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2S-4S ModelGauge m5 EZ Fuel Gauge with Protector, Internal Self-Discharge Detection, and SHA-256 Authentication

Industry's Lowest IQ Stand-Alone Multi-Cell Fuel Gauge with Protector and SHA-256 Authentication

Product Details

The MAX17320 is a 38µA IQ stand-alone pack-side fuel gauge IC with protector, battery internal self-discharge detection, and optional SHA-256 authentication for 2 to 4 series lithium-ion/polymer batteries.

The IC monitors the voltage, current, temperature and state of the battery to provide protection against over/undervoltage, overcurrent, short-circuit, over/undertemperature, overcharge, and internal self-discharge conditions using external high-side N-FETs, and provides charging prescription to ensure that the battery operates under safe conditions, thereby prolonging the life of the battery. The IC balances the cells using internal FETs. During prequal charging, the IC uses the CHGFET to linearly control charging.

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 Maxim 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.

The IC provides a configurable always-on LDO that can power small critical loads on the system side without overloading the cells even under fault 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.

A Maxim 1-Wire® or 2-wire I2C/SMBus interface provides access to data and control registers. The IC is available in a lead-free, 2.4mm x 2.6mm 30-bump 0.4mm pitch WLP and 4mm x 4mm 24-pin TQFN packages.

Key Features

  • Battery Health + Programmable Safety/Protection
    • Overvoltage (Temperature Dependent)
    • Overcharge/Overdischarge/Short-Circuit Current
    • Over/Undertemperature
    • Undervoltage + SmartEmpty
    • Battery Internal Self-Discharge Detection
    • Ideal Diode Discharge During Charge Fault
    • Charging Prescriptions (JEITA)
    • Prequal Charge Control with CHG FET
  • ModelGauge m5 EZ Algorithm
    • Percent, Capacity, Time-to-Empty/Full, Age
    • Cycle+™ Age Forecast
  • Precision Measurement Without Calibration
    • Current, Voltage, Power, Time, Cycles
    • Die Temperature, 4 Thermistors ±1°C
  • Cell Balancing with Internal FETs
  • SHA-256 Authentication
  • Nonvolatile Memory for Stand-Alone Operation
    • History Logging, User Data (84 Bytes)
  • Low Quiescent Current
    • FETs Enabled: 38µA Active
  • Pushbutton Wakeup—Eliminates System Consumption Until Button Press
  • Always-On LDO
  • Dynamic Power—Estimates Power Capability
  • SBS 1.1 Compatible Register Set

Applications/Uses

  • Digital Still, Video, and Action Cameras
  • Handheld Computers, Radios, and Terminals
  • Medical Devices, Health and Fitness Monitors
  • Power Tools, Wireless Speakers, and Drones
  • Smart Batteries and Battery Backup
  • Smartphones, Tablets, and 2-in-1 Laptops
Parametric specs for Battery ID and Authentication
Functions Battery ID
Fuel Gauge
SHA-256 Authentication
Interface 1-Wire
2-Wire
User Data Storage (bits) 672 NVM
VSUPPLY (V) 4.2 to 18
Package/Pins TQFN-CU/24
WLP/30
Oper. Temp. (°C) -40 to +85
Budgetary
Price (See Notes)
$1.55 @1k
Parametric specs for Battery Fuel Gauges, Protectors, and Monitors
Functions Fuel Gauge
Protector
Battery Type 2-4 Cell Li-Ion
Fuel Gauge Algorithm ModelGauge m5
Interface 1-Wire
2-Wire
User Data Storage (Bytes) 84 NVM
Parameters Measured Current
State of Charge
Temperature
Time
Voltage
Applications Pack
Battery Protection Features 2-Level
Charger-Communication Timeout
Internal Self-Discharge
Over Voltage
Over-Charge
Over-Current
Over-Temperature
Over/Under Voltage
VSUPPLY (V) (min) 4.2
VSUPPLY (V) (max) 18
Package/Pins TQFN-CU/24
WLP/30
Oper. Temp. (°C) -40 to +85
Budgetary
Price (See Notes)
$1.55 @1k
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Simplified Block Diagram

MAX17320: Simplified Block Diagram MAX17320: Simplified Block Diagram Zoom icon

Technical Docs

Design & Development

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

Description

The MAX17320X/MAX17320G evaluation kits (EV kits) are fully assembled and tested surface-mount PCBs that evaluate the stand-alone pack-side fuel gauge IC with protector and optional SHA-256 authentication for 2-4 cell lithium-ion/polymer batteries.

