MC33063AVP

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The MC33063AVP is a DC-DC switching regulator available in on-chip, adjustable or fixedstep-down voltage output versions. It is designed for automotive applications and is well suited for use in battery-powered lower-power applications such as portable radios, CD players and other battery-powered consumer electronics. The MC33063AVP operates from an input voltage range of 4.5 V to 40 V and features a 0.3 A maximum peak switch current rating.

Applications:

• On-board battery powered applications
• Adjustable and fixed output regulated power supplies
• Low cost, low power consumption portable electronics
• Battery chargers

Working principle:

The MC33063AVP switching regulator works by taking a current from the input voltage, then "chopping" it up into short bursts of steady current and delivering them into the output circuit. In order to regulate the output voltage, it must accurately control the chopping rate and the duration of each burst. This is done by comparing the output voltage to an internal DC reference voltage and then adjusting the chopping rate accordingly. For a given output current, a longer chopping cycle will result in a higher output voltage.

The MC33063AVP regulates the chopping frequency by using an on-chip oscillator. The oscillator frequency can be adjusted by changing a capacitor connected to the oscillator input. This allows the output voltage to be regulated over a wide range. The MC33063AVP also includes a thermal protection circuit that will automatically shut down the device if the internal temperature exceeds a predetermined limit.

The MC33063AVP also contains several protective features, including undervoltage lockdown which will protect the controller from unstable input voltages, as well as an impending overload indication which will alert the user of overload conditions. This overload indication can be used as part of an system that monitors the current level and then shuts down the controller if an overload is imminent.

The MC33063AVP is a low cost, low noise, low power device and is ideal for applications such as portable radios, CD players and other battery-powered consumer electronics. The MC33063AVP is also well suited for use in automotive applications, thanks to its wide input voltage range, low noise and protection features.

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