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Low-Voltage, Precision Step-Down Controller for Portable CPU Power

Product Details

Key Features

Simplified Block Diagram

Technical Docs

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Key Features

  • ±1% DC Accuracy (Adjustable Mode)
  • Output Overvoltage Crowbar Protection
  • Output Undervoltage Shutdown
  • Adjustable Switching Frequency to 340kHz
  • Low-Dropout Operation
  • Idle Mode Pulse-Skipping Operation
  • 1.10V to 5.5V Adjustable Output Voltage
  • 2.5V/3.3V Dual-Mode Fixed-Output Settings
  • Internal Digital Soft-Start
  • 1.1V ±1% Reference Output
  • 3µA (typ) Shutdown Current
  • Open-Drain Power-Good Output (active-low RESET)
  • 20-Pin SSOP Package

Applications/Uses

  • Bus-Termination Supplies
  • Computers: Desktop, Workstation, Server
  • Notebook Computers
  • Subnotebook Computers

Description

The MAX1636 is a synchronous, buck, switch-mode, power-supply controller that generates the CPU supply voltage in battery-powered systems. It achieves ±1% output voltage accuracy and offers the excellent load-transient response needed by upcoming generations of dynamic-clock CPUs.

Up to 95% efficiency is achieved through synchronous rectification and Maxim's proprietary Idle Mode™ control scheme. Efficiency is greater than 80% over a 1000:1 load-current range, extending battery life in system-suspend or standby modes. Excellent dynamic response corrects output load transients caused by the latest dynamic-clock CPUs within five 300kHz clock cycles. Strong, 1A, on-board gate drivers ensure fast, external N-channel MOSFET switching.

The MAX1636 features a logic-controlled and synchronizable, fixed-frequency, pulse-width-modulation (PWM) operating mode that reduces noise and RF interference in sensitive mobile communications and pen-entry applications. Holding SKIP high forces fixed-frequency mode for lowest noise under all load conditions.

For a low-cost version that omits the +5V VL linear-regulator block and comes in a smaller 16-pin QSOP package, refer to the MAX1637 data sheet.

Simplified Block Diagram

MAX1636: Typical Operating Circuit MAX1636: Typical Operating 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.