The MAX17320 EV kits include the IC evaluation board with integrated I2C/1-Wire® interface and USB micro-B cable. Windows® based graphical user interface (GUI) software is available for use with the EV kit and can be downloaded from https:// www.maximintegrated.com/products/MAX17320.html/ product page under “Design Resources” tab. Windows 7 or newer Windows operating system is required to use with the EV kit GUI software.

View Details

Features

  • ModelGauge m5 Algorithm
  • Monitors Multicell Packs
  • Full Protection Solution On-Board for Evaluation
  • Battery Pack Input Voltage Range of +2.3V to +4.9V/Cell with Default Hardware
  • Default Current Range -10A to +10A with 5mΩ Sense Resistor, Higher Currents Can Be Supported by Changing to a Smaller Sense Resistor
  • Thermistor Measurement
  • On-Board I2C/1-Wire Communication Interface with Built-In MAXUSB Interface
  • Windows 7 or Newer Compatible Software
  • Proven PCB Layout
  • Fully Assembled and Tested

Description

The MAX17320X/MAX17320G evaluation kits (EV kits) are fully assembled and tested surface-mount PCBs that evaluate the stand-alone pack-side fuel gauge IC with protector and optional SHA-256 authentication for 2-4 cell lithium-ion/polymer batteries.

The MAX17320 EV kits include the IC evaluation board with integrated I2C/1-Wire® interface and USB micro-B cable. Windows® based graphical user interface (GUI) software is available for use with the EV kit and can be downloaded from https:// www.maximintegrated.com/products/MAX17320.html/ product page under “Design Resources” tab. Windows 7 or newer Windows operating system is required to use with the EV kit GUI software.

View Details

Features

  • ModelGauge m5 Algorithm
  • Monitors Multicell Packs
  • Full Protection Solution On-Board for Evaluation
  • Battery Pack Input Voltage Range of +2.3V to +4.9V/Cell with Default Hardware
  • Default Current Range -10A to +10A with 5mΩ Sense Resistor, Higher Currents Can Be Supported by Changing to a Smaller Sense Resistor
  • Thermistor Measurement
  • On-Board I2C/1-Wire Communication Interface with Built-In MAXUSB Interface
  • Windows 7 or Newer Compatible Software
  • Proven PCB Layout
  • Fully Assembled and Tested

Description

The MAX17320X/MAX17320G evaluation kits (EV kits) are fully assembled and tested surface-mount PCBs that evaluate the stand-alone pack-side fuel gauge IC with protector and optional SHA-256 authentication for 2-4 cell lithium-ion/polymer batteries.

The MAX17320 EV kits include the IC evaluation board with integrated I2C/1-Wire® interface and USB micro-B cable. Windows® based graphical user interface (GUI) software is available for use with the EV kit and can be downloaded from https:// www.maximintegrated.com/products/MAX17320.html/ product page under “Design Resources” tab. Windows 7 or newer Windows operating system is required to use with the EV kit GUI software.

View Details

Features

  • ModelGauge m5 Algorithm
  • Monitors Multicell Packs
  • Full Protection Solution On-Board for Evaluation
  • Battery Pack Input Voltage Range of +2.3V to +4.9V/Cell with Default Hardware
  • Default Current Range -10A to +10A with 5mΩ Sense Resistor, Higher Currents Can Be Supported by Changing to a Smaller Sense Resistor
  • Thermistor Measurement
  • On-Board I2C/1-Wire Communication Interface with Built-In MAXUSB Interface
  • Windows 7 or Newer Compatible Software
  • Proven PCB Layout
  • Fully Assembled and Tested

Description

The MAX17320X/MAX17320G evaluation kits (EV kits) are fully assembled and tested surface-mount PCBs that evaluate the stand-alone pack-side fuel gauge IC with protector and optional SHA-256 authentication for 2-4 cell lithium-ion/polymer batteries.

The MAX17320 EV kits include the IC evaluation board with integrated I2C/1-Wire® interface and USB micro-B cable. Windows® based graphical user interface (GUI) software is available for use with the EV kit and can be downloaded from https:// www.maximintegrated.com/products/MAX17320.html/ product page under “Design Resources” tab. Windows 7 or newer Windows operating system is required to use with the EV kit GUI software.

