LT1949-1EMS8#PBF

Overview

The LT1949-1EMS8#PBF is a low-noise, high-efficiency buck switching regulator that has been designed for efficient DC-DC power conversion applications. It features a low quiescent current of less than one microamp and excellent line and load regulation characteristics. The LT1949-1EMS8#PBF is part of a line of DC-DC switching regulators manufactured by Linear Technology. It is ideal for applications such as notebook computers, personal digital assistants (PDAs), and battery-powered systems that require very low power dissipation, especially when compared to linear regulators.

General Description

The LT1949-1EMS8#PBF is an efficient 2-phase synchronous buck converter for DC-DC power conversion applications. It features a wide input voltage range of 4.5 V to 18 V, and its low dropout voltage enables efficient operation even at light loads. It provides a 1.2V fixed output voltage or adjustable output voltage by connecting a single resistor. The LT1949-1EMS8#PBF has fast transient response and is capable of delivering a 1A output current. It also has an enable output that allows the device to be turned off and on remotely. Other features include under-voltage lockout, thermal protection, and short-circuit protection.

Applications and Working Principle

The LT1949-1EMS8#PBF is primarily designed for applications that require a small footprint and low power dissipation in a very low-noise operation. This includes applications such as mobile phones, digital still cameras, MP3 players and many other consumer-electronics products. The device is well-suited for battery-powered applications, because of its low quiescent current and high efficiency when compared to linear regulators. The device features fast transient response and low output noise, which are important in switching regulator applications.

The LT1949-1EMS8#PBF uses the principle of synchronous rectification for maximum efficiency, and it uses a two-stage operation for noise reduction. The device features a soft-start feature that reduces inrush current and start-up time. It also features protection features such as thermal protection and short circuit protection. The device has excellent line and load regulation characteristics and offers a very low dropout voltage.

Conclusion

The LT1949-1EMS8#PBF is an efficient, low-noise, high-efficiency synchronous buck switching regulator designed for efficient DC-DC conversion applications. It offers excellent line and load regulation characteristics, and its low quiescent current makes it ideal for battery-powered systems. The device offers fast transient response and low output noise, and its protection features ensure reliable operation.