LP2985A-18DBVR

LP2985A-18DBVR Application Field and Working Principle

LP2985A-18DBVR is a low-dropout voltage regulator that belongs to the PMIC - Voltage Regulators - Linear category. It is designed to provide efficient power regulation for industrial, computer, telecom, and consumer applications. The LP2985A-18DBVR is offered in an SOT-223 4-Pin package and is suitable for input voltages of up to 11V. With its tight line regulation, the LP2985A-18DBVR offers a wide input voltage range of 1.2V to 5.5V and a maximum output current of 350 mA.

The LP2985A-18DBVR is a low quiescent current regulator that consumes only 250 μA typical current, while providing an output current of up to 350mA at a low output voltage ripple. It has integrated protection features such as under-voltage lockout (UVLO), reverse current protection, and thermal shutdown.

Working Principle

The LP2985A-18DBVR is a linear regulator, which is based on the principle of controlling the output voltage by adjusting the input voltage to the device. The LP2985A-18DBVR utilizes a two-layer structure consisting of an external transistor and an internal Reference Voltage Generator (RVG) circuit. The RVG circuit is used to generate a reference voltage. This reference voltage is compared to the input voltage and the difference is used to set the output voltage of the device.

The output voltage is determined by the following equation:

• V_OUT = V_REF + ? (V_IN - V_REF )

Where V_REF is the reference voltage generated by the RVG, and ? is the error factor of the RVG.

The LP2985A-18DBVR utilizes a low quiescent current architecture that allows for efficient power conversion. The dropout voltage of the regulator is just 0.2V at 350mA output. This ensures that the device can support a wide range of input voltages while providing reliable output voltage regulation.

Applications

The LP2985A-18DBVR is a general purpose low dropout regulator that can be used in a wide range of applications. It is ideal for portable devices like mobile phones, tablets, and notebooks, where a low quiescent current and wide input voltage range is required. It can also be used in motor control applications, industrial equipment, LED drivers and displays, and consumer electronics.

The LP2985A-18DBVR is also suitable for applications that require tight line regulation and low output voltage ripple for powering low-noise analog and digital circuits. It is designed to maintain a high level of stability when subjected to load, line, or temperature variations.

Conclusion

The LP2985A-18DBVR is a high-performance low dropout voltage regulator that is ideal for a wide range of applications, including consumer electronics, industrial equipment, motor control, and LED lighting. It has a tight line regulation, low quiescent current, and low output voltage ripple, making it an excellent choice for power management.