DS2781E+

PMIC - Battery Management

Power management integrated circuits (PMICs) are essential components in any battery-powered system. They regulate and monitor power supply, ensure optimal battery charging and provide protective features. The DS2781E+ from Dallas Semiconductor is a small and highly integrated PMIC that is designed for handling small batteries in the range of 0.4 to 5 Ah. It is fully compatible with a wide range of battery chemistries, is fast to modify and provides a range of output options.

Application Field

The DS2781E+ PMIC is designed for protected monitoring, charging and powering of small batteries. It is ideal for use in digital still cameras, voice recorders, Bluetooth headsets and medical devices. It is also suitable for use in mobile phones, personal digital assistants, gaming systems and portable computers. This PMIC can be used to monitor a wide range of battery chemistries and technologies, including lithium-ion, nickel-metal hydride, nickel-cadmium and lithium-polymer.

Functionality

The DS2781E+ PMIC provides a range of functions and features that enable it to accurately monitor, charge and power small batteries. It provides precision monitoring of float voltage and current, along with protection against overcharge, over-discharge and overtemperature. It is designed to charge at a constant current and voltage, and provides a range of output options including NiMH, NiCd and Li-Ion. The PMIC also offers a charge completion signal and can be integrated into systems with a wide range of operating voltages, from 2.5 to 5.5V.

Hardware & Software Design Considerations

Designing a power management system with the DS2781E+ PMIC requires consideration of the hardware and software components. The PMIC needs to be connected to the battery, with the input and output wires carefully routed to prevent interference with other components. The software must be customized to control the charging and protection parameters of the device. In addition, the system needs to be compatible with the battery types that are being used and the target voltages.

Working Principle

The DS2781E+ PMIC operates by controlling the amount of power being delivered to the battery. It monitors the voltage and current of the battery to ensure it is being charged and powered correctly. The PMIC is designed to charge the battery at a constant current and voltage, with the voltage being automatically adjusted depending on the battery type and modeled after its EEPROM data. The PMIC also provides support for a wide range of battery charging and protection profiles, along with isolated output options for Li-Ion and NiMH batteries.

Conclusion

The DS2781E+ PMIC from Dallas Semiconductor is a small and highly integrated power management integrated circuit designed for handling small batteries in the range of 0.4 to 5 Ah. It is capable of charging and powering a wide range of battery chemistries and technologies and provides an array of output options. The PMIC is easy to modify and provides precision monitoring, charge and protection features.