XR76208EL-F Application Field and Working Principle

Introduction

The XR76208EL-F is a synchronous buck regulator DC-DC Controller from Integrated Device Technology, Inc. (IDT). It is part of the Synchronous Buck Regulators portfolio. This particular device has a wide range of applications for efficient DC power management. It is suitable for driving moderately high current loads that require high power delivery in a very small package. This paper will discuss the application field and operational principle of the XR76208EL-F.

Application Field

The XR76208EL-F from IDT is a precise current mode control synchronous buck regulator with integrated control and drive components. It features an excellent transient response and high efficiency, making it suitable for a wide range of applications. It is especially suitable for providing intermediate voltages between mobile processor cores, VDDQ, and other lower power integrated components. This device is capable of providing 0.8A to 4A of continuous output current while still maintaining high operating efficiency. Additionally, the output voltage can be set up to 0.8V with adjustable 100mV resolution.

The XR76208EL-F is available in both a TSSOP24 and QFN packages, depending on the requirements of the application. The device is capable of providing up to 4A of continuous output current at 1.2V which is suitable for powering peripherals such as communications devices and Power over Ethernet (PoE). It is also suitable for driving high-power LEDs and other applications that require a precise output voltage and current.

Working Principle

The XR76208EL-F synchronous buck regulator is based on current mode control (CMC). This type of control topology provides fast and stable operation across a wide range of input and output voltages. In addition, CMC helps to reduce EMI, reduce switching losses, and improve power efficiency. The device’s control circuitry consists of an internal reference voltage source, a control loop, and a PWM comparator. The output power is regulated through an integrated, high-speed switch. When the output voltage rises above the set point, the comparator opens the power switch and ceases the current flow until the voltage again falls below the set point. The integrated comparator and voltage reference allows for precise control of the output power.

The XR76208EL-F also features a low-noise, low-dropout linear regulator (LDO) linear regulator, which powers the gate drive circuitry of the MOSFET. This helps to improve power efficiency further by reducing the gate resistance of the MOSFET. Additionally, the device features external compensation, integrated soft-start and overcurrent protection.

Conclusion

The XR76208EL-F DC-DC Controller from IDT is a great choice for applications that require controlled voltage and current delivery. By using CMC and a low-noise, low-dropout linear regulator, it is capable of providing very efficient power delivery. Additionally, it has adjustable output voltage, external compensation, and integrated soft-start and overcurrent protection.