Analog Devices MAX8544 Product Info

• 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 V_IN 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.

Applications

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