MAX17303G+ vs MAX17301G+ Battery Fuel Gauge ICs: A Component Comparison

1. Quick verdict

For applications requiring a single-cell lithium-ion/polymer fuel gauge with comprehensive programmable fault protection and low quiescent current, the MAX17303G+ is the superior choice due to its detailed specification and advanced features like internal self-discharge detection and SHA-256 authentication. The MAX17301G+ is a simpler fuel gauge option suitable for basic single-cell monitoring where fewer advanced features and protection configurability are acceptable, and cost or simplicity is prioritized.

2. Spec comparison table

SpecMAX17303G+MAX17301G+Notes
FunctionFuel GaugeFuel GaugeBoth serve as fuel gauges for single-cell batteries.
Battery chemistryLithium Ion/PolymerLithium Ion/PolymerIdentical chemistry support.
Number of cells11Both support single-cell applications only.
Fault protectionOver Current, Over Temperature, Over/Under Voltage, Short CircuitOver Current, Over Temperature, Over/Under Voltage, Short CircuitBoth offer same fault protection types.
InterfaceI2CI2CBoth use I2C interface, standard for fuel gauges.
Operating temperature range-40°C to 85°C (TA)-40°C to 85°C (TA)Identical operating temperature ranges.
Mounting typeSurface MountSurface MountSame mounting type.
Package case14-WFDFN Exposed Pad14-WFDFN Exposed PadIdentical package case and size (14-TDFN, 3x3 mm).
Typical active current24 μANot specified in source dataMAX17303G+ provides explicit low active current figure; unknown for MAX17301G+.
Typical hibernate current18 μANot specifiedSame as above.
Typical ship mode current5 μANot specifiedSame as above.
Deep ship mode current0.5 μA / 0.02 μANot specifiedMAX17303G+ supports deep ship modes with very low current.
Memory size122 Bytes (nonvolatile)Not specifiedMAX17303G+ offers defined memory size for configuration and logging.
Absolute max input voltage40 VNot specifiedMAX17303G+ rated for 40 V max input, useful for protection margin.
Max output current100 mANot specifiedMAX17303G+ can source/sink up to 100 mA, useful for FET gate drive or alarms.
Input voltage range4.5 V min to 4.2 V maxNot specifiedMAX17303G+ supports typical Li-ion cell voltage range.
Switching frequency500 kHz min, 2 MHz typ, 5 MHz maxNot specifiedRelevant for internal switching regulators or ADC sampling in MAX17303G+.
Temperature threshold range-40°C to 85°CNot specifiedMAX17303G+ programmable thresholds.
Programmable voltage/current thresholdsYes (multiple registers for thresholds)Not specifiedMAX17303G+ supports detailed programmable thresholds for protection.
SHA-256 AuthenticationYesNot specifiedMAX17303G+ supports SHA-256 authentication for security.
Internal self-discharge detectionYesNot specifiedMAX17303G+ includes this feature, useful for battery health monitoring.
Firmware task execution time351 ms (active), 1.4 s (hibernate)Not specifiedMAX17303G+ specifies firmware timing impacting polling intervals and responsiveness.
Quiescent current modesActive: 24 μA; Hibernate: 18 μA; Ship: 5 μANot specifiedMAX17303G+ offers detailed power modes for low power design.
Temperature measurementInternal die temperature + thermistor input (TH pin)Not specifiedMAX17303G+ supports thermistor monitoring for battery temperature.
Package pitch0.5 mmNot specifiedMAX17303G+ package pitch typical.
Memory registersExtensive register map (0x000–0x1FF)Not specifiedMAX17303G+ has extensive register map for fuel gauge and protection configuration.
Design capacity (typical)1000 mAhNot specifiedMAX17303G+ example design capacity.
Operating voltage minimum2.16 V2.3 VMAX17303G+ supports slightly lower min voltage, useful for deeply discharged cells.
Package size3 mm x 3 mm3 mm x 3 mmIdentical.
Supplier device package14-TDFN (3x3)14-TDFN (3x3)Identical.
Mounting and footprintSurface mount, 14-WFDFN exposed padSurface mount, 14-WFDFN exposed padIdentical.

Note: The MAX17301G+ datasheet provides less detailed information publicly; many specs are unspecified or unavailable in the provided data.

3. Design trade-offs

The MAX17303G+ clearly targets applications requiring sophisticated battery management with a strong emphasis on precision, configurability, and security. Its low active and hibernate currents (24 μA and 18 μA respectively) enable power-sensitive designs, extending battery life during idle periods. The support for deep ship modes with ultra-low currents (down to 0.02 μA) is particularly valuable for devices shipped with batteries installed but needing minimal drain, such as IoT or medical devices. In contrast, the MAX17301G+ lacks detailed current consumption specs in the data available, suggesting either simpler power modes or less emphasis on ultra-low power states.

The extensive register map and programmable protection thresholds in MAX17303G+ allow firmware engineers to fine-tune fault protection parameters (overcurrent, over/under voltage, temperature limits) to the specific battery chemistry and application load profile. The inclusion of SHA-256 authentication adds a layer of security in battery authentication, which can be critical for preventing counterfeit battery usage and ensuring safety in regulated products. The MAX17301G+ does not explicitly document these features, indicating a more basic fuel gauge functionality.

From a PCB layout perspective, both devices share the same 14-TDFN 3x3 mm package with exposed pad for thermal dissipation, simplifying mechanical and thermal design considerations. However, the MAX17303G+’s ability to handle max continuous output currents of 100 mA (likely for gate drive or alert signals) suggests it can directly control external FETs or signaling lines, reducing component count. This may translate into fewer external components, smaller BOM, and potentially improved system reliability.

The MAX17303G+ also demonstrates a wider input voltage tolerance (up to 40 V absolute max), which can provide additional margin in fault conditions or battery pack design variations. Its minimum operating voltage of 2.16 V is slightly lower than MAX17301G+’s 2.3 V, which could be meaningful in applications where cells are deeply discharged and system operation at lower voltages is required.

Cost-wise, while exact pricing isn’t provided here, the MAX17301G+ is likely positioned as a cost-effective option with fewer features, suitable for simpler designs. The MAX17303G+’s advanced features and configurability come at the expense of increased design complexity, firmware effort, and potentially higher component cost.

4. Use-case fit

Choose MAX17303G+ when…

Choose MAX17301G+ when…