LTC3872IDDB-1#TRPBF

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The LTC3872IDDB-1#TRPBF is a high performance synchronous DC/DC Step-Down controller with low output ripple and low quiescent current. The device includes a high-side MOSFET driver and a low-side MOSFET driver, each with independent controls, allowing use in a variety of step-down and self-sustaining DC/DC converter topologies. The wide input voltage range and high frequency operation combined with the extremely low output-voltage drop resulting from the low MOSFET on-resistance makes the LTC3872IDDB-1#TRPBF an ideal for use in distributed point-of-load and general purpose power supplies.

Application Field

The LTC3872IDDB-1#TRPBF can operate from input voltages from 8V up to 45V. With a wide input range and up to 5 A output current, it’s suitable for applications such as isolated dc/dc PoL regulators and distributed bus architectures, as well as for automotive, avionics and telecom power supplies. This device can be used for high efficiency, high output current operation with low output voltage ripple. It can also be employed in energy harvesting applications, such as solar power supplies, as it is capable of sustained transient loads up to 10 times greater than the continuous load specification.

Working Principle

The LTC3872IDDB-1#TRPBF uses the current mode architecture to control the output voltage. The voltage regulation is achieved by controlling the current through an inductor. The peak inductor current is measured directly by the current sense resistor while the slope of the inductor current can be sensed from the voltage across the sense resistor. The peak current sense voltage (VCS) is compared with a reference current threshold (ILIM). When the peak current reaches the current limit set by ILIM, a comparator generates a VLIM signal, which shuts off the internal high side MOSFET if the voltage on the VLIM pin exceeds the voltage of the VLIM threshold.

The output voltage is regulated by sensing the output voltage via the FB pin. The feedback voltage is compared against an internal reference voltage (VREF). An error voltage is generated proportional to the difference between the VREF and FB voltages and is used to set the current limit of the high side MOSFET. In order to reduce the transition time between load steps, a sense resistor (RSNS) is used to measure the output voltage. The RSNS voltage is amplified by the error amplifier and compared to the FB voltage, providing fast response time for load transients.

The device also features low quiescent current and is capable of delivering up to 5 A of output current. The operating frequency is programmable from 500 kHz to 2.5 MHz, allowing for optimal design performance. The device includes a soft-start control, which can be programmed to increase the output voltage gradually in order to reduce inrush current during startup. The device also includes protective features to avoid damage due to excessive power dissipation in the event of an overtemperature or overvoltage condition.

Conclusion

The LTC3872IDDB-1#TRPBF provides a high performance solution for DC/DC switching controllers in a wide variety of distributed power systems. Its high frequency operation combined with low output voltage ripple and low quiescent current make it ideal for use in automotive, avionics and telecom power supplies, as well as distributed point-of-load and self-sustaining circuit architectures. The device also features protection against excessive power dissipation and overvoltage conditions, making it an excellent choice for reliable and efficient operations.

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