LT3086ET7#PBF

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LT3086ET7#PBF Application Field and Working Principle

The LT3086ET7#PBF is a voltage regulator manufactured by Linear Technology and categorized under PMIC - Voltage Regulators - Linear. This regulator is a 3-terminal adjustable low dropout (LDO) regulator which works with input voltages up to 36V and provides output voltage adjustable down to 1.2V. It has a low dropout voltage of 300mV at high load current of 1.5A and low quiescent current of only 38μA. The LT3086ET7#PBF features an extremely low noise output and fast transient response, making it well suited for precision analog circuits and RF applications.

Features

• Input Voltage Range: 4V to 36V
• Output Voltage Range: 1.2V to 37V
• Output Current: 1.5A
• Dropout Voltage: 300mV at 1.5A Load
• Quiescent Current: 38μA
• Ripple Rejection: 75dB at 10Hz
• Reverse Voltages: -40V
• Reference Input Voltage: 2.5V

Working Principle

The LT3086ET7#PBF employs an internal PNP pass transistor, a series combination of two PNP transistors, to construct a low dropout regulator. The device is designed to maintain an accurate output voltage regardless of input voltage, load current, and temperature changes.

When the device is in operation and the output voltage is lower than the desired voltage, the voltage error amplifier senses this change and causes the output of the error amplifier to rise. This will increase the drive current to the internal PNP pass transistors that pass the load current through the feedback network and adjust the output voltage. When the voltage reaches the desired level, the output voltage will be regulated regardless of the current and temperature extremes.

The LT3086ET7#PBF is protected against short-circuits by limiting the internal pass transistor\'s on-state current when the output voltage is lower than the desired value. The device includes a thermal shutdown circuit that shuts down the regulator when the power dissipation exceeds a programmed limit. This ensures the device will not be damaged in the event of an over temperature situation.

Applications

The LT3086ET7#PBF can be used in various applications, including low noise power supplies, high dynamic range systems, and precision voltage supplies. It is also suitable for powering precision analog circuits such as A/D and D/A converters, and filtering circuits used in data communication applications. The device is also ideal for RF applications such as wireless communication, RF transceiver front ends, and front ends for digital signal processors.

Conclusion

The LT3086ET7#PBF is a highly efficient 3-terminal voltage regulator suitable for a range of applications including precision analog circuits, RF applications and low noise power supplies. With its low dropout voltage, quiescent current, and fast transient response, this voltage regulator provides excellent performance and is an excellent choice for a wide range of applications.

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