BQ28550DRZR-R1 Integrated Circuits (ICs)

Series:	--
Packaging:	Tape & Reel (TR)
Lead Free Status / RoHS Status:	--
Part Status:	Not For New Designs
Moisture Sensitivity Level (MSL):	--
Function:	Multi-Function Controller
Battery Chemistry:	Lithium-Ion
Number of Cells:	1
Fault Protection:	Over Current, Over/Under Voltage, Short Circuit
Interface:	I²C
Operating Temperature:	-40°C ~ 85°C (TA)
Package / Case:	12-VFDFN Exposed Pad
Supplier Device Package:	12-SON (2.5x4)
Base Part Number:	BQ28550

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PMIC - Battery Management

Power management integrated circuits (PMICs) are semiconductor devices designed to efficiently manage power utilization in various systems. In particular, PMICs that are part of battery management systems (BMS) measure, regulate, and optimize the operational behavior and parameters of Li-ion and Li-polymer battery cells.The BQ28550DRZR-R1 is a single-cell lithium ion/lithium polymer battery management IC, and is an example of a PMIC that belongs the BMS category. It is used to monitor and charge batteries in end-equipment products including cellular phones, digital cameras, portable devices, microcontrollers, and PC cards. It integrates a microcontroller subsystem with a comprehensive system of protection and monitoring circuits, along with cell-balancing functions. In addition, it contains a stand-alone charge management controller, a ModelGauge m5 algorithm, an active AC present detection (ACPR) circuit, a negative differential resistance over-charge detection and clock scaling circuit, an NTC controller/monitor, and a safety timer.

Application Field

The BQ28550DRZR-R1 is generally used for safety and high-reliability lithium-ion (Li-ion) and lithium-polymer (Li-poly) battery applications, and provides an advanced level of protection for the battery and user. It features an electrochemical impedance spectroscopy (EIS) cell impedance monitoring, programmable system interrupt, and low-battery voltage, over-temperature, and other fault detection capabilities. The IC is designed to monitor charge voltage, charge current, temperature and cell impedance, to ensure that the battery is running efficiently and safely. The BQ28550DRZR-R1 is typically used in Li-ion and Li-polymer battery packs that are used in portable consumer electronics such as cell phones, digital cameras, medical instruments, and wireless communications. It supports a wide range of battery sizes and configurations, and is designed to interface with a host processor that allows for read and write access to operational parameters.

Working Principle

The BQ28550DRZR-R1 is part of a system charged with monitoring and controlling the charging of the battery, as well as other parameters, to ensure the battery is operating safely and efficiently. It uses an active AC Present Detection (ACPR) circuit to determine the state of the AC power source, and to control the charging parameters. The ModelGauge m5 algorithm helps the IC quickly detect the battery’s state-of-charge during both fast-charging and light-load operation. The IC also contains two internal timers that are used to control the charging process. The safety timer monitors the amount of time the battery is charging, and shuts down the charging process automatically if the limit is exceeded. Another timer monitors the battery’s temperature and interrupts the charging process if the temperature limit is exceeded. In addition to charging and temperature control, the IC provides four primary protections. These include short circuit detection, over-voltage detection, over-temperature detection, and over-current detection. These protections help ensure that the battery is both safe and efficiently charged. The IC is also equipped with an Electrochemical Impedance Spectroscopy (EIS) monitoring feature, which allows it to measure the battery’s cell impedance during the charging process. This is specifically helpful for Li-ion/Li-poly batteries because this type of battery is not affected by memory effects like older, lead-acid batteries. The EIS feature is used to actively monitor the health of the battery, and to provide maximum safety for the user. In summary, the BQ28550DRZR-R1 is an advanced PMIC that is part of a Li-ion/Li-poly battery management system. It is designed to monitor and control the charging process, and to include four main protections to ensure both safety and efficient operation of the battery. It also provides a wealth of other features such as ACPR detection, ModelGauge m5 algorithm, two integrated timers, and EIS monitoring. It is designed to work in Li-ion and Li-poly battery packs used in a variety of consumer electronics, and provides advanced level of protection for both the battery and the user.

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