LT3970EDDB-3.3#TRPBF

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The LT3970EDDB-3.3#TRPBF is a monolithic synchronous step-down DC-DC buck converter, designed to operate from a wide range of input voltages from 3 V to 45 V and produces a regulated output voltage from 0.775 V to almost the input voltage. It has integrated power MOSFETs and is optimized for low noise and high efficiency applications. The LT3970EDDB-3.3#TRPBF is available in a low profile SOT-23 package with an exposed pad for improved thermal performance. It features excellent line and load regulation, programmable switching frequency up to 800 kHz, integrated soft-start, current limit and thermal shutdown.

Application Field

The LT3970EDDB-3.3#TRPBF is widely used in various applications, especially in mobile devices and industrial applications. It can be used in various low input voltage applications such as powering core voltage for ARM Cortex-M cores. It is also used in high grade 3.3 V battery-powered applications such as computers and consumer electronics, as well as in automotive applications. The smooth and tight output voltage regulation also make it an ideal choice for embedded system applications where low noise and tight regulation is required.

Working Principle

The LT3970EDDB-3.3#TRPBF operates on a switching conversion principle. In this principle, the input voltage is switched on and off in a controlled manner using two power MOSFETs. The LT3970EDDB-3.3#TRPBF has an adjustable internal voltage reference and a feedback control loop that ensures a stable output voltage. The integrated soft-start ensures smooth start-up without any undesirable output voltage transient or overshoot while the current limit prevents over-current conditions. The LT3970EDDB-3.3#TRPBF also has a temperature protection feature that shuts down the device if the temperature exceeds the safe operation limit.

The output of the switching conversion process is then connected to a low-dropout linear regulator to obtain a precise and regulated output voltage. An integrated edge-rate control circuit helps to reduce the switching noise, thereby improving the efficiency and overall system noise. In addition, the switching frequency can be adjusted from 200 kHz to 800 kHz to further reduce the output noise.

Conclusion

In conclusion, the LT3970EDDB-3.3#TRPBF is a monolithic synchronous step-down DC-DC buck converter and is available in a low profile SOT-23 package. It is an ideal choice for embedded system applications, mobile devices and other industrial applications requiring low noise and tight regulation. It has an adjustable internal voltage reference, a feedback control loop, soft-start, and current limit features, along with an integrated edge-rate control circuit to reduce noise in the output.

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