LT3758AIDD#PBF

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The LT3758AIDD#PBF is a part of a family of DC-to-DC switching controllers that offer multiple advanced features including integrated current-mode control, advanced diagnostics and protection capabilities, and a robust mode of operation. The LT3758AIDD is a cost-effective solution for a wide variety of relatively high-power switching voltage regulator applications. This application field includes Universal Serial Bus (USB) charging, battery charging, adaptive power-supply applications, and small tuned DC-DC converter systems. It is highly suitable for low-cost, small-size boards and those that are designed for low power-dissipation.

The LT3758AIDD is designed for off-line, high current switched-mode power supplies using a single-switch forward or flyback topology. The operating frequency from 100kHz to 2MHz is adjustable via an external resistor and/or capacitor. The part also has two adjustable current-limit stages, which are used to protect the part in the event of overcurrent. The LT3758AIDD features wide input voltage range from 6V to 600V and output voltage range from 0.5V to 80V. The wide operating temperature range of -40C to 125C makes the LT3758AIDD suitable for applications in harsh environments.

The LT3758AIDD switching controllers offer an array of features to enhance performance of the switching regulator application. These features include frequency modulation, programmable oscillator frequency, two current limit stages adjustability, under-voltage lockout, and soft-start. Additionally, the LT3758AIDD offers optional disconnect features. The device is configurable to drive an N-channel totem-pole or a P-channel synchronous MOSFET switch. The programmable function logic has several protection control functions including short circuit protection, over-voltage protection, and over-temperature protection. All of these features make the LT3758AIDD an ideal choice for multi-output, multi-topology, and multi-chip converter designs.

The LT3758AIDD utilizes a current-mode control architecture to ensure fast transient response, excellent load and line regulation, and robust operation in the presence of load and line transients. The current-mode control also offers low-dissipation operation for low power operation. The LT3758AIDD incorporates an internal loop compensation set up for stability and fast load transient response, making it easy to use and reduces the need for external components. The second stage current limit feature, allows fast loop response and the ability to work with distorted input sources. The wide input and output voltage range, and adjustable current-limit allows designers flexibility in the choice of part for their power supply design.

The LT3758AIDD switching controllers also integrate an on-chip, high current totem pole driver stage and multiple high drive outputs that can be used to control the topology of the power supply. The adjustable dead time control, frequency synchronization, and an optional synchronous rectifier control are some of the features offered on the LT3758AIDD. The parts also have an adjustable comparator threshold level to start the switching cycle and an adjustable soft-start pin. The parts also feature inrush- current limiting to protect against short circuits, spread-spectrum frequency modulation for noise-sensitive applications, and an adjustable UVLO for additional safety and protection.

The LT3758AIDD switching controller is a highly versatile solution for a broad range of applications, from battery chargers, to audio circuits and automotive systems. Its small size and excellent performance make it a great choice for low-cost, low-power, and efficient power-supply designs. Its forced-current-mode architecture provides excellent transient response, high efficiency and output accuracy. The frequency flexibility and the wide current-mode operating range, along with the adjustable dead time control, frequency synchronization and optional synchronous rectifier control, make it an ideal solution for multiple and complex power supply applications.

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