Analog Devices Inc./Maxim Integrated MAX17320X20+T

Overview

MAX17320X20+T from Analog Devices is a stand-alone 2S–4S lithium-ion/polymer battery fuel gauge IC with integrated protector, internal self-discharge detection, SHA-256 authentication, and ModelGauge m5 EZ algorithm. It delivers ±1% state-of-charge accuracy over full temperature and load range, monitors voltage/current/temperature across up to four cells, and controls external high-side N-FETs for overvoltage, overcurrent, short-circuit, and thermal protection in smart battery packs.

For engineers reviewing the MAX17320X20+T datasheet, MAX17320X20+T pinout, MAX17320X20+T application, or MAX17320X20+T equivalent, key selection considerations include its 38μA quiescent current in active mode, internal FET cell balancing, JEITA-compliant charging prescription, pushbutton wakeup capability, and dual-interface support (1-Wire® or I²C/SMBus) for embedded battery management systems.

Technical Context

The MAX17320X20+T implements a hybrid fuel-gauging architecture combining coulomb counting with voltage-based OCV estimation via the ModelGauge m5 EZ algorithm, enabling accurate SOC reporting without periodic calibration. Its protector block uses configurable thresholds for overvoltage (temperature-dependent), over/undertemperature, SmartEmpty™ undervoltage, and fast/slow overcurrent detection with dedicated comparators.

Cell balancing is executed using internal FETs during charge cycles within a defined voltage window (±15mV per cell), while dynamic power estimation calculates instantaneous maximum deliverable power without violating system input voltage limits. Authentication leverages hardware-accelerated SHA-256 with a unique 64-bit ID and programmable 160-bit secret key to prevent pack cloning.

Key Specifications

Pinout & Package

The MAX17320X20+T is packaged in a lead-free, 2.4mm × 2.6mm, 30-bump, 0.4mm pitch Wafer-Level Package (WLP), optimized for space-constrained battery pack PCB layouts.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar fuel gauge with protection applications.

Compared with BQ34Z100-G1 and MAX17205, the MAX17320X20+T uniquely integrates protector, internal self-discharge detection, and hardware SHA-256 in a single WLP package - delivering certified safety, extended shelf life, and supply-chain security without increasing board area or host processing overhead.

Availability

MAX17320X20+T is available at Aetrix Electronics and suitable for smartphones, medical wearables, and power tools requiring stable component supply, long-term lifecycle support, and guaranteed authentic battery management ICs.

Supply support for MAX17320X20+T includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Analog Devices, Inc. (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing technologies, serving industrial, automotive, communications, and consumer markets.

The MAX17320X20+T belongs to ADI's ModelGauge™ m5 fuel gauge product line, designed specifically for secure, calibration-free battery management in compact, safety-critical portable electronics.

FAQ

What is the primary function of the MAX17320X20+T in a battery pack?

The MAX17320X20+T serves as a stand-alone fuel gauge and protector IC for 2S–4S lithium-ion/polymer battery packs. It provides highly accurate state-of-charge estimation using the ModelGauge m5 EZ algorithm, monitors cell voltages and temperatures, controls external high-side FETs for safety protection, performs internal FET cell balancing, and executes SHA-256 authentication to prevent cloning. The MAX17320X20+T operates autonomously without host MCU intervention for core fuel-gauging and protection functions.

Does the MAX17320X20+T require calibration during manufacturing or field use?

No, the MAX17320X20+T does not require factory calibration or periodic field recalibration. Its ModelGauge m5 EZ algorithm combines coulomb counting with voltage-based OCV modeling to maintain ±1% state-of-charge accuracy across temperature, aging, and discharge rate variations. The MAX17320X20+T automatically compensates for cell aging and temperature effects using on-chip measurements and stored characterization data, eliminating calibration steps in production and end-user deployment.

How does the MAX17320X20+T implement battery authentication?

The MAX17320X20+T integrates a hardware-accelerated SHA-256 engine with a unique 64-bit factory-programmed ID and supports user-programmable 160-bit secret keys stored in protected nonvolatile memory. Authentication occurs during I²C or 1-Wire® transactions, verifying the battery pack's authenticity before enabling critical functions like charging or telemetry access. This prevents unauthorized or counterfeit battery modules from operating with host systems - a key requirement for MAX17320X20+T deployments in premium consumer and medical devices.

What protection features does the MAX17320X20+T provide, and how are they enforced?

The MAX17320X20+T provides overvoltage, overcharge, over/undertemperature, short-circuit, SmartEmpty™ undervoltage, and internal self-discharge detection. Protection is enforced through configurable thresholds stored in nonvolatile registers and executed by dedicated analog comparators with fast response times (<100μs for overcurrent). The IC drives external high-side N-FETs via CHG and DIS pins to disconnect charge or discharge paths, and asserts the ALRT* pin to signal faults to the host system. All protection logic operates independently of the fuel gauge algorithm, ensuring fail-safe behavior even during communication loss.

Can the MAX17320X20+T support both I²C and 1-Wire® interfaces simultaneously?

No, the MAX17320X20+T supports either I²C/SMBus or 1-Wire® communication - not both simultaneously. Interface selection is determined at power-up by the state of the SCL/OD and SDA/DQ pins: a pull-up on SCL/OD configures I²C mode, while a pull-down configures 1-Wire® mode. Once selected, the interface remains fixed until reset. This dual-mode flexibility allows the MAX17320X20+T to integrate seamlessly into existing designs using either protocol without requiring additional level-shifting or multiplexing circuitry.