LP38502ASD-EV

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Linear voltage regulators have been an integral part of most electronic systems for decades, and the LP38502ASD-EV is an excellent example of the many advances these regulators have come to offer. The LP38502ASD-EV is a three-terminal, adjustable, negative voltage regulator family that is able to drop an output voltage down to as low as -3V at a maximum current output of 500mA. It is also able to offer good AC and DC line/load regulation; as well as, low quiescent current operation. The LP38502ASD-EV is ideal for use in applications such as battery-operated equipment, as well as distributed low voltage power supplies powered from multiple DC/DC converters.

The work principle of the LP38502ASD-EV is based on a linear pass transistor and an error amplifier. This regulator provides a regulated voltage of -3V by taking the positive voltage in, passing it through a linear voltage regulator, and then using the error amplifier to reduce or increase the current to the desired regulated output voltage and current. The linear regulator uses an internal reference voltage as part of the error amplifier feedback loop. In addition, the LP38502ASD-EV features foldback protection to provide reliable regulation of the output voltage during output loading transients.

The LP38502ASD-EV offers an extra-low dropout voltage of only 0.4V and features an external shutdown pin for reducing power consumption if the input is lower than the output. The output voltage can be adjusted with the external resistor divider network to any voltage between -3V to -4.2V. It is pin-compatible with other negative linear voltage regulators and can replace negative voltage regulators on existing circuit boards.

When selecting the LP38502ASD-EV for use, the ambient temperature must be taken into account. This device is designed to function reliably in temperatures ranging from -40°C to +125°C, though it is recommended for use up to 85°C. In addition, input/output capacitors should be used for noise bypassing and stability; the suggested combinations are 4.7uF/10uF for ceramic capacitors and 10uF/22uF for tantalum capacitors.

The LP38502ASD-EV is a versatile and efficient tool for creating variable, adjustable, and personalized negative voltage supplies. This product is widely used in applications such as power amplifiers, audio devices, digital video appliances, and consumer gadgets. In summary, the LP38502ASD-EV is an economical and easy to use negative regulator, making it a great choice for a variety of applications.

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