LP2951-33DR
Low dropout voltage regulators for stable power management
Manufacturer： ['rochester', 'ti']
series introduction
# LP2951 - 33DR Product Series Introduction
## 1. Overview
The LP2951 - 33DR is a highly reliable and efficient low - dropout (LDO) voltage regulator product series. These regulators are designed to provide a stable output voltage in a wide range of applications, offering excellent performance in terms of voltage regulation, noise reduction, and power efficiency. The "33" in the model number indicates a fixed output voltage of 3.3V, which is a commonly used voltage level in modern electronic circuits, making it suitable for powering a variety of components such as microcontrollers, sensors, and other low - power integrated circuits.
## 2. Key Features
### 2.1 Low Dropout Voltage
One of the most significant features of the LP2951 - 33DR series is its low dropout voltage. Dropout voltage is the minimum voltage difference between the input voltage and the output voltage required for the regulator to maintain a stable output. The LP2951 - 33DR has a very low dropout voltage, typically in the range of a few hundred millivolts. This allows it to operate effectively even when the input voltage is only slightly higher than the desired output voltage. For example, in battery - powered applications, as the battery voltage gradually decreases over time, the low dropout characteristic ensures that the regulator can still provide a stable 3.3V output for a longer period, maximizing the battery's useful life.
### 2.2 High Output Voltage Accuracy
The LP2951 - 33DR offers high output voltage accuracy. It can maintain the output voltage within a tight tolerance band, typically ±2% or better. This high accuracy is crucial in applications where precise voltage levels are required for proper operation of the connected components. For instance, in precision analog circuits or digital systems with strict power supply requirements, the accurate output voltage of the LP2951 - 33DR ensures reliable and consistent performance.
### 2.3 Low Quiescent Current
Quiescent current is the current consumed by the regulator when there is no load or a very light load connected. The LP2951 - 33DR has a low quiescent current, which helps to reduce power consumption in standby or low - load conditions. This is especially important in battery - powered devices, as it helps to extend the battery life by minimizing the power drain when the device is not actively performing its main functions.
### 2.4 Thermal Shutdown and Current Limiting
To ensure the safety and reliability of the regulator and the connected components, the LP2951 - 33DR is equipped with thermal shutdown and current - limiting protection features. The thermal shutdown feature automatically turns off the regulator when the internal temperature exceeds a certain threshold, preventing damage due to overheating. The current - limiting feature restricts the output current to a safe level, protecting the regulator and the load from excessive current flow, which could otherwise cause damage.
## 3. Electrical Specifications
### 3.1 Input Voltage Range
The LP2951 - 33DR can operate over a wide input voltage range. Typically, the input voltage can range from a few volts above the output voltage (due to the low dropout requirement) up to a maximum specified value. For example, the input voltage may range from 3.6V to 26V, allowing it to be used in a variety of power supply scenarios, including those powered by batteries, wall adapters, or other power sources.
### 3.2 Output Voltage
As mentioned earlier, the LP2951 - 33DR provides a fixed output voltage of 3.3V. This output voltage is stable and accurate, with a low ripple and noise level, making it suitable for powering
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