MP3213DQ-LF-Z Integrated Circuits (ICs)

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This article provides information on the application field and working principle of the MP3213DQ-LF-Z voltage regulator, which belongs to the DC DC Switching Regulators family of Power Management ICs (PMICs).

What is a Voltage Regulator

A voltage regulator is a device used to maintain a constant voltage across an electrical system. It regulates the output voltage of a power supply by comparing the input voltage to a reference voltage. Generally, it is connected to the rectifier output to convert the AC voltage to a usable DC voltage. A voltage regulator achieves this by automatically disconnecting or reducing the power to the load when the input voltage exceeds the predetermined value, or connecting extra power to the load when the input voltage is too low.

Application Field of MP3213DQ-LF-Z Voltage Regulator

The MP3213DQ-LF-Z is designed for mobile and handheld application. It is a low quiescent current, step-down voltage regulator with an integrated low RON power switch. The low quiescent current makes it ideal for battery powered applications, while the low RON power switch helps to reduce power dissipation and extend battery life. The MP3213DQ-LF-Z is available in an industry-standard 8-pin WL-CSP package and offers up to 0.6A of load current at 3.3V output while consuming a maximum of 300µA of quiescent current.

MP3213DQ-LF-Z Working Principle

The MP3213DQ-LF-Z is a step-down voltage regulator with an integrated low RON power switch, which gives it the ability to reduce power dissipation and extend battery life. The following is the basic operating principal of the MP3213DQ-LF-Z.

• The power switch (MOSFET) is switched on and off at high frequency to control the output voltage. This high frequency switching is regulated by the VIN pin voltage.
• The VIN pin voltage is compared to an internal reference voltage, which is set to 2.1V. If the VIN pin voltage is higher than the internal reference voltage, the MOSFET will be switched off and the output voltage will be decreased.
• The output voltage is regulated by an internal PFM (pulse width modulated) voltage loop.
• When the output voltage is lower than a certain value, the MOSFET will be switched on to increase the output voltage.
• When the V IN pin voltage is lower than the internal reference voltage, the MOSFET will be switched on to increase the output voltage.
• The spreading inductor reduces ripple and improves the operational reliability of the voltage regulator.
• The external capacitors filter the output voltage and reduce the output voltage ripple.

Conclusion

The MP3213DQ-LF-Z regulated voltage regulator is a low quiescent current, step-down voltage regulator with an integrated low RON power switch. It is designed to provide a constant voltage to mobile and handheld devices while consuming a low quiescent current and reducing power dissipation. It works by switching the integrated MOSFET at high frequency to control the output voltage. This regulation is achieved through an internal PFM (pulse width modulated) voltage loop, with the VIN pin voltage being compared to an internal reference voltage. External capacitors are used to filter the output voltage and reduce output voltage ripple.

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