DS2761BX-025/T&R

Power management integrated circuit (PMIC) is an integrated circuit (IC) for helping with the management of electrical power within a device. PMICs are increasingly being used within battery operated applications, due of the rising demand for multifunctional electronic devices. Battery management systems, as part of a PMIC, help regulate the electrical power and voltage state of the battery to ensure the optimal performance and optimal safety of the battery. These systems are especially important when applied to high performance Lithium-ion battery technology. One such PMIC, the DS2761BX-025/T&R, is specifically designed for use within lithium-ion battery protection.

Application Field

The DS2761BX-025/T&R is a PMIC battery management circuit that integrates precision and safety into the protection of a single cell Lithium-ion battery. It provides protection against the most severe faults, such as overcharge, overdischarge, overcurrent, and overtemperature that could occur with a battery. The device has comprehensive control, monitoring, and protection features for the battery set plant. It consists of a charge control block, a discharge control block, a protection block, and a power switch.

The DS2761BX-025/T&R is suited for applications such as laptop battery packs, PDAs, digital cameras, and mobile phones for protection against overvoltage, overcharge, and surge current. It is also a suitable choice for embedded applications that have limited resources such as microcontrollers, where their integration capabilities could offload most of the battery management tasks. Additionally, this PMIC is also ideal for portable medical devices and Lithium-ion battery based energy storage system.

Working Principle

The DS2761BX-025/T&R operates on the principles of current sensing, voltage sensing and thermal sensing. Current sensing is achieved by measuring the battery cell\'s current leakage. This can be done by measuring a voltage drop across a small resistor placed in series with the load. Voltage sensing is achieved by using an external voltage divider network to measure the battery cell\'s potential. Thermal sensing is enabled by using a negative temperature coefficient (NTC) thermistor connected in series with the battery pack.

When the current draws more than the set threshold, the PMIC will shut off the cell, removing power from the load. The charge control block will also sample the battery cell\'s voltage through the divider network and compare it with a set voltage. If the voltage is greater than a pre-set threshold, the charge control block will also shut off power to the load, preventing the battery from being overcharged. If the voltage falls too low, the discharge control block will also shut off power to the load to prevent the cell from being over-discharged.

The thermal protection block also shuts off power if the temperature of the battery rises to a certain level. This safety precaution helps to protect the battery from any damage or degradation during its charge and discharge cycles. Once the NTC thermistor temperature rises to a certain pre-set threshold, the device will initiate a shut off to prevent the battery from heating up.

The DS2761BX-025/T&R also has auto-reset and manual reset capabilities. This allows the user to reset the protection circuit to default settings if any protection threshold is tripped. The manual reset can also be used to manually reset the device after a power cycle if the protection circuit has not reset itself automatically.

Conclusion

The DS2761BX-025/T&R is an ideal choice for single cell Lithium-ion battery management systems. It is well suited to applications such as laptop battery packs, PDAs, digital cameras, and mobile phones as it provides comprehensive control, monitoring and protection features for battery management. With its current sensing, voltage sensing and thermal sensing capabilities, it ensures optimal battery performance in even the most demanding of applications. Along with its auto-reset and manual reset features, it provides users with a robust, reliable and safe battery management solution.