Features and Benefits

  • Expands Up to Four Phases per Chip
  • Up to 80V Input or Output Voltage
  • Cascade with Multiple Chips for Very High Current Applications
  • Supports Up to 18 Distinct Phases from 20° to 180°
  • Phases Can Share Phase Angle
  • Excellent DC and Transient Current Sharing
  • Phase-Lockable Fixed Frequency 125kHz to 1MHz
  • Supports Bidirectional Current Flow 
  • RSENSE or DCR Current Sensing
  • Eliminates the Need to Route Sensitive Feedback and Control Signals
  • 52-Lead (7mm × 8mm) QFN Package

Product Details

The LT8550 is a multiphase expander for synchronous buck DC/DC converters. It operates in tandem with any buck DC/DC converter to increase the load current capability by adding additional phases, which are clocked outof-phase to reduce ripple current and filtering capacitance. It easily adds phases without the need to route sensitive feedback and control signals.

The LT8550 integrates gate drivers and can support up to four buck phases per device. Multiple LT8550’s can be used for up to 18 phases. It accurately monitors and adjusts the current of each channel to achieve excellent DC and transient current sharing.

The LT8550 operates over a fixed frequency from 100kHz to 1MHz, or can be synchronized to an external clock. 



  • High Current Distributed Power Systems
  • Telecom, Datacom, and Storage Systems
  • Industrial and Automotive

Product Lifecycle icon-recommended Recommended for New Designs

This product has been released to the market. The data sheet contains all final specifications and operating conditions. For new designs, ADI recommends utilization of these products.

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ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well.  "Zero defects" for shipped products is always our goal.

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The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Analog Devices, Inc. sales office or authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.

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