MAX1917

PRODUCTION

Tracking, Sinking and Sourcing, Synchronous Buck Controller for DDR Memory and Termination Supplies

Reduce Capacitors and Cost of DDR Supplies

Data Sheet (Rev. 1) Product Selection Table
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Overview

  • 25A Sourcing and Sinking Current
  • Automatically Sets VTT to 1/2VDDR
  • VTT and VTTR Within 1% of 1/2VDDR
  • Smallest Output Capacitors
  • 4.5V to 14V (or 28V with Resistor-Divider) Input Voltage Range
  • 1.5V to 3.6V Input DDR Range
  • 200kHz/300kHz/400kHz/550kHz Preset Switching Frequencies
  • Variable Switching Frequency of Up to 1MHz
  • Overcurrent Protection Without Current-Sense Resistor
  • Internal Soft-Start
  • VTTR Reference Sources and Sinks Up to 25mA
  • Quick-PWM Control for Fastest Loop Response
  • Up to 96% Efficiency
  • 16-Pin QSOP Package

    • The MAX1917 provides a complete power-management solution for DDR memory. It contains a synchronous buck controller and an amplifier to generate 1/2VDDR voltage for VTT and VTTR. The VTT and VTTR voltages are maintained within 1% of 1/2VDDR. The controller operates in synchronous rectification mode to ensure balanced current sourcing and sinking capability of up to 25A. With a shutdown current of less than 5µA, the MAX1917 is the best choice for low-power notebook applications, as well as servers and desktop computers. An all N-FET design optimizes efficiency. The MAX1917 can also be used for generating VDDR and as a general-purpose step-down controller with variable switching frequency as high as 1MHz with few additional components.

    The MAX1917 uses Maxim's proprietary Quick-PWM™ architecture for fast transient response up to 96% efficiency, and the smallest external components. Output current monitoring is achieved without sense resistors by monitoring the bottom FET's drain-to-source voltage. The current-limit threshold is programmable through an external resistor. The MAX1917 comes in a space-saving 16-pin QSOP package.

    Applications

    • AGTL Bus Termination Supplies
    • Cell Phone Base Stations
    • DDR Memory Power Supplies
    • Desktop Computers
    • Networking Systems
    • Notebook Computers
    • Processor or DSP Core Supply
    • Storage
    MAX1917
    Tracking, Sinking and Sourcing, Synchronous Buck Controller for DDR Memory and Termination Supplies
    MAX1917: Typical Operating Circuit
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    Documentation

    Data Sheet 1

    Reliability Data 1

    Design Note 1

    Technical Articles 3

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    Software Resources

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    Hardware Ecosystem

    Parts Product Life Cycle Description
    Switching Regulators & Controllers 3
    MAX1809
    		PRODUCTION 3A, 1MHz, DDR Memory Termination Supply
    MAX1714
    		PRODUCTION High-Speed Step-Down Controller for Notebook Computers
    MAX1718
    		PRODUCTION Notebook CPU Step-Down Controller for Intel Mobile Voltage Positioning (IMVP-II)
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    Evaluation Kits

    MAX1917EVKIT

    Evaluation Kit for the MAX1917

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    Features and Benefits

    • Automatically Sets VTT and VTTR to 1/2VDDR
    • ±1% Output Voltage Accuracy
    • 2.5V to 14V Input Voltage Range
    • 7A Output Current Capability
    • Sourcing and Sinking Current
    • 550kHz Switching Frequency
    • 16-Pin QSOP Package
    • Low-Profile Components
    • Fully Assembled and Tested

    Product Details

    The MAX1917 evaluation kit (EV kit) demonstrates the MAX1917's standard 7A application circuit. This DC-DC converter provides a complete power-management solution for DDR memory. This EV kit is a fully assembled and tested circuit board. The MAX1917 EV kit generates a regulated voltage for VTT and VTTR that is half the voltage at the DDR input. The input voltage range is 2.5V to 14V. The circuit is configured to deliver 7A of output current. The DC-DC converter uses buck topology with synchronous rectification to achieve low output voltage with greater than 90% efficiency. The converter output is capable of sourcing and sinking current. Sink capabilities at low voltage arise from the use of a synchronous rectifier, which allows the inductor current to reverse. The EV kit operates at 550kHz switching frequency and has superior load-transient response that meets JEDEC specifications for DDR memory.

    Applications

    • AGTL Bus Termination Supplies
    • Cell Phone Base Stations
    • DDR Memory Power Supplies
    • Desktop Computers
    • Networking Systems
    • Notebook Computers
    • Processor or DSP Core Supply
    • Storage
    MAX1917EVKIT
    Evaluation Kit for the MAX1917

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