BQ78412DDWR

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Power Management Integrated Circuit (PMIC) is an integrated circuit (IC) that helps in managing the power consumption in a wide variety of applications. A PMIC can provide considerable power savings and often reduce the need for component-level power management. PMICs can be found in a vast range of products, from consumer electronics, such as mobile phones, to automotive, industrial, and medical systems.Battery Management is a subcategory of PMIC where Variable Battery Voltage Regulators (VBVR) are used for maximizing the life of the battery and for extending the overall system performance. The BQ78412DDWR is a VBVR from Texas Instruments. It is part of their Battery Management family and has several applications.

Application

The BQ78412DDWR is designed to manage two chargeable batteries, specifically Li/ion/polymer batteries, having a maximum charging current of 4A. Thanks to its accurate battery switching control, “race to charge” is efficiently prevented. This device offers an elimination of printed circuit board complexity and system cost reduction with its four pin interface and high design flexibility.The device can be used in a wide range of products that requires two Li/ion/polymer batteries, such as power tools, vacuum cleaners, surveillance camera, home automation gadgets etc. It eliminates the need for two battery chargers, thus reduces the total cost and size of the design. It can also be used in applications that require simultaneous switching and charging of two Li/ion/polymer batteries.

Features

The BQ78412DDWR features include a Programmable Current Detectors, as well as Hiccup/Analog Limiting. It has Over Temperature Protection, as well as Over Voltage Protection and Under Voltage Protection. In addition to this, the device also offers soft start, allowing it to charge two Li/ion/polymer batteries while guarding against Over Temperature and Over Voltage conditions. Furthermore, the device has an independent over current limit for each battery, assuring wider battery-life.

Working Principle

The BQ78412DDWR is a dual channel VBVR, which help in managing the battery voltage for two Li/ion/polymer batteries. The device features two battery inputs, two charge/discharge outputs, one programming input, one control output and one dual limit signal output.The VBVR works in the following way: it first checks the status of the two batteries. If both the batteries need to be charged (low voltage in the two batteries) the two batteries are connected in parallel and they are charged at the same time. If only one of the batteries needs to be charged, then it is connected separately. This separation of the two batteries helps in avoiding the situation of “One Battery charging and the other not”.The device also monitors and control the charge/discharge and Over Temperature/Over Voltage/Under Voltage conditions. It also provides protection against over current, hiccup and analog limiting with its Programmable Current Detectors.

Conclusion

In conclusion, the BQ78412DDWR is an advanced Variable Battery Voltage Regulator from Texas Instruments, designed to manage two Li/ion/polymer batteries. It is part of the PMIC family of devices, and could be used in a variety of applications, from consumer electronics, to automotive, industrial, and medical systems. It features several advanced features that help in providing long battery life and improved system performance.

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