RT9709GQWB

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With the development of smart phones and rapid expansion of the battery field, the need for battery managements such as the RT9709GQWB has arisen. Here we will discuss the application field and workings principle of the RT9709GQWB, a linear battery charger from Richtek Technology Corporation.The RT9709GQWB is a linear battery charger with extremely low power consumption designed for low-power applications. It is designed for use in battery systems ranging from a single battery cell to over 20 cells. It has a wide voltage input range from 4V to 20V, supporting most batteries and also works with a wide variety of battery chemistries like Li-Polymer, LiFePO4 and more. The RT9709GQWB includes an onboard power sense FET and a synchronous PWM buck converter to regulate the output voltage in order to maximize the charging rate. The device also includes a maximum power point tracking (MPPT) algorithm, allowing the charger to provide a stable charging current even when the input voltage varies. The charger also supports USB-PD (power delivery) and USB-C or Lightning cables for fast charging. The charger employs high-efficiency switching circuitry to provide a high power conversion efficiency up to 95% and a low standby current of up to 20μA. The low quiescent current and low power consumption reduce battery usage and extend battery life. It also includes a programmable charge current and voltage, as well as programmable termination and recharging thresholds, allowing for optimized battery charging. The RT9709GQWB also includes thermal, short-circuit, and over-current protection to further ensure the safe and reliable charging of the battery. For additional safety, the charger employs over-voltage protection and reverse current protection to prevent overcharging and discharging of the battery. In summary, the RT9709GQWB is an efficient, safe and reliable linear battery charger capable of charging a wide range of battery systems from a single battery cell up to 20 cells. Its low power consumption and high efficiency charging make it a perfect choice for low-power applications. With its programmable charge current and voltage, as well as its integrated thermal, short-circuit and over-current protection, the RT9709GQWB is a great choice for battery management.

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