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Dual-Phase Scalable Integrated Voltage Regulator with PMBus Interface

Smallest, High Efficiency, 60A Fully Integrated Two-Phase Switching Voltage Regulator

Product Details

The MAX20796 offers a fully integrated, highly efficient, two-phase switching regulator for applications operating from 4.5V to 16V and requiring up to 60A maximum load or 90A with an optional third-phase external power stage. The output voltage range can be configured from 0.5V to 5.5V with some restrictions on duty cycle. The switching regulator uses a fixed-frequency control scheme providing an extremely compact, fast, and accurate power delivery solution for server and telecom applications. Integrated linear regulators allow single-supply operation. To further improve system efficiency and thermal performance, an external 3.3V supply or FET can be used to generate the core supply.

Key system parameters are configured by external resistors, including the selection of soft-start timing, output voltage, switching frequency, PMBus address, overcurrent trip point, and loop control parameters. The device operates with either coupled or discrete inductors. Coupled inductor technology offers high performance with a minimum number of input and output capacitors for best-in-class solution cost.

The MAX20796 includes fault protection and reporting capabilities. Inherent positive and negative overcurrent and overtemperature protection ensure a rugged design. Input undervoltage lockout shuts down the device when the input voltage is out of specification. Regulation is halted if the output voltage is outside of a programmable range. A PGOOD pin provides an output signal to show that the output voltage is within range and the system is regulating.

The MAX20796 is offered in a 35-pin, 4 × 10.5mm FC2QFN package, ideal for use in networking and communication end equipment.

The device is also available as MAX20796A, which is preconfigured for a 1V, 800kHz application with LEAD_LAG enabled.

Key Features

  • Peak Efficiency 92%; Full-Load Efficiency 90% at VIN = 12V, VOUT = 1V
  • Operating Input Voltage Range 4.5V to 16V
  • Output Voltage Range is 0.5V to 5.5V
  • Output Boot Voltage Pin-Strapped Range 0.5V to 5.0V with Direct Feedback
  • Integrated Loop Compensation
  • Supports Coupled and Discrete Inductors
  • PMBus Revision 1.3 Compliant Interface
  • Supports External Power Stage to Increase Power Capacity
  • Internal Linear Regulators Allow Operation from One Supply Voltage
  • Optional External LDO FET for Enhanced Thermal Performance
  • Pin-Strapped Configurable Operating Parameters:
    • 32 PMBus Addresses
    • Output Voltage
    • Switching Frequency
    • Overcurrent Protection (OCP) Threshold
    • Soft-Start Time
    • Loop Compensation
  • Supports Nonvolatile PMBus Command Storage (Five Writes Available)
  • Continuous Conduction Mode Operation Only
  • Integrated Accurate Current and Temperature Sensing
  • Monotonic Startup and Shutdown, Supports Prebias Startup (Two-Phase)
  • Fast Peak and Average Overcurrent Protection
  • Active-Low RESTORE Input Pin Resets Output Voltage
  • Operating Junction Temperature Range: -40°C to 125°C
  • Package: 35-pin, 4 ×10.5mm, 0.5mm pitch, FC2QFN

Applications/Uses

  • Communication, Networking, Servers and Storage Equipment
  • I/O and Auxiliary Power
  • Memory VDDQ
  • Microprocessor Chipsets
  • Point-of-Load Voltage Regulators
Parametric specs for Step-Down (Buck) Switching Regulators
VIN (V) (min) 4.5
VIN (V) (max) 16
VOUT1 (V) (min) 0.5
VOUT1 (V) (max) 5.5
IOUT1 (A) (max) 60
Output Adjust. Method Preset or Adj
Synchronous Switching Yes
Power Good Signal Yes
ICC (mA) (typ) 1
# DC-DC Outputs 1
Switching Frequency (kHz) 800
Package/Pins FC2QFN/35
Budgetary
Price (See Notes)
$6.49 @1k
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Simplified Block Diagram

MAX20796: Simplified Application Schematic MAX20796: Simplified Application Schematic Zoom icon

Technical Docs

Design & Development

Click any title below to view the detail page where available.

Description

The MAX20796 Discrete Inductor evaluation kit (EV kit) provides a proven design to evaluate the MAX20796 fully-integrated, two-phase switching regulator. The MAX20766 can be installed on the EV kit for a three-phase switching regulator operation. The EV kit operates from a 4.5V to 16V input voltage range and supports an output voltage range of 1.8V to 5V. The board uses the MAX20796 on a proven eight-layer PCB design.

