LM1086ILD-ADJ/NOPB

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Introduction

The LM1086ILD-ADJ/NOPB is a low dropout three-terminal adjustable regulator ideally suited for battery-powered systems where minimum supply current is critical. With an output voltage range from 1.2V to 37V, the device provides impedance matching for output voltage accuracy under changing load current conditions. The device provides stable output performance with extremely low dropout voltage and low quiescent current.

Applications

The LM1086ILD-ADJ/NOPB is specifically designed for use in portable and handheld electronic devices such as cellular phones, PDAs, digital cameras, MP3 players, DVD players, laptop computers, palmtops, and other battery-powered systems. This regulator is also suitable for automotive, industrial, and military applications. The device is available in the space-saving 8-pin SOIC package, with a maximum power dissipation rating of 500 mW.

Features

The LM1086ILD-ADJ/NOPB features include: exceptional load and line regulation, extremely low dropout voltage of 175 mV at 100 ma, ultra low quiescent current of 0.5 mA, adjustable output down to 1.2V, high PSRR of 45 dB, short circuit protection, and temperature-stable operation.

Working Principle

The LM1086ILD-ADJ/NOPB is a three-terminal adjustable regulator that offers good line and load regulation. It is capable of providing a stable output voltage over a wide range of input voltages and load currents. The device operates as a series adjustable linear regulator, whereby the output is regulated by controlling the internal series pass transistor.

If the output voltage of the LM1086ILD-ADJ/NOPB exceeds the desired level, current is drawn from the output load, creating a negative voltage (on the output) relative to the input voltage. This negative voltage is fed back to the error amplifier, which compares it to the reference voltage. The error amplifier then reduces the base current of the internal pass transistor, thereby reducing the output voltage.

On the other hand, if the output voltage is below the desired level, current is not drawn from the output load. The resultant higher voltage at the output compared to the input voltage is also fed back to the error amplifier, which increases the base current of the internal pass transistor, thus increasing the output voltage. The process of negative voltage feedback is repeated until the output voltage reaches the desired level.

Advantages

The LM1086ILD-ADJ/NOPB offers several key advantages, including low power dissipation and excellent line and load regulation. The device also has an effective output current and low noise. Furthermore, the device offers high PSRR, making it highly suitable for applications that require high accuracy, such as automotive and telecommunications.

Conclusion

The LM1086ILD-ADJ/NOPB is a low dropout, highly efficient linear voltage regulator that provides good line and load regulation in battery-powered systems. Its low dropout and very low quiescent current make it ideal for systems where minimum power consumption is critical. With its space-saving 8-pin SOIC package and adjustable output voltage range, the LM1086ILD-ADJ/NOPB is an ideal choice for portable and handheld electronic devices.

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