Motorola, Inc. MC33063AD

of MC33063AD The Motorola MC33063AD is a DC-DC converter that functions primarily as a step-up (boost), step-down (buck), or inverter converter. It is designed for use in power supply applications, providing regulated output voltages from a variety of input voltage sources. The IC is characterized by a high efficiency, simple design, and minimal external components. Functions 1. Step-Up Conversion (Boost): Increases the input voltage to a higher output voltage. 2. Step-Down Conversion (Buck): Decreases the input voltage to a lower output voltage. 3. Inverting Conversion: Provides an output voltage that is negative with respect to the input voltage. 4. Adjustable Output Voltage: Allows for the output voltage to be set through external resistors. 5. Overcurrent Protection: Integrated current limiting features protect against overload conditions. Applications - Battery-powered devices - Power supply circuits in portable electronics - Power management in industrial equipment - Charging circuits for rechargeable batteries - Equipment requiring voltage regulation from a fluctuating power supply Alternative Parts 1. LM2575: A simple switching regulator available in adjustable output versions. 2. LM2596: A step-down voltage regulator that offers higher current capability. 3. MC34063: An older but functionally similar DC-DC converter. Embedded Modules Embedded modules containing similar functions may include DC-DC converter modules in different packages or formats and might use the MC33063AD as the core component. Many development boards or power supply modules are available that utilize the MC33063AD for prototyping and testing purposes. Q&A Q1: What are the input voltage range and output voltage settings for the MC33063AD? A1: The MC33063AD supports an input voltage range from 3V to 40V, and the output voltage can be adjusted from 1.25V to 37V, depending on the configuration and external resistors used. Q2: How efficient is the MC33063AD in a typical application? A2: The efficiency of the MC33063AD varies depending on the load and configuration but can be up to about 80% or more in optimal conditions when designed properly. Q3: What external components are needed for implementing an MC33063AD circuit? A3: The typical external components for an MC33063AD circuit include an inductor, capacitors, diodes, and resistors for setting the output voltage and feedback. Q4: Can the MC33063AD be used for charging lithium-ion batteries? A4: Yes, the MC33063AD can be used in circuits designed for charging lithium-ion batteries, but care must be taken to ensure that the output voltage and current match the requirements of lithium-ion battery charging. Q5: How does the MC33063AD handle overcurrent conditions? A5: The MC33063AD includes built-in current limiting features to protect against overcurrent conditions. If the current exceeds the set threshold, the output transistor will be turned off periodically until the overload condition is cleared.