MIC94355-4YMT-TR

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The MIC94355-4YMT-TR is a low dropout regulator (LDO) from Micrel Inc. It is a linear voltage regulator that provides a regulated output voltage from a higher input voltage. It is designed for low noise operation, low quiescent current, and fast transient response. The internal pass elements feature 150mA of output current, input voltage up to 20V, and a dropout voltage of 120mV at 150mA.

As a linear voltage regulator, the MIC94355-4YMT-TR is designed for DC/DC conversion in applications where input voltages are lower than the regulated output voltage. It is suitable for use in automotive, consumer, industrial, medical, and other applications where low noise linear regulation is required. It is well-suited for powering low voltage micro-controller systems and provides automatic load-line tracking to meet current limiting requirements.

The MIC94355-4YMT-TR employs current-mode control, enabling it to achieve high efficiency with very little output ripple. Its Voltage Feed-Forward is enabled by a resistive voltage divider connected to the SET pin of the regulator. The voltage applied to the SET pin is compared with a reference voltage which is generated by an internally trimmed bandgap reference network. As the SET voltage varies, the feedback loop adjusts the output voltage accordingly.

The MIC94355-4YMT-TR includes several features. It employs a low quiescent current of 65µA and a low temperature coefficient of -15mV/°C. It includes an over-current protection circuit, which automatically limits the output current in the event of an over-current condition. It also includes short-circuit protection, thermal shutdown protection, and an output transistor capability to deliver up to 150mA of continuous current.

There are several ways to reduce the output noise of the MIC94355-4YMT-TR. The use of an external bypass capacitor will reduce the output noise by attenuating the noise riding on the input voltage. The use of a large external compensation capacitor, in combination with the onboard compensation loop, will reduce the output noise by providing fast transient response along with good stability. An external filtering network can also be used to reduce noise or minimize the effects of external ground noise.

In summary, the MIC 94355-4YMT-TR is a linear voltage regulator designed for low noise operation, low quiescent current, and fast transient response. It is suitable for powering low voltage micro-controller systems and provides automatic load-line tracking to meet current limiting requirements. It includes several features, such as over-current protection, short-circuit protection, and thermal shutdown protection. Additionally, noise reduction techniques can be used to further reduce the output noise.

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