LP3922RLX-B/NOPB

Series:	*
Packaging:	Tape & Reel (TR)
Part Status:	Active
Package / Case:	--
Supplier Device Package:	--
Base Part Number:	LP3922

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Introduction to LP3922RLX-B/NOPB

LP3922RLX-B/NOPB is an integrated step-down DC-DC converter designed to provide a regulated power supply with low power dissipation and high efficiency. It integrates a synchronous rectifier and a low-side current sensing network. This provides an easy-to-use solution for a wide range of battery charger applications. It is designed to operate in the voltage range of 4V-28V, making it ideal for wide input range applications like USB power adapters, portable electronics, and automotive main charger designs. It is also suited for low input voltage applications such as USB-powered devices, including smartphones, tablets, and other low-power portable electronics.

Application Field and Working Principle

The LP3922RLX-B/NOPB is categorized as a PMIC (Power Management Integrated Circuit) under the Battery Chargers category. It is used for DC-DC step-down conversion and low-side current sensing in battery applications. The device can be used to regulate the battery voltage output under various input conditions and charging profiles. The device consists of a buck converter, an integrated low-side current sense network, and an adjustable clock circuit. The buck converter accepts a range of input voltages and outputs a regulated voltage to a battery. It utilizes synchronous rectification for improved efficiency. The low-side current sensing network integrates two resistors and an operational amplifier to provide accurate current sensing and regulation. The clock circuit consists of an adjustable RC network with an internal oscillator to generate the switching frequencies required. The LP3922RLX-B/NOPB has several protection features such as under-voltage lockout, over-current protection, thermal shutdown, and adjustable peak current limiting, making it suitable for a wide range of battery applications.

Conclusion

The LP3922RLX-B/NOPB provides a compact and cost-effective solution for step-down DC-DC conversion in battery charging applications. It has a wide operating voltage range and multiple protection features, making it suitable for a variety of applications. It provides an easy-to-use solution for low-power portable electronic devices as well as automotive main charger designs.

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