LP3881EMR-1.8/NOPB

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Introduction

LP3881EMR-1.8/NOPB is the voltage regulator IC developed by Texas Instruments. It is a linear regulator series and intended for applications in personal computer systems. It operates with a nominal input voltage range of 3V to 18V and provides a steady output voltage from 1.2V to 14V. It is tailored for personalized systems that require low quiescent current and high efficiency. With fast transient speed and good transient response, it is designed to ensure a reliable output voltage during a wide range of operating conditions. The device features an adjustable output voltage, overvoltage protection, current and thermal limit protection circuits. Furthermore, it also offers protections for input undervoltage lockout, output over-voltage, short-circuit and overtemperature.

LP3881EMR-1.8/NOPB Application Field and Working Principle

Application Field

LP3881EMR-1.8/NOPB is used in various applications that require low quiescent current and high efficiency. It is used in Windows PCs, home personal computers, server power management and battery-powered applications. It is also used in portable personal multimedia players, wireless handsets and medical instruments. The device is well-suited to controlling complex DC/DC converters, as well as providing direct regulation of low-power supplies in optical storage drives, mobile computing, flat panel display equipment and portable devices.

Working Principle

LP3881EMR-1.8/NOPB is based on the proven Linear Regulator architecture, combining a low-dropout regulator and a linear current buffer. The operating principle of the device is simple and straightforward. First, it compares the external setpoint voltage to the regulated output voltage. Then it actively alters the voltage drop across the external pass transistor to maintain the output voltage at the configured level. This maintains a stable output voltage over a wide range of input voltage. The device utilizes both an external N-channel MOSFET and on chip linear current buffer to reduce the pass transistor gate voltage and minimize power dissipation. The external MOSFET supplies current when there is no output load and the on-chip linear buffer is activated when the output load increases. This helps to reduce the power consumption of the device.

Features and Benefits

LP3881EMR-1.8/NOPB provides many features that make it very suitable for its application field. The device offers a wide input voltage range from 3V to 18V and a wide output voltage range from 1.2V to 14V. It is designed to operate with very low quiescent current and high efficiency. The device also supports adjustable output voltage and overvoltage protection, current and thermal limit protection, input undervoltage lockout, output over-voltage, short-circuit and over temperature. It also provides fast transient speed and good transient response, ensuring reliable output voltage during a wide range of operating conditions.

Package Options

LP3881EMR-1.8/NOPB is available in the 8-pin vSON package. It is a Pb-Free and Halide Free package, making it suitable for applications that require RoHS compliance. The device is also available in other forms like the compact TO‑263 and the space-saving 6-pin surface mount SOT‑23 packages.

Conclusion

LP3881EMR-1.8/NOPB is a voltage regulator IC developed by Texas Instruments for applications in personal computer systems. It operates with a nominal input voltage range of 3V to 18V and is designed to ensure a reliable output voltage over a wide range of operating conditions. The device features an adjustable output voltage, overvoltage protection, current and thermal limit protection circuits, as well as protections for input undervoltage lockout, output over-voltage, short-circuit and overtemperature. Furthermore, LP3881EMR-1.8/NOPB is available in several package options, including the 8-pin vSON, TO-263 and 6-pin SOT-23 packages.

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