MIC4685-3.3BR TR

Introduction

MIC4685-3.3BR TR is a DC to DC switching regulator designed to provide a nominal 3.3V output from a 5V input. The part is based on advanced MOSFET design and optimized circuitry to provide ultra-low EMI radiation and efficient switching with less than 5% voltage ripple and noise. This converter is available in a standard 8-pin SO8W package, making it suitable for a wide range of application fields.

Application Field

MIC4685-3.3BR TR is suitable for a wide range of applicationsincluding telecommunication, industrial, automotive, consumer andmedical markets. It is mainly used to step-down a 5V supply to 3.3Vfor powering system-on-chip, ASICs and CPU, as well asother integrated circuits. Moreover, the part is designed for portablesystems with limited space, where high performance and low noise isrequired. It can also be used for LDO regulation, linear rail conversionand low drop-out regulation.

Working Principle

The working principle of MIC4685-3.3BR TR is based on the hystereticcontrol, which is a form of pulse-width modulation (PWM)regulation. The part is equipped with an oscillator, which provides apulse-train that is then used to control the internal MOSFET switch.The width of the pulse is modulated based on the differencebetween the actual output voltage and the desired voltage. This isachieved by the part\'s integrated feedback loop and error amplifier.When the voltage is lower than the desired voltage, the partincreases the pulse-width, which in turn increases the outputvoltage. When the desired voltage is achieved, the pulse-widthremains constant, so as to regulate and maintain the voltage level.

Conclusion

MIC4685-3.3BR TR is a DC to DC switching regulator that can provide a nominal 3.3V output from a 5V input. The part is designed with advanced MOSFET design and optimized circuitry to provide ultra-low EMI radiation and efficient switching with less than 5% voltage ripple and noise and is suitable for a wide range of applications such as telecommunication, industrial, automotive, consumer and medical markets. The controller is based on the hysteretic control which is a form of pulse-width modulation regulation.