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Dual Input, Power Path, 3A Switching Mode Charger with Fuel Gauge

Industry's Highest Efficiency Switching Mode Charger in a Smaller Solution Size in 3.87mm x 3.61mm WLP

Product Details

The MAX77818 integrates a high-performance 3A switching charger and proprietary ModelGauge™ m5 fuel gauge in a space saving WLP package, ideal for USB powered portable devices. The smart power path charger supports two inputs with reverse blocking and USB On-the-Go (OTG), integrates all power switches, operates at high-switching frequency with high efficiency, enabling low heat designs with small external components. The ModelGauge m5 algorithm combines the excellent short-term accuracy and linearity of a coulomb counter with the long-term stability of a voltage-based fuel gauge, along with temperature compensation to provide industry-leading fuel-gauge accuracy. The device also integrates two high voltage input LDOs and is highly programmable with I2C interface.

Key Features

  • Smart Power Path, Dual Input Switching Charger
    • Up to 13.4V Operating/16V Withstand/4A (CHGIN)
    • Up to 6V Operating/1.26A (WCIN)
    • Reverse Leakage Blocking
    • Reverse Boost with up to 5.1V/1.5A (OTG)
    • Integrated Low-Loss FETs for 3A Charging/4.5A Discharging
    • 95.6% Peak Efficiency at 5V/4.35V
    • Full Feature Charger with Protection
    • Thermal Regulation and JEITA Compliance
  • ModelGauge m5 Fuel Gauge
    • Time-to-Empty and Time-to-Full Prediction
    • Accurate Battery Capacity (SOC) and Time-to-Empty Readings
      • Temperature, Age, and Discharge Rate Compensated
      • No Calibration
      • Integrated FET Current Sensing
      • Maintains Accuracy without Empty, Full, or Idle States
    • Low Quiescent Current (IQ)
  • Two High Voltage Input LDOs
  • I2C Serial Interface
  • 72-Bump, 3.867mm x 3.608mm, 0.4mm Pitch WLP

Applications/Uses

  • Bluetooth Headsets
  • Handheld Devices
  • Industrial PCs
  • Internet of Things (IoT)
  • Portable Medical Devices
  • Smart Home Automation, Sensors
  • Wearable, Smart Watches
  • Wireless Speakers
Parametric specs for Battery Chargers
Charging VIN (V) (max) 14
Max. ICHG (A) 3
Cell Chemistry Li-Ion
Li-Polymer
# Lithium Ion Cells 1
Protected VIN (V) (max) 16
Charger (V) 3.65 to 4.7
Oper. Temp. (°C) -40 to +85
Package/Pins WLP/72
Budgetary
Price (See Notes)
$2.05 @1k
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Simplified Block Diagram

MAX77818: Simplified Functional Diagram MAX77818: Simplified Functional Diagram Zoom icon

Technical Docs

Design & Development

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

Description

The MAX77818 evaluation system (EV system) consists of a MAX77818 evaluation kit (EV kit) and a companion Maxim MINIQUSB interface board.

The MAX77818 EV kit is an assembled and tested PC board that demonstrates the MAX77818. The IC contains 12V input and 3A output switching mode charger.

The Maxim MINIQUSB interface board allows an IBM- compatible PC to use its USB port to emulate an I2C 2-wire interface. Windows XP®/Windows® 7 software provides a user-friendly interface to exercise the features of the MAX77818. The menu-driven program offers a graphical user interface with control buttons.

View Details

Features

  • Demonstrates 12VCHGIN, 3A Charge
  • Demonstrates m5 Fuel Gauge Performance
  • Demonstrates Dual Input Charge
  • Demonstrates OTG Mode
  • Evaluates MAX77818 Detail Performances

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Support & Training

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Parameters

Parametric specs for Battery Chargers
Charging VIN (V) (max) 14
Max. ICHG (A) 3
Cell Chemistry Li-Ion
Li-Polymer
# Lithium Ion Cells 1
Protected VIN (V) (max) 16
Charger (V) 3.65 to 4.7
Oper. Temp. (°C) -40 to +85
Package/Pins WLP/72
Budgetary
Price (See Notes)
$2.05 @1k

Key Features

  • Smart Power Path, Dual Input Switching Charger
    • Up to 13.4V Operating/16V Withstand/4A (CHGIN)
    • Up to 6V Operating/1.26A (WCIN)
    • Reverse Leakage Blocking
    • Reverse Boost with up to 5.1V/1.5A (OTG)
    • Integrated Low-Loss FETs for 3A Charging/4.5A Discharging
    • 95.6% Peak Efficiency at 5V/4.35V
    • Full Feature Charger with Protection
    • Thermal Regulation and JEITA Compliance
  • ModelGauge m5 Fuel Gauge
    • Time-to-Empty and Time-to-Full Prediction
    • Accurate Battery Capacity (SOC) and Time-to-Empty Readings
      • Temperature, Age, and Discharge Rate Compensated
      • No Calibration
      • Integrated FET Current Sensing
      • Maintains Accuracy without Empty, Full, or Idle States
    • Low Quiescent Current (IQ)
  • Two High Voltage Input LDOs
  • I2C Serial Interface
  • 72-Bump, 3.867mm x 3.608mm, 0.4mm Pitch WLP

Applications/Uses

  • Bluetooth Headsets
  • Handheld Devices
  • Industrial PCs
  • Internet of Things (IoT)
  • Portable Medical Devices
  • Smart Home Automation, Sensors
  • Wearable, Smart Watches
  • Wireless Speakers

Description

The MAX77818 integrates a high-performance 3A switching charger and proprietary ModelGauge™ m5 fuel gauge in a space saving WLP package, ideal for USB powered portable devices. The smart power path charger supports two inputs with reverse blocking and USB On-the-Go (OTG), integrates all power switches, operates at high-switching frequency with high efficiency, enabling low heat designs with small external components. The ModelGauge m5 algorithm combines the excellent short-term accuracy and linearity of a coulomb counter with the long-term stability of a voltage-based fuel gauge, along with temperature compensation to provide industry-leading fuel-gauge accuracy. The device also integrates two high voltage input LDOs and is highly programmable with I2C interface.

Simplified Block Diagram

MAX77818: Simplified Functional Diagram MAX77818: Simplified Functional Diagram 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