LP3964ES-3.3

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LP3964ES-3.3 Application Field and Working Principle

LP3964ES-3.3 is a linear voltage regulator designed specifically for use in power management integrated circuits (PMICs). It is a three-terminal, low dropout regulator providing up to 3.3 V of output voltage. As part of a PMIC, it provides the precise voltage reference and precise current limit control necessary for modern power management systems.

Application Fields

LP3964ES-3.3 voltage regulators are used in a wide variety of applications, including consumer electronics, automatic test equipment, and industrial automation. From consumer communication and mobile computing applications, which require precise power management and efficient thermal control, to embedded power management designs, which are subject to stringent space and efficiency requirements, the LP3964ES-3.3 is a highly configurable, reliable and cost-effective choice for many power management systems.

This voltage regulator has the capability to provide precision voltage regulation for 12V to 3.3V, with a load current ranging from 10 mA to 1A, and output current ripple less than 5mV, provides an ideal power solution for many low-voltage and low-power applications. It also provides short-circuit and over-voltage protections and external enable and reset control capabilities, making it suitable for use in demanding applications such as automotive, consumer, computer and networking applications.

Working Principle

LP3964ES-3.3 operates based on the principle of feedback control, meaning the output voltage is regulated by comparing an internal reference voltage to an external feedback voltage derived from the output voltage. The internal reference voltage is compared to the external feedback voltage in order to regulate the output voltage. The internal error amplifier within the LP3964ES-3.3 compares the feedback voltage to the internal reference voltage and generates an error voltage. This error voltage is then used to drive the error amplifier output stage, which adjusts the control signal to the external P-channel power MOSFET to achieve the desired output voltage.

The LP3964ES-3.3 also includes an adjustable current limit, which prevents the load current from exceeding a predetermined safe maximum level. To prevent the over-voltage protection from activating due to a large load current, the current limit can be set via an external resistor. The LP3964ES-3.3 also includes an adjustable soft-start feature that prevents the output voltage from overshooting during power-on or power-off, and a shut-down latch that can be activated when the output voltage is outside acceptable voltage limits.

Conclusion

LP3964ES-3.3 is a high-precision voltage regulator designed specifically for use in PMICs. It provides precise voltage reference and precise current limit control required for modern power management systems. It is best suitable for low-voltage and low-power applications, providing short-circuit and over-voltage protection as well as external enable and reset control capabilities.

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