LTC3835IFE#TRPBF

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The LTC3835IFE#TRPBF is a DC-DC switching controller intended for high current, synchronous buck applications. It has excellent thermal performance and features suitable to the DC-DC converter. This article aims to provide an overview of the LTC3835IFE#TRPBF application fields and working principles.

Application Fields

The LTC3835IFE#TRPBF is a DC-DC switching controller suitable for a wide variety of applications. It is ideal for high power applications and can handle current of up to 500 A at high operating temperature. It provides accurate current limiting and over-voltage protection with a few external components, making it suitable for automotive, industrial, computing, communication, battery charging and other similar power applications. It is also configured with a precision reference, allowing for precise operation in a wide operating temperature range. Additionally, it is capable of driving both N-channel and P-channel MOSFETs in the synchronous buck circuit, making it suitable for high efficiency solution.

Working Principle

The LTC3835IFE#TRPBF operates on the pulse-width modulation (PWM) control principle. It implements an internally fixed frequency hysteresis-based current-mode PWM control architecture that can operate at frequencies up to 500kHz. It regulates output voltage by varying the duty cycle of the PWM signal. The duty cycle is controlled by an adaptive oscillator and compared with an internal reference voltage, allowing the significant reduction of external components and improving efficiency.

The LTC3835IFE#TRPBF also features the Burst Mode® operation, allowing it to reduce quiescent current and improve light load efficiency. In Burst Mode®, the device operates in an intermittent PWM switching mode, enabling a smaller switching frequency. When the programmed reference voltage is reached, the device will transition to a lower frequency and remain in that state until the output current increases beyond the set level. The Burst Mode® feature makes the device ideal for applications with light load characteristics, such as battery charging and data communications.

The LTC3835IFE#TRPBF incorporates several protection features that enhance reliability. It includes under-voltage lockout, over-voltage protection, cycle-by-cycle current limit and thermal shutdown protection. The under-voltage lockout controls the minimum voltage for power-up sequence to prevent malfunction at low voltage inputs. The over-voltage protection shuts down the device when the voltage output is greater than the predetermined maximum voltage level. The current limit protection prevents current runaway and restricts the current flowing through the power switch. Finally, the thermal shutdown protection will activate at extreme temperatures to protect both the device and the application.

Conclusion

The LTC3835IFE#TRPBF is an extremely versatile DC-DC switching controller capable of driving both N-channel and P-channel MOSFETs in the synchronous buck circuit. With high current handling capacity and protection features, it is suitable for a wide range of applications such as automotive, industrial, computing, communication, battery charging and other similar power applications. Additionally, it features Burst Mode® operation, allowing it to reduce quiescent current and improve light load efficiency. Its high efficiency and precise operations makes it an ideal choice for a variety of power systems.

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