MAX17301X+T vs MAX17303G+ Battery Fuel Gauge ICs: A Detailed Comparison

1. Quick verdict

For straightforward, space-constrained designs requiring a single-cell lithium-ion/polymer fuel gauge with basic fault protection and I2C interface, the MAX17301X+T is a solid choice due to its smaller 15-WLP package and straightforward implementation. However, for applications demanding advanced protection features, ultra-low quiescent current during deep-sleep modes, and extensive configurability—including programmable thresholds and SHA-256 authentication—the MAX17303G+ is the better option, despite its larger 14-TDFN (3x3 mm) package.

2. Spec comparison table

SpecMAX17301X+TMAX17303G+Notes
Battery chemistryLithium Ion/PolymerLithium Ion/PolymerEquivalent chemistry support
FunctionFuel GaugeFuel GaugeEquivalent function
Number of cells11Single-cell only
Fault protectionOver Current, Over Temperature, Over Voltage, Short CircuitOver Current, Over Temperature, Over/Under Voltage, Short CircuitMAX17303G+ adds undervoltage protection, enhancing battery safety
InterfaceI2CI2CEquivalent
Mounting typeSurface MountSurface MountEquivalent
Operating temperature range-40°C to +85°C-40°C to +85°CEquivalent
Package15-WLP (1.68 x 2.45 mm)14-TDFN (3 x 3 mm)MAX17301X+T smaller footprint; important for space-constrained designs
Typical active currentNot specified24 μAMAX17303G+ provides low active current for power savings
Hibernate current (typ)Not specified18 μAMAX17303G+ supports lower power hibernate mode
Ship mode current (typ)Not specified7 μAMAX17303G+ supports very low ship mode current
Deep ship current (typ)Not specified0.5 μA / 0.02 μA (deep ship2)MAX17303G+ excels in ultra-low leakage for shipping/storage
Memory sizeNot specified122 Bytes user memoryMAX17303G+ offers nonvolatile user memory for customization
Absolute max input voltageNot specified40 VSupports wide voltage margin on MAX17303G+
Output current (typ/max)Not specified50 mA / 100 mAMAX17303G+ can drive higher load currents on alert/interrupt pins
Switching frequency (typ)Not specified2 MHz (500 kHz min, 5 MHz max)MAX17303G+ supports high-frequency operation, relevant for internal ADC/filtering
Programmable protection thresholdsNo dataYes (OV, UV, OT, etc.)MAX17303G+ provides flexible protection threshold programming
AuthenticationNoSHA-256 AuthenticationMAX17303G+ supports secure authentication to prevent counterfeit or tampering
Temperature measurementInternal die tempInternal die temp + thermistor input (TH pin)MAX17303G+ supports external thermistor for more accurate battery temp sensing
Battery aging reportingNo dataYes, three methods (capacity reduction, resistance increase, calendar aging)MAX17303G+ offers advanced battery health monitoring
Fuel gauge algorithmNot specifiedModelGauge m5 EZ algorithmMAX17303G+ uses a proven algorithm combining coulomb counting and voltage
Quiescent current in protection modeNot specified10 μA (typ)MAX17303G+ efficient in protected standby
Package pitchNot specified0.5 mmStandard pitch for 14-TDFN, easier for assembly than 15-WLP
I2C bus speed maxNot specified400 kHzStandard I2C speed; both likely support this
Voltage threshold resolutionNot specified10 mVMAX17303G+ allows fine voltage threshold programming
Current threshold resolutionNot specified400 μVMAX17303G+ allows fine current threshold programming
Overcurrent detection timingNot specifiedFast: 70 μs min, 985 μs typ; Medium: 1 ms to 15 ms typ; Slow: 1 ms to 15 ms typMAX17303G+ provides fine-tuned fault detection timing
Package thermal resistance (Junction-to-Ambient)Not specified54 °C/W (single-layer), 41 °C/W (4-layer)Important for thermal design on MAX17303G+
Programming supply current for memoryNot specified2 mA min, 5.5 mA typMAX17303G+ requires consideration for programming current spikes
Memory write enduranceNot specifiedLimited writes (e.g., 7 writes max for nConfig)MAX17303G+ requires firmware to manage write cycles carefully
Typical application circuit complexitySimpleMore complexMAX17303G+ requires more external components (e.g., thermistor, more pins)
Package size (L x W mm)1.68 x 2.453 x 3MAX17301X+T is significantly smaller, better for compact designs
Design capacity supportNot specified1000 mAh typicalMAX17303G+ calibrated for typical battery sizes
Data retentionNot specified10 years (min)MAX17303G+ supports long-term data retention
Firmware execution time (typ)Not specifiedActive: 351 ms; Hibernate: 1.4 sMAX17303G+ firmware timing considerations for driver design

3. Design trade-offs

The MAX17301X+T and MAX17303G+ share the fundamental role of a single-cell lithium-ion/polymer fuel gauge with I2C interface and basic protection features. However, their package choices and feature sets mark a clear differentiation.

The MAX17301X+T’s 15-WLP package (1.68 x 2.45 mm) is considerably smaller than the MAX17303G+’s 14-TDFN (3 x 3 mm). This makes the MAX17301X+T better suited for ultra-compact designs where PCB real estate is at a premium. However, WLP packages come with tighter layout constraints and higher assembly complexity, typically requiring advanced manufacturing processes and careful thermal management due to less exposed pad surface area for heat dissipation.

In contrast, the MAX17303G+’s larger TDFN package allows easier PCB assembly and better thermal performance. It has a clearly defined exposed pad and a 0.5 mm pitch, which is more straightforward for standard assembly and rework. The thermal resistance figures (54°C/W single-layer, 41°C/W four-layer) suggest that the MAX17303G+ can dissipate heat more effectively, which is crucial if operating near the upper temperature limit or in high-current scenarios.

From a firmware and system design perspective, the MAX17303G+ offers a richer set of programmable protection features, including undervoltage, overvoltage, overtemperature, and short-circuit protections with configurable thresholds and timers. This flexibility enables tighter integration into battery management systems with safety-critical requirements, but it also demands more complex firmware to configure and monitor these protections properly.

The MAX17303G+ includes SHA-256 authentication, adding a layer of security to prevent unauthorized or counterfeit battery packs—an increasingly important feature in commercial and industrial products. The presence of nonvolatile user memory (up to 122 bytes) allows storage of application-specific data, which can be leveraged for more advanced battery health diagnostics and lifetime tracking.

Power consumption is another critical differentiator. The MAX17303G+ specifies extremely low quiescent currents down to 0.02 μA in deep-ship mode, significantly extending shelf life for battery-powered devices. The MAX17301X+T does not provide detailed power consumption data, which may indicate higher standby currents or less aggressive power-saving modes.

Cost-wise, the smaller WLP package of the MAX17301X+T might be more expensive per unit due to packaging and assembly complexity, despite the smaller size. The MAX17303G+’s TDFN package is a more conventional choice, likely offering better price-performance balance at volume, especially when full protection and security features are required.

4. Use-case fit

Choose MAX17301X+T when…

Choose MAX17303G+ when…