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MAX1639 - High-Speed Step-Down Controller

General Description

The MAX1639 is an ultra-high-performance, step-down DC-DC controller for CPU power in high-end computer systems.

Key Features

  • include internal digital soft-start, a power-good output, and a 3.5V ±1% reference output. The MAX1639 is available in a 16-pin narrow SOIC package. ____________________________Features o Better than ±1% Output Accuracy Over Line and Load o Greater than 90% Efficiency Using N-Channel MOSFETs o Pin-Selected High Switching Frequency: 300kHz, 600kHz, or 1MHz o Over 35A Output Current o Resistor-Divider Adjustable Output from 1.1V to 4.5V o Current-Mode Control for Fast Transient Response and Cycle.

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Full PDF Text Transcription (Reference)

The following content is an automatically extracted verbatim text from the original manufacturer datasheet and is provided for reference purposes only.

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19-1337; Rev 0; 2/98 KIT ATION EVALU E L B A AVAIL High-Speed Step-Down Controller with Synchronous Rectification for CPU Power ________________General Description The MAX1639 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 1.1V to 4.5V 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.