ADP7118ARDZ-5.0 vs MIC2940A-12WU
| Part Number |
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| Category | PMIC - Voltage Regulators - Linear | PMIC - Voltage Regulators - Linear |
| Manufacturer | Analog Devices Inc. | Microchip Technology |
| Description | IC REG LINEAR 5V 200MA 8SOIC | IC REG LINEAR 12V 1.25A TO263-3 |
| Package | Cut Tape (CT) | -Reel® |
| Series | - | - |
| Operating Temperature | -40°C ~ 125°C (TA) | -40°C ~ 125°C |
| Mounting Type | Surface Mount | Surface Mount |
| Package / Case | 8-SOIC (0.154\", 3.90mm Width) Exposed Pad | TO-263-4, D²Pak (3 Leads + Tab), TO-263AA |
| Supplier Device Package | 8-SOIC-EP | TO-263-3 |
| Output Type | Fixed | Fixed |
| Voltage - Output (Min/Fixed) | 5V | 12V |
| Voltage - Output (Max) | - | - |
| Current - Output | 200mA | 1.25A |
| Output Configuration | Positive | Positive |
| Control Features | Enable, Soft Start | - |
| Voltage - Input (Max) | 20V | 26V |
| Number of Regulators | 1 | 1 |
| Voltage Dropout (Max) | 0.42V @ 200mA | 0.6V @ 1.25A |
| Current - Quiescent (Iq) | 140 µA | 500 µA |
| Current - Supply (Max) | 320 µA | 70 mA |
| PSRR | 88dB ~ 50dB (10kHz ~ 1MHz) | - |
| Protection Features | Over Current, Over Temperature | Over Current, Over Temperature, Reverse Polarity |
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1. What problems will linear regulators bring to the circuit?
The problems that linear regulators bring to the circuit mainly include low efficiency and a lot of heat.
Linear The main working principle of the voltage regulator is to control the output voltage of the transistor through a current amplifier to keep the output voltage stable. This working mode causes the linear regulator to control the regulating tube through a differential voltage when adjusting the output voltage. The control tube needs to absorb part of the input voltage, which makes the efficiency of the linear regulator relatively low. In practical applications, this means that the linear regulator will convert the difference between the input voltage and the output voltage into heat energy, causing serious heating of the device, especially when the input and output voltage difference is large, this power loss will further increase, causing the device to heat up. -
2. What is the difference between a linear regulator and a resistor?
Linear regulators and resistors have significant differences in function, working principle and application scenarios.
Function and working principle:
A linear regulator is an electronic device that achieves a stable voltage output by adjusting linear elements (such as resistors, transistors, etc.) in the circuit. It uses the negative feedback principle. When the input voltage changes, the regulator senses this change and adjusts the parameters of the circuit elements (such as the resistance value or the conduction state of the transistor) accordingly to keep the output voltage stable within the required range. Linear regulators can provide lower output noise and fluctuations, and have better responsiveness to load changes.
Resistors are a basic electronic component used to limit current and divide voltage. It works by hindering the flow of current, has a fixed resistance value, and does not have the function of adjusting the output voltage.
Application scenarios:
Linear regulator -
3. Can a linear regulator be up?
Linear regulators cannot be boost.
The main function of a linear regulator is to stabilize the output voltage, protecting the electrical equipment from high or unstable voltage effects. It realizes a stable output voltage by adjusting the gap between the output voltage and the input voltage, but this process is limited to lowering the voltage, not including the voltage. The working principle of a linear regulator is to regulate the voltage by converting excess voltage into heat loss, thereby realizing the voltage regulation. This feature determines that it does not have the voltage function. -
4. What are the two main categories of linear and switching stabilizers?
The two main categories of linear and switching stabilizers are linear voltage voltage power and switching voltage power supply.
Linear voltage voltage power has achieved the advantages of transformer, rectification, filtering, and voltage voltage. It has the advantages of good stability, fast transient response speed, high reliability, and high output voltage accuracy. However, its transformation efficiency is low, especially when the output voltage difference is large, if the output current is also large, there will be obvious fever and hot phenomenon, and may even burn the regulator. The linear voltage voltage power supply includes two types: fixed output voltage and adjustable output voltage. According to the selection of the output current and the difference in the input output voltage difference, the design of the linear regulator needs to pay attention to the heat dissipation problem and the choice of bypass capacitors.
The switching voltage voltage power supply, also known as
