MIC37152YM

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The MIC37152YM is a linear voltage regulator with integrated MOSFET. It is part of a family of Voltage Regulators from Microchip. The MIC37152YM is designed for use in applications such as circuits requiring low power, low noise, and high efficiency. The device provides a current-mode PWM controller combined with a MOSFET and other circuitries for design simplicity, improved efficiency and cost savings.

Features

• 6-bit DAC allows setting output voltage from 0.8V to 2.5V in 15mV increments.
• Current-mode PWM control with constant on-time.
• The level of the PWM control logic is programmable.
• The switching frequency is internally programmable.
• Soft-start is implemented using an internal capacitor.
• Power-On Reset function available.
• The output voltage accuracy is ±2.5%.
• Thermal shutdown and short-circuit protection.
• Automatic fault protection for the MOSFET.
• The device is available in the SOT89-3 package.

Application fields

The MIC37152YM is well suited for a variety of power supply applications such as notebook and mobile phones, LCD displays, and PDAs. It can also be used in white goods and other industrial applications. The device offers high performance, excellent load and line regulation, and low ripple noise.

Working Principle

The MIC37152YM operates in a constant frequency current-mode control architecture. The device consists of an internal high-side power MOSFET, a voltage reference, a current sensing circuit, comparators, an oscillator, and optocoupler interface. The output voltage of the device is proportional to the digital-to-analog converter (DAC) code, which is set via the I2C interface. In a typical application, an input voltage is applied to the VIN pin and regulated output voltage is provided at the VOUT pin in a current-mode PWM architecture.

At the beginning of each switching cycle, the DAC code is compared to the output voltage via the voltage loop comparator. If the output voltage is lower than desired, the PWM comparator switches low, and the internal power MOSFET turns on. The power MOSFET then regulates the output voltage by sinking or sourcing current depending on the load current direction. The output voltage is regulated by the feedback loop and DAC code.

The MIC37152YM also features and advanced features such as thermal shutdown and short-circuit protection. The device also includes an adjustable switching frequency and automatic fault protection for the power MOSFET. The device automatically shuts down if a short-circuit is detected and current limit is activated. This feature helps extend the life of the device by avoiding constant high current flow.

Conclusion

The MIC37152YM is a linear voltage regulator with integrated MOSFET. It is a great choice for those looking for a highly efficient, low noise, and low power solution for their power requirements. The device offers excellent load and line regulation, and provides an adjustable switching frequency, automatic fault protection, and thermal shutdown. The device is ideal for applications such as notebook and mobile phones, LCD displays, PDAs, white goods, and other industrial applications.

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