LP2981IBPX-3.3

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LP2981IBPX-3.3 is a low-dropout, low power linear voltage regulator offering a wide range of features, including a low quiescent current, low dropout voltage, and a high output current. The regulator is a fixed 3.3V output device, and can provide up to 500mA of output current. It has a quiescent current of only 4µA, and a maximum dropout voltage of only 29mV at full load. It is a three-terminal device and it is available in both surface mount and through-hole package.

The LP2981IBPX-3.3 is a 3-terminal, P-channel LDO (low-dropout linear voltage regulator) and can be used in applications requiring very high output current and very low-noise operation, such as microprocessors, digital signal processors, DSPs, and FPGAs.

The LP2981IBPX-3.3 has a very low noise level, with a noise figure of 0.2µVRMS, as well as a fast transient response that helps to maintain a stable output voltage in rapidly changing loads. The device is protected against over-current, over-voltage, and reversed output voltage. The LP2981IBPX-3.3 also features soft-start and thermal protection.

The input voltage (VIN) of the LP2981IBPX-3.3 should be at least 0.8V greater than the output voltage (VOUT), and the maximum input voltage is 32V. The maximum output current is 500 mA and the output voltage can range from 1.1V to 28V. The quiescent current of the device is 4 µA, and the drop-out voltage is 19 mV at full load.

The working principle of the LP2981IBPX-3.3 is based on a P-channel MOSFET (PMOS) pass transistor. The output voltage of the regulator is determined by the voltage present at the feedback pin, which is the sum of the potential from the external resistor divider and a nominal internal 1V reference voltage. When the input voltage is higher than the output voltage, the PMOS pass transistor is driven in the linear region, thus regulating the output voltage to the preset value. The output voltage is regulated until the check voltage is smaller than the drop-out voltage, after which the pass transistor is driven into the limit region, making the output voltage follow the input voltage. This creates the low dropout voltage feature of the device.

The LP2981IBPX-3.3 is a popular choice in many applications, such as remote controls, consumer electronics, automotive accessories, and sensors, where its low power, high efficiency, and low-noise features make it ideal. The LP2981IBPX-3.3 is reliable and cost-effective and provides a wide output voltage range, making it a good choice for many applications.

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