1-Cell ModelGauge m5 EZ Fuel Gauge with Protector and SHA-256 Authentication

Description

Create a design and simulate using EE-Sim^® tools:

The MAX17301–MAX17303/MAX17311–MAX17313 is a 24μA I_Q stand-alone pack-side fuel gauge IC with protector and optional SHA-256 authentication for 1-cell lithium-ion/polymer batteries.

The IC monitors the voltage, current, temperature, and state of the battery to provide against over/undervoltage, overcurrent, short-circuit, over/undertemperature and overcharge conditions protection using external high-side N-FETs, and provides charging prescription to ensure that the lithium-ion/polymer battery operates under safe conditions prolonging the life of the battery.

To prevent battery pack cloning, the IC integrates SHA-256 authentication with a 160-bit secret key. Each IC incorporates a unique 64-bit ID.

The fuel gauge uses ModelGauge m5 algorithm that combines the short-term accuracy and linearity of a coulomb counter with the long-term stability of a voltage-based fuel gauge to provide industry-leading fuel-gauge accuracy.

The IC automatically compensates for cell aging, temperature, and discharge rate, and provides accurate state-of-charge (SOC) in milliampere-hours (mAh) or percentage (%) over a wide range of operating conditions.

Dynamic power functionality provides the instantaneous maximum battery output power which can be delivered to the system without violating the minimum system input voltage.

Key Features

• Battery Health + Programmable Safety/Protection
  • Overvoltage (Temperature Dependent)
  • Overcharge Current 
  • Over/Undertemperature
  • Ideal Diode Discharge During Charge Fault
  • Charging Prescriptions (JEITA)
  • Zero-Volt Charging Option
  • Undervoltage + SmartEmpty
  • Overdischarge/Short-Circuit 
• Nonvolatile Memory for Stand-Alone Operation
  • ​History Logging, User Data (122 Bytes)
• Low Quiescent Current
  • FETs Enabled: 24µA Active, 18µA Hibernate
  • FETs Disabled: 7µA Ship, 0.5µA DeepShip, 0.1µA UV-Shutdown
• Pushbutton Wakeup—Eliminates System Consumption Until Button Press
• ModelGauge m5 EZ Algorithm
  • Percent, Capacity,Time-to-Empty/Full, Age
  • Cycle+™ Age Forecast
• Dynamic Power—Estimates Power Capability
• Precision Measurement Without Calibration
  • ​Current, Voltage, Power, Time, Cycles
  • Die Temperature​/Thermistor

Applications/Uses

• Smartphones, Tablets, and 2-in-1 Laptops
• Smartwatches and Wearables
• Medical Devices, Health and Fitness Monitors
• Digital Still, Video, and Action Cameras
• Handheld Computers and Terminals
• Handheld Radios
• Home and Building Automation, Sensors
• Smart Batteries