LP3964EMPX-1.8 Datasheet/PDFPMIC - Voltage Regulators - Linear
The LP3964EMPX-1.8 is a step-down DC-DC converter with a low dropout voltage regulator specifically designed to provide efficient power management in a wide range of low power applications. The LP3964EMPX-1.8 is a highly integrated device that includes an inductor, a switching element, an internal linear regulator, and a voltage reference. It is capable of delivering up to 1.8 A continuous output current.
The LP3964EMPX-1.8 is suitable for use in a variety of applications, including portable computers, cell phones, tablet PC and low power embedded systems. It offers many advantages over traditional discrete step-down regulators, such as reduced board space, energy efficiency, and improved thermal performance. The LP3964EMPX-1.8 is designed to operate in a wide input voltage range of 3 V to 36 V, and provides low power consumption, high power conversion efficiency and output accuracy. It is available in the SOIC-8 package.
Working Principle
The LP3964EMPX-1.8 step-down DC-DC converter consists of a buck converter and an ultra-low dropout linear regulator. The buck converter is used to convert a high input voltage to a lower output voltage, while the linear regulator maintains a constant output voltage with a very low output ripple. The buck converter uses pulse width modulation (PWM) to convert a variable voltage, while the linear regulator constantly monitors the output voltage.
The inductor in the LP3964EMPX-1.8 acts as an energy storage device. When the PWM signal is active, current from the input flows into the inductor, and when the signal is inactive, the current stored in the inductor is released to the output. The switching element is used to control the flow of current through the inductor. The internal linear regulator is used to regulate the output voltage by comparing the output voltage to an internally generated reference voltage. The internal linear regulator adjusts the output voltage by controlling the PWM signal.
The LP3964EMPX-1.8 also features a programmable soft-start function and an overtemperature protection circuit. The soft-start function is used to prevent large inrush currents when the output voltage is initialized. The overtemperature protection circuit monitors the die temperature and shuts down the regulator when the temperature exceeds a programmable threshold.
Conclusion
The LP3964EMPX-1.8 is an efficient, low power step-down DC-DC converter with an ultra-low dropout linear regulator. It is ideal for use in a wide variety of low power applications, from portable computers to cell phones and other embedded systems. The LP3964EMPX-1.8 is capable of supplying up to 1.8 A continuous output current, and offers improved thermal performance, low power consumption and excellent output accuracy. It is available in the SOIC-8 package.