MIC38HC45YM

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The MIC38HC45YM is a high performance and integrated voltage regulator DC-DC switching controller. It can reach up to 100 kHz switching frequency and provide a power rating of 500 MHz. It is highly integrated and includes a range of features to make it very cost-effective, such as a pulse-width modulation (PWM) engine, a synchronous rectification controller, an on-board output voltage reference, an on-board voltage supervisor, and a fully integrated logic supply.

Application of MIC38HC45YM

The MIC38HC45YM is commonly used in applications such as notebook and desktop personal computers, servers, information appliances, and industrial systems. It can be used as a system standby power supply, a power management and bus power control, or as a system reset processor. Additionally, it is widely used in automotive and industrial applications. It can be used for various power management tasks such as DC/DC and AC/DC conversion, battery charging, and voltage sequencing.

Overview of Working Principle

The MIC38HC45YM has an internal Pulse Width Modulation (PWM) controller, a synchronous rectification controller, a temperature compensation network, an on-board output voltage reference, a voltage supervisor, and an integrated logic supply. It also has an external frequency synchronizer to synchronize the PWM and synchronous rectification switching with the bus clock. The voltage supervisor monitors the external output voltage and provides several features such as fault detection and monitoring of the power supply.

The PWM controller regulates the output voltage based on the regulation method. The frequency of the switching for the PWM controller is determined by the FSYN pin. The frequency is synchronized to the bus clock. The PWM controller also monitors the fault conditions and shuts down the output pins when the fault conditions occur.

The synchronous rectification controller is responsible for driving the power MOSFETs in the synchronous rectification mode. The synchronous rectification controller regulates the gate drive signals of the high and low side MOSFETs. It starts in the voltage regulation mode and with the rate of increase of the output voltage, it switches to the synchronous rectification mode. The output voltage is further regulated by the PWM controller.

The temperature compensation network stabilizes the output voltage by providing accurate output voltage corrections over temperature. This helps in providing a reliable output voltage over the temperature range specified.

The on-board output voltage reference is an external voltage reference that provides an output voltage level between 5V and 8V. The voltage supervisor monitors the externally supplied voltage and provides several features such as fault detection and monitoring of the power supply.

Finally, the integrated logic supply provides the power to the switched mode power supply controller. This helps reduce overall system cost and power consumption, as it eliminates the need of an additional board for power supply.

Conclusion

The MIC38HC45YM is a high performance integrated voltage regulator DC-DC switching controller. It is commonly used in applications such as notebook and desktop computers, servers, and industrial systems. It has a range of features including a PWM engine, a synchronous rectification controller, an on-board output voltage reference, an on-board voltage supervisor, and an integrated logic supply. It is highly cost-effective and provides reliable performance in a wide range of applications.

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