LT3976IUDD#TRPBF

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Part 1 Introduction

LT3976IUDD#TRPBF is a low current, high efficiency wide Vin synchronous buck DC/DC converter from Linear Technology. The device includes a voltage regulator, dual current mode synchronous PWM converters, internal power MOSFETs and requires few external components. It is designed to provide a wide output voltage range of 0.8V to 5.5V. The device has active pre-bias start capability and can operate at high switching frequency of up to 5MHz, making it suitable for portable and compact system applications such as cell phones, personal digital assistants, web tablets and digital still cameras.

Part 2 Application field and Working Principle

LT3976IUDD#TRPBF DC/DC converters are suitable for a wide range of applications, including battery-powered systems, distributed power systems, high efficiency portable systems and point-of-load regulation. It is versatile, offering the user a wide input voltage range and extensive protection features. The device is capable of operating over a very wide input voltage range from 2.5V to 40V. The wide input range makes the device suitable for applications such as automotive buck regulators, as well as industrial and telecom power solutions.

The LT3976IUDD#TRPBF is a synchronous buck converter with internal power switches. The power stage utilizes dual current mode synchronous PWM buck controllers that are connected in parallel. The converter employs a constant-input current, phase-shift control technique. This leads to high efficiency over a wide load range with minimal heating. The operating frequency is adjustable up to 5MHz with two external resistors, allowing faster transient response, while keeping ripple frequency outside the audio band. The wide operating frequency allows the use of small inductors and ceramic capacitors, keeping the solution small and cost effective while providing excellent reliability. The device also features an adjustable soft start, enabling seamless start up with reduced inrush currents. The device also features overvoltage, undervoltage and short circuit protection for both output and input.

Part 3 Conclusion

The LT3976IUDD#TRPBF is a high efficiency, low noise, low current DC/DC synchronous buck converter from Linear Technology. With active pre-bias start capability, wide input voltage range and adjustable frequency up to 5MHz, the device is suitable for a wide range of applications. With extensive protection features and small size, the device is an ideal solution for portable and distributed power systems, battery-powered systems, high efficiency portable systems and point-of-load regulation.

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