MCP1258T-E/MF

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The MCP1258T-E/MF is a DC-DC buck (step-down) switching regulator that regulates an input voltage source to a lower and more stable output voltage, such as a 3.3V or 5V output. It is part of a family of DC-DC switching regulators, all of which fall into the broader category of PMIC (Power Management IC) voltage regulators. The MCP1258T-E/MF has many features and applications, making it a desirable choice for projects that require regulated DC power.

Features and Benefits

The MCP1258T-E/MF has several features that make it a desirable choice for many projects:

• Wide 6V to 38V Input Voltage Operating Range – making it suitable for use with many power sources, from wall outlets to USB ports.
• Multiple Selectable Output Voltages – allowing users to easily configure the output voltage.
• Low Quiescent Current – ensuring low power consumption
• Integrated Over-Temperature, Over-Current, and Over-Voltage Protection – providing added protection and stability

Working Principle

The MCP1258T-E/MF operates using PWM (Pulse Width Modulation) mode control. This type of control is effective in providing a steady output voltage and current, despite wide variations in input voltage. The operation of a DC-DC switching regulator such as the MCP1258T-E/MF can be broken down into three phases:

• Phase 1: The voltage regulator begins by monitoring the input voltage. This is done through an internal comparator, which continuously compares the input voltage to an internally generated reference voltage. If the input voltage is higher than the reference voltage, the comparator produces a high voltage signal.
• Phase 2: The high voltage signal activates an internal switch – usually a MOSFET – to connect the input voltage to a large inductor. The inductor, with help from the switch, begins building up a large electric field.
• Phase 3: When the electric field reaches a certain point, the switch quickly turns off, causing the electric field to collapse back into the input voltage. This causes a large current to flow through the output diode and resistor, producing a steady output voltage.

Applications

The MCP1258T-E/MF is suitable for a wide range of applications, including:

• PCIe Power Systems – providing 3.3V or 5V output for PCI Express devices
• Networking Equipment – powering switches, routers and other networking equipment
• Telecommunication Systems – providing regulated power for base stations and other telecommunication equipment
• Industrial Automation – powering industrial automation devices such as robots and PLCs
• Consumer Electronics – providing regulated power for consumer electronics such as cell phones and tablets

Conclusion

The MCP1258T-E/MF is a DC-DC buck (step-down) switching regulator suitable for a wide range of applications. It operates using PWM (Pulse Width Modulation) mode control, which is effective in providing a steady output voltage and current, regardless of variations in input voltage. The MCP1258T-E/MF is part of the broader family of PMIC (Power Management IC) voltage regulators and is suitable for many uses, from PCI Express devices to consumer electronics.

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