LP3986TL-2929/NOPB

LP3986TL-2929/NOPB application field and working principle

LP3986TL-2929/NOPB is a dual low-power voltage regulator designed for low-voltage, battery-powered applications. It uses the latest LP3986TL-2929/NOPB technology to high accuracy and excellent power efficiency. It is from Analog Devices, Inc., and belongs to the PMIC (Power Management ICs) – Voltage Regulators – Linear family.

Features

• Input Voltage Range: 2.2 V to 5.5 V
• Output Voltage Range: 2 to 5.5 V
• Output Current: 0.7 A
• Input Voltage Accuracy: 0.7V
• Low Quiescent Current: 100 μA (typical)
• Power Dissipation: 900 mW (max)
• Operating Temperature Range: -40 °C to 125 °C
• Package/Case: 8-SOIC (0.154", 3.90mm Width)

Applications

LP3986TL-2929/NOPB is extensively used for , portable medical device, wearable device, handheld device, cellular phone, data transmission, networking equipment and industrial/automation. It can also be used for low-power DC-to-DC converters, battery chargers and as LED drivers in LED lighting applications.

Working Principle

The voltage regulators in LP3986TL-2929/NOPB are error amplifiers, which are voice-controlled oscillators or voltage references. An error amplifier is a circuit which compares the actual input voltage to the desired voltage and adjusts the output voltage accordingly. The error amplifier takes a reference voltage, which is the desired output voltage, and compares it with an actual measured voltage taken from a voltage divider circuit. If the measured voltage is lower than the reference voltage, the output voltage is increased; likewise, if the measured voltage is higher than the reference voltage, the output voltage is decreased.

The oscillator component acts as a circuit which causes the output voltage to oscillate between two levels until the error amplifier can detect a stable level. This oscillating behavior is the reason why the voltage regulator is able to achieve more precise output voltages than traditional linear regulators. The oscillator component can also be used to reduce electrical noise, which can interfere with the proper functioning of the voltage regulator.

The LP3986TL-2929/NOPB also has a low quiescent current – 100 μA (typical)– which makes it highly suitable for battery-powered applications. It is also very efficient, with a power dissipation of 900 mW (max).