DS2784G+

PMIC - Battery Management

DS2784G+ is a high-performance stand-alone single-cell Li-Ion protector and gas gauge with digital temperature sensor from MAXIM Integrated, a provider of integrated analog and mixed-signal circuits. This device is designed to offer an accurate representation of the battery’s state-of-charge (SOC), state-of-charge error, cell voltage, and temperature information.

Application Field

Maxim Integrated’s DS2784G+ battery protector and gas gauge supports single-cell protection and fuel gauging for a wide variety of applications such as smartphones, tablets, digital cameras, cordless phones, GPS, camcorders, multi-media players and other portable electronics.

Working Principle

The DS2784G+ is a highly integrated device that monitors battery current, cell voltage, and temperature, and performs gas gauge functions. It contains 16-bit μP-based analog front-end circuits to measure current, voltage, and temperature. It uses an internal Kelvin sense resistor of low-value less than 1mΩ to measure the current. The processor uses an integrated self-learning algorithm to determine the battery-specific parameters after which the charge and protection functions are based.

The fuel gauge features a patented open circuit voltage technique to measure the absolute state-of-charge (SOC) of the cell, with the ability to accurately estimate cell capacities from 20mAh to 100Ah. It also features statistical analysis to estimate the relative state-of-charge (RSC) in case the absolute SOC measurement is not feasible. In addition, the DS2784G+ includes an 8 bit digital output to provide temperature data.

The DS2784G+ provides accurate cell protection using both hardware and software. It includes dual EEPROM memory for single-cell protection parameters and read/write protection. In addition to providing onboard protection for single-cell, dual-cell, and multi-cell stacks, this device also provides safety protection from over-charging, over-discharging and over-temperature. The EEPROM memory has 8K/32K/64K space to store data.

The device has several styles of open-drain outputs for protection and communication interface functions. These outputs can be interfaced to the high-side switches for single-cell protection, the system load, other Maxim Integrated ICs, or diagnostics (e.g., LED driving). The built-in diagnostics include open-drain output to detect IC failures and LED driving circuits.

Conclusion

Maxim’s DS2784G+ battery protector and gas gauge is a compact and powerful single-cell Li-Ion protector and gas gauge. It provides accurate measurement of state-of-charge, state-of-charge error, cell voltage, and temperature and uses patented techniques including open circuit voltage technique to measure the absolute SOC. It also provides onboard protection and safety protection from various overages, and includes dual EEPROM memory for data storage and read/write protection. It is designed to be used on different portable electronic devices to offer accurate and reliable performance.