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12V/5V Input Buck PWM Controller

1MHz, 12V/5V Input Buck PWM Controller with Lossless Valley Current Sensing

Product Details

Key Features

Simplified Block Diagram

Technical Docs

Data Sheet 12V/5V Input Buck PWM Controller May 25, 2006

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Key Features

  • 8V to 16V or 5V ±10% Input-Voltage Range
  • Lossless Valley-Mode Current Sensing
  • Output Voltage Adjustable from 0.8V to 5.5V
  • Voltage-Mode Control
  • External Compensation for Maximum Flexibility
  • Digital Soft-Start
  • Sequencing or Ratiometric Tracking
  • Startup Synchronization
  • Programmable PGOOD Output
  • Programmable Switching Frequency from 100kHz to 1MHz
  • External Frequency Synchronization
  • SYNCIN and SYNCOUT Enable 180° Out-of-Phase Operation
  • Thermal Shutdown and Short-Circuit Protection
  • Space-Saving 5mm x 5mm, 32-Pin TQFN Package
  • Applications/Uses

    • Base Stations
    • Blade Servers
    • General 12V or 5V Input PWM Controllers
    • PCIe® ExpressModule™
    • RAID
    • Work Stations

    Description

    The MAX5951 is a 12V pulse-width modulated (PWM), step-down, DC-DC controller. The device operates over the input voltage range of 8V to 16V or 5V ±10%, and provides an adjustable output from 0.8V to 5.5V. The device delivers up to 10A of load current with excellent load-and-line regulation.

    The MAX5951 PWM section utilizes a voltage-mode control scheme for good noise immunity and offers external compensation, allowing for maximum flexibility with a wide selection of inductor values and capacitor types. The device operates at a fixed switching frequency that is programmable from 100kHz to 1MHz and can be synchronized to an external clock signal though the SYNCIN input. The device includes undervoltage lockout (UVLO) and digital soft-start. Protection features include lossless valley-mode current limit, hiccup-mode output short-circuit protection, and thermal shutdown.

    The MAX5951 is available in a space-saving 32-pin, 5mm x 5mm thin QFN package and is specified for operation over the -40°C to +85°C extended temperature range. Refer to the MAX5950 data sheet for a pin-compatible PWM controller with hot swap.

    Simplified Block Diagram

    MAX5951: Typical Operating Circuit MAX5951: Typical Operating Circuit Zoom icon

    Technical Docs

    Data Sheet 12V/5V Input Buck PWM Controller May 25, 2006

    Support & Training

    Search our knowledge base for answers to your technical questions.

    Filtered Search

    Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal .