MIC29300-3.3WU

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The MIC29300-3.3WU is a low-dropout linear regulator designed by Micrel Semiconductor. This regulator is a 3.3-volt, 300mA positive voltage regulator with an ultra-low drop-out voltage of 300mV and a maximum output current of 300 mA. The MIC29300-3.3WU is available in an 8-pin MSOP package. The MIC29300-3.3WU is designed to provide a reliable and easy to implement step-down solution to the installed base of designs where a low drop-out regulator is available in a tiny footprint. The regulator is capable of supplying more than 300 mA of output current and a low drop-out voltage of only 300mV. It is able to stabilize power without heat sinks, and its low drop-out voltage and low quiescent current make it an ideal choice for battery-powered applications.

Application Field

The MIC29300-3.3WU is well suited for applications where low-dropout, low-noise, and fast transient response are required. These include:

• Battery-powered systems such as cell phones, PDAs, digital cameras, and other portable electronics.
• High-end PCs and servers.
• Automotive systems such as power steering, suspension control, and interior lighting.
• Point-of-sale terminals and ATMs.
• Industrial equipment such as PLCs, relays, and panel displays.

Working Principle

The MIC29300-3.3WU regulator operates on a fixed voltage regulator principle. By controlling the gate voltage of an internal power MOSFET, the regulator can maintain a constant output voltage, regardless of the changes in load current. A low quiescent current helps reduce power dissipation and increase battery life in the application. An error amplifier is used to control the gate of the power MOSFET. The error amplifier maintains the output voltage by compensating for variations in line, load, and temperature. This circuit requires minimal external components and provides an excellent line, load, and temperature (MTTF) performance of up to 150 kHz.

The MIC29300-3.3WU is designed with a 2A rated load switch and a 0.8A rated bypass switch. The 2A load switch is used to improve the efficiency of operation. It is capable of handling load currents up to 2A and switching frequencies up to 150kHz. When the load current is less than 0.8A, the bypass switch is enabled which reduces power dissipation.

The MIC29300-3.3WU also features a number of protection features including current limit, thermal shutdown, and output overvoltage protection. It also features an adjustable soft-start feature to minimize inrush current at start-up. The MIC29300-3.3WU also features a unique fold-back current limit function which prevents output voltage from decaying during heavy current transients.

Conclusion

The MIC29300-3.3WU regulator is an ideal choice for applications requiring low drop-out voltage, fast transient response, and low power dissipation. Its working principle operates on the fixed voltage regulator principle and requires minimal external components. The MIC29300-3.3WU also features advanced protection features such as overload current limit, thermal shutdown, and over voltage protection. With its high performance features and low power consumption, the MIC29300-3.3WU is an excellent choice for a wide range of battery-powered applications.

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