LP2985-25DBVR

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LP2985-25DBVR Application Field and Working Principle

LP2985-25DBVR is a low-dropout linear regulator integrated circuit, specifically designed to meet the requirements for the distributed power systems and multiple rail voltage applications. It belongs to a family of linear voltage regulator ICs, categorized as PMIC, Voltage Regulators and Linear Regulators. This application note will discuss the features of the LP2985-25DBVR IC, its application field and its working principle.

Features and Specifications

The LP2985-25DBVR is designed to meet the needs of distributed power systems that require clean and accurate voltage levels. It is a 3-pin, low-dropout linear regulator with an adjustable output voltage range of 0.8V to 8.5V. It is capable of sourcing or sinking up to 380mA of load current with a maximum dropout voltage of 500mV. The device incorporates a PMOS transistor to ensure very low dropout voltage, even at high load currents. This regulator is available in two packages;EPSO-6 (2.05 x 2.08 x 0.8mm) and UDFN-6 (2 x 2.1 x 0.55mm).

One of the key features of the LP2985-25DBVR is its "Shutdown" mode. This mode allows the regulator to be connected to a logic system without any risk of false start-up due to any leakage currents on the system. In this mode, the regulator will not draw any current, ensuring low system power consumption.The LP2985-25DBVR also has an "Over-Voltage Protection" feature that prevents the output voltage from exceeding the maximum rated voltage. It also has short circuit and thermal protection.

Application Field

The LP2985-25DBVR is widely used in distributed power systems and multiple rail voltage applications where clean and accurate voltage supply is required. It is widely used in communications systems, industrial automation, home and automotive applications, embedded and IoT applications. It can also be used in computer systems and audio-video equipment.

Working Principle

The basic working principle of a linear regulator is to regulate the output voltage level of the power supply. The LP2985-25DBVR linear regulator accomplishes this by using a series of internal transistors to regulate the flow of current from the input voltage to the output voltage. The operating voltage of the regulator is determined by the difference between the input and output voltages divided by the current regulating transistor\'s gain. The regulator has two feedback elements, an internal voltage reference and a comparator, that monitor the output voltage level to maintain a regulated voltage. The regulator also has a current-limiting circuit that protects the load from damage due to over current conditions.

When the input voltage is applied to the device, the voltage is compared with the internal voltage reference. The difference between them is then amplified by the current regulating transistor, which then controls the current flow to maintain the desired output voltage level. When the output voltage is above the reference voltage, the current regulating transistor will decrease the current flow, and when the output voltage is below the reference voltage the current regulating transistor will increase the current flow. In this way, the output voltage stays within the desired range. The current limiting circuit is then used to protect the device in case of an overload.

The LP2985-25DBVR is an excellent choice for distributed power systems and multiple rail voltage applications where clean and accurate voltage supply is required. It is a reliable and cost-effective solution for such applications, as it integrates all the necessary features for power regulation and protection.

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