MIC3172YM

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MIC3172YM Application field and Working Principle

The MIC3172/ MIC3272 are dual/quad micropower series mode controllers designed to drive MOSFETs in synchronous DC/DC buck or boost converter applications while staying within a tight SOT-23 package.

The MIC3172YM is a dual series mode controller typically used in the SYNC buck DC/DC converter applications. The MIC3172YM is capable of providing up to 0.7A of load current with an efficiency of 90% or higher. The MIC3172YM offers both low quiescent current and low EMI advantages along with its integrated high frequency switching architecture.

Application Field

The MIC3172YM series can be used in a wide variety of synchronous buck DC/DC converter applications. It offers excellent performance in the battery to load applications such as the mobile phone, portable computers, and GPS systems. The device also provides improved transient and steady state efficiency.

The MIC3172YM series can be used in many other synchronous buck DC/DC converter applications including MP3 players, digital cameras, wireless LAN, chargers, and PDAs.

Working Principle

The MIC3172YM is a dual series mode controller which enables the design of highly efficient synchronous buck DC/DC converters with a minimum external component count. The MIC3172YM senses the output voltage to regulate the output current in synchronous buck topology.

The MIC3172YM consists of two main components, the series mode control loop and the synchronous buck driver. The series mode control loop senses the output voltage and regulates the gate voltage of the output MOSFETs to maintain a constant output voltage. The synchronous buck driver drives the MOSFETs with a fixed frequency, which is programmed with an external resistor.

The MIC3172YM uses a proprietary feed forward control loop to ensure stable operation with no external feedback components. The two-stage architecture allows for low RDSon MOSFETs and high conversion efficiency. The device is also able to maintain an accurate output voltage while operating in wide line and load conditions.

The MIC3172YM also provides an overvoltage protection (OVP) circuit. The OVP circuit monitors the output voltage and will disable the part if the output voltage exceeds the set threshold. Additionally, the MIC3172YM provides an over current protection (OCP) circuit which monitors the load current and will disable the part when the output current exceeds the OCP threshold.

Conclusion

The MIC3172YM is a dual series mode controller designed to drive MOSFETs in synchronous DC/DC buck or boost converters. The MIC3172YM offers low quiescent current and low EMI and is capable of providing up to 0.7A of load current with an efficiency of 90% or higher. The device is suitable for a wide range of synchronous buck DC/DC converter applications such as mobile phones, portable computers, MP3 players, and digital cameras. The MIC3172YM also provides an OVP and OCP circuit to protect the device under fault conditions.

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