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
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
语言下载文件备注
英文MAX1638.pdfRev 1; 09/2005
关键参数
Part NumberVIN
(V)
VIN
(V)
VOUT1
(V)
VOUT1
(V)
Output Adjust. MethodIOUT1
(A)
Switch TypeSynchronous SwitchingDC-DC OutputsOper. Freq.
(kHz)
Package/PinsBudgetary
Price
minmaxminmaxmaxSee Notes
MAX16384.55.51.33.5
  • Digital/VID
  • Resistor
35ExternalYes1
  • 300
  • 600
  • 1000
SSOP/24$4.78 @1k
开发工具
技术资料
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订购型号
型号状况推荐替代产品封装温度RoHS/无铅
MAX1638EAG停止供货MAX1638EAG+SSOP,;24引脚;65.8mm²-40°C至+85°CRoHS/无铅:否
MAX1638EAG+生产中SSOP,;24引脚;65.8mm²-40°C至+85°CRoHS/无铅:无铅
MAX1638EAG+T生产中SSOP,;24引脚;65.8mm²-40°C至+85°CRoHS/无铅:无铅
MAX1638EAG-T停止供货MAX1638EAG+TSSOP,;24引脚;65.8mm²-40°C至+85°CRoHS/无铅:否
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典型工作电路 MAX1638