MAX17034GTL+

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The MAX17034GTL+ is a special purpose voltage regulator, which is part of the PMIC (power management integrated circuits) family. It is a low-power, high-accuracy fuel gauge that is specifically tailored to Lithium-Ion (Li+) battery packs, which are commonly used in mobile and consumer applications such as cell phones, GPS devices, and other battery powered electronics. The MAX17034GTL+ operates at 1.8 to 5.5V, allowing for wide compatibility in terms of power supply. This special purpose voltage regulator is based on the Coulomb Counting algorithm, which provides accurate energy estimates and remaining capacity indication, even after extended periods of use or when operated in extreme temperature conditions.

The MAX17034GTL+ contains a patented EEPROM optional data memory, where various strategic operational parameters can be stored to further optimize its performance. The data stored includes 16-bit registers for thermistor beta and offset registers, coulomb counter adjustment, voltage gain and offset, and other settings. The local temperature-compensated voltage sense amplifier uses a specially designed analog to digital converter (ADC) for accurate and efficient conversion. The internal comparator is designed to monitor the battery voltage in order to detect when the cell is in an over-discharge condition. The MAX17034GTL+ also contains an efficient FET driver, which can be used to simultaneously measure electrical current and battery temperature.

The working principle of the MAX17034GTL+ is based on a patented coulomb counting technique, also known as the “Gallagher method,” which measures the charge and discharge of the battery using a microprocessor. This information is used to estimate the amount of energy remaining in the battery, based on measurements of the charge and discharge currents, and the open circuit battery voltage. When enabled, the MAX17034GTL+ automatically starts a timer when the battery voltage is below a predefined value, which is normally strongly correlated with the Li+ battery’s minimum recommended voltage. This timer is used to limit the amount of time that the battery can remain in an over-discharged state before the device will initiate its safety steps.

The MAX17034GTL+ application field includes portable consumer applications such as portable data collection/logging systems, cellphones, portable medical devices, audio/stereo systems, flashlights, medical monitoring devices, digital audio players, DVD players, and digital camcorders. It is also used in industrial applications such as point-of-sale machines, RFID readers, security systems, power packs, and instrumentation systems that are battery powered.

In conclusion, the MAX17034GTL+ is a special purpose voltage regulator which is designed to provide accurate energy estimates and remaining capacity indicator for Li+ battery packs. It is based on a patented coulomb counting technique, and its application field includes various consumer and industrial uses.

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