MIC4680-5.0BM-TR

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The MIC4680 is a 1A step-down voltage regulator with integrated high-side and low-side switches, produced by Microchip. Its primary application field lies in providing a fixed output voltage from a wide input voltage through the use of a buck regulator. This device is particularly suited for low-output applications with a 5V output, due to its small form factor and excellent output regulation. Furthermore, its internal protection features include over-voltage, under-voltage and over-temperature protection, making it a safe and reliable solution for many applications.

The MIC4680 is designed around a hysteretic synchronous buck architecture. In this type of architecture, an oscillator (the master controller) creates high/low pulses with a given period. In order to generate a high voltage output, the master controller enables the high-side switch when the output voltage is lower than the reference. It then disables it when the output voltage reaches the desired output level. The low-side switch then turns on, charging the output voltage until the set reference is reached. This process is repeated periodically to keep the output voltage constant.

In order to improve the efficiency of the device, it is necessary to adjust the power dissipation over the switches and the output capacitors. MIC4680 uses a low-side current sense to electronically measure the output current. This allows for better power solutions with small changes in the output capacitance. Additionally, the MIC4680 has an integrated high-side MOSFET and low-side MOSFET with low turn-on and turn-off losses, enabling very high-efficiency solutions in a small space.

The MIC4680 comes with several features aimed at making it a smart, simple and cost-effective option. It includes a soft-start feature to protect over-current conditions during the startup phase. It also includes an analog remote sensing that allows for a very accurate and continuous regulation of the output voltage. The device can be programmed using a serial bus for improved communication capabilities.

In summary, the MIC4680 is a versatile part that provides an excellent solution for low-voltage, high-current applications. It features integrated high-side and low-side MOSFET switches to enable high-efficiency-step-down topologies, along with a built-in soft-start protection, programmable current limit and analog remote sensing for accurate control. It is an ideal solution for applications where the output voltage must be precisely regulated, yet economical and efficient.

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