MAX8543

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

Data Sheet (Rev. 0)
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Overview

  • 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

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.

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Applications

  • Networks and Telecom
  • Servers
  • Storage
  • Wireless Base Stations
MAX8543
Step-Down Controllers with Prebias Startup, Lossless Sensing, Synchronization, and OVP
MAX8543, MAX8544: Typical Operating Circuit
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Documentation

Data Sheet 1

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Software Resources

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Hardware Ecosystem

Parts Product Life Cycle Description
Switching Regulators & Controllers 3
MAX1954
PRODUCTION Low-Cost, High-Frequency, Current-Mode PWM Buck Controllers
MAX1954A
PRODUCTION Low-Cost, Current-Mode PWM Buck Controller with Foldback Current Limit
MAX8546
PRODUCTION Low-Cost, Wide Input Range, Step-Down Controllers with Foldback Current Limit
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