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Multi-phases DC-DC Regulator

Multi-phases DC-DC Regulator

In today’s computing environment, the complexity of CPUs, FPGAs, ASICs, and even peripherals are increasing everyday. At the same time, their power transmission requirements are also the same. In order to meet these higher requirements, multi-phase regulators come in place. It is becoming more and more common to use these on motherboards, in computing fields from laptops and tablets to servers, and Ethernet switch. Designing with these regulators is very challenging compare of using traditional switches and linear regulators, but the benefits of multiphase outweigh the complexity of high-performance power supplies application. With the dual-channel buck converter IC series from HTT product series, multi-phase DC-DC is much easier to be implemented in a single chip, thus making the HTT solution unique, small, and easy-to-use. The following is our brief introduction for showing the benefits and using of multiphase DC-DC, as well as the benefits of using the HTT chipset to achieve Dual or Multiphase functions.




Graphics Card


Ethernet Switch


5G Equipment

Technology Overview
  • Faster respond 

  • Lower components stress

  • Reduced input capacitance

  • Reduced output capacitance

  • Improved thermal performance and efficiency at high load currents

  • Improved overshoot and undershoot during load transients


Example of a two-phase buck regulator

  • Two parallel set of buck converter

  • The switching between two converters is 180° out of phase

Advantages of two-phase buck regulator

  • PH1 lin is the inductor current of buck converter 1

  • PH2 lin is the inductor current of buck converter 2

  • PH1 lin and PH2 lin are 180° out of phase 

  • The peak input current of the 2 phases converter are reduced

  • Compare with 1 phase buck converter, 2 phases buck converter reduced the normalized input capacitance RMS current by half

  • The input capacitance required is reduced


  • The output current is shared by the inductor L1 and inductor L2

  • The peak current of each inductor are reduced

  • The loss of the inductor are reduced


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