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MAX1638
High-Speed Step-Down Controller with Synchronous Rectification for CPU Power

Industry's Smallest, Fastest-Response Pentium® Pro / Pentium II Supply, Delivers >35A


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Description
FULL DATA SHEET (PDF, 424kB)
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The MAX1638 is an ultra-high-performance, step-down DC-DC controller 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, it delivers over 35A from 1.3V 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. This controller achieves over 90% efficiency by using synchronous rectification. Flying-capacitor bootstrap circuitry drives inexpensive, external N-channel MOSFETs.

The switching frequency is pin-selectable for 300kHz, 600kHz, or 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 MAX1638 is available in 24-pin SSOP and QSOP (future package) packages, and offers additional features such as a digitally programmable output; adjustable transient response; and selectable 0.5%, 1%, or 2% AC load regulation. Fast recovery from load transients is ensured by a GlitchCatcher™ current-boost circuit that eliminates delays caused by the buck inductor. Output overvoltage protection is enforced by a crowbar circuit that turns on the low-side MOSFET with 100% duty factor when the output is 200mV above the normal regulation point. Other features include internal digital soft-start, a power-good output, and a 3.5V ±1% reference output.

Key Features   Applications/Uses
  • Better than ±1% Output Accuracy Over Line and Load
  • Greater than 90% Efficiency Using N-Channel MOSFETs
  • Pin-Selected High Switching Frequency (300kHz, 600kHz, or 1MHz)
  • Over 35A Output Current
  • Digitally Programmable Output from 1.3V to 3.5V
  • Current-Mode Control for Fast Transient Response and Cycle-by-Cycle Current-Limit Protection
  • Short-Circuit Protection with Foldback Current Limiting
  • Glitch-Catcher Circuit for Fast Load-Transient Response
  • Crowbar Overvoltage Protection
  • Power-Good (PWROK) Output
  • Digital Soft-Start
  • High-Current (2A) Drive Outputs
  • Complies with Intel VRM 8.2 Specification

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

    Key Specifications:   Step-Down Switching Regulators
    Part Number VIN (min) (V) VIN (max) (V) Min. VOUT (V) Max. VOUT (V) IOUT (A) IOUT (A) Output Adj. Method Operating Current, ICC (max) (mA) Number of DC-DC Outputs Operating Freq. (kHz) Package Smallest Available Package (max w/pins) (mm2) Price**
    MAX1638  4.5 5.5 1.3 5.5 35 35 Digital/VID
    Resistor
    2.5 1 300
    600
    1000
    SSOP/24 66 $3.85 @ 1k
    See All Step-Down Switching Regulators (252)
    Notes:
    **This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific prices and delivery, please see the price and availability page or contact an authorized distributor.

    Diagram
    MAX1638: Typical Operating Circuit
    Typical Operating Circuit

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    Document Ref.: 19-1313; Rev 1; 2005-09-26
    This page last modified: 2007-10-31


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