RT8288AZSP Integrated Circuits (ICs)

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PMIC - Voltage Regulators - DC DC Switching Regulators

Introduction

The RT8288AZSP is a High Efficiency synchronous step down DC-DC converter. It is a high performance power management IC (PMIC) with an integrated switching MOSFET. It is available in a 7-pin 2.5mm x 3.2mm QFN package with very low profile and high efficiency.The RT8288AZSP is suitable for a variety of applications such as cellular phones, PDAs, portable media players, digital still cameras, GPS, set top boxes, PDAs and battery powered devices.This application note outlines the features and applications of the RT8288AZSP and explains the working principle of the device and how to use it in various applications.

Features

The RT8288AZSP has the following features:

• High Efficiency synchronous PWM step-down DC/DC converter
• High Power Density
• High Current Capability
• Internal Low RDS(ON) N-Channel MOSFET
• Built-in Compensation Network
• Soft-Start and Enable Input
• Over-Current Protection, Over-Temperature Protection, Under-Voltage Lockout
• Operating Range: 2.5V to 18V, Output Voltage Range: 0.8V to 12V
• Available in 7-pin 2.5mm x 3.2mm QFN package

Applications

The RT8288AZSP DC/DC converter is suitable for a variety of portable and battery powered applications, including but not limited to:

• Cellular Phones
• PDAs
• Portable Media Players
• Digital Still Cameras
• GPS
• Set Top Boxes
• PDAs
• Battery Powered Devices

Working Principle

The RT8288AZSP is a high efficient synchronous PWM step-down DC/DC converter. It integrates an internal N-channel MOSFET as the high-side switch, and an external P-channel MOSFET as the low-side switch.The core of the device is a voltage mode PWM controller that monitors the output voltage and generates a PWM signal accordingly.The PWM signal is then used to control the internal N-channel MOSFET and external P-channel MOSFET to regulate the output voltage.The RT8288AZSP also features over-current protection and thermal shutdown to protect the device from damage.The device also has a built-in soft-start circuit that allows the device to ramp up slowly on startup, thus avoiding any inrush current and reducing the stress on the input supply.The enable input allows the device to be turned ON and OFF without cycling the input supply.The RT8288AZSP is best suited for applications where the output voltage is in the range of 0.8V to 12V, and where high power density and high efficiency are required.

Conclusion

The RT8288AZSP is a high efficiency synchronous PWM step-down DC/DC converter. It integrates an internal N-channel MOSFET as the high-side switch, and an external P-channel MOSFET as the low-side switch.The device is ideal for applications where the output voltage is in the range from 0.8V to 12V, and where high efficiency and high power density are required.The device also has several protection features such as over-current protection, over-temperature protection and under-voltage lockout, as well as an enable input and a soft-start circuit to reduce the inrush current on startup.The RT8288AZSP is a convenient and efficient solution for power management in portable applications.

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