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动态可调、同步降压型控制器,集成电压定位电路

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主要特征

Parametric specs for Step-Down Switching Regulators
VIN (V) (min) 2
VIN (V) (max) 28
VOUT1 (V) (min) 0.6
VOUT1 (V) (max) 2
IOUT1 (A) (max) 22
Switch Type External
Output Adjust. Method Digital/VID
Synchronous Switching? Yes
Power Good Signal Yes
# DC-DC Outputs 1
Switching Frequency (kHz) 300
Package/Pins QSOP/28
Budgetary
Price (See Notes)
0
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参量

Parametric specs for Step-Down Switching Regulators
VIN (V) (min) 2
VIN (V) (max) 28
VOUT1 (V) (min) 0.6
VOUT1 (V) (max) 2
IOUT1 (A) (max) 22
Switch Type External
Output Adjust. Method Digital/VID
Synchronous Switching? Yes
Power Good Signal Yes
# DC-DC Outputs 1
Switching Frequency (kHz) 300
Package/Pins QSOP/28
Budgetary
Price (See Notes)
0

主要特征

  • High-Efficiency Voltage Positioning
  • Quick-PWM Architecture
  • ±1% VOUT Accuracy Over Line
  • Adjustable Output Slew Rate
  • 0.600V to 2V Adjustable Output Range (5-Bit DAC)
  • 2V to 28V Battery Input Range
  • 200/300/600/1000kHz Switching Frequency
  • Output Undervoltage and Overvoltage Protection
  • Drives Large Synchronous-Rectifier MOSFETs
  • ±20% Accurate Current-Limit
  • 10µA Shutdown Supply Current
  • 2V ±1% Reference Output
  • Power-Good (PGOOD) Indicator
  • Small 28-Pin QSOP Package

应用/用途

  • CPU核电源
  • 坞站
  • 笔记本电脑(IMVP-II/Coppermine)
  • 单级(电池至VCORE)变换器
  • 两级(+5V至VCORE)变换器

描述

The MAX1813 step-down controller is intended for core CPU DC-DC converters in notebook computers. The controller features a dynamically adjustable output (5-bit DAC), ultra-fast transient response, high DC accuracy, and high efficiency necessary 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 MAX1813 is designed specifically for CPU core applications requiring a voltage-positioned supply. The voltage-positioning input (VPCS), 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 output voltage can be dynamically adjusted through the 5-bit digital-to-analog converter (DAC) inputs over a 0.600V to 2V range. The MAX1813 includes an internal multiplexer that selects between three different DAC code settings. The first two inputs are controlled by five digital input pins (D0–D4). The third input is used for the suspend mode and controlled by two 4-level input pins (S0, S1). 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.

The MAX1813's 28V input range enables single-stage buck conversion from high-voltage batteries for the maximum possible efficiency. Alternatively, the controller's 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 MAX1813 is available in a 28-pin QSOP package.

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Technical Docs

支持和培训

在Maxim的知识库中搜索技术问题的答案

过滤搜索

Maxim的专业工程师团队也会为您解答相应的技术问题,请访问Maxim的 支持中心