L4949DR2

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Power management integrated circuits (PMICs) are essential components for the efficient operation of many electronic products, from the smallest portable device to the most advanced medical equipment. One particular type of PMIC, the linear voltage regulator, is used to regulate the direct current (DC) power output of a power supply. A typical example of such a linear voltage regulator is the L4949DR2, which is primarily used in portable telecommunications equipment. This article will provide an overview of the L4949DR2, including its application field and working principle.

The L4949DR2 is a two-terminal adjustable positive voltage regulator with an output voltage range of 5V to 45V. It was designed to provide a stable voltage source to cell phones, personal digital assistants (PDAs), and other portable devices that are powered by a single battery or other sources of DC power. Its small size and low power consumption allow it to be incorporated into products with very limited space and energy budget. The device is pin-compatible with other L49xx series regulators, making it easy to upgrade existing designs.

Design Specifications

The L4949DR2 features an on-chip sense resistor and error amplifier that allows for precise voltage regulation. It also has an adjustable output voltage range of 5V to 45V, which can be set with external resistors. The device has a high output current of 200mA, an alternate current (AC) ripple rejection of 75dB, and a line regulation of 0.02%. It has an operating temperature range of -40°C to +85°C and a shutdown current of less than 0.1mA. In addition, the device has built-in protection circuits that include fault conditions such as current limit and thermal shutdown.

Working Principle

The L4949DR2 works by comparing the voltage at its output to the reference voltage. It then adjusts the output voltage accordingly to ensure that the output voltage is always equal to the reference voltage. This is done with the help of an on-chip error amplifier and sense resistor. When voltage drops, the error amplifier will detect the change and signal the control circuit to increase the output voltage. This process will continue until the power output of the regulator is equal to the reference voltage.

Application Field

The L4949DR2 is commonly used in portable telecommunications devices, such as cell phones and PDAs, because of its small size and low power consumption. It can also be used in mobile computing devices, such as laptop computers, as well as in automotive applications. Its high output current makes it suitable for use in high-power applications, such as powering LED lighting systems.

The L4949DR2 is an ideal choice for such applications due to its ability to provide highly accurate output voltage regulation over a wide range of conditions, as well as its built-in protection features. Its small size and wide range of features makes it an ideal choice for application in a variety of electronic products.

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