RT2856GQW Integrated Circuits (ICs)

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RT2856GQW Application Field and Working Principle

The RT2856GQW is a DC/DC switching regulator controller developed by Richtek. It is included in the PMIC category of voltage regulators, and its DC/DC switching regulator application provides high efficiency with low power dissipation.

Application

The RT2856GQW is typically used in equipment with low-power circuitry, such as hand-held and battery-powered systems. Its integrated hysteretic control loop allows for fast transient response, which helps reduce performance-degrading start-up time.

Richtek developed the IC to increase efficiency and reduce standby power dissipation. The integrated phase-lock loop (PLL) helps minimize noise injection from external sources and the low-current power-up circuit prevents current spikes from damaging the IC.

Key Features

This chip boasts a few key features that helps set it apart from similar products on the market.

• Internal high-voltage start-up regulator
• Hysteretic control loop
• Proprietary process technology
• 2.5MHz operation
• Current-mode control circuit
• Low shutdown current

Working Principle

The RT2856GQW uses a hysteretic control loop to provide fast transient response. The current mode architecture delivers high-performance power conversion with auto-detection of start/stop conditions.

The device senses the output voltage and modulates the power switch duty cycle in an attempt to maintain a near constant output voltage. The current-mode circuit enforces a peak current limit that helps protect against overload conditions, and it also provides feedback to the error-amplifier to enable smooth and efficient control.

The internal high-voltage starts up regulator supplies power to the control block. An extendable programmable frequency setting allows the device to be set to any frequency between 1.25 and 2.5MHz, and the PLL reduces noise injection from external sources.

The RT2856GQW incorporates a low-efficiency shutdown circuit that reduces the IC\'s supply current to a virtual zero level and allows consumer equipment to meet current Energy Star requirements.

Conclusion

The RT2856GQW DC/DC switching regulator controller is an efficient and powerful solution for applications with low-power circuitry. Its hysteretic control loop, proprietary process technology, and current-mode control circuit help provide high performance and energy savings. The device is ideal for consumer electronics, such as hand-held and battery-powered systems, that require fast transient response and long battery life.

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