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MAX782, MAX782R, MAX782S

Triple-Output Power Supply Controller for Notebook Computers

System-Engineered Power Supply for Notebook Computers

Product Details

Key Features

Simplified Block Diagram

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Key Features

  • 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™)

Applications/Uses

  • Communication Systems
  • Notebook Computers
  • Pen-Entry Systems
  • Portable Data Terminals

Description

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.

Simplified Block Diagram

MAX782, MAX782R, MAX782S: Typical Application Circuit MAX782, MAX782R, MAX782S: Typical Application Circuit Zoom icon

Technical Docs

Support & Training

Search our knowledge base for answers to your technical questions.

Filtered Search

Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal .

Sampling:
Selecting the Sample button above will redirect to the third-party ADI Sample Site. The part selected will carry over to your cart on this site once logged in. Please create a new account there if you have never used the site before. Contact SampleSupport@analog.com with any questions regarding this Sample Site.