RT9715HGB

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PMIC (Power Management Integrated Circuit) is a broad topic and includes a large variety of semiconductor devices. Among them are Power Distribution Switches, Load Drivers and also the RT9715HGB, a load switch and a load driver. The RT9715HGB is a single-channel low-side power switch utilized to control the current flow in between two terminals and provide protection against short-circuit and current overload. This article will discuss the application fields and working principles of the RT9715HGB.

Application Field

The RT9715HGB is widely used in lithium battery powered products. It ensures that high-side current flows in and out of the battery, driving either a load device or a VME/VMF (High-side MOSFET) device. It is also used in mobile devices, such as smartphones and tablets, for controlling the current provided to the display and other system components, like cameras, processors and radios.

Other applications include motor drivers, switch-mode power supplies, UPS systems, industrial power supply systems and renewable energy projects.

Working Principle

The RT9715HGB has two terminals – the low side (source) and the high side (load). It works as a double-element load switch, connecting the two terminals to each other when required and isolating them at other times. The two terminals are connected and isolated by means of a P-channel MOSFET and a load switch.

The device consists of an input voltage VIN, a load voltage VOUT, a P-channel MOSFET and a load switch. When the device is enabled, the P-channel MOSFET allows for current to flow from the source to the load. When the device is disabled, the load switch disconnects the source and the load, therefore isolating them. The RT9715HGB can also be used as a load driver – when enabled, the device drives the load to the VOUT voltage.

The RT9715HGB has several protection features, such as over-voltage, over-current and reverse current protection. It also includes ESD protection, thermal shutdown and adjustable current limiting. The device provides audible output to indicate its operation status. The RT9715HGB is commonly used in a single cell lithium-ion power system, where it ensures the safe connection and disconnection of batteries to the system.

Conclusion

The RT9715HGB is a single-channel low-side power switch and load driver, widely used in lithium battery powered products and mobile devices. It operates as a double-element load switch, connecting and disconnecting the two terminals while providing over-voltage, over-current, ESD, thermal protection and adjustable current limiting. The RT9715HGB is an important part of any lithium-ion power system.

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