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

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Reduce Capacitors and Cost of DDR Supplies

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Info: : PRODUCTION tooltip
Part Details
Part Models 2
1ku List Price Starting From $5.51
  • 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
  • Additional Details
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    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.


    • AGTL Bus Termination Supplies
    • Cell Phone Base Stations
    • DDR Memory Power Supplies
    • Desktop Computers
    • Networking Systems
    • Notebook Computers
    • Processor or DSP Core Supply
    • Storage
    Part Models 2
    1ku List Price Starting From $5.51

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