BD4271FP2-CE2 vs LT3062EMS8E-5#PBF
| Part Number |
|
|
| Category | PMIC - Voltage Regulators - Linear | PMIC - Voltage Regulators - Linear |
| Manufacturer | Rohm Semiconductor | Analog Devices Inc. |
| Description | IC REG LINEAR 4.9V 550MA TO263-7 | IC REG LINEAR 5V 200MA 8MSOP |
| Package | Cut Tape (CT) | Tube |
| Series | Automotive, AEC-Q100 | - |
| Operating Temperature | -40°C ~ 150°C (TJ) | -40°C ~ 125°C |
| Mounting Type | Surface Mount | Surface Mount |
| Package / Case | TO-263-8, D²Pak (7 Leads + Tab), TO-263CA | 8-TSSOP, 8-MSOP (0.118\", 3.00mm Width) Exposed Pad |
| Supplier Device Package | TO-263-7 | 8-MSOP-EP |
| Output Type | Fixed | Fixed |
| Voltage - Output (Min/Fixed) | 4.9V | 5V |
| Voltage - Output (Max) | 5.1V | - |
| Current - Output | 550mA | 200mA |
| Output Configuration | Positive | Positive |
| Control Features | Enable | Soft Start |
| Voltage - Input (Max) | 45V | 45V |
| Number of Regulators | 1 | 1 |
| Voltage Dropout (Max) | 0.5V @ 300mA | 0.53V @ 200mA |
| Current - Quiescent (Iq) | 150 µA | 90 µA |
| Current - Supply (Max) | - | 10 mA |
| PSRR | 60dB (120Hz) | 70dB (120Hz) |
| Protection Features | Over Current, Over Temperature, Short Circuit | Over Current, Over Temperature, Reverse Polarity |
-
1. What are the disadvantages of linear regulators?
The disadvantage of linear regulators is that they are not efficient and can only be used in voltage reduction applications. The efficiency of a linear regulator depends on the ratio of output voltage to input voltage: turbidity = Vo: Vi. For example, for ordinary linear regulators, when the input voltage is 5V and the output voltage is 2.5V, the efficiency is only 50%. For ordinary linear regulators, about 50% of the electrical energy is converted into "heat" and lost, which is also the main reason why ordinary linear regulators are prone to heat when working. For LDO, due to its low voltage difference, the efficiency is much higher. For example, when the input voltage is 3.3V and the output voltage is 2.5V, its efficiency can reach 76%. Therefore, in LCD color TVs, in order to improve the utilization rate of electrical energy, ordinary linear regulators are used less, while LDOs are used more.
-
2. 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. -
3. What is the minimum input voltage of a linear regulator?
The minimum input voltage range of linear regulator varies from model and application.
For certain low -voltage lower -voltage regulators, its minimum input voltage range is usually 2.5V to 2.7V. This type of regulator design is used to power the internal LDO drive circuit and can drive PMOS FET to provide high output current. However, when the output voltage is lower than 1.8V and the output current is greater than 2.5A, the linear regulator with PMOS bypass components may be used for external heat dissipation due to additional air flow requirements and/or the heat generated by the regulator. It becomes inconvenient and the cost will increase.
For universal linear stabilizers, its input voltage range can be very wide. For example, some general -purpose linear regulators have 3V to 40V input voltage range. Even for models suitable for 24V systems, the input maximum voltage can reach 60V Then, then
In summary, the minimum input voltage of the linear regulator does not have a fixed st -
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
