BQ27421YZFR-G1D

Series:	Impedance Track™
Packaging:	Tape & Reel (TR)
Lead Free Status / RoHS Status:	--
Part Status:	Active
Moisture Sensitivity Level (MSL):	--
Function:	Battery Monitor
Battery Chemistry:	Lithium-Ion
Number of Cells:	1
Fault Protection:	--
Interface:	I²C
Operating Temperature:	-40°C ~ 85°C (TA)
Package / Case:	9-UFBGA, DSBGA
Supplier Device Package:	9-DSBGA

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Introduction
The BQ27421YZFR-G1D is a versatile integrated battery management IC intended to meet the needs of the ever-evolving portable electronics market. With precision voltage regulation, integrated FETs and safety features, this advanced IC helps simplify the design of battery management systems for multiple applications. It is designed for both single cell Li-ion and multi-cell Li-ion/Li-polymer battery packs up to 6S and 10 cells, respectively. In addition, the BQ27421YZFR-G1D features cutting-edge technology to help increase performance, reduce design costs, and improve system efficiency. This article will provide an in-depth look at the application field and working principles of the BQ27421YZFR-G1D battery management IC.

Application Field
The BQ27421YZFR-G1D is designed to work with Li-ion/Li-polymer chemistry batteries of up to 6S (single cell) and 10S (multi-cell) pack configurations. It is well suited for use in a wide variety of mobile applications, including portable electronic devices, electric vehicles, smart appliances, and medical systems, among many others. The advanced architecture of the BQ27421YZFR-G1D IC also makes it well-suited for use in a number of static applications, such as UPS backup power supplies.

The IC is also able to interface with a wide range of peripherals, including temperature sensors, coulomb counters, gas gauge chips, current sensors, USB connectors, and other battery management implementation peripherals. This allows the IC to be incorporated into new and existing designs efficiently, while providing the necessary reliability and safety features needed for demanding applications. Since the BQ27421YZFR-G1D can be used in multiple types of batteries, it provides a great solution for developers who need to manage varying battery requirements.

Working Principle
The BQ27421YZFR-G1D operates on three main principles: voltage regulation, management of charge and discharge cycles, and safety. The voltage regulation circuitry enables precise voltage regulation to be maintained across a single cell, multiple cells, or a complete pack. This helps to ensure that the battery is always operating at the proper voltage level. With the integrated FETs, the voltage regulation circuit will automatically switch between charge and discharge cycles, allowing the BQ27421YZFR-G1D to handle variable loads efficiently and without overloading the battery.

The BQ27421YZFR-G1D is also equipped with several safety features to protect the device, including an embedded cell monitor (ECM), low battery protect (LBP), and over current protection (OCP). The ECM monitors and records the voltage levels of each cell in real time, preventing overcharge or over discharge of any cells. The LBP feature monitors the voltage levels of all cells and shuts down the IC when the detection limit is reached. The OCP feature protects the system against short circuits and prevents excessive current.

The BQ27421YZFR-G1D also incorporates robust interface communication and control capabilities. This allows the IC to interface with a variety of external components, such as temperature sensors, coulomb counters, gas gauge chips, and current sensors. Using the SPI and I2C communications ports, the IC can interface with digital controllers and host MCUs. This gives developers a powerful and easy to use platform for battery management solutions.

Conclusion
The BQ27421YZFR-G1D is a versatile and advanced battery management IC designed to meet the demanding needs of the portable electronics market. It offers advanced voltage regulation, integrated FETs, safety features, and robust interface communication and control capabilities. Thanks to its wide range of application fields and cutting-edge technology, the BQ27421YZFR-G1D provides a great solution for both new and existing designs.

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