数据手册：MAX1638 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 .pdf [英文Rev.1(PDF,424kB)]
{状况：生产中。}
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.
产品关键特性
- 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
| 应用与使用范围
- 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
|
典型工作电路
芯片订购型号
| 订购型号 | 产品状态 | 封装形式 | 工作温度 | RoHS/无铅 |
| MAX1638EAG | 生产中 | SSOP；24引脚；65.8mm²封装信息 | -40°C至+85°C | RoHS/无铅：否材料分析 |
| MAX1638EAG+ | 生产中 | SSOP；24引脚；65.8mm²封装信息 | -40°C至+85°C | RoHS/无铅：无铅材料分析 |
| MAX1638EAG+T | 生产中 | SSOP；24引脚；65.8mm²封装信息 | -40°C至+85°C | RoHS/无铅：无铅材料分析 |
| MAX1638EAG-T | 生产中 | SSOP；24引脚；65.8mm²封装信息 | -40°C至+85°C | RoHS/无铅：否材料分析 |
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