High accuracy battery fuel gauge maximizes battery capacity and boosts user confidence

March 12, 2013 // By Paul Buckley
Maxim Integrated Products, Inc. has begun sampling the MAX17050, the industry’s highest accuracy battery fuel gauge.

The device uses the company’s patented ModelGauge m3 algorithm, which improves upon the traditional coulomb counting approach by combining it with the patented voltage-based ModelGauge approach. The MAX17050 provides the best possible accuracy, uses 4x less power, and shrinks solutions by 3x compared to competitive devices. The device is ideal for portable applications where battery capacity and state-of-charge accuracy is critical, including smartphones, tablets, mobile radios, battery backup, and portable medical/fitness equipment.

Battery fuel gauge designs often depend on coulomb-counting technology. Although coulomb counting is highly accurate for a short period of time, it tends to drift over time. The MAX17050 uniquely integrates the short-term accuracy and linearity of a coulomb counter with the excellent long-term stability of a ModelGauge fuel gauge. The ModelGauge m3 technology makes continuous microcorrections and eliminates sudden jumps in a battery’s state of charge (SOC). Users can trust the resulting battery capacity and state information, including the health and maximum battery usage. The MAX17050 functionality is also integrated into the company's TINI Power System-on-Chip (SoC) to make it easier to upgrade designs to more complex systems.

The integrated coulomb counting and ModelGauge technology automatically compensates for aging, temperature, and discharge rate; provides accurate SOC and time-to-empty over a wide range of operating conditions, as well as battery health information.

Sophisticated SOC, voltage, and temperature alerts allow the system microprocessor to remain in sleep mode for a longer period of time.

The MAX17050 functionality is available in a Power SoC with identical IP to facilitate a complete power-management solution in a shortened time to market.

Availability and Pricing

The MAX17050 battery fuel gauge is available in a 0.4 mm pitch, 9-bump wafer-level package (WLP).

Pricing starts at $1.51 (1000-up, FOB USA).

Visit Maxim Integrated at www.maximintegrated.com

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