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MAX1638：高速、同步整流、降压型控制器，用于CPU电源

业内尺寸最小、响应速度最快的Pentium® Pro/Pentium II电源，可提供> 35A的电流

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.

关键特性 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

MAX1638：典型工作电路 应用 计算机：台式机、工作站和服务器 GTL总线端接 LAN服务器 Pentium® 工作站

数据手册DataSheet

关键参数

开发工具

• MAX1638EVKIT

技术资料

• Power Supplies for Telecom Systems

相关产品

• MAX1639：高速、同步整流、降压型控制器，用于CPU电源
• MAX1624：高速、同步整流、降压型控制器，用于CPU电源

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