BQ27505YZGR-J1 Integrated Circuits (ICs)

Series:	Impedance Track™
Packaging:	Tape & Reel (TR)
Lead Free Status / RoHS Status:	--
Part Status:	Not For New Designs
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:	12-UFBGA, DSBGA
Supplier Device Package:	12-DSBGA
Base Part Number:	BQ27505

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Introduction

The BQ27505YZGR-J1 is a Power Management IC (PMIC) from the battery management family which has been designed for battery-operated systems in order to extend battery life. It is a single-cell battery fuel gauge IC which has also been designed to manage and monitor single-cell Li-ion and Li-polymer rechargeable batteries. This PMIC is a complete solution from Texas Instruments (TI), as it reduces the complexity of battery related circuitry through its integrated system and provides flexible support for single-cell Li-Ion and Li-Polymer rechargeable batteries.

Application field

The BQ27505YZGR-J1 can be used in a number of applications such as portable computing, wearables, smart meters and which require accurate monitoring and management of Li-Ion and Li-Polymer battery packs. Additionally, it offers protection to the battery from unexpected overcharging or discharging. It provides varied range of voltage monitoring ranging from 2.2V to 4.4V, so it can be used across a range of Li-Ion and Li-Polymer cells. Some application domains where BQ27505YZGR-J1 is popular among users are medical supplies, wireless headsets and handheld computers. It is also used for smart meters and other networked storage products.

Working Principle

BQ27505YZGR-J1 is a Li-Ion and Li-polymer battery fuel gauge IC which provides two major functions such as battery overvoltage and undervoltage protection. It has the capability to measure battery voltage which can be monitored by software through a simple interface which goes from 2.2V to 4.4V. It is based on a coulomb counting algorithm (CCA) which is used for predicting the remaining capacity of the single-cell Li-Ion and Li-polymer batteries. It also features an I2C registered interface which allows users to configure and monitor the fuel gauge data like temperature, state of charge (SOC) and battery capacity. Additionally, it has a unique feature called ICELL that provides accurate measurement of cell balance when the battery is under charge or discharge. Another important feature is that it provides cell balancing at two levels, meaning it is able to accurately balance cells which have similar charge state. This saves time and also decreases system complexity.Finally, each IC has an integrated power line filter (IPLF) to provide improved noise immunity. This helps to avoid noise induced faults and ensures optimum readout accuracy of individual cells.

Conclusion

The BQ27505YZGR-J1 PMIC is a complete solution for single-cell Li-Ion and Li-polymer rechargeable batteries across a range of applications. It features integrated power line filter, coulomb counting algorithm, I2C register interface, and overvoltage and undervoltage protection. All these features work together to ensure optimum readout accuracy and help to extend battery life. As a result, it is an effective solution for various battery-operated systems.

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