MIC69301-1.2WR

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The MIC69301-1.2WR (or simply MIC69301) is a low-dropout linear regulator with a sub-2mV dropout. Its small footprint, low power consumption, and high current output capability make it ideal for applications where space, power, and cost are at a premium. The MIC69301 is available in fixed output voltages from 1.2V to 5.5V and is capable of delivering up to 1.2A of continuous current. The device is rated for operation from an input voltage range of 2.15 to 5.5V, and it includes an internally set current limit and an over-temperature protection circuit. The device also has two enable pins that can be used to control the power on/off or to switch the regulator off to reduce the stand-by current. It can also be used in a high-side configuration, allowing for outside-the-box applications.

The MIC69301 is ideally suited for a wide variety of consumer electronics, such as digital still cameras, PDAs, cellular phones and personal audio players. Its very low output voltage drop across a wide temperature and load range makes it well suited for use in battery powered applications. Due to its low power consumption, the delay time from the rising input voltage to the stable output voltage is minimized, making the MIC69301 suitable for space-critical applications.

The MIC69301 shares the same voltage regulator principles as other linear voltage regulators. It consists of an internal error amplifier, power transistor, current limiter, thermal limiting circuitry and a feedback network typically provided by an external resistor divider. It begins by comparing a fraction of its output voltage with a reference voltage. The output of this error amplifier is compared with the load current and an internal control loop ensures that the output voltage is maintained. With this internal control loop, the voltage loss across the output can be kept at fractions of a volt even under the most demanding load conditions.

Unlike switching regulators, linear regulators rely on the differences in voltage that they produce across their outputs while maintaining constant output. The MIC69301 uses an advanced PMOS pass transistor to reduce the voltage drop across its output, eliminating the need for an external voltage setting resistor and allowing for low power consumption.

To summarize, the MIC69301-1.2WR is a low-dropout linear regulator perfectly suited for applications requiring space, power, and cost efficiency. It can be used in an array of consumer electronics applications and its wide voltage range, low quiescent current, and stable output make it suitable for a variety of battery operated electronic devices.

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