RT8159GS

Series:	*
Part Status:	Last Time Buy

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The RT8159GS is a DC/DC buck switching controller suitable for applications that require high efficiency, low standby power and small size. The integrated active clampd MOSFET technology and improved output charging features enable high-performance and fast transient response for demanding applications. The RT8159GS operates in synchronous mode and can provide a regulated output voltage at either 0.6V or 1.0V when an external sense resistor is used. The controller incorporates an adjustable frequency oscillator, a regulated constant frequency pulse width modulator, and a high-efficiency sinking output stage. The operating frequency of the RT8159GS can be externally programmed over a wide frequency range of 300kHz to 1.5MHz. To reduce external components and size, the RT8159GS offers a low voltage regulation loop, soft-start, over current protection, and accurate enable function. The RT8159GS also has the ability to incorporate an external resistor to adjust the reference threshold voltage, which can help reduce the output voltage ripple and system noise.

Applications

• Power supply solutions for high-power data storage systems
• Multiple output power supply (POE) for industrial controls
• Processor core supplies for handheld applications
• Battery powered applications for mobile phones, laptop PCs and tablets
• Permanent Magnet Synchronous Motor (PMSM) applications
• Point-of-load (POL) voltage regulator.

Working Principle

The RT8159GS operates in synchronous mode and uses an external MOSFET to regulate the output voltage. The controller operates by switching the MOSFET at a fixed frequency determined by the RT8159GS oscillator. The output voltage of the controller is controlled by varying the duty cycle of the pulse width modulation (PWM) signal. The internal voltage regulator loop of the RT8159GS continuously compares the output voltage with an internal reference voltage and adjusts the duty cycle accordingly.To protect the output from various adverse conditions, the RT8159GS features adjustable soft-start and over-current protection, as well as accurate enable function. The RT8159GS also provides a low-voltage-regulation (LVR) loop, which can be configured to detect an output voltage drop that is below a fixed threshold or the threshold value can be adjusted externally.The integrated active clamp transistor technology of the RT8159GS increases efficiency and reduces the switching losses of the external MOSFET. The active clamp also significantly reduces the reverse recovery losses of the external MOSFET and also allows for a soft switching of the MOSFET to reduce EMI.The RT8159GS also features an adjustable frequency oscillator, which allows the user to program the switching frequency from 300kHz to 1.5MHz externally. This adjustable frequency allows the user to optimize efficiency for a specific load current or output voltage.To ensure stable operation of the controller and output protection of the load, the RT8159GS provides a sense resistor and an output voltage feedback loop. This feedback loop is used to monitor the output voltage and adjust the duty cycle of the PWM pulse accordingly.In summary, the RT8159GS is a high-efficiency switching controller that is suitable for applications that require low standby power and small size. The device operates in synchronous mode, featuring integrated active clamp and adjustable frequency oscillator, a regulated constant frequency pulse width modulator and a high-efficiency sinking output stage. The RT8159GS also offers adjustable soft-start and over-current protection, as well as an adjustable reference threshold voltage to reduce output voltage ripple and system noise. The RT8159GS is ideal for powering high-power data storage systems, multiple output power supply (POE) for industrial controls, and processor core supplies for handheld applications.

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