View Details

Features

  • 4.5V to 16V Input Voltage Range
  • 1.8V to 5V Output Voltage Range
  • Banana Jacks for Input and Output Voltage
  • SMB Coaxial Cable Jacks for Output Voltage Measurement and SYNC Clock Input and Output
  • Configurable Output Voltage and Compensation Parameters
  • Adjustable Current Limit
  • PMBus Header for Connection to the MAXPOWERTOOL002# Dongle
  • FAULT and PG Outputs
  • Enable Input and Enable Debounce Circuit
  • Fully Assembled and Tested

Description

The MAX20796 Discrete Inductor evaluation kit (EV kit) provides a proven design to evaluate the MAX20796 fully-integrated, two-phase switching regulator. The MAX20766 can be installed on the EV kit for a three-phase switching regulator operation. The EV kit operates from a 4.5V to 16V input voltage range and supports an output voltage range of 1.8V to 5V. The board uses the MAX20796 on a proven eight-layer PCB design.

View Details

Features

  • 4.5V to 16V Input Voltage Range
  • 1.8V to 5V Output Voltage Range
  • Banana Jacks for Input and Output Voltage
  • SMB Coaxial Cable Jacks for Output Voltage Measurement and SYNC Clock Input and Output
  • Configurable Output Voltage and Compensation Parameters
  • Adjustable Current Limit
  • PMBus Header for Connection to the MAXPOWERTOOL002# Dongle
  • FAULT and PG Outputs
  • Enable Input and Enable Debounce Circuit
  • Fully Assembled and Tested

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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.

Parameters

Parametric specs for Step-Down (Buck) Switching Regulators
VIN (V) (min) 4.5
VIN (V) (max) 16
VOUT1 (V) (min) 0.5
VOUT1 (V) (max) 5.5
IOUT1 (A) (max) 60
Output Adjust. Method Preset or Adj
Synchronous Switching Yes
Power Good Signal Yes
ICC (mA) (typ) 1
# DC-DC Outputs 1
Switching Frequency (kHz) 800
Package/Pins FC2QFN/35
Budgetary
Price (See Notes)
$6.49 @1k

Key Features

  • Peak Efficiency 92%; Full-Load Efficiency 90% at VIN = 12V, VOUT = 1V
  • Operating Input Voltage Range 4.5V to 16V
  • Output Voltage Range is 0.5V to 5.5V
  • Output Boot Voltage Pin-Strapped Range 0.5V to 5.0V with Direct Feedback
  • Integrated Loop Compensation
  • Supports Coupled and Discrete Inductors
  • PMBus Revision 1.3 Compliant Interface
  • Supports External Power Stage to Increase Power Capacity
  • Internal Linear Regulators Allow Operation from One Supply Voltage
  • Optional External LDO FET for Enhanced Thermal Performance
  • Pin-Strapped Configurable Operating Parameters:
    • 32 PMBus Addresses
    • Output Voltage
    • Switching Frequency
    • Overcurrent Protection (OCP) Threshold
    • Soft-Start Time
    • Loop Compensation
  • Supports Nonvolatile PMBus Command Storage (Five Writes Available)
  • Continuous Conduction Mode Operation Only
  • Integrated Accurate Current and Temperature Sensing
  • Monotonic Startup and Shutdown, Supports Prebias Startup (Two-Phase)
  • Fast Peak and Average Overcurrent Protection
  • Active-Low RESTORE Input Pin Resets Output Voltage
  • Operating Junction Temperature Range: -40°C to 125°C
  • Package: 35-pin, 4 ×10.5mm, 0.5mm pitch, FC2QFN

Applications/Uses

  • Communication, Networking, Servers and Storage Equipment
  • I/O and Auxiliary Power
  • Memory VDDQ
  • Microprocessor Chipsets
  • Point-of-Load Voltage Regulators

Description

The MAX20796 offers a fully integrated, highly efficient, two-phase switching regulator for applications operating from 4.5V to 16V and requiring up to 60A maximum load or 90A with an optional third-phase external power stage. The output voltage range can be configured from 0.5V to 5.5V with some restrictions on duty cycle. The switching regulator uses a fixed-frequency control scheme providing an extremely compact, fast, and accurate power delivery solution for server and telecom applications. Integrated linear regulators allow single-supply operation. To further improve system efficiency and thermal performance, an external 3.3V supply or FET can be used to generate the core supply.

Key system parameters are configured by external resistors, including the selection of soft-start timing, output voltage, switching frequency, PMBus address, overcurrent trip point, and loop control parameters. The device operates with either coupled or discrete inductors. Coupled inductor technology offers high performance with a minimum number of input and output capacitors for best-in-class solution cost.

The MAX20796 includes fault protection and reporting capabilities. Inherent positive and negative overcurrent and overtemperature protection ensure a rugged design. Input undervoltage lockout shuts down the device when the input voltage is out of specification. Regulation is halted if the output voltage is outside of a programmable range. A PGOOD pin provides an output signal to show that the output voltage is within range and the system is regulating.

The MAX20796 is offered in a 35-pin, 4 × 10.5mm FC2QFN package, ideal for use in networking and communication end equipment.

The device is also available as MAX20796A, which is preconfigured for a 1V, 800kHz application with LEAD_LAG enabled.

Simplified Block Diagram

MAX20796: Simplified Application Schematic MAX20796: Simplified Application Schematic 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.