MC33907AE

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The MC33907AE is a specialised voltage regulator designed to provide robust power management in automotive, industrial and other frequent harsh environments. The MC33907AE offers simultaneous synchronous rectification to reduce power losses, integrated high and low-side MOSFETs to reduce component count, and protected outputs for improved reliability. In this article, we’ll take a look at the MC33907AE application field and working principle.

Application Field

The MC33907AE is aimed at providing power management solutions in applications such as industrial motor drives, distributed power systems, automotive motor control, point-of-load regulators, battery management systems and more. Core use-cases of the MC33907AE are motor control, power distribution, and line-side protection.

The MC33907AE integrates high-side, low-side and gate drivers allowing it to control and manage power from high-current applications up to 10A continuous. It also integrates a low quiescent current buck converter, with both voltage (0.9V to 5.5V) and current (0.4A to 5A) monitoring available. Protection is provided by an integrated over-current protection (OCP), overtemperature protection (OTP), and overvoltage protection (OVP). Additionally, the MC33907AE offers selectable PWM frequency up to 2 MHz, with adjustable gate resistor for accurate gate control.

Working Principle

The MC33907AE works by using synchronous rectification of a buck converter. In a buck converter, alternating current (AC) is converted to direct current (DC) by switching a DC voltage with an inductor and a capacitor (known as an LC circuit). In this circuit, inductor current is switched on and off, to control the output voltage. This is done by the Arduino board.

The MC33907AE uses the difference between the input voltage and the voltage across the inductor to drive the MOSFETs. When the MOSFET is connected, the inductor will be charged with current, which is then fed to the output buffer circuit. When the load decreases, the MOSFET will be disconnected, thus releasing the energy stored in the inductor and in turn controlling the output voltage.

The MC33907AE provides protection against both over-voltage and over-current scenarios. The overvoltage protection (OVP) is designed to limit the output voltage, while the over-current protection (OCP) is designed to turn off the MOSFETs when the load reaches the peak current. The device also integrates an overtemperature protection (OTP), which turns off the outputs if the internal temperature exceeds a certain limit.

The MC33907AE also features selectable PWM frequency up to 2 MHz, adjustable gate resistance, integrated gate drivers and low quiescent current consumption. It makes the MC33907AE an excellent choice for applications that require robust power solutions, such as automotive motor control, power distribution, line-side protection and more.

Conclusion

The MC33907AE is a specialised voltage regulator designed to provide robust power solutions for industrial and automotive applications. It integrates high and low-side MOSFETs, synchronous rectification, overcurrent, overvoltage and overtemperature protection, adjustable gate resistance, selectable PWM frequency, and low quiescent current. All these features make the MC33907AE an ideal choice for applications that require robust power solutions.

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