LTC3870EUFD#TRPBF

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The LTC3870EUFD#TRPBF is a synchronous current mode step-up DC/DC controller with high-speed pulse-width modulation (PWM), featured with a unique spread spectrum modulation technique to minimize EMI radiation. This IC can be used for voltage boosting and battery charging applications. It works well with external MOSFETs to generate high-frequency DC/DC Converters.

Application Field:

The LTC3870EUFD#TRPBF is designed for high efficiency and high power transfer DC/DC converter applications, such as powering cell phones, high-end GPS systems, portable projectors and other consumer electronic products. It\'s also suitable for industrial scenario where high efficiency or power transfer is required.

Working Principle

The LTC3870EUFD#TRPBF is a synchronous buck controller operating in current mode. It uses an external MOSFET and an external inductor to regulate the output voltage. Initially, the PWM controller sets up a voltage in the MOSFET\'s gate to turn it on.

When the MOSFET is on, the input current flows through the inductor and charges the output capacitor, resulting in a voltage increase across the output capacitor. The PWM controller then senses the voltage across the output capacitor. It calculates the inductor current by measuring the voltage change across the inductor during one switching cycle.

The controller compares the inductor current with the programmed maximum inductor current. When the inductor current decreases to the programmed maximum inductor current, the controller will turn off the MOSFET. After a certain off time, the controller will switch on the MOSFET and the switching cycle will be repeated. By repeating this cycle, the output voltage is kept under control.

The LTC3870EUFD#TRPBF uses a spread spectrum modulation technique to minimize EMI radiation. This technique works by slightly reducing the switching frequency of the DC/DC converter in order to reduce the peak of high-frequency noise. This results in noise peaks of lower amplitude and spread over a wider frequency range.

The LTC3870EUFD#TRPBF also features current and over-temperature protection, and adjustable soft-start, output over-voltage and under-voltage protection to ensure that the DC/DC converter operates safely and reliably. The integrated power good indicator can be used to detect whether the output voltage is in regulation.

Conclusion

Overall, the LTC3870EUFD#TRPBF is a highly-integrated and cost-effective solution for DC/DC converter applications. It is a synchronous current-mode DC/DC controller which features high-speed PWM switching, spread spectrum modulation, and multiple protection functions. It is suitable for applications where high efficiency and high power transfer are required, such as powering cell phones, high-end GPS systems, portable projectors and other consumer electronic products.

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