BQ27501DRZT Integrated Circuits (ICs)

Series:	Impedance Track™
Packaging:	Tape & Reel (TR)
Part Status:	Not For New Designs
Function:	Battery Monitor
Battery Chemistry:	Lithium-Ion
Number of Cells:	1
Fault Protection:	Over Temperature
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:	BQ27501

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PMIC - Battery Management

The BQ27501DRZT is an integrated system-on-chip designed for battery management applications. It is a versatile low-power device that offers a battery fuel gauge solution and enables a host system supervisor to monitor the state of a rechargeable battery. This chip is designed to help improve battery life and provide superior performance for various types of batteries, including Li-ion and Li-polymer.The BQ27501DRZT integrates a custom fuel gauge with the capacity to intelligently monitor and measure battery performance. The device integrates several hardware blocks, allowing the user to accurately measure battery temperature, voltage, charge, and discharge current. It also offers a unique fuel gauge design that incorporates a macro-model to monitor battery capacity and self-calibrates based on charge cycles.The most important feature of the BQ27501DRZT is its integrated battery protection circuit. This integrated circuit operates as a Low-voltage cut-out and High-voltage cut-off. It can be configured to provide the desired level of protection to batteries and enable safe charge and discharge operations. The BQ27501DRZT implements a Direct battery voltage measurement scheme. This scheme involves monitoring the battery’s terminal voltage and then subtracting the cell’s internal resistance (Rint) from the measured value to obtain the battery’s actual voltage. This approach significantly improves battery voltage accuracy, especially for long battery strings.The other main feature of the BQ27501DRZT is its automatic cell balancing module. This module helps maintain an optimal cell balance during charge and discharge. Through a programmable equalization algorithm, the cell balancing module automatically adjusts voltage between cells or groups of cells, allowing a complete balance between cells. The BQ27501DRZT also offers a configurable alert system. This alert system has the capacity to monitor important internal parameters, including voltage, temperature, and current so that the user can better understand the battery’s health. The device is ideal for application fields where space is a concern such as smart phones, tablets, and other portable electronic devices. The low-power device also holds various specialized functions for battery management including charging, discharging, voltage monitoring, temperature monitoring, and capacity tracking. To summarize, the BQ27501DRZT is a versatile low-power system-on-chip designed for battery management in various types of rechargeable batteries. It leverages its integrated fuel gauge, low-voltage cut-off, high-voltage cut-off, direct battery voltage measurement, cell balancing, and alert system which allow the user to accurately monitor and manage battery performance. This highly-integrated device is ideal for application fields such as smart phones and tablets.

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