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Multiphase Master with PMBus Interface and Internal Buck Converter

Product Details

The MAX20751 PMBus-compliant multiphase master IC, with extensive status and parameter monitoring, is capable of driving up to four smart-slave integrated power devices.

Utilizing Maxim’s smart-slave ICs, the device provides a high-density and flexible solution that can be tailored to a range of power loads used in communication equipment. Proprietary-coupled inductors, recommended to reduce the effective inductor value without excessive ripple current, results in improved transient response and reduction in the number of output capacitors required.

The device incorporates current reporting, temperature monitoring, fault detection, and PMBus support. Overcurrent and overtemperature faults are detected by the individual smart slaves and faults communicated through the master IC. The highest junction temperature is reported, both before and after smart-slave regulation.

The device features an integrated switching regulator that can optionally be used to supply the VDD rail for the master controller and smart-slave devices to reduce the power-rail requirements and simplify the regulator design.

Key Features

  • Increased Power Density with Fewer External Components Needed
    • Scalable, Multiphase Solution
    • Compatibility with Coupled Inductors Enables Fast Transient Response and Reduced COUT
    • Integrated Internal Switching Regulator to Power Smart Slaves
  • Optimized Component Performance and Efficiency with Reduced Design-In Time
    • PMBus-Compliant Interface for Telemetry and Power Management
    • Field-Programmable Memory to Allow Storage of Desired Configuration Parameters
    • Fault Logging
  • Comprehensive System and IC Self-Protection Features Promote Increased Power-Supply Reliability
    • Overcurrent and Overtemperature
    • Boost Voltage UVLO
    • VX Short to Ground or VDDH Detection
    • Phase-Current Steering for Thermal Balancing
  • 36-Pin (6mm × 6mm) QFN Package

Applications/Uses

  • Communication, Networking, Servers, and Storage Equipment: ASICs, Memory VDDQ, Microprocessor Chipsets, and other High-Current Digital ICs
Parametric specs for Step-Down Switching Regulators
VIN (V) (min) 1.71
VIN (V) (max) 3.63
VOUT1 (V) (min) 0.5
VOUT1 (V) (max) 1.52
IOUT1 (A) (max) 120
Switch Type External
Output Adjust. Method Digital/VID
Resistor
Synchronous Switching? Yes
Power Good Signal Yes
# DC-DC Outputs 1
Switching Frequency (kHz) 800
Design Tools EE-Sim
Package/Pins SAWN QFN/36
Budgetary
Price (See Notes)
$3.39 @1k
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Simplified Block Diagram

MAX20751: Typical Operating Circuit MAX20751: Typical Operating Circuit Zoom icon

Technical Docs

Design & Development

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Description

The MAX20751S1VKIT# evaluation kit (EV kit) is a proven application-circuit design for the MAX20751 DC-DC power-supply controller and the VT1697SB power train. The EV kit is a programmable-output, 4-phase switching regulator with a PMBus™ interface. The IC controls up to four power trains to generate a single output voltage. The EV kit can be used as a stand-alone board, if desired. However, to take full advantage of the IC’s capabilities, the user must connect the EV kit to a PC using the MAXPOWERTOOL002 (PowerTool™), Maxim’s USB-to-PMBus interface dongle for power products. The PowerTool is Windows XP-®, Windows Vista-®, and Windows 7-compatible software that provides a simple graphical user interface (GUI) for exercising the features of the IC. The PowerTool GUI allows a PC to control the PMBus interface and to collect real-time data from the EV kit.

The EV kit contains a fully functional PCB assembly and is capable of delivering up to 100W of continuous 0.6V to 1.52V power output from a 7V to 16V input supply.

The PowerTool is sold separately and contains a USB cable (to connect PC to dongle) and a ribbon cable (to connect dongle to EV kit).

The EV kit also evaluates the VT1697SB smart slave IC with integrated current and temperature sensors. The VT1697SB is a features-rich smart slave IC designed to work with Maxim’s master switch-mode power-supply controller to implement a high-density multiphase voltage regulator.

View Details

Features

  • MAX20751 Master Switch-Mode Controller
  • Up to Four Interleaved Power Stages
  • Up to 100A Output Current
  • PMBus Interface
  • Digital Telemetry and Control
  • Patented Synchronous Buck Topology Using Coupled Inductors
  • Smaller Size
  • Higher Efficiency
  • Reduced Output Capacitance
  • 300kHz to 800kHz Switching Frequency
  • 7V to 16V Input Voltage Range
  • All Ceramic Capacitor Output Capacitors
  • Proven PCB Layout
  • Fully Assembled and Tested

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Parameters

Parametric specs for Step-Down Switching Regulators
VIN (V) (min) 1.71
VIN (V) (max) 3.63
VOUT1 (V) (min) 0.5
VOUT1 (V) (max) 1.52
IOUT1 (A) (max) 120
Switch Type External
Output Adjust. Method Digital/VID
Resistor
Synchronous Switching? Yes
Power Good Signal Yes
# DC-DC Outputs 1
Switching Frequency (kHz) 800
Design Tools EE-Sim
Package/Pins SAWN QFN/36
Budgetary
Price (See Notes)
$3.39 @1k

Key Features

  • Increased Power Density with Fewer External Components Needed
    • Scalable, Multiphase Solution
    • Compatibility with Coupled Inductors Enables Fast Transient Response and Reduced COUT
    • Integrated Internal Switching Regulator to Power Smart Slaves
  • Optimized Component Performance and Efficiency with Reduced Design-In Time
    • PMBus-Compliant Interface for Telemetry and Power Management
    • Field-Programmable Memory to Allow Storage of Desired Configuration Parameters
    • Fault Logging
  • Comprehensive System and IC Self-Protection Features Promote Increased Power-Supply Reliability
    • Overcurrent and Overtemperature
    • Boost Voltage UVLO
    • VX Short to Ground or VDDH Detection
    • Phase-Current Steering for Thermal Balancing
  • 36-Pin (6mm × 6mm) QFN Package

Applications/Uses

  • Communication, Networking, Servers, and Storage Equipment: ASICs, Memory VDDQ, Microprocessor Chipsets, and other High-Current Digital ICs

Description

The MAX20751 PMBus-compliant multiphase master IC, with extensive status and parameter monitoring, is capable of driving up to four smart-slave integrated power devices.

Utilizing Maxim’s smart-slave ICs, the device provides a high-density and flexible solution that can be tailored to a range of power loads used in communication equipment. Proprietary-coupled inductors, recommended to reduce the effective inductor value without excessive ripple current, results in improved transient response and reduction in the number of output capacitors required.

The device incorporates current reporting, temperature monitoring, fault detection, and PMBus support. Overcurrent and overtemperature faults are detected by the individual smart slaves and faults communicated through the master IC. The highest junction temperature is reported, both before and after smart-slave regulation.

The device features an integrated switching regulator that can optionally be used to supply the VDD rail for the master controller and smart-slave devices to reduce the power-rail requirements and simplify the regulator design.

Simplified Block Diagram

MAX20751: Typical Operating Circuit MAX20751: 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