MIC2172BM-TR

MIC2172BM-TR Application Field and Working Principle

The MIC2172BM-TR DC-DC switching regulator is used in a range of applications, including consumer electronics, industrial, energy, computing and communications. It is a simple, cost effective, and often an efficient way to provide power management in a device without needing large or complex components. Additionally, the MIC2172BM-TR can be used to control current in other applications, such as a lithium ion battery management system, or in charging and discharging circuits.

The MIC2172BM-TR is a basic low-dropout (LDO) regulator with a fixed output voltage and a programmable current limit. It works by sensing the input voltage and automatically adjusting the current limit as needed to maintain a constant output voltage. The voltage regulation occurs by adjusting the on-time of the switching element, or pulse width modulator (PWM). When the device is not operating within a certain range, it will switch between high and low modes.

Features of the MIC2172BM-TR

The key features of the MIC2172BM-TR are its low cost, easy to use architecture, and high performance. Its internal voltage reference, 12-bit current sense, and accuracy of 0.5V enable precise current control, reducing power losses and improving efficiency. The device’s high switching frequency of 2MHz ensures a small footprint and low EMI.
The MIC2172BM-TR also features programmable frequency and soft start features. The frequency can be programmed from 200kHz to 2MHz, allowing the user to optimize the device for the desired application. The soft start function helps prevent any inrush current at power on and can be used to slowly ramp up the output. It also includes an enable pin which can be used to turn the device on or off.

Design Considerations

Before designing with the MIC2172BM-TR, it is important to consider the input voltage, output voltage and current, ambient temperature, and the load current. The input voltage range is 5.5V to 42V, making it suitable for a range of applications. The output voltage range is 1.5V to 5.5V, and the output current is programmable from 0.5A to 3A. The device will operate in temperatures from -40°C to +85°C. Additionally, the load current must be considered, as the device will have to supply the required amount of power to the load.

Working Principle of The MIC2172BM-TR

The working principle of the MIC2172BM-TR is based on pulse width modulation (PWM). This involves switching the voltage supply on and off very quickly, and the duty cycle, or on-time of the switch is adjusted according to the input voltage, output voltage and current settings. This allows the device to maintain a constant output voltage with varying input voltage and current settings.

The input voltage is sensed by the device and is compared to the reference voltage. Depending on the difference between the two, the on-time of the switch is adjusted to maintain the output voltage. The current sense feature is also used to maintain accurate current regulation by allowing the device to accurately detect the current being supplied by the input source. This helps reduce power losses and maintain efficiency.

In conclusion, the MIC2172BM-TR is a cost effective and efficient DC-DC switching regulator for providing power management in a device. Its low cost, low power losses, and high performance make it suitable for a range of applications. Its internal voltage reference, 12-bit current sense and high switching frequency also enable precise current control, making it an ideal choice for most power management applications.