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20A User-Configurable Quad-Phase Buck Converter

High-Efficiency 20A BUCK with User-Selectable Phase Configuration

Product Details

The MAX77812 is a quad-phase high-efficiency stepdown (buck) converter capable of delivering up to 20A of maximum current. Programmable startup/shutdown sequence and user-selectable phase configurations make the MAX77812 ideal for powering the latest generations of processors. With high-efficiency and small solution size, the MAX77812 is optimized for space constrained single-cell battery powered applications.

The MAX77812 uses an adaptive on-time PWM control scheme and it has SKIP and low-power SKIP modes for improved light-load efficiency. A programmable current limit reduces the overall solution footprint by optimizing inductors size. Differential sensing provides high output voltage accuracy, while enhanced transient response (ETR) allows fast output voltage adjustments to load transients. Programmable soft-start/stop and ramp-up/down slew rate provides control over an inrush current as the regulator transitions between operating states.

A 3.4MHz high-speed I2C or 30MHz SPI interface with dedicated logic inputs provide full configurability and control for system power optimization.

The MAX77812 is available in 3.408mm x 3.368mm, 64-bump 0.4mm pitch wafer-level package (WLP).

Design Solution: How to Power Your QSFP-DD Optical Transceiver ›

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Key Features

  • 20A Maximum Output Current (5A per Phase)
  • VIN Range: 2.5V to 5.5V
  • VOUT Range: 0.250V to 1.525V with 5mV Steps
  • ±0.5% Initial Output Accuracy with Differential Sensing
  • 5 User-Selectable Phase Configurations
  • 91% Peak Efficiency (VIN = 3.8V, VOUT = 1.1V)
  • Auto (SKIP/PWM) and Forced PWM Modes
  • Enhanced Load Transient Response
  • Programmable Ramp-Up/Down Slew Rates
  • Programmable Startup/Shutdown Sequence
  • UVLO, Short-Circuit, and Thermal Protections
  • 2 User-Programmable General-Purpose Inputs
  • 3.4MHz High Speed I2C and 30MHz SPI Interface
  • 3.408mm x 3.368mm, 64-Bump WLP Package

Applications/Uses

  • AR/VR Headsets and Game Consoles
  • CPU/GPU, FPGAs, and DSPs Power Supply
  • Li-ion Battery Powered Equipment
  • Space Constrained Portable Electronics
Parametric specs for Step-Down Switching Regulators
VIN (V) (min) 2.5
VIN (V) (max) 5.5
VOUT1 (V) (min) 0.25
VOUT1 (V) (max) 1.525
IOUT1 (A) (max) 20
Switch Type Internal
Preset VOUT (V) 0.85
Output Adjust. Method Digital/VID
Preset
Synchronous Switching? Yes
# DC-DC Outputs 4
Switching Frequency (kHz) 2000
Design Tools EE-Sim
Package/Pins WLP/64
Budgetary
Price (See Notes)
$1.89 @1k
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Simplified Block Diagram

MAX77812: Simplified Block Diagram MAX77812: Simplified Block Diagram Zoom icon

Design & Development

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Description

The MAX77812 evaluation kit (EV kit) is a fully assembled and tested printed circuit board (PCB) that demonstrates the MAX77812. The EV kit allows for easy evaluation of each feature. It supports user-programmable phase configuration to one of five options:

  • Single output in 4 phase configuration (default)
  • Dual outputs in 3 + 1 phase configuration
  • Dual outputs in 2 + 2 phase configuration
  • Three outputs in 2 + 1 + 1 phase configuration
  • Four outputs in 1 + 1 + 1 + 1 phase configuration

A Micro-B USB cable is included in the package to serve as the USB to I2C interface for easy testing. Windows®- based software provides a user-friendly interface to exercise the features of the MAX77812. This software offers a graphical user interface (GUI) as well as a register-based interface.

