LP3855EMPX-5.0

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Linear voltage regulators – such as the LP3855EMPX-5.0 – are used in a variety of applications to ensure stable, long-term power delivery from a power source. They employ a popular and time-tested method of regulating the output voltage by comparing the desired output voltage with the voltage present at the regulator’s output terminal. Voltage regulators are considered ‘linear’ when the amount of current delivered to the load is adjusted to maintain the output voltage at its desired value.

The LP3855EMPX-5.0 is a low-power, high-efficiency, microprocessor-graded linear regulator designed specifically for CPUs in personal computers and other computing devices. It offers excellent load and line regulation and can deliver current up to 500mA with a total supply current of only 1 μA. It features an adjustable output voltage range of 3.0V to 4.5V, an input voltage range of 8.0V to 20V, and a low drop-out voltage of 350mV at 100mA.

The LP3855EMPX-5.0 provides reliable power regulation for a wide range of microprocessors with a wide operating temperature range of -40C to +125C. It is specifically designed to deliver clean, noiseless power for microprocessor core voltages. It can be used with both ceramic and tantalum capacitors to ensure superior transient response characteristics.

The LP3855EMPX-5.0 operates on a basic principle of linear voltage regulation. It senses the output voltage on an internal comparator circuit, which is then compared to a reference voltage. The difference between the two voltages is amplified, and the amplified signal is used to control the amount of current delivered to the load. This allows the voltage regulator to maintain its output voltage at its desired value regardless of load variations and changes in input voltage.

The LP3855EMPX-5.0 also incorporates several important features that contribute to its versatile and reliable performance. Its built-in overvoltage and undervoltage protection shut down the device if the output voltage exceeds its preset limit. Its soft-start circuit reduces output surge current and inrush current to protect sensitive circuits against damage from input transients. Its available shutdown mode further enhances power savings.

The LP3855EMPX-5.0 is well suited for a wide range of applications, including computers, laptops, tablets, digital audio players, and cameras. Its built-in features, wide input voltage range, and tight load regulation make it ideal for use in low-power, high-efficiency applications. Its versatile design and wide operating temperature range also make it suitable for a range of industrial and automotive applications.

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