Analog Devices Inc./Maxim Integrated MAX17303X+T

Overview

The MAX17303X+T from Analog Devices is a stand-alone 1-cell Li-ion/polymer fuel gauge IC with integrated protector, SHA-256 authentication, and ModelGauge m5 algorithm. It delivers 24µA quiescent current in active mode, monitors voltage/current/temperature, enforces JEITA-compliant charging prescriptions, and provides accurate state-of-charge (SOC) in % or mAh across wide operating conditions.

For engineers reviewing the MAX17303X+T datasheet, MAX17303X+T pinout, MAX17303X+T application, or MAX17303X+T equivalent, this device is selected for battery pack-level safety, cloning resistance, and high-accuracy fuel gauging in space-constrained portable electronics where low-power operation and autonomous protection are critical.

Technical Context

The MAX17303X+T implements a dual-sensing architecture: coulomb counting for short-term SOC linearity and voltage-based OCV estimation for long-term stability, fused via ModelGauge m5. Protection logic uses external high-side N-FETs to enforce overvoltage, overcurrent, short-circuit, over/undertemperature, and overcharge thresholds with configurable delay timers.

It supports both 1-Wire and 2-wire I²C interfaces for host communication, includes nonvolatile memory for history logging (122 bytes user data), and features pushbutton wakeup to eliminate system standby current until user interaction - enabling ultra-low-power ship modes down to 0.02µA DeepShip.

Key Specifications

Pinout & Package

MAX17303X+T is housed in a lead-free, 3mm × 3mm, 14-pin TDFN-EP package with exposed pad for thermal dissipation. Pin numbering follows standard TDFN convention (pin 1 marked).

Key Features

Applications

Equivalent & Alternatives

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

Compared with BQ34Z100-G1 and MAX17205, the MAX17303X+T uniquely integrates cryptographic authentication, JEITA-compliant charging control, and ModelGauge m5's ±1% accuracy - making it optimal for premium single-cell consumer and medical battery packs demanding security and longevity.

Availability

MAX17303X+T is available at Aetrix Electronics and suitable for smartphones, smartwatches, and medical health monitors requiring stable component supply, long-term lifecycle support, and guaranteed authentic sourcing.

Supply support for MAX17303X+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 is a global leader in high-performance analog, mixed-signal, and digital signal processing technologies, serving industrial, automotive, communications, and healthcare markets.

The MAX17303X+T belongs to the ModelGauge™ m5 fuel gauge product line, designed specifically for secure, high-accuracy, low-power battery management in single-cell Li-ion applications where safety, authenticity, and runtime predictability are critical.

FAQ

What is the primary function of the MAX17303X+T in a battery pack?

The MAX17303X+T serves as a stand-alone fuel gauge and protector IC for 1-cell Li-ion/polymer batteries. It precisely measures state-of-charge (SOC), enforces safety protections (overvoltage, overcurrent, temperature faults), executes JEITA-compliant charging, and provides SHA-256 authentication - all without host MCU intervention. Its ModelGauge m5 algorithm ensures ±1% SOC accuracy across aging and temperature variations, making MAX17303X+T essential for reliable runtime estimation in portable electronics.

Does the MAX17303X+T support both I²C and 1-Wire interfaces simultaneously?

Yes, the MAX17303X+T supports both I²C and 1-Wire protocols on shared pins (SDA/DQ and SCL/OD). The interface mode is auto-detected at power-up based on bus activity: presence pulses trigger 1-Wire mode, while clocked SCL transitions enable I²C mode. This dual-interface capability allows MAX17303X+T to integrate seamlessly into existing platforms using either protocol without hardware changes.

How does the SHA-256 authentication in the MAX17303X+T prevent battery cloning?

The MAX17303X+T embeds a unique 64-bit ID and a 160-bit secret key stored in secured nonvolatile memory. During host authentication, it performs a challenge-response SHA-256 hash using the secret key - a process that cannot be replicated without physical access to the IC's protected memory. This ensures only genuine battery packs with valid cryptographic signatures can operate, directly preventing counterfeit replacements. MAX17303X+T's hardware-accelerated SHA-256 engine makes this verification fast and power-efficient.

What is the significance of the 24µA quiescent current specification for the MAX17303X+T?

The 24µA active quiescent current (with FETs enabled) enables MAX17303X+T to maintain full protection and fuel gauging functionality while consuming minimal power - critical for battery-powered devices in always-on or infrequently used states. In Hibernate mode, current drops to 18µA; in Ship mode, it reaches 0.02µA. This ultra-low IQ extends shelf life and operational runtime, allowing MAX17303X+T to support multi-year deployments in wearables and medical monitors without compromising safety or accuracy.

Can the MAX17303X+T perform zero-volt charging, and how is it configured?

Yes, the MAX17303X+T supports zero-volt charging for deeply discharged cells via its ZVC pin. When ZVC is asserted (typically pulled low externally), the IC enables pre-charge current limiting and controlled voltage ramp-up before normal CC/CV charging begins. This feature is configured through hardware pin control - no register write required - ensuring fail-safe activation. Zero-volt charging is fully integrated into MAX17303X+T's JEITA-compliant charging prescription, maintaining thermal safety throughout recovery.