isolated Intermediate Bus Converter Applications

Jun 20 2017 - MILPITAS, CA and NORWOOD, MA
  • LTC7820 Package

    Analog Devices, Inc., which recently acquired Linear Technology Corporation, announces the LTC7820, a high power fixed ratio charge pump DC/DC controller that eliminates the power inductor in a non-isolated intermediate bus converter, allowing up to a 50% reduction in circuit size and up to 4000W/in3 power density. The LTC7820 drives external MOSFETs in voltage divider, doubler or inverter configurations with an efficiency of up to 99%. Its open loop fixed duty is ideal for non-isolated intermediate bus applications in power distribution, datacom, telecom, high-end computing and industrial systems.

    LTC7820

    72V Fixed Ratio High Power Charge Pump Controller


    The LTC7820 operates over a 6V to 72V (80V abs max) input voltage range and can produce output currents in multiple 10s of amps, depending on the topology and choice of external components. It can be configured for a 2:1 step-down ratio from an input voltage up to 72V. Two of the LTC7820 IC’s can be cascaded for a 4:1 step-down ratio. For even higher step-down ratios, such as a 6:1, the Dickson converter topology is recommended and is ideal for 54V input to a 9V outputs, requiring only a single LTC7820. The LTC7820 can also be configured for a 1:2 step-up ratio or a 1: 1 inverter ratio from an input voltage as high as 36V. External MOSFETs switch at a fixed frequency, programmable from 100kHz to 1MHz. The LTC7820’s powerful 1.1Ω N-channel MOSFET gate drivers maximize efficiency and can drive multiple MOSFETs in parallel for higher power applications.


    The LTC7820 monitors system voltage, current and temperature for faults, and uses a sense resistor for overcurrent protection. It stops switching and pulls the /FAULT pin low when a fault condition occurs. An on-board timer can be set for appropriate restart/retry times. The EXTVCC pin permits the LTC7820 to be powered from the lower voltage output of the converter or other available sources up to 40V, reducing power dissipation and improving efficiency. Additional features include soft switching for low EMI, a power good output signal, undervoltage lockout and internal charge balance circuitry.


    The LTC7820 is available in a 4mm × 5mm QFN-28 package. Extended and industrial temperature versions are available from –40 to 125°C. The 1,000-piece price starts at $4.70 each. For more information, visit www.linear.com/product/LTC7820.


    Summary of Features: LTC7820


    • Wide VIN Range: 6V to 72V, 80V abs max
    • Up to 4000W/in3 Power Density
    • Up to 99% Efficiency
    • Step-Down: 2:1 Ratio from VIN Up to 72V
    • Dickson Converter Topology for 6:1 Step-Down Ratio
    • Step-Up: 1:2 Ratio from VIN Up to 36V
    • Inverter: 1:1 Ratio from VIN Up to 36V
    • Delivers Up to 500W
    • Operating Frequency from 100kHz to 1MHz
    • Soft Switching Topology for Low EMI
    • Quad Powerful N-Channel MOSFET Gate Drivers
    • Input Current Sensing & Overcurrent Protection
    • Short-Circuit Protection with Programmable Timer & Retry
    • Power Good Output Signal
    • Available in a 4mm × 5mm 28-Pin QFN Package

    Pricing shown is for budgetary use only and may differ due to local duties, taxes, fees and exchange rates.


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  • About Analog Devices
  • Analog Devices (NASDAQ: ADI) is the leading global high-performance analog technology company dedicated to solving the toughest engineering challenges. We enable our customers to interpret the world around us by intelligently bridging the physical and digital with unmatched technologies that sense, measure, power, connect and interpret. Visit http://www.analog.com
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