BQ76925PW

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Power management IC (PMIC) helps in optimizing battery performance and conservation by reducing the load current and managing charging. BQ76925PW is a battery management IC specifically designed for two and three-cell series lithium ion (Li-ion) and lithium iron phosphate (LiFePO4) battery packs. This PMIC utilizes a state of charge (SOC) algorithm and direct current (DC) voltage feedback to detect pack voltage, temperature, and other critical faults. It monitors and provides direct current output control to a programmable load and/or charger. Additionally, it performs various other functions, such as over current, under voltage (UVP), over voltage (OVP) protection, and under voltage protection (UVP), over temperature protection (OTP) and cell-balancing.

BQ76925 requires minimal external components; typically just sense resistors, a few low-value capacitors and input power supplies. It is available in a few different packages, including 4.4 x 4.4 mm and 4.4 x 5.9 mm, and has an operating temperature range from -40°C to +85°C.

The BQ76925PW application field and working principle is described in this section. The device is mainly used for two and three-cell series lithium ion (Li-ion) and lithium iron phosphate (LiFePO4) battery packs as a power manager. The working principle is based on SOC algorithm and direct current (DC) voltage feedback for monitoring and control of direct current (DC) output for charging and/or loads.

The main functions of BQ76925PW include monitoring of pack voltage, temperature and other critical faults. It offers over current, under voltage (UVP), over voltage (OVP) protection, and under voltage protection (UVP), over temperature protection (OTP) and cell-balancing. These multiple protection/safety mechanisms make the device a good choice in power management applications. Additionally, the BQ76925PW supports an adjustable threshold where the average of cell voltage levels can be set so that the equalization circuit is enabled at a certain time.

The BQ76925PW is designed for both two and three-cell series Li-ion and LiFePO4 battery packs. It consists of a high-side current-sense amplifier, a voltage reference, A/D converters and a 8051-based microcontroller. The device implements an advanced SOC algorithm with direct current (DC) voltage feedback in order to detect pack voltage, temperature and other critical faults. It is also capable of providing direct current output control to a programmable load and/or charger.

The BQ76925PW has two major components, the charging controller and the load controller. The charging controller is responsible for monitoring and controlling the voltage and current for charging the battery packs. It also performs under voltage protection (UVP), over voltage protection (OVP) and over temperature protection (OTP) for avoiding damage to Li-ion and LiFePO4 batteries. Additionally, the charging controller is able to detect cell imbalance situations and initiate a cell balancing process to ensure the safety of the battery packs.

The load controller is responsible for monitoring the load current and output voltage for the programmable load and/or charger. It is also capable of detecting an over current, under voltage (UVP) and over voltage (OVP) depending on user settings. Additionally, the load controller has fault detection and reporting capabilities, which enable it to detect various conditions and alert the user in case of any problems.

In conclusion, the BQ76925PW is a Battery Management IC specifically designed for two and three-cell series Li-ion and LiFePO4 battery packs. It implements a state of charge (SOC) algorithm and direct current (DC) voltage feedback to detect pack voltage, temperature and other key faults. Additionally, it provides direct current output control to programmable loads, and performs over current, under voltage (UVP), over voltage (OVP) protection, and under voltage protection (UVP), over temperature protection (OTP) and cell-balancing.

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