RT9258GQW

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RT9258GQW Application Field and Working Principle

The RT9258GQW is a step-down DC/DC switching controller from Richtek Technology Corporation. It is incorporated in a Power Management IC (PMIC) type of Voltage Regulators, specifically in a DC-DC Switching Controllers category. This high performance device is designed for low cost and high efficiency to meet the power requirements of applications such as LCD TVs, set-top boxes, gaming consoles, and other host systems with limited power consumption.

Based on a high dense, CMOS process, the RT9258GQW operates at a frequency of 375KHz, which is above the audible range and therefore, the switching noise will not interfere with the noise in other parts of the circuit. This controller includes an accurate reference voltage, a PWM Comparator, an Error Amplifier, an Over Temp Protection (OTP) circuit, a 4-bit Digital Over-Voltage Proteciton (DVPOT) circuit, as well as other useful protection features for optimal performance.

Features

• Built in high precision voltage reference, reference voltage can be adjusted with external resistors.
• Supports PWM/PFM mode.
• OVP, UVP, SCP, OVPOT and UVPOT protection circuit.
• Over current, over temperature, and other protection functions.
• An accurate power-on reset circuit.
• Excellent lineage and wide supply voltage range.

Working Principle

The RT9258GQW is a buck converter controller, which means it is a DC-DC converter that steps-down the voltage from its input to the desired output. This controller works by modulated switching of the collector current of a power transistor, also called a “switching transistor”, connected to the output of the converter. The collector current is modulated through a pulse-width modulation technique which is controlled by the voltage reference inside the controller. The controller is then able to control the current and output voltage of the converter by adjusting the width of the output pulses.

The RT9258GQW has a 4-bit Digital Over-Voltage Protection (DVPOT) circuit, which closes the loop around the error amplifier and acts as an auto-balancing voltage assistant to the output voltage. It also has built-in Over-Voltage Protection (OVP) and Under-Voltage Protection (UVP) functions which protect the system from any input voltage fluctuations by controlling the voltage output. The controller also includes an accurate power-on reset circuit, which prevents any over-current events from occurring during start-up.

In addition, the RT9258GQW has an excellent line regulation, meaning the output voltage will remain constant even when the input voltage is varying. It has a wide operational supply voltage range, which allows for the device to be used in a variety of different applications. It also provides short circuit over temperature protection and is able to operate at an efficient efficiency rate.

Applications

• LCD TVs
• Set-top boxes
• Gaming consoles
• Server systems
• Network devices
• Home appliances
• Power Management IC

The RT9258GQW is an ideal power supply solution for applications that require a high performance step-down DC-DC converter. It is capable of providing excellent regulation and high efficiency while also providing protection features that make it more suitable for multiple types of applications.

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