MP2315SGJ-Z

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The MP2315SGJ-Z is a monolithic, synchronous step-down power converter integrated circuit (IC) of MP\'s DC-DC switching regulator ICs. It provides a low cost, efficient current regulated buck converter optimized for low input voltages up to 2.5V. The MP2315SGJ-Z features a maximum output current of 5A and its integrated internal power MOSFET and high efficiency switching operation, which makes it suitable for a wide range of power supply applications.

Applications

The MP2315SGJ-Z is suitable for many of the following applications:

• Cellular Handsets
• PDAs
• Digital Still Cameras
• Portable Media Players
• Notebook Computers
• Portable Terminals
• Handheld Radios
• Positive & Negative Adaptors

Working Principle

The step-down switching regulator of the MP2315SGJ-Z operates by controlling the ON time of an internal power MOSFET. The MP2315SGJ-Z can achieve high efficiency due to the MOSFET\'s low ON resistance. The application of the operating principle for basic voltage regulation is most commonly done using a Voltage Mode Control (VMC) technique.

At the beginning of an ON time cycle, the voltage at the output of the circuit is equal to the input voltage. As the voltage at the output of the circuit rises, the output of the error amplifier increases as well. At a given output voltage, the error amplifier reaches its reference voltage level. Then the error amplifier outputs a high level and turns off the MOSFET. After the MOSFET is turned off, the voltage on the capacitor is discharged.

The charging and discharging of the capacitor at the output of the circuit is repeated until its output is regulated at the desired constant voltage. By varying the ON time to charge the output capacitor and consequently regulate the output voltage, the MP2315SGJ-Z is designed to operate in either a voltage mode or a constant current mode.

The MP2315SGJ-Z supports Pulse Frequency Modulation (PFM) for light load, the Pulse Width Modulation (PWM) for heavy load, and the Auto PWM/PFM (APP) for all load conditions. It supports an ultra-low quiescent current, which is suitable for most battery powered electronics.

Conclusion

The MP2315SGJ-Z is a low cost, efficient, synchronous step-down, DC-DC switching regulator IC optimized for low input voltages up to 2.5V. With features such as a maximum output current of 5A and integrated internal power MOSFET, the MP2315SGJ-Z is suitable for a wide range of power supply applications. The operating principle of the step-down switching regulator is most commonly done using the Voltage Mode Control (VMC) technique and it supports an ultra-low quiescent current, making it ideal for battery powered electronics.

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