LP3874ES-2.5

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PMIC, or Power Management Integrated Circuit, is a semiconductor device that helps regulate voltage and current in a system. Linear voltage regulators are one type of PMIC and are commonly used for providing a stable voltage output from a variable voltage input. The LP3874ES-2.5 is a low-dropout, 3A linear voltage regulator from Texas Instruments that is designed for use in portable and sophisticated applications. This article will discuss the applications, as well as the operating principle, of the LP3874ES-2.5.

Applications

The LP3874ES-2.5 is designed for use in a variety of portable and sophisticated devices. It can be used as a general purpose regulator in digital cameras, PDA’s, and portable audio systems, and it can also be used for charging applications, such as for USB and vibrator charging in cell phones. Its low quiescent current of 75uA and its low 100mV dropout voltage make it ideal for battery powered applications.

Operating Principle

The LP3874ES-2.5 is a linear voltage regulator that operates by using an adjustable voltage reference and a N-channel MOSFET. The voltage reference determines the output voltage, and this reference is controlled by the Enable control logic input (EN). When the EN input is HIGH, the regulator is enabled and the output voltage is set by this voltage reference. When the EN input is LOW, the output is clamped to a low voltage, effectively disabling the regulator.

The N-channel MOSFET is used as a pass device. When the EN input is HIGH and the input voltage is greater than the output voltage, the MOSFET will be ON and will allow current to pass through it, thus providing the output voltage. If the input voltage is lower than the output voltage, the MOSFET will be OFF and no current will flow through it – the output voltage will be the same as the input voltage.

The LP3874ES-2.5 also has an internal over-current protection (OCP) circuit. This circuit monitors the voltage drop across the MOSFET and when it becomes too high, the OCP circuit will shut-down the regulator to protect it from further damage.

Conclusion

The LP3874ES-2.5 is a low-dropout, 3A linear voltage regulator from Texas Instruments that is designed for use in portable and sophisticated applications. It can be used in digital cameras, PDA’s, portable audio systems, and for charging applications, such as USB and vibrator charging in cell phones. It has a low quiescent current of 75uA and a low 100mV dropout voltage, making it ideal for battery powered applications. It operates by using an adjustable voltage reference and a N-channel MOSFET, and it has an internal over-current protection (OCP) circuit.

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