BQ34Z651DBT

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Power management integrated circuits (PMICs) are essential semiconductor components used to monitor and control multiple voltages, currents, and temperatures on a single integrated circuit, bridging the gap between underlying power sources and various power-consuming circuitries. PMICs are widely used in nearly all modern electronics, across multiple industries such as automotive, computing, industrial, and communication. PMICs become increasingly specialized, smaller and more efficient, making them highly suitable for wearables, IoT devices and other space- or power-constrained projects, and with growing importance of Li-ion battery management, emerging PMICs also come designed specifically for this purpose, such as the BQ34Z651DBT.

Battery Management with BQ34Z651DBT

The BQ34Z651DBT is a gas gauge IC with built-in safety and dynamic power management capabilities, offering system designers a complete, protected, intelligent solution for monitoring and managing battery-powered system. The BQ34Z651DBT is a cost-efficient, easy-to-implement, high-accuracy, multi-chemistry battery fuel gauge with an integrated protected Li-ion charge and discharge system. This IC is designed to be used in Li-ion battery packs ranging from 2-cells to 18-cells and features an on-chip safety circuit, which provides an effective monitoring and protection solution to protect the battery pack during charge and discharge. Furthermore, it includes a register-based command set for fully-customizable power management for various power schemes.

Key Features

• High accuracy fuel gauge algorithm
• Integrated protected lithium-ion charge and discharge system
• On-chip safety-guarding for single-cell to multi-cell pack
• On-chip EPROM-based secure access system
• High-voltage interface for secure programming
• On-chip temperature measurement and protection
• Integrated wake-up controller
• Wide operating temperature range
• Power-management-focused Reg-Stop mode

Application Field and Working Principle

The BQ34Z651DBT is ideal for a wide range of Li-ion battery-powered applications including medical devices, handheld devices, IoT, robotics, communication equipment, industrial equipment and automotive data loggers. It is built upon Maxim Integrated’s patented Impedance Track™ algorithms, and offers robust battery performance with an accuracy of +/-2% capacity. The BQ34Z651DBT is a regulated charge controller for single-cell to 18-cell battery packs, and a regulated discharge controller for up to 6-cell packs. It also contains an in-built safety circuit for open- and short-circuit protection, and overcharge, over-discharge, and over-temperature protection as well. When the pack voltage rises above the safe level, the charge controller will shut down the charging of the battery.

The BQ34Z651DBT Gas Gauge IC also features an EPROM-based secure access system, with user-programmable secure keys, to prevent tampering with the IC and Safeguard high-value content. Furthermore, it includes an on-chip wake-up controller, which allows the system to reduce the BQ34Z651DBT power consumption in its inactive states. The device also includes a power-management-focused Reg-Stop mode, where the MCU can down-regulate to reduce the device power consumption while still maintaining the accuracy of the fuel gauge’s measurements.

Conclusion

The BQ34Z651DBT is a highly versatile battery fuel gauge with built-in safety and dynamic power management capabilities. Its various features make it ideal for a wide range of Li-ion battery-powered applications, including medical devices, handheld devices, IoT, robotics, communication equipment, industrial equipment, and automotive data loggers. Its patented Impedance Track™ algorithms enable robust battery performance with a capacity accuracy of +/-2%, and its on-chip safety and secure access systems helps protect the IC from tampering and safeguard high-value content.

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