Introduction

MIC5295-5.0YD is a low-dropout (LDO) linear voltage regulator from Micrel Inc. It is fully specified for operation from -40C to +125C, and adjustable output voltage range from 1.25V to 6.0V, with over-current and over-temperature protection. This device supports peak output currents up to 1.0A and low dropout voltage. The MIC5295-5.0YD is offered in thermally-enhanced 8-Pin micro SMD package, and produces highly accurate and stable regulated output.

Applications

The MIC5295-5.0YD is suitable for various applications, including hand-held devices such as mobile phones, PDAs, digital cameras and portable audio equipment, where low dropout voltage and low quiescent current are key factors. Other typical applications include notebooks, high reliability and processing systems, 3G base-stations and point-of-sale terminals.

Working Principles

The MIC5295-5.0YD is a true low-dropout voltage regulator. Its high efficiency, superior linearity, and increasing power savings at low current levels make it an ideal solution for all types of low-voltage and low-noise applications. The MIC5295-5.0YD consists of an on-chip voltage reference, an error amplifier, and a control circuit. The error amplifier compares the input voltage divider to the reference voltage and adjusts the output voltage accordingly. The voltage divider has two resistors connected in series, the higher resistors ground the output voltage terminal,the lower resistor values change the output voltage by setting an external reference voltage at the input. The error amplifier reads the reference voltage and adjusts the gate of an onboard P-channel MOSFET which switches the output voltage.

FEATURES/BENEFITS

• Operating Voltage Range: The MIC5295-5.0YD operates from 4.5V to 6.0V and provides an adjustable output voltage range from 1.25V to 6.0V.

• Output Current: The MIC5295-5.0YD can support up to 1.0A of output current.

• Dropout Voltage: The MIC5295-5.0YD features an ultra-low dropout voltage of 0.4V typical, at full load.

• Output Noise Level: The MIC5295-5.0YD provides low noise levels, usually less than 70uVrms

• Reverse Leakage Protection: The MIC5295-5.0YD has reverse leakage protection to protect the output against reversed polarity input conditions.

• Thermal Protection: The MIC5295-5.0YD has over-temperature protection and will shut down if the junction temperature of the device exceeds 150C.

• Environmental Compatibility: The MIC5295-5.0YD is specified from -40C to +125C and is available in an 8-pin micro SMD package.

Conclusion

The MIC5295-5.0YD is a low dropout linear voltage regulator designed in innovative CMOS technology. It is ideal for portable and high reliability systems that require low noise, reverse leakage protection, and a high PSRR. It supports load currents up to 1.0A, and provides an adjustable output voltage range from 1.25V to 6.0V. The MIC5295-5.0YD also features an ultra-low dropout voltage and over-temperature protection. With its high efficiency and small footprint, the MIC5295-5.0YD is an ideal solution for many applications.