ADP7118ARDZ-5.0 vs LT1762EMS8-3#PBF
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| Category | PMIC - Voltage Regulators - Linear | PMIC - Voltage Regulators - Linear |
| Manufacturer | Analog Devices Inc. | Analog Devices Inc. |
| Description | IC REG LINEAR 5V 200MA 8SOIC | IC REG LINEAR 3V 150MA 8MSOP |
| Package | Cut Tape (CT) | Tube |
| 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 | 8-TSSOP, 8-MSOP (0.118\", 3.00mm Width) |
| Supplier Device Package | 8-SOIC-EP | 8-MSOP |
| Output Type | Fixed | Fixed |
| Voltage - Output (Min/Fixed) | 5V | 3V |
| Voltage - Output (Max) | - | - |
| Current - Output | 200mA | 150mA |
| Output Configuration | Positive | Positive |
| Control Features | Enable, Soft Start | Enable |
| Voltage - Input (Max) | 20V | 20V |
| Number of Regulators | 1 | 1 |
| Voltage Dropout (Max) | 0.42V @ 200mA | 0.4V @ 150mA |
| Current - Quiescent (Iq) | 140 µA | - |
| Current - Supply (Max) | 320 µA | - |
| PSRR | 88dB ~ 50dB (10kHz ~ 1MHz) | 65dB (120Hz) |
| Protection Features | Over Current, Over Temperature | Over Current, Over Temperature, Reverse Polarity |
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1. What are the characteristics of linear regulators?
Linear regulators have the characteristics of low cost, small package, few peripheral devices and low noise. There are many types of linear regulator packages, which are very suitable for use in LCD color TVs. For fixed voltage output applications, only 2-3 small capacitors are needed to form the entire solution. Ultra-low output voltage noise is the biggest advantage of linear regulators. The output voltage ripple is less than 35V (RMS), and it has an extremely high signal-to-noise control ratio, which is very suitable for powering small signal processing circuits that are sensitive to noise.
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2. What is the difference between linear regulators and switching regulators?
There are significant differences between linear regulators and switching regulators in terms of working principles, efficiency, stability, cost and application range.
Working principle:
Linear regulators achieve the function of stabilizing the output at a set value by adjusting the voltage difference between the output voltage and the input voltage. It achieves stable output voltage by controlling the conductivity state of the power transistor.
The switching regulator converts the input voltage into a pulse signal transmission and smoothes the output through a filter by quickly switching between the input and output ends to achieve the function of stabilizing the output at the set value. The switching regulator uses PWM (pulse width modulation) control to control the output voltage by adjusting the time duty ratio of the high and low levels within a cycle.
Efficiency:
The efficiency of the linear regulator is relatively low, usually between 60% and 70%. When the voltage differenc -
3. 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. -
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
