MIC7400YFL-TR

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MIC7400YFL-TR Application Field and Working Principle

The MIC7400YFL-TR is a DC-DC switching regulator from Micrel, Inc., and a widelyused device in the field of power management integrated circuits (PMICs). This part is classified as a Voltage Regulator and, in particular, as a DC-DC Switching Regulator.

The MIC7400YFL-TR is designed to provide a regulated output voltage from an adjustable input voltage of up to 39V at up to 1A of continuous output current. This device offers high efficiency of up to 92%, and is usually operated with an input voltage of up to 28V. Moreover, it features a wide range of operating frequency, ranging from 300 KHz to 2MHz.

Output Voltage Regulation

For stable output voltage regulation, the MIC7400YFL-TR offers a precision reference voltage of 1.250V. Additionally, using an external resistor divider network, some flexibility is provided for output voltage setting. The device also offers current limit protection as well as over-temperature protection, providing safe operation and reliable current delivery.

Switch Frequency and PWM Features

The MIC7400YFL-TR is regulated by a fixed frequency Pulse Width Modulation (PWM) controller and clocked at up to 1.23MHz. Moreover, current mode operation provides fast load response characteristics and accurate constant-voltage regulation, making it an ideal solution for many power management applications.

Internal Synchronization and Disable Functionality

The MIC7400YFL-TR offers an internal synchronization function allowing the user to synchronize the internal oscillator to an external clock with a frequency range of between 300 KHz and 2MHz. Furthermore, the device incorporates a soft-start feature which eliminates inrush current experienced during startup. Lastly, the ability to disable the switch output when not in use can improve the overall power efficiency of the device, and enhance system performance.

Package and Layout Considerations

The MIC7400YFL-TR is available in a 24-lead Plastic Quad Flat Package (PQFP) with a Dimension of 7.5mm (L) x 7.5mm (W). To ensure optimal performance, it is important to consider layout considerations such as loop inductor size and placement, component placement, and component values according to the device datasheet. Additionally, it is important to check for parasitic capacitances, inductances and resistances in the circuit that may adversely affect the device performance.

Conclusion

The MIC7400YFL-TR from Micrel, Inc. is an excellent example of a DC-DC switching regulator, offering excellent performance and a wide range of operating conditions for power management applications. It offers excellent output voltage regulation, switch frequency and PWM features, internal synchronization and disable functionality, and comes in a small PQFP package for maximum flexibility and usability.

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