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

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

Product Details

Key Features

Simplified Block Diagram

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Key Features

  • 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

Applications/Uses

  • DSP, ASIC, µP, and FPGA Supplies
  • Servers
  • Telecom and Network Equipment
  • Wireless Base Stations

Description

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.

Simplified Block Diagram

MAX1955, MAX1956: Typical Operating Circuit MAX1955, MAX1956: 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 .