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三输出电源控制器,用于笔记本电脑

系统级供电方案,用于笔记本电脑

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主要特征

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主要特征

  • Dual PWM Buck Controllers (+3.3V and +5V)
  • Dual PCMCIA VPP Outputs (0V/5V/12V)
  • Three Precision Comparators or Level Translators
  • 95% Efficiency
  • 420µA Quiescent Current; 70µA in Standby (linear regulators alive)
  • 5.5V to 30V Input Range
  • Small SSOP Package
  • Fixed Output Voltages Available:
    • 3.3 (standard)
    • 3.45 (High-Speed Pentium™)
    • 3.6 (PowerPC™)

应用/用途

  • 通信系统
  • 笔记本电脑
  • 笔输入系统
  • 便携式数据终端

描述

The MAX782 is a system-engineered power-supply controller for notebook computers or similar battery-powered equipment. It provides two high-performance step-down (buck) pulse-width modulators (PWMs) for +3.3V and +5V, and dual PCMCIA VPP outputs powered by an integral flyback winding controller. Other functions include dual, low-dropout, micropower linear regulators for CMOS/RTC backup, and three precision low-battery-detection comparators.

High efficiency (95% at 2A; greater than 80% at loads from 5mA to 3A) is achieved through synchronous rectification and PWM operation at heavy loads, and Idle-Mode™ operation at light loads. It uses physically small components, thanks to high operating frequencies (300kHz/200kHz) and a new current-mode PWM architecture that allows for output filter capacitors as small as 30µF per ampere of load. Line- and load-transient response are terrific, with a high 60kHz unity-gain crossover frequency allowing output transients to be corrected within four or five clock cycles. Low system cost is achieved through a high level of integration and the use of low-cost, external N-channel MOSFETs. The integral flyback winding controller provides a low-cost, +15V high-side output that regulates even in the absence of a load on the main output.

Other features include low-noise, fixed-frequency PWM operation at moderate to heavy loads and a synchronizable oscillator for noise-sensitive applications such as electromagnetic pen-based systems and communicating computers. The MAX782 is a monolithic BiCMOS IC available in fine-pitch, SSOP surface-mount packages.

简化框图

MAX782、MAX782R、MAX782S:典型应用电路 MAX782、MAX782R、MAX782S:典型应用电路 Zoom icon

Technical Docs

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在Maxim的知识库中搜索技术问题的答案

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