Part Number: MC34063ACD-TR

Manufacturer: STMicroelectronics

Description: IC REG BUCK BST ADJ 1.5A 8SO

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Technical Specifications of MC34063ACD-TR

Datasheet  MC34063ACD-TR datasheet
Category Integrated Circuits (ICs)
Family PMIC – Voltage Regulators – DC DC Switching Regulators
Manufacturer STMicroelectronics
Packaging Tape & Reel (TR)
Part Status Active
Function Step-Up, Step-Down
Output Configuration Positive or Negative
Topology Buck, Boost
Output Type Adjustable
Number of Outputs 1
Voltage – Input (Min) 3V
Voltage – Input (Max) 40V
Voltage – Output (Min/Fixed) 1.25V
Voltage – Output (Max) 38V
Current – Output 1.5A (Switch)
Frequency – Switching 100kHz
Synchronous Rectifier No
Operating Temperature 0°C ~ 70°C (TA)
Mounting Type Surface Mount
Package / Case 8-SOIC (0.154″, 3.90mm Width)
Supplier Device Package 8-SO

MC34063ACD-TR Description

The MC34063A/E series is a single-piece control circuit that does most of the work needed for DCDC voltage conversion. These functions include A temperature-compensated internal reference, a comparator, a duty cycle-controlled oscillator that includes an active current limit circuit, a driver, and a high current output switch, all of which are contained within the device. The output voltage can be changed by two external resistors with a reference accuracy range of 2%. The MC34063A/E device series is best for applications that need to step down, step up, or switch the voltage. It does this with as few external parts as possible.

MC34063ACD-TR Features

  • Output switch current above 1.5 A
  • 2 % reference accuracy
  • Low quiescent current: 2.5 mA (typ.)
  • Operating from 3 V to 40 V
  • Frequency operation to 100 kHz
  • Active current limiting

Frequently Asked Questions

● What is a switching regulator?

A switching regulator is a circuit that regulates the flow of energy from its input to its output by utilizing a power switch, an inductor, and a diode. Within a feedback control loop, a switching controller IC is responsible for turning the power switch on and off, typically a Field Effect Transistor (FET). This IC does this by monitoring the output of the switching regulator. This ensures that it will keep making the same amount of output even if used under normal conditions. In some switching regulators, the field effect transistor (FET) is a separate part outside the switching controller. In some implementations, the FET and controller are combined into a single integrated circuit.

● Why Not Use a Linear Regulator When You Can Use a Switching Regulator Instead?

In comparison to linear regulators, switching regulators have three primary advantages. To start, the switching efficiency can be significantly improved. Second, because the transfer of energy wastes less energy, the components can be made smaller, and the amount of thermal management needed can be reduced. Third, the energy stored by an inductor in a switching regulator can be turned into output voltages that are higher than the input voltage (boost), lower than the input voltage (inverter), or even transferred through a transformer to isolate the output voltage from the input voltage.

When you think about the benefits of switching regulators, you might wonder what linear regulators are good for. Linear regulators have less noise and a wider bandwidth than other types of regulators, and because of their simplicity, they are often times the less expensive option. There is no denying that switching regulators come with their share of drawbacks. They have the potential to be noisy and call for the management of energy in the form of a control loop, which calls for a switching controller. The good news is that the answer to these control issues can be found in the ICs used in today’s switching controllers.

Limitations of Voltage Regulators

  • In some applications, linear regulators can be inefficient due to the fact that they lose a significant amount of power as a byproduct of their operation. This is one of the most significant drawbacks associated with linear regulators. A linear regulator has a voltage drop that is analogous to the voltage drop that occurs across a resistor. For example, if the input voltage is 5V and the output voltage is 3V, then there will be a drop of 2V between the terminals, and the efficiency will only be able to reach 60% of what it could be. Because of this, linear regulators work best for applications that have relatively small differences between their VIN and VOUT voltages.
  • Since higher input voltages result in high power dissipation, which can overheat and damage components, it is important to consider the estimated power dissipation of a linear regulator in the application. This is because larger input voltages result in higher power dissipation.
  • In contrast to switching voltage regulators, linear regulators can only perform step-down, or “buck,” conversion. Switching regulators, on the other hand, can also perform step-up or boost, conversion, and buck-boost conversion. This is another disadvantage of linear regulators.
  • Switching regulators have a high level of efficiency. Still, they also have some drawbacks, including the fact that they are typically more expensive than linear regulators, that they are larger in size, that they have a higher level of complexity, and that they can generate more noise if the external components that they use are not carefully selected. Because noise can impact the operation and performance of circuits, in addition to EMI performance, noise can be of great significance for a given application.

Voltage Regulator Control

A pass transistor, an error amplifier, a voltage reference, and a resistor feedback network are the four primary components that make up a linear regulator. Two resistors (R1 and R2) are responsible for setting one of the inputs of the error amplifier so that it can monitor a certain percentage of the output voltage. The second input is a voltage reference that is constant (VREF). In the event that the sampled output voltage shifts in comparison to VREF, the error amplifier will adjust the resistance of the pass transistor in order to preserve the constant output voltage (VOUT).

Linear regulators are straightforward to implement because they typically require only an external input and output capacitor.

In contrast, the construction of the circuit for a switching regulator calls for a greater number of components. In order to generate charge packets that can be sent to the output, the power stage toggles between the VIN and ground terminals. An operational amplifier, which functions in a manner analogous to that of a linear regulator, takes a reading of the direct current output voltage from the feedback network and then evaluates it in relation to an internal voltage reference. After that, the signal of the error is amplified, then compensated, and finally filtered. The output is brought back into regulation by modulating the PWM duty cycle with this signal. For instance, if the load current suddenly increases, which results in a drop in output voltage, the control loop will raise the PWM duty cycle in order to supply more charge to the load and restore regulation to the rail.

Various Applications of Linear and Switching Regulators

In applications that are cost-sensitive, noise-sensitive, low-current, or space-constrained, linear regulators are frequently used. Consumer electronics such as headphones, wearables, and devices connected to the Internet of Things (IoT) are some examples. A linear regulator, for instance, could be used in applications such as a hearing aid because it does not contain a switching element, which is what could cause unwanted noise and interfere with the device’s performance.

If the creation of a low-cost application is the primary focus of the designers, then they do not need to be as concerned with the amount of power that is being dissipated and can instead rely on a linear regulator.

Final thoughts

This MC34063ACD-TR DC-to-DC converter from STMicroelectronics allows you to change the voltage of your devices from low to high. The maximum switch current for this device is 1.5 A. The maximum switching frequency you can use it at is 42 kHz. The temperature range in which this converter can function is between freezing and boiling.

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