MIC2184BQS

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MIC2184BQS Application Field and Working Principle

Introduction

The MIC2184BQS is a low dropout, current mode, DC to DC Step-Down switching controller which is designed for notebook and desktop computer power supplies as well as a variety of applications. Advantages of the MIC2184BQS include a wide input voltage range and protection against any short-circuits occurring in the secondary side. This paper will explain the application field of the MIC2184BQS, the working principle and its features.

Application Field

The MIC2184BQS is an ideal switch mode power supply controller in many applications because of its wide input voltage range. Its load operations over the full-load with low stand-by power consumption and high power efficiency are highly suitable in notebook and desktop computer power supplies.

The MIC2184BQS works with low dropout regulators to drive power supplies up to 20W and can be used in other multiple application applications, such as cable TV, xDSL, and modems, set-top boxes, and medical devices which require a low dropout, high performance, low noise, fast response DC to DC step-down converter. The tightly regulated voltage along with its overload protection features makes it an ideal choice for safety critical systems such as battery-powered and portable devices.

Working Principle

The MIC2184BQS works on a current-mode architecture which provides fast internal current sensing and high-frequency DC-DC switch mode operation. It regulates voltage by pulse-width modulating the output current of the supply based on its sense pin output voltage. It also provides a programmable constant slope compensation which minimizes loop settling time and provides optimal line and dynamic load responses.

When the input voltage exceeds the output voltage by some threshold level, the MIC2184BQS pulses the internal N-channel MOSFET to drive the output voltage to the required level. A wide range of current-mode compensation modes are provided which allow the MIC2184BQS to operate from an ultra-low supply current of 45µA to an ultra-high slew rate of 3A/µs.

Features of the MIC2184BQS

The high efficiency power savings of the MIC2184BQS are due to its innovative combination of feature sets. Features like its 2MHz switching frequency, integrated low dropout linear regulator and N-Channel MOSFET enable DC to DC conversion with minimal losses which results in greater power efficiency. Additional features such as adjustable current limit, low power shut-down, voltage tracking, soft start, and over temperature shut-down complete the feature set.

The MIC2184BQS incorporates an adjustable voltage tracking control with an output voltage slew rate of up to 1.2V/ms. The combination of a high-efficiency internal N-channel MOSFET and an adjustable current limit technique allows the MIC2184BQS to survive any short-circuit conditions which may occur in the secondary side. Also, the device can be configured for either SOI bypass or discrete bypass techniques.

To protect itself against any faults, the MIC2184BQS includes thermal shutdown, enabling it to shut-down and to limit the power loss from various possible fault conditions. Additionally, it offers an adjustable output voltage range, an integrated linear regulator and input voltage up to 36V, which allows it to be used in a variety of applications.

Conclusion

The MIC2184BQS is a low dropout, current mode, DC to DC Step-Down switching controller which is designed for notebook and desktop computer power supplies. It is suitable for a wide variety of applications including cable TV, xDSL, and modems, set-top boxes, and medical devices which require a low dropout, high performance, low noise, fast response DC to DC step-down converter. With features like its adjustable current limit and voltage tracking, low power shut-down, soft start, and over temperature shut-down, it is suitable for the widest range of applications.

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