MIC5203-4.5YM5-TR

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PMIC - Voltage Regulators - Linear

MIC5203-4.5YM5-TR voltage regulator is a complete, high-performance low dropout (LDO) linear regulator powering portable or low-power embedded systems. It offers very low quiescent current of just 2 μA in light load conditions, and an input voltage range up to 6V. In addition, tolerance up to ±2% and extremely low drop-out voltage (200 mV at full 2A load) ensure that regulation stays tight across line and load variations. The device also offers internal thermal, output overcurrent and short circuit protection, in addition to over-temperature protection.

The MIC5203-4.5YM5-TR voltage regulator is suitable for powering low load MCU applications, including battery-powered and portable electronic products such as cell phones, medical and wearable devices, laptops, and other personal audio/video equipment. It features a wide input voltage range of up to 6V and can deliver up to 2A of output current at a 1.5V output voltage when paired with a low drop-out voltage transistor.

The MIC5203-4.5YM5-TR device has an internal bandgap reference that maintains an accurate output voltage over variations in line voltage and loads. The device also offers low noise operation and fast line regulation. The low drop-out voltage performance and the low quiescent current make it ideal for mobile or other battery-powered applications. The device is available in a space-saving VSSOP-8 package.

Working principle

The MIC5203-4.5YM5-TR voltage regulator operates in a low dropout mode, in which the input voltage must be greater than the output voltage by at least the value of the drop out voltage. This is accomplished by adjusting the control voltage. The overall current flow through the device is always the same regardless of the load; it always exceeds the load current by the value of the current drawn by a load. The device maintains an output voltage that is slightly greater than the reference voltage divided by the feedback resistor voltage divider.

An external resistor divider network is used to set the output voltage. The ratio between the resistors sets the output voltage of the device. When the output voltage is set, the error amplifier maintains a constant output voltage regardless of the input voltage and load current variations. The error amplifier compares the feedback voltage with the output voltage and adjusts the control current accordingly. The control current then adjusts the gate voltage of the P-channel MOSFET to maintain the output voltage. When the load current increases, the control current also increases, and the P-channel MOSFET reduces the resistance of the pass element, allowing more current to the load.

Conclusion

The MIC5203-4.5YM5-TR voltage regulator is a cost-effective LDO solution for powering low load applications. It offers low quiescent current, low drop-out voltage and an accurate output voltage, as well as excellent line and load regulation. The device also offers several protection features including over-current and short-circuit protection. Its small package size and low power consumption make it an ideal choice for battery-powered or other portable products.

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