MC33063ADRJR

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The MC33063A is a CMOS integrated circuit offering the flexibility to design a cost effective switching regulator power supply. It offers features that include low operating current, low standby current, and high efficiency. The MC33063A can be used to replace many conventional linear regulators, for the design of lower cost, lower power consumption and higher efficiency switching regulators. It thus provides the opportunity to create power supplies that can power a wide variety of applications, ranging from consumer products to industrial and automotive applications.

This device meets the requirements for electronic power conversion designs, for both AC and DC supplies, with its precision voltage reference, temperature compensated current limit, shutdown, PWM control, start-up power sequencing, and wide input/output voltage ranges, making it an ideal choice for designers seeking an all-in-one, cost-effective and reliable power management solution.

Application Field

The MC33063A is the semiconductor manufacturer’s most efficient, simple and cost effective, DC-DC converter. This chip has found its place in a wide range of markets, such as: Automotive, industrial, telecom, consumer and Audio/video. It is used in DC-DC converters to provide switch mode power supplies such as a step up, step down, or inverting buck-boost regulator.

For automotive applications, this device is commonly used in starter motors, electric motors, and related applications. The MC33063A is also an ideal solution for boost converters, automotive air-conditioner systems, and electric power steering. In industrial applications, the device can be used in battery operated and AC applications such as laboratory electronics, low cost inverters, and active power factor correction circuits.

The MC33063A is also gaining popularity in consumer products because of its power-saving feature and its ability to maintain high efficiency even with low input voltages. It can be used in products ranging from fax machines, printers and modems to digital cameras, vacuum cleaners and electric toys. Further, the device has great audio and video uses with its ability to provide clean power required for these applications.

Working Principle

The MC33063A is an integrated, switch mode power conversion IC with minimum external components. It is suited for use as a general-purpose converter and is designed for constant switching frequency of up to 100kHz.

The MC33063A chip has two operational modes: the linear mode (continuous mode) and the latch, or switching, mode. In linear mode, the chip is capable of supplying a steady output current to the load in response to a given duty cycle. In this mode, the power delivered to the load is increased until the duty cycle reaches 100%, and then it is reduced. However, as the duty cycle increases, the output current decreases, suggesting the power is being wasted or dissipated.

The MC33063A is capable of operating up to 100kHz switching frequency, known as latch mode. This results in higher efficiency as the current to the load is properly regulated, depending on the duty cycle of the switching rather than the power dissipation. The MC33063A also has an enable circuit to maintain the latch enable output as long as the output voltage is lower than the programmed level.

The MC33063A offers full protection of the output voltage and temperature with the use of a thermal shutdown. This is performed by a temperature compensated current limit of up to 8.2 A and the soft start feature helps further reduce the inrush current at startup. Pulse-by-pulse current limit is also provided for accurate peak current control.

The MC33063A has many versatile features to ensure power efficiency. With its accurate internal reference, a 0.6% voltage regulation is achievable. Fault protection against over voltage, under voltage, over temperature and overcurrent is also provided.

The MC33063A is an effective, cost-efficient and reliable solution for powering a wide range of applications. It is well suited for the automotive, industrial and consumer markets and its high switching rate contributes to the overall efficiency and power savings.

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