RT8068AZQW Integrated Circuits (ICs)

Voltage - Input (Max):	5.5V
Supplier Device Package:	10-WDFN (3x3)
Package / Case:	10-WFDFN Exposed Pad
Mounting Type:	Surface Mount
Operating Temperature:	-40°C ~ 85°C (TA)
Synchronous Rectifier:	Yes
Frequency - Switching:	1MHz
Current - Output:	3A
Voltage - Output (Max):	5.5V
Voltage - Output (Min/Fixed):	0.6V
Series:	--
Voltage - Input (Min):	2.7V
Number of Outputs:	1
Output Type:	Adjustable
Topology:	Buck
Output Configuration:	Positive
Function:	Step-Down
Part Status:	Active
Packaging:	Tape & Reel (TR)

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Introduction

The RT8068AZQW is a high efficiency synchronous step-down DC/DC voltage regulator, integrated with both VIN high-side and low-side MOSFETs. It is manufactured by Richtek and comes in a tiny 4-pin MLPQ package measuring at only 2mm x 2mm allowing it to be used in space constrained applications. The RT8068AZQW provides up to 5.25V of output voltage, up to 800mA of output current, and an adjustable operating frequency, making it an ideal choice for a variety of battery-powered DC/DC applications. It is an energy efficient solution, featuring a 2.2V to 6V wide input voltage range, an adjustable switching frequency from 350kHz to 2.2MHz, and up to 96% peak efficiency across all conditions.

Application Field of RT8068AZQW

The RT8068AZQW is a highly integrated and energy efficient device that is suitable for use in many applications. It provides a reliable and robust solution for powering a wide range of circuits and products, including portable devices and consumer electronics. Examples of applications include, but are not limited to, Li-ion battery chargers, audio amplifiers, Bluetooth/GPS modules, PDAs and cell phones. This device can also be used as a bypass/kickstarter switch in automotive power systems or as a DC/DC step-down voltage regulator for automotive lighting systems.

Working Principle of RT8068AZQW

The RT8068AZQW operates on the buck-topology principle, in which it steps-down the input voltage from VIN to the regulated output voltage VOUT. The device incorporates a PWM-controlled high and low side MOSFET switch pair whose state is controlled by an internal PWM comparator that compares the voltage between VOUT and the internal reference voltage (V_REF).When the output voltage is under the threshold, the high side MOSFET will turn on and the low side MOSFET will remain off, connecting the input voltage to VOUT. When the output voltage has exceeded the threshold voltage, the internal PWM comparator will turn off the high side MOSFET and turn on the low side MOSFET, thus cutting off the connection between VIN and VOUT and charging the inductor until the output voltage is at the desired threshold level.The RT8068AZQW also incorporates several additional features to improve the switching performance. This includes an external compensation pin for controlling the loop gain and transient response, as well as an output voltage soft start pin that helps to reduce the inrush current at the beginning of the start up process.

Conclusion

The RT8068AZQW is an energy efficient and highly integrated DC/DC regulator ideal for use in battery-powered applications such as Li-ion battery chargers, audio amplifiers and Bluetooth/GPS modules. The device operates on the buck-topology principle and features a wide input voltage range, adjustable switching frequency and excellent output voltage regulation. The device also incorporates additional features such as external compensation and soft start pins that help to improve switching performance.All in all, the RT8068AZQW is an excellent choice for powering battery-powered circuits and products.

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