BQ24072RGTT

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With the increasingly high performance requirements of modern electronic products, power management integrated circuits (PMICs) have become ubiquitous and significantly improve the power performance of electronic products. PMICs include DC/DC converters, chargers, power regulators, and other functions. Among them, the battery charger is a very important component, which can quickly and accurately charge the lithium battery. At present, TI has applied BQ24072RGTT in the field of battery charging, which is a combination of high efficiency and low noise. This article will introduce its application field, working principle and development trend in detail.

BQ24072RGTT is a dedicated lithium - ion and Li-polymer single cell battery charge management IC with all necessary safety protection functions. It has a variety of programmable parameters and can easily meet different battery charging requirements. It is used for charging 3.7V lithium battery with constant current/constant voltage (CC/CV) mode. It has complete over-voltage, over-current, charge current over-current, over-temperature, under-voltage lockout and other protection functions, so as to ensure the safety of battery charging. In addition, compared with the previous MCU, its high level of integration greatly reduces the system cost, and its small size and low power consumption are very suitable for portable electronic products.

The working principle of BQ24072RGTT is simple and intuitive. Under the action of voltage source VBUS, its PMOS switch is turned on. The current will be pulled in through the external inductance and then pass through the integrated loop of the chip. In the integrated loop, there are the current sensing resistor, switch control, voltage feedback circuit and USB communication input control. Among them, the most important is the switch control module and the voltage feedback circuit. The former adjusts the on and off time according to the switching rule, so that the charging current has the set value of constant current (or constant voltage) mode, and the latter realizes the over-voltage protection of battery by comparing the charging voltage with the setting Over Voltage Threshold.

Currently, the application of BQ24072RGTT mainly focuses on small and medium-sized low-power electronic products such as medical equipment, IoT wearables, automotive accessies, etc. In terms of development trend, due to the rapid development of related digital technology, in the future, BQ24072RGTT includes digital functions such as low quiescent current, smart digital constant current/constant voltage, environmental intelligence, digital switch control, etc., which has become a key trend for new product development.

BQ24072RGTT is a power management integrated circuit with good performance and high cost performance. Its application fields and working principles are discussed in detail in this article. In addition, as the digital technology continues to develop, BQ24072RGTT will also be more convenient in use.

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