LTC3769IUF#PBF

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LTC3769IUF#PBF Application Field and Working Principle

The LTC3769IUF#PBF is a family of synchronous, step-down, dc-to-dc switching controllers designed to operate with a wide range of highside and lowside power MOSFETs, allowing a system designer to utilize the capabilities and benefits of synchronous rectification. DC-to-DC switching controllers of this kind can provide efficiencies up to 95 percent and can also offer current-mode control for superior load transient response.

Overview of Features

The LTC3769IUF#PBF offers several features and functions to support its application field. Its features include an adjustable frequency of 200 kHz to 1 MHz, a wide input voltage range up to 60V, and a precision voltage reference of 0.4V for output voltage control. Additionally, the device has output voltage sequencing and tracking capability, adjustable dead time and soft start, as well as undervoltage lockout and current limit protection.

Operating Modes and Working Principle

The LTC3769IUF#PBF operates in either current mode or voltage mode control. In current mode control, the output current is monitored and switching is based on the sensed current, allowing fast transient response. In voltage mode control, the output voltage is monitored and compared to the internally generated reference voltage with an internal error amplifier. The duty cycle of the output switching is determined by the error amplifier. In either control scheme, the MOSFET duty cycle is limited at 100 percent duty cycle.

In the LTC3769IUF#PBF working principle, the output voltage is sensed by the voltage sensing node. It is then compared with the internal voltage reference voltage through the internal error amplifier, and the error amplifier’s output drives the PWM comparator. The PWM comparator output enables the high side MOSFET through the internal dead time generator’s signal. The internal error amplifier output is also connected to the current limit comparator to monitor the output current and limit it to a certain level.

Characteristics of LTC3769IUF#PBF

The LTC3769IUF#PBF has some advantageous characteristics, such as wide input voltage range from 4V to 60V, adjustable switching frequency up to 1MHz, controlled switcher dead time for higher output power and RDS(ON) reduction, current mode for high transient response, overvoltage and overload protection, OVP limit and soft start, and power good functionality.

Applications of LTC3769IUF#PBF

The LTC3769IUF#PBF provides synchronous, step-down, DC-to-DC switching controller functionalities, making it ideal for powering industrial-grade applications where system regulation accuracy and reliability are paramount. Specifically, it is suitable for applications such as distributed power systems, point-of-load regulators, DC-DC adapters, polarity inverters, telecom and broadcast equipment, consumer electronics, and battery management systems.

Conclusion

The LTC3769IUF#PBF is a family of synchronous, step-down, DC-to-DC switching controllers designed with a wide range of features and functions for its application field. It offers current and voltage mode control, wide input voltage range, adjustable switching frequency and output voltage tracking, as well as several protections such as overvoltage, overload, and soft start. Its suitable applications include distributed power systems, point-of-load regulators, DC-DC adapters, polarity inverters, telecom and broadcast equipment, consumer electronics, and battery management systems.

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