LP2985IM5-3.6

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LP2985IM5-3.6 is a modern, low power, low dropout voltage regulator from National Semiconductor. It is part of the National Semiconductor low-power offerings of low-dropout (LDO) voltage regulators, which feature improved power consumption. This particular device is rated for up to 3.6V of output, and has several features which make it particularly well-suited for applications where power management is a priority.

Application Field

LP2985IM5-3.6 is typically used in low power applications, medical electronics, micro controllers, handhelds and notebooks. Its competitive advantages are the extremely low dropout voltage and quiescent current, and the wide input voltage range. These features make it ideal for powering microprocessors and other devices that draw high currents from small power supplies.

Additionally, the low quiescent current makes the device very attractive for portable and battery-operated equipment. Its wide input voltage range (2.5V to 6.0V) offers flexibility for the designer and helps to comply with standard input voltage requirements.

The device is also well suited for automotive applications, as it offers reverse voltage protection and reversed-battery protection features.

Working Principle

The LP2985IM5-3.6 is a traditional three-terminal, low dropout linear voltage regulator. The device operates by converting the source supply voltage V_IN to a regulated voltage V_OUT at the output. To ensure a precise output voltage, the regulator includes two precision voltage reference sources which are used to compare the actual output voltage with the desired set point.

The device has a maximum rated output current of 600mA. The output voltage is adjustable, which allows the device to be used in a wide variety of applications.

The device features on-chip thermal shutdown protection, which limits the output current if its temperature rises above a predetermined threshold. This feature is important in automotive applications, as it protects the regulator from being damaged by high temperatures.

The device also includes protection against overload conditions, such as short circuits, as well as reverse-battery protection to ensure proper operation in the event of an accidental installation of the battery in reverse.

Conclusion

LP2985IM5-3.6 is a three-terminal linear voltage regulator from National Semiconductor which offers excellent performance and reliability for low power applications. It is designed for use in medical electronics, micro controllers, handhelds, notebooks, and automotive applications. The device offers a wide input voltage range, low quiescent current, high output current, reverse voltage protection, and reverse-battery protection.

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