MIC5235-3.3BM5-TR

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For those designing for power management, selecting the right components is key for a successful build. With many components to choose from, deciphering exactly what a product will do can be confusing. The MIC5235-3.3BM5-TR is a voltage regulator that is part of the voltage regulator linear category of Power Management integrated circuits (PMICs). This article will focus on the application field and working principle of the MIC5235-3.3BM5-TR.

Application Field of the MIC5235-3.3BM5-TR

The MIC5235-3.3BM5-TR is a 3.3V, 1A LDO linear regulator. It features a low quiescent current of 40μA, drop-out voltage of 200mV, output noise of 30μVrms, low temperature coefficient of 10ppm/°C, and a wide input voltage range of 1.7V to 7.0V. The MIC5235-3.3BM5-TR can provide a clean, stable power supply suitable for many low-power applications, including personal electronics and embedded systems.

This device can be used to provide regulated power supplies in audio amplifiers and A/D converters, powering small computer systems, powering sensors and transducers, for battery management systems, and for automotive applications. For automotive applications, the device\'s low quiescent current, high accuracy and robust thermal design make it ideal for battery management in today’s automotive powertrain and body systems.

Working Principle

The voltage regulator linear category of power management integrated circuits (PMICs) uses the combination of resistance and capacitance to maintain a desired output voltage. This category can provide low levels of power and may include power pass-through circuits, voltage inverters, and linear regulators. The most popular member of this PMIC family is the linear regulator. Devices in this family are classified based on the number of output voltage rails they possess and the type of internal topology they use.

The MIC5235-3.3BM5-TR is a monostable linear regulator, meaning it contains just one output voltage rail. It works by comparing the external input voltage against the reference voltage. The difference is then used to drive an output transistor whose collector-emitter voltage then determines the output voltage of the regulator. This output voltage is controlled and held constant by adjusting the reference voltage to the required value.

At the heart of the MIC5235-3.3BM5-TR is a DC-DC converter that stabilizes the output voltage. This is done by using a feedback loop and compares the output voltage to the internal reference voltage. When the output voltage drops below the reference voltage, the regulator turns on the output transistor, which then increases the output voltage back to the reference voltage. When the output voltage exceeds the reference voltage, the output transistor is turned off and the output voltage drops back to the reference.

In addition to a voltage regulator, the MIC5235-3.3BM5-TR also contains additional protection features such as over-voltage and short-circuit protection. Voltage overshoot and undershoot protection is also built in and can be adjusted, allowing the device to operate outside of normal operating parameters and protecting it from damage caused by transients. These protection features allow the device to be used in applications where the input voltage may be unstable.

Conclusion

The MIC5235-3.3BM5-TR is a 3.3V, 1A linear regulator that is part of the voltage regulator linear category of power management integrated circuits (PMICs). It features many desirable qualities, such as a wide input voltage range, a low quiescent current, and built-in protection features. Its compact size and low price make it suitable for many low-power applications in consumer electronic, automotive and embedded systems.

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