MIC22205YML-TR

MIC22205YML-TR application field and working principle

PMIC - Voltage Regulators - DC DC Switching Regulators

The MIC22205YML-TR is a buck switch mode power supply (SMPS) regulator, designed and manufactured by Microchip Technology Inc. This regulator offers a maximum output of 1.5 A, current-foldback protection, and thermal shutdown. The MIC22205YML-TR operates by controlling the pulse width of a buck regulator control switch. The control switch functions as a high-speed switch, which is turned on and off many times in a rapid sequence. This technique simultaneously converts a fixed input voltage to a smaller adjustable output voltage.

The MIC22205YML-TR is ideal for applications requiring low power and high efficiency from a buck regulator, such as battery-operated applications. The device can easily be configured to output different voltages and is designed with a wide input range, typically 3 V to 40 V. The MIC22205YML-TR also offers a soft-start feature and can be configured to enable/disable the output. Additionally, the MIC22205YML-TR has low quiescent current and low external component count, thus making it an ideal choice for portable and battery-powered systems.

Working Principle

The MIC22205YML-TR operates in a switching mode. It has two major components: a power switch and an error amplifier. The power switch is driven by a PWM control signal from the internal oscillator and error amplifier. When the power switch is on, current flows from the input voltage source to the output voltage load. When the power switch is off, the energy stored in the inductor is released slowly to the output voltage load.

The output voltage of the switch mode power supply is adjusted by controlling the duty cycle of the switching cycle. The duty cycle is determined by the error amplifier, which compares the output and reference voltage and generates an error signal. This error signal is amplified and used to drive the power switch.

The error amplifier is also referred to as a compensation circuit. The primary function of the compensation circuit is to ensure stable operation under dynamic load conditions. The compensation circuit should be designed in such a way that it provides an adequate power supply output voltage stability over the entire range of load conditions.

In addition to its control loop, the MIC22205YML-TR also features several protect features. These include over-voltage protection, under-voltage protection, and over-temperature protection. The over-voltage protection is achieved by monitoring the output voltage and comparing it to the reference voltage. When the output voltage exceeds a certain threshold, the output is shut down. The under-voltage protection is achieved by monitoring the input supply voltage and comparing it to the lower threshold. When the input voltage drops below the lower threshold, the MIC22205YML-TR will shut off the output until the input voltage rises above the lower threshold.

The over-temperature protection is achieved by monitoring the operating temperature of the MIC22205YML-TR. When the operating temperature exceeds a certain threshold, the output is shut down until the operating temperature drops below the threshold. Other features include power good output, enable/disable, and soft start.

Conclusion

The MIC22205YML-TR is a buck switch mode power supply that provides efficient, accurate and low power regulated output with a wide input range. The MIC22205YML-TR offers several features such as current foldback protection, over-voltage protection, under-voltage protection, and over-temperature protection. It also offers protection against short circuit conditions. Additionally, it has low quiescent current and low external component count, thus making it an ideal choice for battery-powered systems.