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3A、低电压、降压型稳压器,内置同步整流与开关

业内尺寸最小的3A DC-DC,带有同步整流器

产品详情

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) 1.1
VOUT1 (V) (max) 3.8
IOUT1 (A) (max) 3
Switch Type Internal
Preset VOUT (V) 2.5
3.3
Output Adjust. Method Preset
Resistor
Synchronous Switching? Yes
# DC-DC Outputs 1
Switching Frequency (kHz) 350
Package/Pins SSOP/20
Budgetary
Price (See Notes)
6.57
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技术文档

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参量

主要特征

  • ±1% Output Accuracy, Including Line and Load Regulation
  • 94% Efficiency
  • Internal Switches
    • 55mΩ PMOS Power Switch
    • 60mΩ NMOS Synchronous-Rectifier Switch
  • Guaranteed 3A Load Capability
  • Minimal External Components
  • Pin-Selectable Fixed 3.3V, 2.5V, or Adjustable (1.1V to 3.8V) Output Voltage
  • 4.5V to 5.5V Input Voltage Range
  • 400µA (typ) Supply Current
  • <1µA Shutdown Supply Current
  • Constant-Off-Time PWM Operation
  • Switching Frequencies Up to 350kHz
  • Idle Mode™ Operation at Light Loads
  • Thermal Shutdown Protection
  • Available in 20-Pin SSOP

应用/用途

  • 5V至3.3V转换
  • CPU子卡电源
  • 台式计算机总线端接电源
  • DSP电源
  • 笔记本电脑CPU I/O电源

描述

The MAX1623 switch-mode buck regulator with synchronous rectification provides local CPU and bus-termination power in notebook and desktop computers. An internal 55mΩ (typ), 3A PMOS power switch and 60mΩ (typ), 3A NMOS synchronous-rectifier switch deliver continuous load currents up to 3A from a 5V supply with 95% typical efficiency. Output accuracy is ±1%, including line and load regulation.

The MAX1623 features constant-off-time, current-mode pulse-width-modulation (PWM) control with switching frequencies as high as 350kHz. An external resistor at the TOFF pin sets the off-time, allowing optimum design flexibility in terms of switching frequency, output switching noise, and inductor size. This device is available in a space-saving 20-pin SSOP package.

简化框图

MAX1623:典型工作电路 MAX1623:典型工作电路 Zoom icon

技术文档

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