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MAX1717：动态可调、同步降压型控制器，用于笔记本CPU

业内首款单芯片、Intel SpeedStep CPU供电方案

The MAX1717 step-down controller is intended for core CPU DC-DC converters in notebook computers. It features a dynamically adjustable output, ultra-fast transient response, high DC accuracy, and high efficiency needed for leading-edge CPU core power supplies. Maxim's proprietary Quick-PWM™ quick-response, constant-on-time PWM control scheme handles wide input/output voltage ratios with ease and provides 100ns Instant-on" response to load transients while maintaining a relatively constant switching frequency. The output voltage can be dynamically adjusted through the 5-bit digital-to-analog converter (DAC) inputs over a 0.925V to 2V range. A unique feature of the MAX1717 is an internal multiplexer (mux) that accepts two 5-bit DAC settings with only five digital input pins. Output voltage transitions are accomplished with a proprietary precision slew-rate control that minimizes surge currents to and from the battery while guaranteeing "just-in-time" arrival at the new DAC setting. High DC precision is enhanced by a two-wire remote-sensing scheme that compensates for voltage drops in the ground bus and output voltage rail. Alternatively, the remote-sensing inputs can be used together with the MAX1717's high DC accuracy to implement a voltage-positioned circuit that modifies the load-transient response to reduce output capacitor requirements and full-load power dissipation. Single-stage buck conversion allows these devices to directly step down high-voltage batteries for the highest possible efficiency. Alternatively, two-stage conversion (stepping down the +5V system supply instead of the battery) at a higher switching frequency allows the minimum possible physical size. The MAX1717 is available in a 24-pin QSOP package.

关键特性 Quick-PWM Architecture ±1% VOUT Accuracy Over Line and Load 5-Bit On-Board DAC with Input Mux Precision-Adjustable VOUT Slew Control 0.925V to 2V Output Adjust Range Supports Voltage-Positioned Applications 2V to 28V Battery Input Range Requires a Separate +5V Bias Supply 200/300/550/1000kHz Switching Frequency Over/Undervoltage Protection Drives Large Synchronous-Rectifier FETs 700µA (typ) ICC Supply Current 2µA (typ) Shutdown Supply Current 2V ±1% Reference Output VGATE Transition-Complete Indicator Small 24-Pin QSOP Package

MAX1717：最简工作电路 应用 从2节至4节Li+电池产生CPU核电源的转换器 5V至CPU核电源转换器 带有Intel SpeedStep®或其它动态可调处理器的笔记本电脑

数据手册DataSheet

关键参数

开发工具

• MAX1717EVKIT

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