Analog Devices Inc./Maxim Integrated MAX17201G+T

Overview

The MAX17201G+T from Maxim Integrated is a stand-alone, ultra-low-power fuel gauge IC implementing the ModelGauge™ m5 algorithm for single-cell Li-ion/Li-polymer battery packs. It delivers ±1% state-of-charge (SOC) accuracy across temperature (-20°C to +60°C), aging, and discharge rates without host configuration, uses 2-wire I²C interface, and integrates SHA-256 authentication with unique 64-bit ID for anti-cloning in portable consumer devices.

For engineers reviewing the MAX17201G+T datasheet, MAX17201G+T pinout, MAX17201G+T application, or MAX17201G+T equivalent, this page provides verified technical context, validated pin functions, confirmed single-cell monitoring capability, authentic I²C communication mode, and two field-validated alternative fuel gauges with documented functional trade-offs.

Technical Context

The MAX17201G+T operates as a self-contained fuel gauge with no host dependency-its ModelGauge m5 algorithm fuses coulomb counting and voltage-based estimation using real-time temperature compensation (die + up to two external thermistors) and adaptive learning of cell aging. It supports ratiometric auxiliary ADC inputs for precise thermistor measurement and embeds nonvolatile memory for learned parameters and history logging.

Unlike host-dependent gauges, it autonomously computes time-to-empty (TTE), time-to-full (TTF), Cycle+ age forecast, and three independent battery age metrics (capacity loss, resistance growth, cycle count). Its 2-wire I²C interface complies with SBS 1.1 register mapping and enables direct integration into battery management subsystems without firmware overhead.

Key Specifications

Pinout & Package

MAX17201G+T is housed in a lead-free, 3mm × 3mm, 14-pin TDFN package with exposed pad (EP) for thermal dissipation. Pin numbering follows standard TDFN top-view convention with pin 1 marked by dot or chamfer.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BQ27426YZFT, MAX17201G+T eliminates host dependency and adds cryptographic security; compared with MAX17205G+T, it offers lower quiescent current and simplified single-cell layout but no balancing capability - choice depends strictly on cell count and security requirements.

Availability

MAX17201G+T is available at Aetrix Electronics and suitable for smartphones and tablets, portable medical equipment, e-readers, and digital still cameras requiring stable component supply, long-term lifecycle support, and guaranteed authentic Maxim Integrated silicon.

Supply support for MAX17201G+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

Maxim Integrated (now part of Analog Devices) designs precision analog, mixed-signal, and power management ICs for demanding industrial, automotive, and consumer applications.

The MAX1720x product line delivers stand-alone fuel gauging solutions optimized for single- and multicell Li-ion battery packs in space-constrained portable electronics where accuracy, security, and zero-host overhead are mandatory.

FAQ

What is the primary function of the MAX17201G+T in a battery management system?

The MAX17201G+T serves as a fully autonomous fuel gauge IC that measures and reports battery state-of-charge (SOC), time-to-empty (TTE), time-to-full (TTF), and aging metrics without host processor involvement. It implements Maxim's ModelGauge m5 algorithm to deliver ±1% SOC accuracy across temperature, aging, and load conditions - making the MAX17201G+T ideal for single-cell Li-ion packs in portable electronics where firmware simplicity and reliability are critical.

Does the MAX17201G+T support multicell battery packs?

No, the MAX17201G+T is specifically designed for single-cell Li-ion or Li-polymer battery packs. It lacks cell balancing circuitry and does not support voltage monitoring across multiple series cells. For 2S or 3S packs, Maxim specifies the MAX17205G+T or MAX17215 variants - those include dedicated cell voltage inputs and balancing drivers, whereas the MAX17201G+T's pinout and internal architecture are fixed for single-cell topology.

How does the MAX17201G+T achieve high fuel gauge accuracy without calibration?

The MAX17201G+T achieves ±1% SOC accuracy through its ModelGauge m5 algorithm, which continuously fuses real-time coulomb counting with open-circuit voltage (OCV) modeling and temperature-compensated aging adaptation. It learns battery characteristics over time and corrects for drift automatically - eliminating the need for factory or field calibration. This autonomous learning is stored in nonvolatile memory, so the MAX17201G+T maintains accuracy across power cycles without host intervention.

What interface protocol does the MAX17201G+T use, and is it compatible with standard battery management software?

The MAX17201G+T uses a 2-wire I²C interface compliant with the Smart Battery System (SBS) 1.1 specification, including standardized register addresses for SOC, voltage, current, temperature, and status. This ensures direct compatibility with existing host controllers and battery management firmware stacks that implement SBS - no custom driver development is needed. The MAX17201G+T does not support 1-Wire (that variant is MAX17211); interface selection is fixed per part number.

What security features does the MAX17201G+T provide against counterfeit battery packs?

The MAX17201G+T integrates hardware-accelerated SHA-256 authentication with a programmable 160-bit secret key and a unique, factory-programmed 64-bit ID per unit. During system boot or pack insertion, the host can challenge the MAX17201G+T to prove authenticity - preventing unauthorized or cloned battery packs from operating. This cryptographic binding ensures supply chain integrity and protects end-user safety, a feature absent in most competing fuel gauges like the BQ27426YZFT.