LTC3882IUJ-1#TRPBF

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The LTC3882IUJ-1#TRPBF is an integrated controller and power MOSFET driver that offers current mode, pulse width modulation (PWM) control with accurate current sensing, adaptive on-time control and an adjustable oscillator frequency. This device is designed for high-performance synchronous DC/DC buck switching regulator applications, and drives n-channel MOSFETs at up to 35V, current up to 20A, using 200kHz switching frequency. This device has excellent line and load regulation, integrated gate drive, adjustable current limiting and features protection functions, including cycle-by-cycle current limiting and thermal shutdown.

Application Field

The LTC3882IUJ-1#TRPBF is well suited for Variable Frequency and Variable Voltage DC/DC conversion applications. Its wide input voltage range and high switching frequency make it an ideal choice to achieve the highest power density from a single chip. The LTC3882IUJ-1#TRPBF can be used in various applications, such as automotive systems, LED lighting, motor control and LED backlighting installation.

Working Principle

This device is based on current mode control with on-time regulation, switching at a fixed frequency, thus operating insensitive to charge or load conditions. It uses an internal voltage reference and a fixed oscillator frequency to maintain a constant switching frequency. The LTC3882IUJ-1#TRPBF has an adjustable peak current set point (ILIM) to limit peak current through the MOSFET. The adaptive on-time control allows the device to keep a fixed switching frequency over a wide load range with precise current regulation over the entire load range.

When the device is turned on, a single-shot circuit runs and switches the output to the high side (VOUT) or low side (GND) depending on the input voltage. This single-shot is multiplexed with the switching timer to provide a precise frequency. The on-time is then adjusted according to the peak current threshold as follows: if the current is lower than the peak current set point (ILIM), the on-time increases to allow a higher output current. If the current is higher than the peak current set point, the on-time decreases.

The device features a power Good flag that helps to keep the output voltage stable and in regulation during transient states. Additionally, over-voltage and over-temperature protection circuits are included for safe operation. The device can be shut down by pulling the enable pin low. The LTC3882IUJ-1#TRPBF is an advanced DC/DC switching regulator controller, ideally suited for high-efficiency, high-power density designs.

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