View Details

Features

  • ModelGauge m5 Algorithm
  • Monitors Multicell Packs
  • Full Protection Solution On-Board for Evaluation
  • Battery Pack Input Voltage Range of +2.3V to +4.9V/Cell with Default Hardware
  • Default Current Range -10A to +10A with 5mΩ Sense Resistor, Higher Currents Can Be Supported by Changing to a Smaller Sense Resistor
  • Thermistor Measurement
  • On-Board I2C/1-Wire Communication Interface with Built-In MAXUSB Interface
  • Windows 7 or Newer Compatible Software
  • Proven PCB Layout
  • Fully Assembled and Tested

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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

Parameters

Parametric specs for Battery ID and Authentication
Functions Battery ID
Fuel Gauge
SHA-256 Authentication
Interface 1-Wire
2-Wire
User Data Storage (bits) 672 NVM
VSUPPLY (V) 4.2 to 18
Package/Pins TQFN-CU/24
WLP/30
Oper. Temp. (°C) -40 to +85
Budgetary
Price (See Notes)
$1.55 @1k
Parametric specs for Battery Fuel Gauges, Protectors, and Monitors
Functions Fuel Gauge
Protector
Battery Type 2-4 Cell Li-Ion
Fuel Gauge Algorithm ModelGauge m5
Interface 1-Wire
2-Wire
User Data Storage (Bytes) 84 NVM
Parameters Measured Current
State of Charge
Temperature
Time
Voltage
Applications Pack
Battery Protection Features 2-Level
Charger-Communication Timeout
Internal Self-Discharge
Over Voltage
Over-Charge
Over-Current
Over-Temperature
Over/Under Voltage
VSUPPLY (V) (min) 4.2
VSUPPLY (V) (max) 18
Package/Pins TQFN-CU/24
WLP/30
Oper. Temp. (°C) -40 to +85
Budgetary
Price (See Notes)
$1.55 @1k

Key Features

  • Battery Health + Programmable Safety/Protection
    • Overvoltage (Temperature Dependent)
    • Overcharge/Overdischarge/Short-Circuit Current
    • Over/Undertemperature
    • Undervoltage + SmartEmpty
    • Battery Internal Self-Discharge Detection
    • Ideal Diode Discharge During Charge Fault
    • Charging Prescriptions (JEITA)
    • Prequal Charge Control with CHG FET
  • ModelGauge m5 EZ Algorithm
    • Percent, Capacity, Time-to-Empty/Full, Age
    • Cycle+™ Age Forecast
  • Precision Measurement Without Calibration
    • Current, Voltage, Power, Time, Cycles
    • Die Temperature, 4 Thermistors ±1°C
  • Cell Balancing with Internal FETs
  • SHA-256 Authentication
  • Nonvolatile Memory for Stand-Alone Operation
    • History Logging, User Data (84 Bytes)
  • Low Quiescent Current
    • FETs Enabled: 38µA Active
  • Pushbutton Wakeup—Eliminates System Consumption Until Button Press
  • Always-On LDO
  • Dynamic Power—Estimates Power Capability
  • SBS 1.1 Compatible Register Set

Applications/Uses

  • Digital Still, Video, and Action Cameras
  • Handheld Computers, Radios, and Terminals
  • Medical Devices, Health and Fitness Monitors
  • Power Tools, Wireless Speakers, and Drones
  • Smart Batteries and Battery Backup
  • Smartphones, Tablets, and 2-in-1 Laptops

Description

The MAX17320 is a 38µA IQ stand-alone pack-side fuel gauge IC with protector, battery internal self-discharge detection, and optional SHA-256 authentication for 2 to 4 series lithium-ion/polymer batteries.

The IC monitors the voltage, current, temperature and state of the battery to provide protection against over/undervoltage, overcurrent, short-circuit, over/undertemperature, overcharge, and internal self-discharge conditions using external high-side N-FETs, and provides charging prescription to ensure that the battery operates under safe conditions, thereby prolonging the life of the battery. The IC balances the cells using internal FETs. During prequal charging, the IC uses the CHGFET to linearly control charging.

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 Maxim 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.

The IC provides a configurable always-on LDO that can power small critical loads on the system side without overloading the cells even under fault 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.

A Maxim 1-Wire® or 2-wire I2C/SMBus interface provides access to data and control registers. The IC is available in a lead-free, 2.4mm x 2.6mm 30-bump 0.4mm pitch WLP and 4mm x 4mm 24-pin TQFN packages.

Simplified Block Diagram

MAX17320: Simplified Block Diagram MAX17320: Simplified Block 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