LT3081EDF#PBF

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LT3081EDF#PBF Application Field and Working Principle

The LT3081EDF#PBF, which stands for Linear Technology Low Dropout Fixed Regulator, is a high-performance CMOS voltage regulator with fixed output voltages. It is typically found in personal computers, wearable devices, medical instruments, and many other industrial applications.

The LT3081EDF#PBF is specifically designed for low power applications, such as notebook and handheld computers, cellular telephones, radios, and digital cameras. In these applications the regulator is used to reduce power consumption and improve overall product design. Not only does it require low input and output voltages, but it also has a low quiescent current draw, a fast transient response, a high power-supply rejection ratio, and excellent line regulation.

Features

• Wide input-voltage range: 3.2V to 20V
• Fixed output voltages: 0.8V, 1.1V, 1.5V, 1.8V, 2.4V, 2.6V, 2.7V, 3.3V, 3.8V, 4.3V, 5.0V, 5.3V, 5.4V, 5.6V
• Low quiescent current: 8 mA Typical
• Low dropout voltage: 40mV Typical
• High power-supply rejection ratio: 90 dB Typ
• Thermal shutdown protection

Working Principle

The LT3081EDF#PBF voltage regulator has an internal voltage reference and power switch that can provide excellent regulation over a wide input voltage range. The current regulation circuit consists of the power switch, a current sensing resistor, the error amp, and an external compensation capacitor. The voltage regulator is designed to operate from an input voltage higher than the set output voltage.

When the input voltage increases so does the current through the load and the current sensing resistor. This current is summed with the current through the internal reference circuit which sets a base output voltage. The error amplifier then compares the actual output voltage to the set voltage and increases the output voltage if necessary. The external compensation capacitor filters the output voltage noise, providing stability for the voltage regulator.

Under normal conditions, the switch will remain on and maintain a regulated output voltage. If the load current or the input voltage is too high, the switch will be disabled and the output voltage will drop. Furthermore, the switch is designed to protect the regulator from thermal or overcurrent overloads. If the temperature or the current exceeds certain thresholds, the switch will shut off and the regulator will enter a safe mode.

Applications

The LT3081EDF#PBF is a high performance CMOS voltage regulator that is designed for low power applications. It is typically found in personal computers, wearable devices, medical instruments, and many other industrial applications. It also provides excellent line and load regulation, low dropout voltage, and low quiescent current draw.

The LT3081EDF#PBF is used to reduce power consumption and improve product design. It can be used in a variety of power management applications such as powering peripheral devices, powering portable electronics, and supplying regulated outputs. It is also suitable for battery powered systems as it provides an excellent line and load regulation over wide input voltage ranges. Thanks to its low quiescent current draw and low dropout voltage, the LT3081EDF#PBF is an ideal choice for powering the latest low-power portable electronics.

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