Battery Fuel Gauge IC Lithium Ion/Polymer 24-TQFN (4x4)
The MAX17320G20+ is a high-accuracy, ultra-low-power fuel gauge and battery protector IC designed for 2-cell to 4-cell lithium-ion and lithium-polymer battery packs. The device integrates Maxim Integrated’s ModelGauge™ m5 EZ algorithm to provide precise battery state-of-charge estimation without requiring battery relearning after system resets or battery replacement. It is optimized for portable, wearable, industrial, and IoT battery-powered applications where accurate battery monitoring and robust protection are required.
The device combines fuel gauging, battery authentication support, autonomous battery protection, current sensing, and voltage monitoring into a single integrated solution. It includes configurable protection features such as overvoltage, undervoltage, overcurrent, short-circuit, and thermal protection, helping improve system safety and battery reliability. The MAX17320G20+ communicates through an I²C-compatible interface and supports low-power operation for extended battery runtime.
Features
High-accuracy battery fuel gauge for multi-cell lithium-ion batteries
Supports 2-cell to 4-cell battery pack configurations
Integrated ModelGauge m5 EZ algorithm with no battery relearning required
Integrated battery protector with autonomous safety monitoring
Supports overvoltage, undervoltage, overcurrent, short-circuit, and thermal protection
Integrated current-sense amplifier for accurate current measurement
Low quiescent current optimized for portable and always-on systems
I²C-compatible communication interface
Configurable alert and interrupt functions
Battery aging compensation and cycle tracking
Supports battery authentication functionality
Integrated ADCs for voltage, current, and temperature monitoring
Programmable protection thresholds and timing parameters
Low-power hibernate and sleep operating modes
Electrical Characteristics
Designed for lithium-ion and lithium-polymer battery chemistries
Supports battery stack voltages corresponding to 2S to 4S configurations
High-resolution voltage, current, temperature, and capacity measurements
Low operating current suitable for battery-powered systems
Integrated precision coulomb counter
Wide operating temperature range suitable for industrial applications
Protection Functions
Cell overvoltage protection
Cell undervoltage protection
Charge overcurrent protection
Discharge overcurrent protection
Short-circuit protection
Overtemperature and undertemperature protection
Permanent failure detection and fault logging
Autonomous FET control for pack isolation
Interface and Control
I²C serial communication interface
Programmable registers for protection and fuel gauge configuration
Interrupt and alert outputs for fault and status indication
Supports host processor communication and diagnostics
Nonvolatile memory for configuration storage
Package Information
Package type is TQFN
Compact surface-mount package suitable for space-constrained designs
RoHS compliant and lead-free package option
Typical Applications
Smart battery packs
Portable medical devices
Industrial handheld equipment
IoT and wireless sensor devices
Battery-powered consumer electronics
Portable test and measurement systems
Rechargeable multi-cell battery systems
