LM3489MM

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The LM3489MM is a versatile dc-dc switching controller primarily designed for high-performance non-isolated synchronous-rectified buck converter applications. This device is unique in its ability to operate with a wide input voltage range, with an optional current-limited external P-channel MOSFET, and a low-power start-up circuit. Its operating frequency can be adjusted by connecting an external resistor. The device also supports output voltage tracking in a master/slave topology.

Application Fields

The LM3489MM is a versatile solution that can be used as a principal dc-dc switching controller in various second stage non-isolated synchronous-rectified buck topologies of an intermediate bus voltage. The device package offers some unique features that make it ideal for these applications:

• Ultra-wide input voltage range operating at 4 V to 36 V.
• External current limit MOSFET option (which avoids the need for an additional current sensing resistor).
• Output voltage tracking in a master/slave topology.
• Low power start-up circuit.
• Programmable frequency synchronous-rectified buck converter.

Working Principle

The LM3489MM is a dc-dc switching controller designed for use in non-isolated synchronous-rectified buck topologies of a intermediate bus voltage. As a main dc-dc switching controller, the device can realize the basic loop closed operation with the help of an external MOSFET. It adjusts the current flowing through the external MOSFET, and in this way it regulates the output voltage. At the same time, the LM3489MM monitors and controls the current through the external MOSFET, as well as the load current, ensuring that the desired current levels are maintained. By adjusting the duty cycle of the switching signal, the LM3489MM is able to maintain a constant load voltage, regardless of the changes in input voltage.

Special features of the LM3489MM are its low power start-up circuit, and its ability to operate with a wide range of input voltage. The low power start-up circuit allows the device to be used in applications that require extremely low power consumption, such as battery-powered systems. The wide input voltage range operation allows the device to be used in applications that require high input voltage levels, such as automotive applications.

The LM3489MM also features an optional current-limit MOSFET, which avoids the need for an additional current sensing resistor. This option can be used to limit the peak current going through the MOSFET, thus protecting the device from excessive current in case of a fault. In addition, the output voltage can be tracked in a master/slave topology, allowing the device to regulate multiple outputs simultaneously.

Conclusion

The LM3489MM is a flexible and versatile dc-dc switching controller designed primarily for use in non-isolated synchronous-rectified buck applications. This device offers some unique features that make it ideal for these applications, such as its wide input voltage range operation, optional current-limited external P-channel MOSFET, and low power start-up circuit. The device is also able to track output voltage in a master/slave topology, and its operating frequency can be adjusted by connecting an external resistor. As such, the LM3489MM is a valuable solution for a diverse range of second stage dc-dc applications.

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