LT3991EMSE-5#PBF

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DC-DC switching regulators are very common, and for good reason. They are reliable, relatively simple and can provide highly efficient conversion from one voltage to another. The LT3991EMSE-5#PBF is a monolithic synchronous switching regulator from Linear Technology that provides constant frequency contraction mode operation with selectable output current limits in a compact package, and is suitable for many different applications.

Basic Principals

Switching regulators work on the concept of an input voltage being converted, via various actions, into an output voltage. This process is known as a converging action and is commonly referred to as switching. The quality and efficiency of the conversion is dependent upon various factors, and the quality and reliability of the components employed in the regulator play an integral part.

At the construct elements level, the LT3991EMSE-5#PBF switching regulator combines the functions of a voltage reference, current- limit circuitry, an oscillator, a driver and a low on-resistance output switch in a single monolithic integrated circuit. This single monolithic packaged integrated circuit outputs a constant frequency (150kHz typical) using an external resistor, allowing the use of small, low cost components. A linear architecture is adopted to enable an operating voltage ranging from 2.7V to 24V, enable the desired current limits and provide reliable pulse-by-pulse current limiting.

Features

This specific switching regulator houses a wide range of features. A few stand-outs are:

• High efficiency (>95% efficiency)
• Integrated switching MOSFET for superior DC-DC conversion efficiency and high current handling capability
• Programmable output voltage up to 24V
• Programmable Peak Current Limit
• Small, low profile 5mm x 5mm x 1.0mm QFN package
• Low no-load operating current (<3µA)
• Fast (<1.5μs) over-temperature protection
• Externally adjustable switching frequency between 150kHz and 1.25MHz

Applications

Due to the feature list mentioned above, the LT3991EMSE-5#PBF switching regulator makes an ideal choice for a range of applications. Many products requiring DC-DC conversion such as smartphones, tablets and other computing devices can benefit. This switching regulator is particularly useful in battery powered applications within these devices due to its low quiescent current, fast over-temperature protection and high efficiency.

For applications with power handling requirements, the package allows for a larger current throughput by adding further external components. The integration of the current limit circuitry allows for variable peak current limit settings to suit load requirements, and thanks to its high speed switching, it can be used in applications requiring pulse-by-pulse regulation.

In short, the versatility of the LT3991EMSE-5#PBF switching regulator makes it suitable for a number of applications, particularly in portable or handheld products. The combination of its features and its compact package make it a useful choice for battery powered products requiring DC-DC conversion.

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