LP3966ESX-2.5

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The LP3966ESX-2.5 belongs to the family of PMIC (Power Management ICs) voltage regulators that is specifically designed for linear bus voltage applications. Moreover, this device offers a low-power, low-current, high-efficiency integrated power management solution. It consists of a power train controller, low noise chopper, current limit, linear regulator, and a voltage supervisor. The device features a wide input voltage range of 6 V to 24 V, two output choices of 2.5 V or 3.3 V, and its output voltage accuracy is better than 0.5 %. For the output voltage, the user can set the Vout as 2.6 V with pre-trimmed resistors. The device has low KVA current limit with integrated input over-voltage protection, output short-circuit protection and thermal shut-down. Moreover, it features low output noise at 75mV and high efficiency at 94% (typical).

The device is designed to power integrated circuits (ICs), general-purpose systems, and voltage level shifting. It is usually used to provide a fixed-level power solution for microcontrollers, memory modules, and FPGA. The device\'s output current ranges between 0.40 A and 1.20 A, depending upon ambient temperature and input/output voltage conditions. It offers low dropout voltage and low quiescent current, making it suitable for automotive, industrial and consumer applications.

LP3966ESX-2.5 offers excellent transient response, over-temperature protection, fast load-transient performance, and low-noise operation. The device features an internal soft-start circuit that allows the system to start safely and securely, thus avoiding any current surge. Furthermore, the device can operate in both forced and automatic mode. In the forced mode, the user has full control over the output voltage. While in the automatic mode, the device adjusts the output voltage itself, depending upon various factors, such as input voltage and load conditions. This helps reduce power consumption and makes the device more power efficient.

The LP3966ESX-2.5 works on the principle of linear regulation. The linear regulation technique uses an amplifier and an appropriate feedback circuit to maintain the output voltage at a predetermined level. Its transfer function is straight line between input and output voltage, an example of which is the voltage divider circuit. This technique relies on the basic voltage law of Ohm\'s law and the concept of differential gain of an amplifier.

The linear regulation technique utilizes an error amplifier, which monitors the differential voltage across the output terminals and compares it with the reference voltage. This differential voltage, also known as the error signal, is provided to the amplifier to drive the system’s output voltage. Based on the error signal, the controller increases or decreases the output voltage. The error signal is amplified and compared with the reference voltage, controlling the output voltage in such a way that it matches the reference voltage and forms the closed loop response.

The LP3966ESX-2.5 is a versatile, fast, and accurately trimmed solution for linear bus voltage applications. The device’s wide input voltage range, low power consumption, low output noise and the ability to work in both forced and automatic modes, makes it an ideal solution for various applications, including microcontrollers and memory modules.

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