RT9731AZQW(2)

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RT9731AZQW chips belong to a family of integrated Circuits from Silicon Mitus, specifically tailored for voltage mode synchronous buck battery charging applications. The RT9731AZQW provides a robust charging algorithm that supports the majority of popular battery chemistries and supports 4.2V, 8.4V and 10.8V Li-ion and Li-polymer batteries. The RT9731AZQW can provide up to 1.5A of charging current, and implements high precision, dedicated voltage and current loop for accurate charging current and voltage control, and temperature regulated charging for qualified safety. In Standby mode, it draws just 80uA of current, allowing low power consumption. The device also incorporates power good pin, power source selection, power enable and external capacitance function to enhance system compatibility, safety and reliability.

The RT9731AZQW is designed around a variable duty cycle PFM control with synchronous rectifier, and its working principle can be simplified into three distinct states, which we\'ll go through in details below.

State 1: Pre-conditioning

This is the state where the device works as a constant current source, supplying constant charge current to the battery until it reaches a Target Voltage as defined by the customer, usually around 4.2V for Li-ion / Li-Po battery. This stage will help eliminate the memory effect on older batteries.

State 2: Constant Voltage

In this stage the device works as a constant voltage source, supplying constant voltage to the battery while simultaneously monitoring the battery\'s voltage and current. As the battery is slowly charged, the device dials back the current gradually. This helps prevents from the overcharging of batteries and extends battery life.

State 3: Positioning

This is the state where the device enters standby mode, where it no longer supplies power to the battery but still monitors the battery voltage and current to make sure it stays within the safety limits. If the conditions are exceeded, the device enters the Pre-conditioning state and starts again.

The RT9731AZQW is widely used in many applications, due to its advanced technology and features. It can be used in portable power source devices, digital cameras, portable media players, power banks, battery chargers, laptop computers and many other portable devices.

In conclusion, the RT9731AZQW is a reliable and efficient integrated Circuit that provides an accurate control of voltage and current while charging, with features such as power good pin, power source selection, power enable and external capacitance while supporting different types of batteries. It is versatile and straightforward to use, making it the perfect choice for many power supply or battery charging applications.

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