EVALUATION KIT AVAILABLE Click here for production status of specific part numbers. MAX77818 Dual Input, Power Path, 3A Switch Mode Charger with Fuel Gauge General Description Benefits and Features The MAX77818 integrates a high-performance 3A switching Smart Power Path, Dual Input Switching Charger charger and proprietary ModelGauge m5 fuel gauge Up to 13.4V Operating/16V Withstand/4A (CHGIN) in a space saving WLP package, ideal for USB powered Up to 6V Operating/1.26A (WCIN) portable devices. The smart power path charger sup- Reverse Leakage Blocking ports two inputs with reverse blocking and USB On-the- Reverse Boost with up to 5.1V/1.5A (OTG) Go (OTG), integrates all power switches, operates at Integrated Low-Loss FETs for 3A Charging/4.5A high-switching frequency with high efficiency, enabling Discharging low heat designs with small external components. The 95.6% Peak Efficiency at 5V/4.35V ModelGauge m5 algorithm combines the excellent short- Full Feature Charger with Protection term accuracy and linearity of a coulomb counter with Thermal Regulation and JEITA Compliance the long-term stability of a voltage-based fuel gauge, ModelGauge m5 Fuel Gauge along with temperature compensation to provide industry- Time-to-Empty and Time-to-Full Prediction leading fuel-gauge accuracy. The device also integrates Accurate Battery Capacity (SOC) and two high voltage input LDOs and is highly programmable Time-to-Empty Readings 2 with I C interface. - Temperature, Age, and Discharge Rate Compensated Applications - No Calibration Industrial PCs - Integrated FET Current Sensing Portable Medical Devices - Maintains Accuracy without Empty, Full, Wearable, Smart Watches or Idle States Handheld Devices Low Quiescent Current (IQ) Wireless Speakers Two High Voltage Input LDOs Bluetooth Headsets 2 I C Serial Interface Smart Home Automation, Sensors Internet of Things (IoT) 72-Bump, 3.867mm x 3.608mm, 0.4mm Pitch WLP Ordering Information appears at end of data sheet. Typical Operating Circuit CHGIN VBUS BYP WCIN BST CHGLX PVL AVL CHARGER CONTROL V VIO SYS REVERSE BOOST GND CHGPG V IO SYS DETBAT 2 I C THM FET SDA INTERFACE CURRENT BATT PK+ SCL SENSING AND BAT SP INTERRUPT BAT SN MODELGAUGE SAFEOUT1 M5 ADC PK- THM SAFEOUT2 THMB MAX77818 V BFG ModelGauge is a trademark of Maxim Integrated Products, Inc. 19-6902 Rev 4 3/20 USB CONNECTORMAX77818 Dual Input, Power Path, 3A Switch Mode Charger with Fuel Gauge TABLE OF CONTENTS General Description ............................................................................ 1 Applications .................................................................................. 1 Benefits and Features .......................................................................... 1 Typical Operating Circuit ........................................................................ 1 Absolute Maximum Ratings ...................................................................... 9 Package Thermal Characteristics ................................................................. 9 Electrical Characteristics ........................................................................ 9 General Electrical Characteristics . 9 Switching Charger Electrical Characteristics........................................................ 10 Safeout LDOs Electrical Characteristics ........................................................... 18 Safeout LDOs Electrical Characteristics (continued).................................................. 19 Fuel Gauge Electrical Characteristics ............................................................. 19 Fuel Gauge Electrical Characteristics (continued).................................................... 20 2 I C Electrical Characteristics.................................................................... 21 Pin Configuration ............................................................................. 23 Pin Description ............................................................................... 24 Functional Block Diagram ...................................................................... 26 Detailed Description........................................................................... 27 Switching Charger . 27 ModelGauge m5 Fuel Gauge 27 Charger Details . 28 Smart Power Selector (SPS) 28 Control Bits . 28 Energy Distribution Priority: . 28 BYP Regulation Voltage 30 SYS Regulation Voltage 30 Battery Detect Input Pin (DETBATB) 30 Input Validation 30 Input Current Limit 30 Input-Voltage Regulation (V ) 32 CHGIN REG Input Self-Discharge for Reliable Charger Input Interrupt . 32 System Self-Discharge with No Power 32 Charge States . 32 No Input Power or Charger Disabled State . 36 Dead Battery Prequalificiation State 36 Fast-Charge Constant Current State 36 Fast-Charge Constant Voltage State 36 Maxim Integrated 2 www.maximintegrated.com