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Introduction

The MIC5397-GPYMT-TR is a high-efficiency ultra-low-dropout (ULDO) Linear regulator. It has an extremely low dropout voltage of 130mV at a load current of up to 600mA and low 125µV RMS output noise. The MIC5397-GPYMT-TR has a very small footprint of just 1.45mm x 2.45mm and consumes only 177µA in low-dropout (LDO) mode. It also has a very low quiescent current of only 11µA.

Application Field

The MIC5397-GPYMT-TR is typically used in portable applications such as cell phones and PDAs where the need for ultra-low dropout linear regulators is required. It is also well suited for automotive applications, digital still and video cameras, digital home appliances, and wireless devices. Its extremely low-dropout voltage, extremely low quiescent current and small package size ensure that the system has maximum power efficiency, minimal noise and an ultra-low thermal design.

Working Principle

The MIC5397-GPYMT-TR’s working principle can be divided into three stages: the input stage, the output stage, and the thermal compensation stage. In the input stage, the input voltage is regulated to a voltage level using the on-chip wide input voltage range of 4.5V to 28V. Then, the output stage, which is made up of an on-chip low dropout (LDO) linear regulator, regulates the input voltage to the desired output voltage. The final stage ensures that the output voltage remains stable by automatically compensating for any changes in temperature or load. In the case of temperature, a temperature sensor monitors the temperature and increases the output voltage to compensate for the voltage drop caused by temperature change. In the case of load changes, this device also provides an over load protection feature which shuts off the regulator in case of certain load conditions. This provides a high level of system bug detection.

Conclusion

The MIC5397-GPYMT-TR is an ultra-low-dropout linear regulator that provides high efficiency and very low quiescent current. It is also suitable for automotive and portable applications due to its small package size and low dropout voltage. It has a wide input voltage range of 4.5V to 28V and an output voltage range of 0.8V to 20V. The device also has an on-chip thermal compensation circuit, an overload shutdown protection feature, and a low 125µV RMS output noise.

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