RT8070ZQW Integrated Circuits (ICs)

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The RT8070ZQW is a DC-DC switching regulator that utilizes a long-term stable current-mode control and frequency jittering mechanism to achieve efficient and low-noise operation. This device is a simple and reliable way to achieve high quality power regulation and it is well suited for demanding applications such as storage and networking.

The RT8070ZQW includes a unique multiple control-method control algorithm which can limit the output noise level during dynamic loads, and keep the output voltage at very low ripple. It is a high precision and low noise regulator for both local and global power management applications.

The RT8070ZQW is available with a wide range of output voltages, from 0.8V to 5.5V. The device is able to provide power up to 15A with a wide input voltage range (4.5-23V). In addition, to ensure stability, it also features an over-temperature protection and a programmable soft-start.

The typical application field of the RT8070ZQW is in embedded systems, storage and networking, and automotive.

Working Principle

The RT8070ZQW adopts a current-mode control scheme with a phase-shift regulation loop, which simplifies the design of output voltage. The device is implemented with a low-side P-channel MOSFET and a high-side N-channel MOSFET. The low side switch is driven directly by the controller via an internal high-speed driver. An input voltage is rectified and then delivered to the inductor. When the inductor current reaches the programmed minimum current limit threshold, the device will switch to the P-channel MOSFET to discharge the inductor current. The inductor current regulation loop of the RT8070ZQW is controlled by an external compensation circuit. The phase-shift regulation loop is used to control the accurate output voltage.

Modes of Operation

The RT8070ZQW provides two modes of operations: continuous conduction mode (CCM) and discontinuous conduction mode (DCM). CCM is used when the load current is greater than the minimum current limit (Ihold), and the inductor current will keep on flowing through each cycle of the switching period. In DCM, when the load current is lower than the minimum current limit (Ihold), the P-channel MOSFET turns off after discharging the inductor current completely.

When the duty-cycle ratio is small and the inductor current is less than the minimum current limit (Ihold), the inductor current would only flow through part of the switching cycle and the rest of the current will be taken by the resistor connected in parallel with the inductor. The VOUT is a function of duty-cycle and resonator frequency, which can be seen as an alternating average. Thus, a precise frequency control is needed to get a precise output voltage.

Conclusion

The RT8070ZQW is a high quality DC-DC step-down regulator that features high precision, low noise, wide input voltage range, multiple control-mode control and frequency jittering mechanism. It is an effective and reliable way to achieve high quality power regulation and it is well suited for demanding applications such as storage and networking. The typical application field of the RT8070ZQW is in embedded systems, storage and networking, and automotive.

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