MC33289DWR2

MC33289DWR2 application field and working principle

Designers often require the use of advanced energy efficient power management functions to develop cost effective, reliable and energy efficient systems. The MC33289DWR2 is a specially designed integrated circuit (IC) developed by Freescale Semiconductor that offers advanced power management functions to meet the demands of today’s complex systems. It features various power management functions, including a 40 MHz dual channel switch mode converter, four low quiescent current low dropout (LDO) voltage regulators, FlexRay™ support and integrated power control logic. The MC33289DWR2 is suitable for automotive, industrial, and general purpose applications.

Overview

The MC33289DWR2 is a two-channel automotive electronic power switch IC that is used in a variety of automotive applications, such as battery management and audio systems. It integrates two 40-MHz power MOSFETs, two low dropout (LDO) regulators and four advanced power control logic circuits into a single unit. The dual-channel converter supports an input voltage range of 3.1 V to 8.7 V and provides output voltages of 1.2 V to 5.0 V.

The LDO regulators provide up to 500 mA of current while maintaining a very low quiescent current. The LDO’s output voltage can be adjusted to fit the needs of a wide range of applications. FlexRay™ support is included via a dedicated pin, enabling use of the IC with advanced audio systems. Additional features such as over-voltage and under-voltage protection, adjustable switching frequency and enable/disable capability ensure the MC33289DWR2 is an ideal solution for automotive, industrial and general purpose applications.

Working Principle

The MC33289DWR2 works by using two 40 MHz internal switch mode power transistors (MOSFETs). These MOSFETs are switched at a frequency of 40 kHz and a duty cycle of 50%, meaning half of the time the transistors are turned on and the other half of the time they are turned off. This switching of the transistors causes a control current to flow through the internal coil, generating an electromagnetic field. This field serves to open and close the internal contactors connecting the input voltage source to the output voltage.

The MC33289DWR2 features various protection circuits, including over-temperature protection and over-current protection. The over-current protection is designed to prevent the transistors from being damaged due to excessive current flow, while the over-temperature protection helps to prevent any damage to the IC due to overheating.

Additionally, the MC33289DWR2 includes four low quiescent current (LQC) LDO regulators. These low dropout (LDO) regulators maintain a very low quiescent current, providing up to 500 mA of current to their load. The output voltage can be adjusted to suit the application, providing a flexible solution for a variety of applications.

The MC33289DWR2 also includes FlexRay™ support via a dedicated pin, which allows the use of the IC with advanced audio systems. The IC also includes adjustable switching frequency and enable/disable capability, making it an ideal solution for automotive, industrial and general purpose applications.

Conclusion

The MC33289DWR2 is a special purpose integrated circuit designed by Freescale Semiconductor. It provides advanced power management functions and features such as FlexRay™ support, adjustable switching frequency, enable/disable capability, over-voltage, under-voltage and over-current protection. It is suitable for automotive, industrial and general purpose applications.