回到顶部

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

产品详情

主要特征

应用/用途

Parametric specs for Step-Down Switching Regulators
VIN (V) (min) 4.5
VIN (V) (max) 5.5
VOUT1 (V) (min) 1.3
VOUT1 (V) (max) 3.5
IOUT1 (A) (max) 35
Switch Type External
Output Adjust. Method Digital/VID
Resistor
Synchronous Switching? Yes
# DC-DC Outputs 1
Switching Frequency (kHz) 1000
300
600
Package/Pins SSOP/24
Budgetary
Price (See Notes)
5.42
查看更多

简化框图

技术文档

支持和培训

在Maxim的知识库中搜索技术问题的答案

过滤搜索

Maxim的专业工程师团队也会为您解答相应的技术问题,请访问Maxim的 支持中心

参量

Parametric specs for Step-Down Switching Regulators
VIN (V) (min) 4.5
VIN (V) (max) 5.5
VOUT1 (V) (min) 1.3
VOUT1 (V) (max) 3.5
IOUT1 (A) (max) 35
Switch Type External
Output Adjust. Method Digital/VID
Resistor
Synchronous Switching? Yes
# DC-DC Outputs 1
Switching Frequency (kHz) 1000
300
600
Package/Pins SSOP/24
Budgetary
Price (See Notes)
5.42

主要特征

  • 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

应用/用途

  • 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

描述

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.

简化框图

MAX1638:典型工作电路 MAX1638:典型工作电路 Zoom icon

技术文档

支持和培训

在Maxim的知识库中搜索技术问题的答案

过滤搜索

Maxim的专业工程师团队也会为您解答相应的技术问题,请访问Maxim的 支持中心