MIC5219-3.3BM5-TR

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A linear voltage regulator is a type of PMIC (power management integrated circuit) that functions by providing a regulated output voltage depending on the input voltage it is supplied with. The MIC5219-3.3BM5-TR is a linear voltage regulator used for polyphase applications and regulated supplies. This voltage regulator is designed with low quiescent current and low dropout. It operates on a 3V to 6.5V input voltage and supplies a regulated 3.3V output voltage.

Features of the MIC5219-3.3BM5-TR

The MIC5219-3.3BM5-TR is a single phase linear voltage regulator featuring a low quiescent current of 8.5 µA (typical), a maximum quiescent current of 10 µA (typical), a low dropout voltage of 300 mV (typical), an accurate output voltage regulation of ±2%, a line regulation of ±0.01%, an operating temperature of -40°C to +85°C, and an extended temperature operating range of -40°C to +125°C. This linear voltage regulator has an excellent power supply rejection ratio of 60 dB (typical), a high power supply ripple rejection of 65 dB, a wide analog input voltage range of 3V to 6.5V, and a high output current of 200mA.

Applications

The MIC5219-3.3BM5-TR linear voltage regulator is ideal for applications where the output voltage needs to be regulated with greater accuracy and lower power consumption. It is most commonly used for devices requiring 3.3V, such as cell phones and digital devices like cameras, digital music players, and personal digital assistants. It also finds use in electronic and RF module applications, as well as for powering battery-backed SRAM devices.

Working Principle

The MIC5219-3.3BM5-TR linear voltage regulator uses a simple three-terminal regulator configuration including the input, ground, and the output terminals. The input voltage is initially applied to the input terminal and a voltage reference circuit inside the regulator helps control the output voltage to a fixed value determined by the voltage reference setting. This voltage is compared with the input voltage by an error amplifier, which then controls how much current runs through an internal pass transistor. This transistor is used to control the output voltage and if the output voltage is smaller than the reference voltage, the error amplifier increases the current flowing through the pass transistor allowing more current to pass through, which in turn increases the output voltage. If the output voltage is greater than the reference voltage, then the error amplifier decreases the current flow to drop the output voltage. This ensures the output voltage remains at the desired level. This method is called “linear regulation” because the current is always kept at a constant level.

Conclusion

The MIC5219-3.3BM5-TR is a highly reliable single phase linear voltage regulator that is designed for polyphase applications and regulated supplies. It features a low quiescent current, low dropout voltage, an accurate output voltage regulation of ±2%, a wide analog input voltage range of 3V to 6.5V, an excellent power supply rejection ratio of 60 dB, and a wide temperature operating range of -40°C to +125°C. This linear voltage regulator is ideal for applications where the output voltage needs to be regulated with greater accuracy and lower power consumption. It finds extensive use in cell phones, digital devices, RF module applications, and for powering battery-backed SRAM devices. The working principle of this linear voltage regulator involves the use of a three-terminal configuration and an internal pass transistor to maintain the voltage regulation.

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