RT2855AHGQW

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The RT2855AHGQW is an integrated DC DC switching regulator specifically designed for mobile power management applications. It integrates high-speed N-MOSFET and low RDS(ON) synchronous rectifier to keep the minimal conduction loss in light load condition. The RT2855AHGQW is compacted with high efficiency up to 95%, low quiescent current up to 143μA, low EMI noise and a fast transient response.

The RT2855AHGQW also provides excellent power integrity, such as low output voltage ripple, low output voltage deviation and current regulation. It also uses logic level undervoltage lockouts(UVLO) function to prevent device damage due to input voltage detect and has a power good(PGOOD) pin. All these features make the RT2855AHGQW the ideal choice for mobile power management applications.

Application Field

The RT2855AHGQW is optimized for mobile power management applications, such as smart phones and other hand-held devices. It can work with various power section for different voltage/current applications. It also supports different power stages such as low dropout mode and low input voltage, which is ideal for battery powered mobile devices.

The RT2855AHGQW can be applied in various scenarios, including:

• Smart phone batteries
• Tablet computers
• Notebook computers
• Cameras and other portable electronic devices

Working Principle

The RT2855AHGQW utilizes a DC DC buck converter topology. The converter consists of a high side MOSFET, a low side MOSFET, an inductor, a diode, and a load capacitance. The inductor acts as a current repository and will pass the current from the input source to the output during the ‘on-time’ of the converter, and store the current in the capacitor. When the converter is turned off, the capacitor will then discharge to the load.

The converter works in three different stages, namely the start-up, normal mode and shutdown. The start-up stage involves charging up the output capacitance and supplying current to the load, while the normal mode involves the cycle of switching the MOSFETs to output the desired current. The shutdown stage is responsible for disabling the converter, hence reducing the power consumption.

The RT2855AHGQW utilizes a peak current mode control with a hysteretic power efficiency. This control method simplifies the circuit design, which decreases the complexity of the design and enhances the reliability of the device. It also ensures a fast load transient response, which is critical for charging batteries.

The RT2855AHGQW also utilizes a pulse-width modulation (PWM) to modulate the output current. The PWM is used to control the duty cycle of the MOSFETs, which will then regulate the output voltage and current. The voltage and current are then regulated using a feedback loop. The feedback loop utilizes a resistor-divider network to sense the output voltage and adjusts the duty cycle accordingly.

In addition, the RT2855AHGQW also has an adjustable frequency that allows the user to set the switching frequency of the converter. This adjustable frequency can be used to optimize the converter under different load conditions.

The RT2855AHGQW is an ideal choice for mobile power management applications. Its high efficiency, low quiescent current, low EMI noise, fast transient response and excellent power integrity make it the perfect solution for keeping your device powered.

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