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MAX77812

MAX77812

20A User-Configurable Quad-Phase Buck Converter

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

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Overview

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 ›

MAX77812: Simplified Block Diagram MAX77812: Simplified Block Diagram Enlarge+

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

See parametric specs for Step-Down Switching Regulators (404)


Part NumberVIN
(V)		VIN
(V)		VOUT1
(V)		VOUT1
(V)		IOUT1
(A)		Switch TypeSynchronous SwitchingOper. Freq.
(kHz)		FeaturesDesign ToolsPackage/PinsBudgetary
Price
minmaxminmaxmaxSee Notes
MAX77812 2.55.50.251.52520InternalYes2000
Adjustable Freq.
Current Limit
Dual/Multi-Phase
Fixed Freq./PWM
EE-Sim
WLP/64
$1.89 @1k

Pricing Notes:
This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific and version-specific prices and delivery, please see the price and availability page or contact an authorized distributor.

Design Resources


MAX77812EVKIT: Evaluation Kit for the MAX77812

Technical Documents

App Note 6903 Generating Greater System Efficiency for Single- to Multi-Cell Battery-Powered Designs
App Note 6826 How to Program Startup and Shutdown Sequence with MAX77812
App Note 6823 Generating a Higher Output Voltage than 1.525V Using the MAX77812
App Note 6822 How to use Multi-Function GPIs?
App Note 6821 Factory-Programmable Parameters of the MAX77812
App Note 6820 How Overcurrent Protection Works in the MAX77812
User Guide 6819 MAX77812 PCB Layout Guide
App Note 6804 Guidelines for the MAX77812 User-Selectable Phase Configurations and How to Select Them

Additional Resources

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

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


Tools & Models

  • EE-Sim: Design & Simulate MAX77812

    • Quality And Environmental

    Request Reliability Report for: MAX77812 
    Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C   Material Composition  

    Note : The failure rates are summarized by technology and mapped to the associated material part numbers. The failure rates are highly dependent on the number of units tested.

    Quality Management System >
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    Reference Designs