BQ20Z655DBT-R1

Series:	Impedance Track™
Packaging:	Cut Tape (CT)
Lead Free Status / RoHS Status:	--
Part Status:	Active
Moisture Sensitivity Level (MSL):	--
Function:	Multi-Function Controller
Battery Chemistry:	Lithium-Ion/Polymer
Number of Cells:	2 ~ 4
Fault Protection:	Over Current, Over Temperature, Over/Under Voltage, Short Circuit
Interface:	SMBus
Operating Temperature:	-40°C ~ 85°C (TA)
Package / Case:	44-TFSOP (0.173", 4.40mm Width)
Supplier Device Package:	44-TSSOP

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：Introduction
The BQ20Z655DBT-R1 could be classified as a PMIC (Power Management Integrated Circuit) under the Battery Management sector. This particular PMIC is designed for the purpose of regulating and monitoring the parameters that are associated with the battery life management. Such parameters include cell balancing, gas gauging and safety management. Understanding the application field and working principle of this device is essential in order to appreciate its value, as well as its limitations.
Application Field
The BQ20Z655DBT-R1 can be found commonly utilised in both consumer and industrial electronics systems. Its primary mission is to manage the battery parameters within a broad range of applications and systems. By monitoring the parameters that are linked to battery management and life, it is able to lower the risk of any system failures due to battery failures and/or obsolete battery conditions. It features full system support functions and optimised power management modes, which will help to extend the system’s battery life and reduce unnecessary power wastage.
The BQ20Z655DBT-R1 supports a wide range of chemistries, such as Li-Ion (Lithium Ion), Li-Poly (Lithium Polymer), NiCd (Nickel-Cadmium) and NiMH (Nickel-Metal Hydride) cells. These battery types are typically found within a broad range of mobile communication systems, embedded systems, and automotive systems. Furthermore, it has the capabilities to support up to 10-cell packs, thus supporting longer battery runtime and higher power parameters throughout a diverse range of applications.
Working Principle
The BQ20Z655DBT-R1 works by making use of a suite of tools designed to optimise the battery and system performance. One of these tools is cell balancing, which works to ensure that the entire battery pack is supplied with equal amounts of power. This will prevent any single cell from running at a lower or higher voltage than others, thus diminishing the risk of underpowered or overcharged cells. It utilises an external Digital-to-Analog Converter, commonly found within eight- or sixteen-bit designs, to accurately measure and profile the voltage and temperature of each cell.
The BQ20Z655DBT-R1 also contains a function known as "gas gauging". This system works to monitor the amount of battery life and energy levels within each cell. This helps to alert the performance assessment and power management systems when the battery pack needs to be charged or discharged. Finally, the safety management mechanism of the BQ20Z655DBT-R1 works to monitor the temperatures, voltages and current of each cell. This helps to prevent any short circuit events and safety-related system failures.
Conclusion
In conclusion, the BQ20Z655DBT-R1 is a powerful PMIC with a wide-ranging set of features designed to manage and optimise the parameters associated with battery life and performance. Its application field mainly covers consumer and industrial electronics systems, wherein it provides-cell balancing, gas gauging and safety management functions. All of these tools are designed to improve the system\'s performance, extend its battery life and reduce unnecessary power wastage. By understanding the working principle of the BQ20Z655DBT-R1, one can truly appreciate its value in managing the performance of battery packs.

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