DS2775G+

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PMICs, or power management integrated circuits, allow efficient and optimized power management solutions. One specialized PMIC is the DS2775G+, a battery fuel gauge which provides precise, accurate long-term battery capacity monitoring. It is well-suited for use in consumer, industrial and automotive applications.

Application Field

The DS2775G+ battery fuel gauge is a precision system-on-chip integrated circuit for monitoring primary, rechargeable and secondary cell-based battery packs. It expands the designer’s lithium-ion battery management design capability with a combination of high accuracy, improved precision and a higher rate of derivative technology. The DS2775G+ integrates a current sense amplifier for a shunt resistor, temperature sense circuits and an on-chip Coulomb counter. It also supports a bidirectional I2C and SMBus interface.

The DS2775G+ is an excellent choice for battery-packed applications requiring precise measurements, as it provides a resolution as low as 0.005% full-scale range and an accuracy of 2%. It is suitable for a variety of applications, including smartphones and tablets, wearable devices, handheld panoramic navigation systems, digital cameras, medical devices, automotive devices and other applications requiring accurate, safety-compliant battery monitoring and management solutions.

Working Principle

The primary function of the DS2775G+ is to track and display the remaining capacity of the battery pack in a system. The device incorporates a robust 24-bit Coulomb counter and a voltage measurement system. It measures current by accessing the voltage drop across a sense resistor with its on-chip amplifier, and it samples the voltage of the battery cells to derive the pack voltage and cell voltages. The device then integrates the current to provide measureable charge accumulations over a battery life cycle.

The full-scale range of the device is 12 bits programmable, allowing current and voltage sensing over a wide range. The resolution of the device is also programmable, allowing for very precise measurements. The accuracy of the device is 2 percent, and its update rate is fast (<100µS), making it suitable for monitoring high currents and large capacitive loads.

The DS2775G+ is also capable of predicting and predicting when the battery will run out of charge. This information can be used in battery management systems to conserve energy, report when a battery needs to be replaced, and/or provide insulation from unexpected power-down events. The device also features an Automatic Power Shutdown (APS) feature which will automatically shut down the system when the remaining cell capacity drops below a pre-configured level. This prevents batteries from being discharged below safe levels and helps extend battery life.

The DS2775G+ also offers a wide range of features to improve system reliability and safety. These features include an extended temperature range, over voltage protection, over current protection and short circuit protection.

In summary, the DS2775G+ is a highly efficient and precise battery fuel gauge which provides accurate long-term battery capacity monitoring. It is ideal for use in numerous applications, where accuracy and safety are paramount. With its wide range of features and its high resolution and accuracy, the DS2775G+ is an excellent choice for battery-pack applications.

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