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Step-Down Controllers with Prebias Startup, Lossless Sensing, Synchronization, and OVP

Product Details

Key Features

Simplified Block Diagram

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Key Features

  • Prebias Startup/Monotonic
  • 1% Output Accuracy
  • Ceramic, Polymer, or Electrolytic Capacitors
  • 200kHz to 1MHz Adjustable Frequency
  • 160kHz to 1.2MHz Synchronization
  • Lossless, Foldback Current Limit
  • Overvoltage Protection
  • Enable (On/Off)
  • Adjustable Soft-Start
  • MAX8544
    • Latch-Off/Autorecovery
    • Power-OK Monitor
    • Out-of-Phase Clock Output

Applications/Uses

  • Networks and Telecom
  • Servers
  • Storage
  • Wireless Base Stations

Description

The MAX8543/MAX8544 current-mode, constant-frequency PWM buck controllers operate from a 3V to 13.2V input supply and generate adjustable 0.8V to 0.9 x VIN output voltages at loads up to 25A. They feature adjustable switching frequency and synchronization for noise-sensitive applications.

The MAX8543/MAX8544 can start with (or without) a preexisting bias on the output, without discharging the output. This feature simplifies tracking supply designs for core and I/O applications and redundant supply designs.

The MAX8543/MAX8544 use the DC resistance of the output inductor as the current-sense element for lossless, low-cost current sensing. The current-sense threshold can be set to four discrete levels to accommodate inductors with different DC resistance values.

The MAX8544 features a power-OK monitor and two MAX8544 controllers that can operate at 180° out-of-phase for dual-output applications.

Learn More About PowerMind™

Simplified Block Diagram

MAX8543, MAX8544: Typical Operating Circuit MAX8543, MAX8544: 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 .