N EVALUATION KIT AVAILABLE Click here to ask about the production status of specific part numbers. MAX17320 2S-4S ModelGauge m5 EZ Fuel Gauge with Protector, Internal Self-Discharge Detection, and SHA-256 Authentication General Description Benefits and Features The MAX17320 is a 38A I stand-alone pack-side fuel Battery Health + Programmable Safety/Protection Q gauge IC with protector, battery internal self-discharge de- Overvoltage (Temperature Dependent) tection, and optional SHA-256 authentication for 2 to 4 se- Overcharge/Overdischarge/Short-Circuit Current ries lithium-ion/polymer batteries. Over/Undertemperature Undervoltage + SmartEmpty The IC monitors the voltage, current, temperature and Battery Internal Self-Discharge Detection state of the battery to provide protection against over/un- Ideal Diode Discharge During Charge Fault dervoltage, overcurrent, short-circuit, over/undertempera- Charging Prescriptions (JEITA) ture, overcharge, and internal self-discharge conditions Prequal Charge Control with CHG FET using external high-side N-FETs, and provides charging prescription to ensure that the battery operates under safe ModelGauge m5 EZ Algorithm conditions, thereby prolonging the life of the battery. The Percent, Capacity, Time-to-Empty/Full, Age IC balances the cells using internal FETs. During prequal Cycle+ Age Forecast charging, the IC uses the CHGFET to linearly control Precision Measurement Without Calibration charging. Current, Voltage, Power, Time, Cycles To prevent battery pack cloning, the IC integrates Die Temperature, 4 Thermistors 1C SHA-256 authentication with a 160-bit secret key. Each IC Cell Balancing with Internal FETs incorporates a unique 64-bit ID. SHA-256 Authentication TM The fuel gauge uses Maxim ModelGauge m5 algorithm Nonvolatile Memory for Stand-Alone Operation that combines the short-term accuracy and linearity of a History Logging, User Data (84 Bytes) coulomb counter with the long-term stability of a voltage- Low Quiescent Current based fuel gauge to provide industry-leading fuel gauge FETs Enabled: 38A Active accuracy. The IC automatically compensates for cell ag- Pushbutton WakeupEliminates System ing, temperature, and discharge rate, and provides accu- Consumption Until Button Press rate state-of-charge (SOC) in milliampere-hours (mAh) or Always-On LDO percentage (%) over a wide range of operating conditions. Dynamic PowerEstimates Power Capability The IC provides a configurable always-on LDO that can SBS 1.1 Compatible Register Set power small critical loads on the system side without over- loading the cells even under fault conditions. Dynamic Ordering Information appears at end of data sheet. power functionality provides the instantaneous maximum battery output power which can be delivered to the system Simplified Block Diagram without violating the minimum system input voltage. 3 TERM FUSE* PACK+ 2 A Maxim 1-Wire or 2-wire I C/SMBus interface provides N access to data and control registers. The IC is available in PFAIL* CHG DIS CP ZVC a lead-free, 2.4mm x 2.6mm 30-bump 0.4mm pitch WLP PCKP IN and 4mm x 4mm 24-pin TQFN packages. AOLDO* REG3 BATTS REG2 CELL3* ALRT* Applications SDA/DQ CELL2* SCL/OD Smartphones, Tablets, and 2-in-1 Laptops TH4* TH3* CELL1 TH2* Medical Devices, Health and Fitness Monitors MAX17320 TH1* GND CSP CSN Digital Still, Video, and Action Cameras Handheld Computers, Radios, and Terminals PACK- *OPTIONAL Power Tools, Wireless Speakers, and Drones Smart Batteries and Battery Backup ModelGauge is a trademark of Maxim Integrated Products, Inc. 1-Wire is a registered trademark of Maxim Integrated Products, Inc. Cycle+ is a trademark of Maxim Integrated Products, Inc. 19-100749 Rev 7 8/20 SECONDARY PROTECTOR* NMAX17320 2S-4S ModelGauge m5 EZ Fuel Gauge with Protector, Internal Self-Discharge Detection, and SHA-256 Authentication TABLE OF CONTENTS General Description 1 Applications 1 Benefits and Features 1 Simplified Block Diagram . 1 Absolute Maximum Ratings . 18 Package Information 19 30 WLP 19 24 TQFN . 20 Electrical Characteristics 21 Typical Operating Characteristics . 26 Pin Configurations 30 WLP 30 TQFN . 31 Pin Description 31 Functional Diagrams 33 Block Diagram 33 Detailed Description 34 General Description 34 Protector . 35 Protector Thresholds . 41 Voltage Thresholds . 42 SmartEmpty . 43 Current Thresholds 44 Overcurrent Protection 45 Fast Overcurrent Comparators 46 Overcurrent Comparator Diagram . 46 Slow Overcurrent Protection . 46 Temperature Thresholds . 46 Additional Protection Thresholds . 47 Battery Internal Self-Discharge Detection (ISD) 47 Charger Presence and Ideal Diode Behavior 49 Permanent Failure 50 Charge Control . 50 Zero-Volt Charging . 50 Prequal Charging 51 Charging Prescription . 51 Step Charging 52 2 Disabling FETs by Pin-Control or I C Command . 53 www.maximintegrated.com Maxim Integrated 2