MAX1855中文资料高速、数字可调、同步降压型控制器，集成电压定位电路数据手册ADI规格书

描述 Description

The MAX1716/MAX1854/MAX1855 step-down controllers are intended for core CPU DC-DC converters in notebook computers. They feature a dynamically adjustable output (5-bit DAC), 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 MAX1716/MAX1854/MAX1855 are designed specifically for CPU core applications requiring a voltage-positioned supply. The voltage-positioning input (VPS), combined with a high DC accuracy control loop, is used to implement a power supply that modifies its output set point in response to the load current. This arrangement decreases full-load power dissipation and reduces the required number of output capacitors.
The 28V input range of the MAX1716/MAX1854/MAX1855 enables single-stage buck conversion from high-voltage batteries for the maximum possible efficiency. Alternatively, the devices' high-frequency capability combined with two-stage conversion (stepping down the +5V system supply instead of the battery) allows the smallest possible physical size. The output voltage can be dynamically adjusted through the 5-bit digital-to-analog converter (DAC) inputs.
The MAX1716/MAX1854/MAX1855 are available in a 24-pin QSOP package. For applications requiring SpeedStep® power control (see the MAX1717).

特性 Features

• Quick-PWM Architecture
• Adjustable Output Range (5-Bit DAC)
• MAX1854: 0.925V to 2.0V
• 2V to 28V Input Range
• Output Undervoltage Protection
• Drive Large Synchronous-Rectifier MOSFETs
• 700µA ICC Supply Current
• 2V ±1% Reference Output
• Small 24-Pin QSOP Package

应用 Application

• 计算机：台式机、工作站和服务器
• 服务器
• 工作站