MIC5208-3.3YMM

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The MIC5208-3.3YMM is a Micrel voltage regulator and is categorized as a linear Voltage Regulator under the Power Management ICs (PMIC). It is especially useful for personal, laptop and other small portable devices due to its small size, efficient performance and low-heat output. The device comes with several useful features like improved line and load regulation, current limiting, thermal shutdown and protected output, making it the perfect choice for medical, automotive and other point-of-load applications.

Key Features of the MIC5208-3.3YMM

• Space-saving 2x2-mm DFN Package
• Operating Voltages from 1.8V to 6.0V Input
• Output Current up to 150mA
• Dropout Voltage of 200mV (Typ)
• Low 225 mΩQ and 150 mΩQ External MOSFETs for Enhanced Efficiency
• High PSRR of 80 dB at 1 kHz and 54 dB to 120 kHz (1.8V)
• External Capacitors Reduced to 2X 10μF Ceramic per Output (1 Output)

Functional Block and Working Principle

The MIC5208-3.3YMM is a low power, ultralow dropout voltage regulator with a wide operating voltage range of 1.8V to 6.0V. It includes an internal error amplifier, an internal power switch, and a current limit circuit. The device can provide output currents up to 150mA while maintaining an ultra-low dropout voltage of 200mV at full load. It also features an adjustable current limit threshold and an adjustable power switch threshold that provides a precise adjustment for current limit, output voltage, power-up and power-down voltage level.

Figure 1 shows the functional block diagram of the MIC5208-3.3YMM device. The current through the pass transistor is monitored by a current sense amplifier, which compares the Kelvin-sensed current to an internal reference voltage. If the current value exceeds the internal reference voltage, the pass transistor is turned off, thereby current limiting the output.

The power-up and power-down threshold voltage is adjustable allowing both hysteretic and non-hysteretic voltage levels which lessens the need for external components. This provides the flexibility to make the MIC5208-3.3YMM device adapt to various applications, enabling it to be used as an adjustable output linear regulator. Furthermore, the device has an active low shutdown pin that allows the device to be disabled with low power consumption.

Applications

The MIC5208-3.3YMM is suitable for various personal, laptop, portable and other point-of-load applications, including medical and automotive. It is ideal for powering processors, memories, disk drives and other standard components, with high efficiency. This device can also be used to supply power to 3V and 5V peripherals. It operates over an input voltage range of 1.8V to 6.0V and has a low dropout voltage of 200mV at full load. The device features an adjustable output current limit threshold and an adjustable power switch threshold. This makes the MIC5208-3.3YMM an ideal choice for current and voltage regulated applications.

Conclusion

The MIC5208-3.3YMM device is a low power, ultralow dropout voltage linear regulator from Micrel. The device features an ultra-low dropout voltage of 200mV at full load and a wide operating voltage range of 1.8V to 6.0V, making it suitable for personal, laptop, portable and other point-of-load applications. It also includes an internal error amplifier, a current sense amplifier, an internal power switch, a current limit circuit and adjustable power and current limit thresholds. The device has an active low shutdown pin that reduces power consumption when it is not in use. These features make the MIC5208-3.3YMM an ideal regulator for various applications that require low power consumption, high efficiency and precise control.

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