RT8011AGQW

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The RT8011AGQW is an integrated DC-DC buck converter controller designed to deliver high performance as well as strong protection features while featuring small size and low power consumption. The availability of an I2C/SMBus interface makes the device suitable for a wide range of applications such as powering MCUs, ASICs, FPGAs, and other ICs.

Application Field

The key features of the RT8011AGQW make it suitable for applications such as:

• Powering microcontrollers, ASICs, FPGAs, and other ICs
• Routers and switches
• PDAs and PDAs
• Wireless communications
• Battery powered devices
• Portable media players
• Printers, scanners and fax machines
• Mobile phones
• Personal digital assistants
• Industrial control systems and medical equipment
• Set-top boxes

Working Principle

The RT8011AGQW is an integrated voltage regulator controller. It works as a buck regulator, with external transistors included in the controller’s circuitry. The device uses an internal modulator to adjust its output voltage, with an output voltage range from 0.8V to 5.5V, that can be adjusted through the I2C/SMBus interface. The controller also features short-circuit protection, under-voltage protection, thermal protection, and power-on reset.

The regulator\'s output voltage is determined by the voltage on the feedback voltage pin. The voltage peak of the high-side MOSFET is equal to Feedback Voltage + Vdrop. If the internal modulator detects that the output voltage has dropped too low, it will reduce the duty cycle of the high-side MOSFET so as to recover the output voltage. If the output voltage is higher than the desired threshold, the modulator will increase the duty cycle of the high-side MOSFET until the voltage is restored to its set point.

In addition, the RT8011AGQW includes a power-on reset circuit composed of an internal reset timer and an external resistor divider. This circuit allows the RT8011AGQW to provide a controlled start-up of the power output, with a startup time between 0.2 to 500 ms, in order to avoid overloading the system\'s power line.

The power-save feature of the RT8011AGQW allows the device to switch between two operating states. In the power-save mode, the device draws a low quiescent current (typically 5uA) and reduces the power consumption of the system. The device can also be configured to remain in the power-saving mode during system deep idle or light loads.

Conclusion

The RT8011AGQW is an integrated DC-DC buck converter controller designed to enable high performance and strong protection features while featuring small size and low power consumption. The availability of an I2C/SMBus interface makes the device suitable for a wide range of applications such as powering MCUs, ASICs, FPGAs, and other ICs. The device’s features include adjustable output voltage range, short-circuit protection, under-voltage protection, thermal protection, power-on reset and power-save mode.

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