LP3961ESX-1.8

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The LP3961ESX-1.8 (hereafter referred to as LP3961) is an efficient and highly-integrated, easy-to-use linear voltage regulator designed for use in applications where low power consumption and high efficiency are important. It is a 3-terminal/direct current (DC/DC) regulator, with an adjustable output voltage from 1.210V to 1.8V and provides up to 1A output current. The device features an input voltage range from 4.5V to 16V and is designed for fast transient applications. It is available in a SOT-23-5L package and all external connections utilize the SOT-23-6L pinout.

Application Fields

The LP3961 is ideal for battery-powered portable and handheld devices, such as cell phones, digital cameras, PDAs, and personal media players. It can also be used in medical, industrial, or automotive applications where low-voltage, low-noise, and high efficiency are important. The device can be used to regulate the input voltage, ensuring an optimal level of voltage for battery-powered applications.

Working Principle

The LP3961 uses a transconductance voltage- mode (VM) control architecture and a resistive-feedback loop that tracks the output voltage and adjusts the current through the regulating transistor in order to maintain a precise output voltage. The LM3961 is a low-dropout (LDO) regulator, meaning that it can operate at input voltage levels close to (but still above) the regulated output voltage. When the input voltage is greater than the regulated output voltage, the LDO will draw more current to maintain the output voltage as close to the setpoint as possible. The LP3961 can also operate as a linear regulator, drawing a current of up to 1A and providing an output voltage that is proportional to the input voltage.

The LP3961 incorporates MOSFETs to regulate the output voltage and minimize noise and power consumption. The MOSFETs are connected in a closed loop to maintain a stable output voltage and reduce power consumption. The LM3961 also features a current-limit circuit for additional protection against high current applications. The LP3961 also features a built-in thermal shutdown circuit that prevents the regulator from overheating in extreme conditions.

The LP3961 includes a wide range of features such as Wake-up feature and Shutdown feature. The Wake-up feature allows the device to instantly switch on in response to a signal and the Shutdown feature allows the device to remain in shutdown mode until the signal is removed, helping conserve power when not in use. The LP3961 also includes short circuit protection, open-loop protection, power up/down sequence, an enable pin, and an output voltage selection pin.

In conclusion, the LP3961ESX-1.8 is an efficient and high-integrated linear voltage regulator designed with low power consumption, noise, and high efficiency in mind. It features an adjustable output voltage from 1.210V to 1.8V and provides up to 1A output current. The device is ideal for a variety of applications, including battery-powered portable and handheld devices, medical, industrial, automotive, and other applications where low-noise and high efficiency are important.

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