LP3874EMP-1.8
Ultra low-dropout linear regulators for precise voltage control in electronics
Manufacturer： ['national-semiconductor', 'ti']
series introduction
# Introduction to the LP3874EMP - 1.8 Product Series
## 1. Overview
The LP3874EMP - 1.8 is a highly specialized and reliable product within the realm of power management integrated circuits (PMICs). It belongs to a series of low - dropout (LDO) voltage regulators, designed to provide a stable and precise output voltage in a wide range of electronic applications. The "1.8" in its name indicates that it is configured to deliver a fixed output voltage of 1.8 volts, which is a common requirement for many modern electronic components such as microcontrollers, digital signal processors (DSPs), and various integrated circuits.
## 2. Key Features
### 2.1 Low Dropout Voltage
One of the most significant features of the LP3874EMP - 1.8 is its low dropout voltage. Dropout voltage is the minimum difference between the input voltage and the output voltage required for the regulator to maintain a stable output. A low dropout voltage allows the regulator to operate efficiently even when the input voltage is only slightly higher than the desired output voltage. This is particularly useful in battery - powered applications, where the battery voltage decreases over time. For example, in a portable device powered by a single lithium - ion battery, which has a nominal voltage of 3.7V but can discharge down to around 2.7V, the LP3874EMP - 1.8 can still provide a stable 1.8V output with its low dropout characteristic.
### 2.2 High Output Accuracy
The LP3874EMP - 1.8 offers high output voltage accuracy. It can maintain the output voltage within a tight tolerance band, typically within ±1% or even better. This high accuracy is crucial for applications that require precise voltage levels to ensure the proper operation of sensitive electronic components. For instance, in a high - performance analog - to - digital converter (ADC), a stable and accurate 1.8V supply voltage is necessary to achieve accurate signal conversion and measurement.
### 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 to the output. The LP3874EMP - 1.8 has a low quiescent current, which helps to conserve power in battery - powered systems. In standby or idle modes, where the load current is minimal, the low quiescent current ensures that the battery life is extended. This makes it an ideal choice for applications such as wearable devices, wireless sensors, and other low - power electronics.
### 2.4 Thermal Protection
To prevent damage due to overheating, the LP3874EMP - 1.8 is equipped with thermal protection circuitry. When the temperature of the device exceeds a certain threshold, the thermal protection mechanism automatically reduces the output current or shuts down the regulator to prevent further temperature rise. This feature enhances the reliability and durability of the product, especially in applications where the device may be exposed to high - temperature environments or experience high power dissipation.
### 2.5 Short - Circuit Protection
The product also includes short - circuit protection. In the event of a short - circuit at the output, the regulator limits the output current to a safe level, preventing excessive current flow that could damage the device or other components in the circuit. This protection feature adds an extra layer of safety and reliability to the system.
## 3. Applications
### 3.1 Mobile Devices
In smartphones, tablets, and other mobile devices, the LP3874EMP - 1.8 can be used to power various subsystems such as the CPU, GPU, and memory modules. Its low dropout voltage and high output accuracy ensure stable power supply, while the low quiescent current helps
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