View Details

Features

  • 20A Maximum Output Current (5A per phase)
  • VIN Range: 2.5V to 5.5V
  • VOUT Range: 0.250V to 1.525V with 5mV Steps
  • ±0.5% Initial Output Accuracy with Differential Sensing
  • 5 User-selectable Phase Configurations
  • 91% Peak Efficiency (VIN = 3.8V, VOUT = 1.1V)
  • Auto (SKIP/PWM) and Forced PWM Modes
  • Enhanced Load Transient Response
  • Programmable Ramp-up/down Slew Rates
  • Programmable Startup/Shutdown Sequence
  • UVLO, Short-Circuit, and Thermal Protections
  • 2 User-programmable General-Purpose Inputs
  • 3.4MHz High Speed I2C and 30MHz SPI Interface
  • 3.408mm x 3.368mm 64-Bumps WLP Package

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    Tools & Models

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    Parameters

    Parametric specs for Step-Down Switching Regulators
    VIN (V) (min) 2.5
    VIN (V) (max) 5.5
    VOUT1 (V) (min) 0.25
    VOUT1 (V) (max) 1.525
    IOUT1 (A) (max) 20
    Switch Type Internal
    Preset VOUT (V) 0.85
    Output Adjust. Method Digital/VID
    Preset
    Synchronous Switching? Yes
    # DC-DC Outputs 4
    Switching Frequency (kHz) 2000
    Design Tools EE-Sim
    Package/Pins WLP/64
    Budgetary
    Price (See Notes)
    $1.89 @1k

    Key Features

    • 20A Maximum Output Current (5A per Phase)
    • VIN Range: 2.5V to 5.5V
    • VOUT Range: 0.250V to 1.525V with 5mV Steps
    • ±0.5% Initial Output Accuracy with Differential Sensing
    • 5 User-Selectable Phase Configurations
    • 91% Peak Efficiency (VIN = 3.8V, VOUT = 1.1V)
    • Auto (SKIP/PWM) and Forced PWM Modes
    • Enhanced Load Transient Response
    • Programmable Ramp-Up/Down Slew Rates
    • Programmable Startup/Shutdown Sequence
    • UVLO, Short-Circuit, and Thermal Protections
    • 2 User-Programmable General-Purpose Inputs
    • 3.4MHz High Speed I2C and 30MHz SPI Interface
    • 3.408mm x 3.368mm, 64-Bump WLP Package

    Applications/Uses

    • AR/VR Headsets and Game Consoles
    • CPU/GPU, FPGAs, and DSPs Power Supply
    • Li-ion Battery Powered Equipment
    • Space Constrained Portable Electronics

    Description

    The MAX77812 is a quad-phase high-efficiency stepdown (buck) converter capable of delivering up to 20A of maximum current. Programmable startup/shutdown sequence and user-selectable phase configurations make the MAX77812 ideal for powering the latest generations of processors. With high-efficiency and small solution size, the MAX77812 is optimized for space constrained single-cell battery powered applications.

    The MAX77812 uses an adaptive on-time PWM control scheme and it has SKIP and low-power SKIP modes for improved light-load efficiency. A programmable current limit reduces the overall solution footprint by optimizing inductors size. Differential sensing provides high output voltage accuracy, while enhanced transient response (ETR) allows fast output voltage adjustments to load transients. Programmable soft-start/stop and ramp-up/down slew rate provides control over an inrush current as the regulator transitions between operating states.

    A 3.4MHz high-speed I2C or 30MHz SPI interface with dedicated logic inputs provide full configurability and control for system power optimization.

    The MAX77812 is available in 3.408mm x 3.368mm, 64-bump 0.4mm pitch wafer-level package (WLP).

    Design Solution: How to Power Your QSFP-DD Optical Transceiver ›

    Design Solution: How to Make Your Portable Game Console Play Longer ›

    Simplified Block Diagram

    MAX77812: Simplified Block Diagram MAX77812: Simplified Block Diagram Zoom icon

    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