LTC3872HTS8#TRPBF

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LTC3872HTS8#TRPBF is a high performance monolithic synchronous step-down controller, featuring a constant frequency PWM current mode control architecture. This device is designed to drive N-channel power stages with up to 8A of output current and up to 42V input supply. Its optimized control loop provides fast transient response, while its wide range of programmable feedback loop compensation allows designers to quickly and accurately specify the system dynamics needed to meet application requirements.The LTC3872HTS8#TRPBF features a floating channel to allow operation with high performance external N-channel MOSFETs. Its low EMI, low input current ripple guarantee high efficiency across the entire load range while the output voltage is adjustable from 0.8V to VIN. Its Pulse-by-Pulse Current Limit ensures excellent load and line transient performance.The device includes a suite of protection features including programmable thermal shutdown, LED open-drain output, output overvoltage protection and external driver shutdown. It also includes a soft-start for smooth current ramping and a precision voltage reference for output regulation accuracy.Application FieldThe LTC3872HTS8#TRPBF is ideal for applications in industrial, automotive, computing and consumer electronics. It is well suited for point of load (POL) or intermediate DC/DC converter applications including telecom, networking, distributed power systems and automotive applications.Working PrincipleThe LTC3872HTS8#TRPBF employs a constant duty second-order PWM architecture (based on average inductor current) to achieve fast transient response and good light load efficiency.In continuous conduction mode (CCM) operation, the controller regulates the output voltage by controlling the average inductor current and the difference between the input voltage and the output voltage. In discontinuous conduction mode (DCM) operation, the output voltage is regulated by controlling the inductor current zero-to-peak and the difference between the input voltage and the output voltage.The LTC3872HTS8#TRPBF provides a range of protections including overcurrent and overvoltage, as well as programmable thermal shutdown. The output voltage is adjustable via the external resistor divider, and the adjustable soft start reduces inrush current at turn-on.ConclusionThe LTC3872HTS8#TRPBF is a high performance, high efficiency monolithic synchronous step-down controller. Its optimized control loop and wide range of programmable feedback loop compensation allows designers to quickly and accurately specify the system dynamics needed to meet application requirements. Its low EMI, low input current ripple guarantee high efficiency across the entire load range and its wide range of protection features ensure safety and reliability.

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