Introduction

The MIC5313-F4YMT-TR is part of a family of sophisticated, low dropout linear regulators from Micrel. It is an easy to use, robust and cost effective linear voltage regulator suitable for a whole range of applications that require a reliable, rock-solid voltage regulation. The MIC5313-F4YMT-TR features a very small footprint of 1.71 mm x 1.97 mm and a wide variety of output voltage options, ranging from 1.2 V to 5.5 V.

Features

• Low Dropout Voltage: 100mV at 200mA.
• Wide Output Range:1.2V~5.5V.
• Small Footprint: 1.71mm x 1.97mm.
• High Efficiency.

Applications

The MIC5313-F4YMT-TR is ideal for applications requiring high efficiency, and are available in a small footprint, such as Instrumentation, medical, battery powered devices and cellular phones. The MIC5313-F4YMT-TR can also be used as a replacement for larger discrete devices, reducing design time and cost.

Bootstrap Capacitor

The MIC5313-F4YMT-TR requires a bootstrap capacitor for operation. The bootstrap capacitor must ensure that the output voltage is stable under all load conditions, from light loads to full load. The bootstrap capacitor is also used to generate a reference voltage, which is then output to the regulator’s output pin.

Working Principle

The MIC5313-F4YMT-TR works by using a combination of the input voltage and the bootstrap capacitor to generate a voltage reference. This voltage reference is then compared to the external feedback voltage. If the external feedback voltage is greater than the reference voltage, then the regulator will reduce the output voltage. Conversely, if the external feedback voltage is less than the reference voltage, then the regulator will increase the output voltage.

The regulator also contains two internal transistors – a P-channel and an N-channel MOSFET – which are used to control the output voltage. The P-channel MOSFET is used to increase the output voltage, and the N-channel MOSFET is used to decrease it. By controlling the gate voltages of these transistors, the regulator is able to regulate the output voltage.

Conclusion

The MIC5313-F4YMT-TR is an advanced, low dropout linear voltage regulator from Micrel. It features a very small footprint and a wide variety of output voltage options. The linear voltage regulator works by using the input voltage, a bootstrap capacitor, and two internal transistors to regulate the output voltage.