LT3573IMSE#TRPBF

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Applications

The LT3573IMSE#TRPBF is a low-profile, high-performance DC-DC converter with integrated high-side and low-side switches. It also includes a high-accuracy internal voltage reference, an integrated low-dropout (LDO) regulator, and an adjustable soft start. The LT3573IMSE#TRPBF is often used in a variety of automotive, industrial, and consumer applications such as those for charging of multiple chemistries, powering systems with high efficiency, and providing step-down conversion at frequencies up to 4MHz.

The LT3573IMSE#TRPBF features a 1mm- high profile and is designed with low resistance, low inductance switches. It also features Burst Mode operation and programmable soft-start for low power dissipation. Its high-efficiency power conversion is achieved through external compensation and programmable user selectable inductor volt-seconds on both the high-side and low-side switches.

The LT3573IMSE#TRPBF is typically used in systems that require a high efficiency, power-conversion solution, such as those used in smart phones, digital still cameras, and portable medical devices. Additionally, LED lighting applications that require multiple LED strings and a high efficiency power supply can also benefit from the use of this part.

Working Principle

The LT3573IMSE#TRPBF is a high efficiency switching regulator with integrated high-side and low-side switches. Its switching frequency can be programmed up to 4MHz, and it includes an adjustable soft start. The adjustable soft start helps reduce the inrush current when the part is first initialized, and it also helps reduce the number of total outputs.

The part operates in Burst Mode, allowing the device to remain in an ultra-low power state while still providing a constant output voltage and current over the load range. The LT3573IMSE#TRPBF supports an automatic power saving feature that will reduce switching frequency when the load current drops below a certain threshold, thus reducing power dissipation. The LT3573IMSE#TRPBF also includes a power good output that can be used as an indication of successful start-up or as a fault output.

The LT3573IMSE#TRPBF supports synchronous rectification to attain high efficiency, and it features integrated low-side and high-side switches to reduce power dissipation. The DC-DC switching frequency is adjustable up to 4MHz, and the device requires a minimum of input voltage for start-up and output voltage regulation.

The LT3573IMSE#TRPBF features an integrated low drop-out (LDO) regulator that supports up to 2A of output current, a voltage reference locked to 0.8V and a programmable soft-start. The device also includes integrated short-circuit, thermal overload, and under-voltage protection.

Conclusion

The LT3573IMSE#TRPBF is a high-performance DC-DC switching regulator that provides high efficiency, power conversion with integrated high-side and low-side switches. It is designed to reduce power dissipation and support systems that require a high efficiency power supply, which is useful in portable medical devices, digital still cameras, and other electronic appliances. The LT3573IMSE#TRPBF features an adjustable soft start, integrated low drop-out regulator, voltage reference, and other features that support its intended applications.

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