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

Description

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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 (I_Q)
• 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