MIC5371-SSYMT-TR

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MIC5371-SSYMT-TR Application Field and Working Principle

The MIC5371-SSYMT-TR is a low-dropout linear voltage regulator supplied in a small SOT-23 package, which has been designed for use primarily in space-constrained, high-performance power management applications. The device features low quiescent current and constant-frequency operation for increased efficiency and a wide operating temperature range.

Application Field

The MIC5371-SSYMT-TR is ideal for low-power applications such as portable and battery-powered equipments, cell phones, wireless network products, Bluetooth devices, medical instruments and industrial controls. The device is guaranteed to provide an ultra-low dropout of 0.06 V at 300 mA and 0.17 V at 500 mA of output current. This makes the MIC5371-SSYMT-TR ideal for applications where low power consumption is critical.

Working Principle

The MIC5371-SSYMT-TR is a linear voltage regulator that utilizes an external resistor to set the output voltage. It is similar to a Charge Pump Regulator in its operations. It is based on current-mode voltage regulation, which requires the use of an external resistor divider at the output voltage point to set the desired output voltage. The output voltage of the MIC5371-SSYMT-TR will always follow the voltage present across the external resistor divider.

The regulator uses an internal error amplifier to compare the output voltage and the reference voltage. If the output voltage is higher than the reference voltage, the error amplifier reduces the base current of the pass transistor, resulting in a decrease in the output current and a decrease in the output voltage. Similarly, if the output voltage is lower than the reference voltage, the error amplifier will increase the base current of the pass transistor, resulting in an increase in the output current and an increase in the output voltage.

The MIC5371-SSYMT-TR also includes an integrated power-on reset (POR) circuit that monitors and maintains the integrity of the output voltage by monitoring the rising waveform on power up. The output will remain in a low-impedance state until the output voltage rises to within 5% of the nominal output voltage.

Conclusion

The MIC5371-SSYMT-TR is a low-dropout linear voltage regulator and is ideal for low-power applications. The device utilizes a current-mode voltage regulation scheme with an integrated reset circuit to guarantee output voltage accuracy and stability. The MIC5371-SSYMT-TR is an excellent choice for battery-powered and industrial applications.

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