1.6V to 5.5V Input, 0.5% Accurate, Dual 180° Out-of-Phase Step-Down Controllers

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Industry's First 0.5%-Accurate, 1.6V to 5.5V Input, Dual-Output, Step-Down DC-DC Controllers

Part Details
  • Operates from a 1.6V to 5.5V Supply (MAX1956)
  • 0.5% Output Accuracy
  • 0.8V to 0.9VIN Output Range
  • Up to 25A per Phase Output Current
  • On-Chip Boost Regulator Provides 5V Gate Drive
  • Up to 93% Efficiency
  • 180° Out-of-Phase Operation
  • ±4% Voltage Margining
  • Lossless, Foldback Current Limit
  • Selectable Voltage Sequencing
  • Synchronizable to External Clock
  • Digital Soft-Start and Soft-Stop
  • Small 28-Pin, 5mm x 5mm Thin QFN Package
Additional Details
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The MAX1955/MAX1956 are dual-output, fixed-frequency, voltage-mode, pulse-width modulated (PWM) step-down controllers with 0.5% output accuracy. Each controller switches at a constant 600kHz and is 180° out-of-phase with the other controller, reducing input ripple current and the number of input capacitors.

An on-chip bias supply generates a 5V gate drive to deliver up to 25A output current per phase with low-cost N-channel MOSFETs at up to 93% efficiency. Lossless adjustable current limit eliminates expensive current-sense resistors and improves efficiency. Foldback current limit reduces power dissipation during short-circuit conditions and handles transient overloads better than controllers using hiccup-mode short-circuit protection.

Output voltage margining shifts output voltage by ±4% from the nominal value to simplify system test. Outputs also can be powered up and down in selectable sequences to meet core and logic supply-rail requirements.

The MAX1955/MAX1956 are available in a 28-lead thin QFN package with exposed pad.


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