LTC3864IDE#TRPBF

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The LTC3864IDE#TRPBF is a polyphase, synchronous, high current step-down switching regulator controller designed to deliver clean, continuous power to multiple core, multi-rail applications operating up to 90% efficiency. The integrated features of the LTC3864IDE#TRPBF make it ideal for supplying the current needs of today’s high performance processors and FPGAs. The regulator provides simultaneous voltage and current regulation by measuring the output current with a dedicated pin and automatically adjusting the current limit in response to changing input and output conditions.

Applications

The LTC3864IDE#TRPBF can be used in a variety of advanced power management applications, including server, workstation, telecommunications, embedded, and consumer applications. The regulator can be used to supply high performance processors and FPGAs, as well as sequential multiple rail power systems and configurable step-down power systems. The wide input voltage range of 4.5 V to 36 V makes it suitable for powering applications from a variety of sources, including universal AC-DC power supplies, battery packs or DC sources.

Features

The LTC3864IDE#TRPBF features a wide input voltage range, adjustable output voltage down to 0.6 V, and adjustable current limit. It can achieve up to 90% efficiency, operates up to 32 A of load current, and has a peak current limit of 96 A to protect today’s advanced processors and FPGAs. The synchronous operation of the controller supports a wide range of output current requirements, allowing the use of fewer components, lower costs, and simpler designs. It features programmable soft-start, adjustable frequency, multiple enable/disable functions, programmable voltage margin and output voltage tracking, and adjustable slope compensation. On the fly switching frequency and current limit adjustments with the LTC3864IDE#TRPBF ensure superior current and thermal performance by allowing the switching frequency to be adjusted in response to changing input and output conditions.

Working Principle

The LTC3864IDE#TRPBF utilizes a synchronous buck topology, with a controller IC, dual power MOSFETs, and a minimum number of other components. The controller IC monitors the load and input voltage and adjusts the switching frequency, output voltage, and current limit to ensure system stability independent of component and load variations. The controller IC works by first sensing the current through the power MOSFETs using the source pins of each power MOSFET. This current sense information is then used to calculate the output voltage, the current limit, and the switching frequency in order to regulate the system. The output voltage is adjusted by varying the duty cycle of the power MOSFETs, while the current limit is adjusted by charge balancing at the source pins of each power MOSFET and by adjusting the switching frequency. The switching frequency is adjusted by varying the on-time of the power MOSFETs.

Conclusion

In summary, the LTC3864IDE#TRPBF is a polyphase, synchronous, high current step-down switching regulator controller designed to deliver clean, continuous power to multiple core, multi-rail applications operating up to 90% efficiency. The integrated features of the controller make it ideal for supplying the current needs of today’s high performance processors and FPGAs. The synchronous operation of the controller supports a wide range of output current requirements, and allows for adjustments of the switching frequency, current limit, and output voltage in response to varying input and output conditions. The LTC3864IDE#TRPBF is an ideal solution for a variety of advanced power management applications, such as those in server, workstation, telecommunications, embedded, and consumer applications.

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