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Introduction

The LT3680 IDD#PBF is a wide input range, adjustable frequency, current mode DC-DC converter with integrated low RDS(ON) power MOSFETs. This device is ideal for low voltage systems and portable applications. It features excellent light load efficiency and current monitor output with cycle-by-cycle current limit. The switching frequency can be adjusted over a wide range with an external resistor, while both the high and low voltage sides are adjustable using external resistors. The LT3680 IDD#PBF also features dip-free start-up and frequency synchronization capabilities, making it one of the finest DC-DC switch regulators available on the market today. In this article, we will discuss the applications and working principles of the LT3680 IDD#PBF.

Applications

The LT3680 IDD#PBF has a variety of applications, including automotive, industrial and telecom systems. It is popular in applications where space is a premium, such as laptop computers or portable audio equipment. It is particularly suitable for automotive applications where the input voltage varies from 4.5V to 40V with tight line and load regulation requirements.

This device can be used for DC to DC conversion of either battery or bulk input voltage. Its wide input voltage range and high power output makes it suitable for powering a variety of components, such as processors, FPGAs, digital signal processors, high-end amplifiers, and digital hearing aids. For example, the LT3680 IDD#PBF can be used as a step-down converter to generate 3.3V from a 5V input, or as a synchronous buck regulator to generate 12V from an 18V supply.

Working Principle

The LT3680 IDD#PBF is a current mode DC-DC converter. It consists of an oscillator, comparator, power MOSFETs, current sense resistors and associated control circuitry. The oscillator generates a pulse-width modulated (PWM) signal. The comparator generates an enable signal that is used to control the MOSFETs. The current sense resistors are used to detect the load current, which is then fed back to the control circuitry. The control circuitry regulates the duty cycle of the PWM signal and adjusts the frequency of the oscillator to maintain an output voltage that is proportional to the input voltage.

The frequency of the LT3680 IDD#PBF can be adjusted using an external resistor. As the resistance value increases, the frequency will decrease, while as the resistance value decreases, the frequency will increase. This allows the user to optimize the frequency for a specific application, such as reducing the switching frequency to limit EMI in high noise applications, or increasing the switching frequency in applications where the power is highly loaded.

The LT3680 IDD#PBF also features a dip-free start-up and a frequency synchronization capability. The dip-free start-up ensures that the output voltage remains stable even in the event of a sudden short- or long-term load change. The frequency synchronization feature allows the user to synchronize the oscillator to an external clock or another switching source, ensuring that multiple regulators operating in close proximity do not interfere with each other.

Conclusion

The LT3680 IDD#PBF is a modern, high-efficiency DC-DC regulator ideal for low voltage systems and portable applications. This device features a wide input voltage range, adjustable switching frequency, integrated low RDS(ON) MOSFETs, dip-free start-up and frequency synchronization, making it one of the best DC-DC switch regulators available on the market today.

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