RT8101AGS Integrated Circuits (ICs)

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RT8101AGS is a non-synchronous tracking and regulated switching controller designed to provide power supply design engineers with the required number of outputs and significant advanced features including high efficiency and low external component count. It is part of a series of ultra-low-power, high-performance products developed by Richtek Technology Company, which focuses on programmable power management. The RT8101AGS series is designed to provide high levels of performance while delivering low-power consumption with a wide range of control and flexibility.

Application Field

RT8101AGS is suitable for a variety of applications. It is especially useful in mobile devices and systems, such as cellular phones, digital cameras, notebook computers, and embedded systems, for charging batteries and providing multiple power outputs for low power and high load operation. It is also applicable in LED lighting management, portable media players, and other equipment for power management.

RT8101AGS is a multi-output regulator with a single-phase control and offers a cascade-type design to improve the overall output power conversion efficiency. It is capable of up to 92% conversion efficiency, while supplying up to 4.5 amperes of output current. To accommodate driving various types of loads, the device features an adjustable regulated and switching output voltage range of 0.8V to 5.25V in 0.1V increments, and programmable soft-start and current limit levels.

Working Principle

RT8101AGS is based on the pulse width modulation (PWM) control technique, which utilizes the optimization of off time and/or on time of the switching device inside the device. In this type of control, the device changes between two states, either on or off, at a steady frequency to achieve the desired output voltage. The slope compensation technique is employed to maintain a stable output. The RT8101AGS utilizes a constant ON-time current mode to drive an internal MOSFET during the ON period of the device.

RT8101AGS also employs an input power muting (IPM) technique to extend battery/supercap discharge time. IPM allows the device to automatically detect when the input power drops below a preset threshold and reduce ripple voltage. The ability to reduce the MOSFET switching frequency also reduces heating of the component and extends its life.

RT8101AGS can deliver output currents up to 4.5 A while operating with peak currents up to 13 A. Automatic power saving mode is used to reduce its power consumption. The complete system consumes less than 350 mW at light loading, which is ideal for battery-operated systems.

The RT8101AGS utilizes a unique voltage folding feature which minimizes the amount of external components needed. This feature enables the device to achieve an output voltage more accurately than the usual method of increasing voltage with a voltage divider. It provides an output voltage of 0.8 V to 5.25 V, with a resolution of 0.1V.

The device also features an onboard trimming system. This enables the user to precisely adjust the output voltage with ease using only one external resistor. With this onboard trimming system, the user can simply adjust the output voltage of the RT8101AGS without having to modify the circuit or even open the housing of the device.

In addition, the RT8101AGS is equipped with safety features such as thermal protection, input undervoltage lockout, internal current limit, over voltage protection and current-sensing pin to protect the load and the device from damage. The device also has a short circuit protection.

Conclusion

The RT8101AGS series of switching controllers from Richtek Technology Company offers enhanced flexibility and performance for power supply design engineers. It offers a wide range of features and benefits, including high efficiency, low power consumption, and low external component count. It is suitable for a variety of applications, and is particularly useful in mobile devices and systems, such as cellular phones, digital cameras, notebook computers, and embedded systems. It is also applicable in LED lighting management, portable media players, and other equipment for power management.

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