MIC39101-1.8BM

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Introduction

The MIC39101-1.8BM is a low-dropout (LDO) linear voltage regulator for use in point-of-load (POL) applications, offering a wide input voltage range and very low quiescent current. It enables power system designers to develop a range of highly efficient, cost-effective, and low-power application designs, such as computing, telecommunications, automotive, and industrial. This paper will present the application field and working principle of the MIC39101-1.8BM linear voltage regulator.

Features and Benefits

The MIC39101-1.8BM is a highly reliable LDO linear voltage regulator with a wide input voltage range, very low quiescent current, and very low dropout voltage. Its features and benefits include:

• Wide input voltage range of 2.5V to 32V.
• Output voltage accuracy of 5%.
• Maximum dropout voltage of 0.2V.
• Industry-leading quiescent current of 0.8mA at no load.
• Industry-leading transient response of 128mV/μs.
• Temperature range from -40°C to +125°C.
• High reliability of 1 in 10 billion failure rate.

Applications

The MIC39101-1.8BM linear voltage regulator is ideally suited for a variety of POL applications, including:

• Computing – chip sets, graphic cards, and motherboards.
• Telecommunications – basestation, DSL modems, set-top boxes, and VoIP phones.
• Industrial – HVAC systems, motor controls, renewable energy sources, and industrial connectivity.
• Automotive – vehicle electronics, powertrain controllers, and body electronics.

Working Principle

The MIC39101-1.8BM linear voltage regulator utilizes a two-stage design, consisting of an operational amplifier (op-amp) and a N-channel MOSFET as the regulating element. The op-amp serves as the error amplifier to compare the output voltage to a reference voltage. If the output voltage is too high, the op-amp triggers the negative voltage at the gate of the MOSFET, thereby reducing the load current until the output voltage is within specification. Conversely, if the output voltage is too low, the op-amp triggers the positive voltage at the gate of the MOSFET, thereby increasing the load current until the output voltage is within specification.

The MIC39101-1.8BM uses a feedback loop that is extremely sensitive to output voltage errors. As a result, the regulator is capable of providing tightly regulated output voltages, even at very low input voltages and high load currents. In addition, its low dropout voltage ensures that the regulator maintains a high level of efficiency, even at very low input voltages.

Conclusion

The MIC39101-1.8BM linear voltage regulator is a highly reliable device with a wide input voltage range, very low quiescent current, and very low dropout voltage. It is ideally suited for a variety of POL applications in the computing, telecommunications, industrial, and automotive sectors. The two-stage design, consisting of an op-amp and a regulating MOSFET, ensures fast and accurate output voltage regulation, even at very low input voltages and high load currents.

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