BQ29400PWR

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Power management integrated circuits (PMICs) come in all shapes and sizes, each designed to serve a specific application with tailored features. The BQ29400PWR is a PMIC IC that is specialized in battery management and can improve the performance of systems operating on lithium-ion and lithium-polymer batteries. This article takes an in-depth look at the BQ29400PWR application field and working principle.

Overview of BQ29400PWR PMIC

BQ29400PWR is designed to help manage and monitor the performance and health of a battery system comprising one or two lithium-ion or lithium-polymer cells and battery packs. The device provides power path management as well as safety control for over-current, over-temperature, and over-voltage. It also monitors the system and reports battery conditions, such as temperature, voltages and current.

The IC is packaged in a 6-by-6 mm QFN (Quad Flip Chip No Lead Frame) package, which is lead-free, halogen-free and RoHS-compliant. With a maximum operating voltage of 5.25 V and a maximum current of 1.5 A, the BQ29400PWR is suitable for a wide range of applications, especially space-constrained designs such as those found in wearable electronics and mobile devices.

Application Fields of BQ29400PWR

The BQ29400PWR features programmable power path management and battery protection, which makes it well suited for use in systems that require reliable and accurate monitoring of battery health and performance. It is ideal for applications such as mobile phones, wearables, IoT (Internet of Things) devices, medical and industrial equipment, military equipment, and portable computing.

The on-chip linear regulation, switching regulation, and charging regulation provide the system with accurate voltage regulation, hence improving the battery lifetime. The BQ29400PWR also features fast switching times, good power conversion efficiency, and reduced shutdown current, making it small, fast, and reliable.

Working Principle of BQ29400PWR

The BQ29400PWR has an integrated power FET, through which the main power is supplied to the system. There is also a power control loop that regulates the output voltage in response to system load. It monitors the system input voltage and adjusts the output voltage accordingly. This ensures that the output remains stable even when there is an increase or decrease in system load.

The integrated power FET is protected against over-current and short-circuiting by the switch current limit protection circuit. It is also protected against excessive heat and over-voltage by the over-temperature protection circuit and the adjustable over-voltage protection circuit. The BQ29400PWR also features an over-discharge protection circuit that ensures the battery pack protected against over-discharging and thus prevents damage to the system components.

The BQ29400PWR also features a configurable battery-charge protection circuit which detects the voltage level of the battery pack and shuts off the charging process if the voltage level is too low or too high. This prevents over-charging or over-discharging of the battery pack, ensuring that it operates safely and efficiently.

The BQ29400PWR monitors the battery system and reports temperature, currents and voltages information, allowing for accurate charging and system control. The built-in 16-bit ADC ensures that the measurements are reported with high accuracy. The device also features an integrated self-protection circuit which limits the current in case of short-circuiting or overloading, hence further increasing the reliability of the system.

Conclusion

The BQ29400PWR is a Battery Management PMIC designed for lithium-ion and lithium-polymer battery systems. The device features an on-chip linear regulation, switch regulation, and charging regulation, as well as a power control loop that dynamically regulates the system voltage in response to the system load. It also features current, voltage and temperature monitoring and reporting, ensuring reliable control and extended battery life. With the integration of power FET protection, over-discharge protection, over-voltage protection, and over-temperature protection, the BQ29400PWR is suitable for applications such as mobile phones, wearables, IoT devices, medical and industrial equipment, military equipment, and portable computing.

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