MIC3839BMM-TR

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Power Management Integrated Circuit (PMIC) are increasingly being used in systems where high power and high integration are desired. Recently, Synopsys unveiled it\'s latest innovation, the MIC3839BMM-TR, a DC-DC switching controller designed to provide high-efficiency power supply solutions. This application note describes the Micrel MIC3839BMM-TR’s application field, its operation principles and how to use it.

The MIC3839BMM-TR was designed for use in switching voltage regulator applications, which regulate the output voltage of a module or system. It is well suited for a variety of applications, such as high-current power supplies and synchronous rectification circuits. The device features a highly efficient, reliable, multi-mode control architecture that helps reduce system cost and power dissipation.

The MIC3839BMM-TR is capable of regulating the input voltage to plus or minus 0.2% of the regulation voltage. The integrated MOSFET driver allows for a fast switching speed and high efficiency, while the extended output voltage range of 0.6V to 4.0V make it suitable for a wide range of applications. The MIC3839BMM-TR also offers a low system control voltage, making it ideal for battery powered systems with limited input voltage.

The MIC3839BMM-TR is a simple and reliable solution for low output voltage, high current power supply designs. It is suitable for applications where quick and precise voltage regulation is desired while keeping a small form factor and low power consumption, as it runs at a wide input voltage range from 4.5V to 25V, and requires no external sense or compensation components.

The MIC3839BMM-TR is a DC-DC switching controller with an integrated MOSFET driver, offering a wide range of load current capability, up to 2A. The device also features high efficiency, wide switching frequency range and a low ramp-up time for output voltage regulation. The device allows for high current flow with low power consumption and a very low EMI profile.

The controller also features an active on-time limiting of the MOSFET drive current, which allows it to regulate the output voltage while maintaining optimal efficiency under light loads. Additionally, it provides over temperature protection and current sense circuit.

The internal operating principle of the MIC3839BMM-TR is simple. It operates by using a buck converter topology, with an externally adjustable current limit formed by the current sense circuit connected at the MOSFET source node, and an input voltage connect to the MOSFET gate. The device regulates the output voltage to the desired value, by adjusting the pulsed-width of the MOSFET, while allowing the output current to vary with the input and load voltage values.

The MIC3839BMM-TR also offers a variety of adjustable settings. These settings program the parameters of the internal circuitry, such as the switching frequency, current limit and output voltage. The device can be programmed, via an external resistor, to run at frequencies up to 4MHz, and can also be programmed to operate in a soft-start mode, which helps reduce output voltage ripple. The current limit settings can be adjusted to the desired limits, and the output voltage can be programmed in steps of 0.2V.

The MIC3839BMM-TR is a versatile DC-DC switching controller, which offers a high level of integration and reliability. The device is well suited for a variety of applications, such as high-current power supplies and synchronous rectification circuits. With its extended output voltage range of 0.6V to 4.0V, and its highly efficient, multi-mode control architecture, the MIC3839BMM-TR is the ideal choice for power supply regulation.

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