LDS3985M18R

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"LDS3985M18R" is a linear low-dropout (LDO) regulator from Linear Technology, which is specially designed for applications that require small size and low quiescent current. This device offers excellent performance and high power density, making it capable of regulating power with precision and efficiency. This paper will discuss the application field, working principle, and features of the LDS3985M18R.

Application Field

The LDS3985M18R is an ideal choice for low-current power supply applications, such as portable electronic devices. It can provide up to 3 A of output current in a tiny 1 mm × 1.2 mm SO-8 package, while delivering excellent line and load regulation. This high power density makes the LDS3985M18R highly suitable for battery-powered and space-limited applications. It is also an excellent choice for battery operated consumer products, automotive electronics, and medical applications. Furthermore, the device has a low quiescent current of 17.5 μA, which extends battery life and reduces system power consumption.

Working Principle

The LDS3985M18R is a low drop out (LDO) voltage regulator. It is made up of an integrated circuit that includes two power transistors and two feedback transistors. The two power transistors are used to amplify the output current, while the two feedback transistors provide the LDO with feedback and setting of the output voltage. This feedback enables the LDS3985M18R to maintain a stable output voltage even as the input voltage changes. The LDS3985M18R uses an internal temperature compensation and pulse-skipping method to reduce ripple and noise, and it utilizes low ESR ceramic output capacitors to minimize the size and cost of the regulator.

Features

The LDS3985M18R has several features that make it an excellent choice for low-current power supplies. It offers excellent line and load regulation with a fast transient response of 1 μs. It provides up to 3 A of output current in a tiny 1 mm × 1.2 mm package. It also offers protection against over-current and over-temperature conditions. Additionally, the device has a high power density of up to 4 W/mm3, and it supports a wide operating temperature range of -40°C to +125°C. Furthermore, the LDS3985M18R has two voltage margins of 10 mV and 1 mV for normal and precision operation, respectively.

In conclusion, the LDS3985M18R is an excellent choice for low-current power supply applications. Its small size and low quiescent current make it ideal for battery-powered and space-limited applications. Additionally, it provides excellent line and load regulation with a fast transient response, and it supports a wide operating temperature range. Moreover, it offers reliable protection against over-current and over-temperature conditions, and it has a high power density of up to 4 W/mm3. For these reasons, it is an ideal choice for battery operated consumer products, automotive electronics, and medical applications.

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