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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) | 300 600 1000 |
Package/Pins | SSOP/24 |
Budgetary Price (See Notes) | 5.42 |
缩小
简化框图
Technical Docs
数据资料 | 高速、同步整流、降压型控制器,用于CPU电源 | Sep 26, 2005 | |
应用笔记 | Power Supplies for Telecom Systems |
支持和培训
采样:
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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) | 300 600 1000 |
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.
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.
Technical Docs
数据资料 | 高速、同步整流、降压型控制器,用于CPU电源 | Sep 26, 2005 | |
应用笔记 | Power Supplies for Telecom Systems |
支持和培训
采样:
选择上方“样片”按钮将重定向至第三方ADI样片网站。登录后,所选部件将转移到您在此网站上的购物车。如果您之前从未使用过此网站,请创建一个新帐户。有关此样片网站的任何问题,请联系SampleSupport@analog.com。