Analog Devices Expands Versatile DC-DC Switching Controller Family Featuring Current-mode and Voltage-mode Configuration Options for High-current Applications

Sep 18 2012 -Norwood, MA
  • Analog Devices, Inc. (ADI), a global leader in high-performance semiconductors for signal-processing applications, today introduced the ADP1851 wide-input-range, synchronous, step-down DC-to-DC controller with voltage tracking and synchronization capability. The ADP1851 expands ADI’s popular series of configurable controllers following the recently introduced ADP1853. The versatile ADP1851/53 can be configured to work as a voltage-mode controller with input feed-forward or as a current-mode controller, depending on the application and customer preference. The ADP1851/53 are designed for high efficiency, high current, fast, transient point-of-load applications in a broad range of communications networking, industrial, medical, and consumer applications.

    The ADP1851/53 can be connected in parallel to achieve higher current delivery—up to 50 A depending on the external FETs. The ADP1851 features a synchronization input eliminating troublesome “beat” frequencies and reducing system input capacitance when multiple devices with phase-shifted synchronization are used. ADP1851 also has a tracking capability that enables controlled start-up. Simple, robust sequencing can be implemented using the precision enable and power good functions. The ADP1851 is available in a 16-lead LFCSP (4-mm x 4-mm) package while the ADP1853 with clock out is available in a 24-lead (4-mm x4-mm) LFCSP package.

    More About the ADP1851/53 Versatile DC-to-DC Switching Controller Family

    In current-mode control, the ADP1851/53 architecture detects the current during the off period to improve noise immunity using the on-resistance of the low-side FET—or a series sense resistor for higher accuracy. Externally adjustable slope compensation is added to optimize performance in current mode. With minor adjustments to external resistor settings, the ADP1851/53 can be configured for voltage-mode control for improved noise performance, using input line feed-forward for excellent line rejection. The ADP1851/53 series has a selectable pulse-skip mode to increase efficiency during light load operation. The device also has an accurate current limit, which allows for the sizing selection of external components to optimize valuable PCB space. The ADP1851 and ADP1853 are supported by ADI’s online ADIsimPowerTM tools, making the device easy to use and reducing design time.

    ADP1851/ADP1853 Key Features and Benefits:

    • Configurable as voltage-mode or current-mode controller depending on the application and customer preferences
    • Wide range input from 2.75 V to 20 V allows operation from commonly used voltage rails: 3.3 V, 5 V and 12 V
    • Power good and precision enable simple, robust sequencing and health detection
    • Programmable, accurate current limit optimizes output inductor and solution size.
    • Synchronization function eliminates potential “beat” frequencies and can be used to reduce input current ripple using phase-shift synchronization
      • ADP1853 adds clock out master feature
    • Reference accuracy ±1% over the temperature range from –40°C to +125°C and ±0.5% from –40°C to +85°C.
    • Selectable pulse-skip mode for energy saving at light load
    • Easy to Use ADIsimPowerTM tool reduces design time

    Availability and Pricing Components

    Product Full Production Temperature Range Price Each Per 1,000 Packaging
    ADP1851ACPZ-R7 Now -40°C to +125°C $1.05 16-lead LFCSP
    ADP1851-EVALZ Now -- $60.00 --

    • Order samples and download data sheet: ADP1851
    • Connect with engineers and ADI product experts on EngineerZone™, an online technical support community
    • Learn more about ADI’s power management applications, design tools and case studies
  • 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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