MAX77812

PRODUCTION

20A User-Configurable Quad-Phase Buck Converter

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

Data Sheet (Rev. 12) Product Selection Table
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Overview

  • 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

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).

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Applications

  • AR/VR Headsets and Game Consoles
  • CPU/GPU, FPGAs, and DSPs Power Supply
  • Li-ion Battery Powered Equipment
  • Space Constrained Portable Electronics
MAX77812
20A User-Configurable Quad-Phase Buck Converter
MAX77812: Simplified Block Diagram
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Documentation

Data Sheet 1

Reliability Data 1

User Guide 1

Design Note 8

Technical Articles 2

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Software Resources

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Tools & Simulations

Software Development 1

EE-Sim Power® Tools 1

The EE-Sim DC-DC Converter Tool uses your requirements to quickly create a complete power design including a schematic, BOM with commercially available parts, and time and frequency domain simulations. Your customized schematic can be downloaded for further analysis in the standalone EE-Sim OASIS Simulator, featuring SIMPLIS and SIMetrix SPICE engines.

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SIMPLIS Models 1

Evaluation Kits

eval board
schematic 1
MAX77812EVKIT

Evaluation Kit for the MAX77812

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Features and Benefits

  • 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

Product Details

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 can be connected between the EV kit and a PC for easy testing of the I2C interface. 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.
MAX77812EVKIT
Evaluation Kit for the MAX77812
MAX77812EVKIT: Board Photo

Reference Designs

MAXREFDES1238
MAXREFDES1238
MAXREFDES1238 Circuits from the lab

Scalable, Single Input, 6 Output, Power Solution for the Versal ACAP Platform

View Detailed Reference Design

Features and Benefits

There are 16 ICs used in total:

  • 1 Multiphase Controller IC
  • 8 Multiphase Powerstage ICs (configurable from 1–8+ phases for an optimized solution)
  • 2 9A POL switching regulator ICs
  • 1 MAX77812 PMIC
  • 1 MAXM17574 module IC
  • 1 MAX15103 LDO IC
  • 1 MAX15101 LDO IC
  • 1 MAX40010 CSA IC

Other features include the following:

  • Single 12V supply
  • X% Efficiency
  • Optimized layout for Versal ACAP IC
  • Small solution size
  • Highly scalable
MAXREFDES1238
Scalable, Single Input, 6 Output, Power Solution for the Versal ACAP Platform
MAXREFDES1238

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