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High-Speed Step-Down Controllers with Synchronous Rectification for CPU Power

Industry's Smallest, Fastest Response Pentium® Pro/Pentium II

Product Details

Key Features

Simplified Block Diagram

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Key Features

  • Better than ±1% Output Accuracy Over Line and Load
  • 90% Efficiency
  • Excellent Transient Response
  • Resistor-Programmable Fixed Switching Frequency from 100kHz to 1MHz
  • Over 35A Output Current
  • Digitally Programmable Output from 1.1V to 3.5V in 100mV Increments (MAX1624)
  • Resistor-Adjustable Output down to 1.1V (MAX1625)
  • Remote Sensing
  • Adjustable AC Loop Gain (MAX1624)
  • GlitchCatcher™ Circuit for Fast Load-Transient Response (MAX1624)
  • Power-Good (PWROK) Output
  • Current-Mode Feedback
  • Digital Soft-Start
  • Strong 2A Gate Drivers
  • Current-Limited Output

Applications/Uses

  • Computers: Desktop, Workstation, Server
  • GTL Bus Termination
  • Industrial Computers
  • LAN Servers
  • Pentium®

Description

The MAX1624/MAX1625 are ultra-high-performance, step-down DC-DC controllers for CPU power in high-end computer systems. Designed for demanding applications in which output voltage precision and good transient response are critical for proper operation, they deliver over 35A from 1.1V to 3.5V with ±1% total accuracy from a +5V ±10% supply. Excellent dynamic response corrects output transients caused by the latest dynamically clocked CPUs. These controllers achieve over 90% efficiency by using synchronous rectification. Flying-capacitor bootstrap circuitry drives inexpensive, external N-channel MOSFETs.

The switching frequency is resistor programmable from 100kHz to 1MHz. High switching frequencies allow the use of a small surface-mount inductor and decrease output filter capacitor requirements, reducing board area and system cost.

The MAX1624 is available in a 24-pin SSOP and offers additional features such as a digitally programmable output in 100mV increments; adjustable transient response; selectable 0.5%, 1%, or 2% AC load regulation; and gate drive for a current-boost MOSFET. The MAX1625 is resistor adjustable and comes in a 16-pin narrow SO package. Other features in both controllers include internal digital soft-start, a power-good output, and a 3.5V ±1% reference output. For a similar controller compatible with the latest Intel® VRM/VID specification, see the MAX1638 data sheet.

Simplified Block Diagram

MAX1624, MAX1625: Typical Operating Circuit MAX1624, MAX1625: Typical Operating Circuit Zoom icon

Technical Docs

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 .

Sampling:
Selecting the Sample button above will redirect to the third-party ADI Sample Site. The part selected will carry over to your cart on this site once logged in. Please create a new account there if you have never used the site before. Contact SampleSupport@analog.com with any questions regarding this Sample Site.