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4.5V to 28V Input Current-Mode Step-Down Controller with Adjustable Frequency

Wide Input Voltage Range with Programmable Foldback Current Limit

Product Details

Key Features

Simplified Block Diagram

Technical Docs

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Key Features

  • Operates from 4.5V to 28V Supply
  • 1% FB Voltage Accuracy Over Temperature
  • Adjustable Output Voltage Down to 0.7V or REFIN
  • Adjustable Switching Frequency or External Synchronization from 200kHz to 1.2MHz
  • 180° Phase-Shifted Clock Output
  • Adjustable Overcurrent Limit
  • Adjustable Foldback Current Limit
  • Adjustable Slope Compensation
  • Selectable Current-Limit Mode: Latch-Off or Automatic Recovery
  • Monotonic Output-Voltage Rise at Startup
  • Output Sources and Sinks Current
  • Enable Input
  • Power-OK (POK) Output
  • Adjustable Soft-Start
  • Independently Adjustable Overvoltage Protection

Applications/Uses

  • Base Stations
  • DDR
  • IBA Applications
  • Network and Telecom
  • Power Modules
  • Servers
  • Storage

Description

The MAX8650 synchronous PWM buck controller operates from a 4.5V to 28V input and generates an adjustable 0.7V to 5.5V output voltage at loads up to 25A.

The MAX8650 uses a peak current-mode control architecture with an adjustable (200kHz to 1.2MHz) constant switching frequency and is externally synchronizable. The IC's current limit uses the inductor's DC resistance to improve efficiency or an external sense resistor for high accuracy. The current-limit threshold is adjusted with an external resistor. Foldback-type current limit can be implemented to reduce the power dissipation in overload or short-circuit conditions. Short-circuit protection is provided based on sensing the current in the low-side MOSFET. A reference input is provided for use with a high-accuracy external reference or for double-data-rate (DDR)-tracking applications.

Monotonic prebiased startup is available for a safe-start in applications where the output capacitor may have an initial charge. This feature prevents the output from pulling low during startup, which is a common characteristic of conventional buck regulators.

A 180° out-of-phase synchronization output is available for synchronizing with another converter.

Simplified Block Diagram

MAX8650: Typical Operating Circuit MAX8650: 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.