MIC4575-3.3BU

MIC4575-3.3BU Application Field and Working Principle

The MIC4575-3.3BU belongs to the PMIC – Voltage Regulators – DC DC Switching Regulators category. This device is a step-down current-mode PWM controller, specifically designed for low-voltage, high-current DC-DC applications. It features a very small size, low cost, and high efficiency.

The MIC4575-3.3BU has a high pulse current capability, low profile package, integrated power MOSFET, fast transient response, and low dropout operation. It is designed to provide high efficiency and low output voltage ripple to power sensitive applications. The device utilizes current-mode PWM control to provide excellent line and load regulation.

The primary application of the MIC4575-3.3BU is battery-powered DC-DC converters and applications that require a low quiescent current. It is also suitable for high speed switching, automotive and industrial applications. The device is also compatible with external components for use in custom designs.

Applications

• Battery-powered applications
• Low dropout operation applications
• High speed switching applications
• Automotive and industrial applications
• High efficiency DC-DC conversion
• Low output voltage ripple applications

Working Principle

The MIC4575-3.3BU is a step-down current-mode PWM controller that uses current-mode operation to control the output of the power supply. When the output voltage goes below the regulation point, an internal oscillator turns on the power MOSFET. When the output voltage increases, the power MOSFET is turned off. The output voltage is regulated by monitoring the peak current of the power MOSFET. The output voltage is also regulated by pulse frequency modulation (PFM).

The MIC4575-3.3BU has a fast transient response, allowing the device to adjust quickly to changes in loading and input voltage. The minimum on-time of the device is only 2μs, allowing the device to operate at low output voltage ripple. The minimum off-time of the device is also adjustable, allowing the user to optimize efficiency and minimum pulse frequency.

The MIC4575-3.3BU provides protection against overvoltage, undervoltage, over-temperature and current-limit conditions. It also provides soft-start and current-share functions to support multiple power supply configurations.

The MIC4575-3.3BU is a versatile device that supports a wide range of applications and offers exceptional performance. It is an ideal solution for low-voltage, high-current DC-DC applications.