LT3667HMSE#PBF

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The LT3667HMSE#PBF is a DC/DC linear/switching step-up bus converter with a wide input voltage range of 3V to 20V and an adjustable output voltage range of 1V to 17V. It is ideal for point-of-load supplies and high-power, low-cost and low-noise applications.The LT3667HMSE#PBF implements combining a linear regulator with a switching regulator in order to improve efficiency while still maintaining good step-up performance. It operates in four different switching modes, including burst modeoperation: PWM, PFM, continuous conduction mode (CCM) and discontinuous conduction mode (DCM).Linear Regulator operation of the LT3667HMSE#PBF is based upon a wide voltage range that can achieve conversions from 3V to over 20V output. The voltage is adjusted with a linear regulator, which uses a control loop to adjust the output voltage to achieve a constant output current. The linear regulator employs a low-noise, high-current internal MOSFET and an external voltage sense resistor to keep the output voltage directly proportional to the input voltage.To enable efficient operation and high-power operation for the LT3667HMSE#PBF, a switching regulator is employed. A switch is connected between a power supply and a capacitor, which is set to be switched on and off at a given frequency to draw power from the power supply. This switched power is converted to output voltage through a transformer, inductor and diode. The output voltage can be set by controlling the duty cycle of the switch, which is achieved by regulating the current in the switch. The switching regulator can operate in several different modes, including PWM and PFM.In burst mode operation, the LT3667HMSE#PBF implements a low-noise, low-ripple switching regulator. With this mode, the chip rapidly switches on and off to reduce noise and ripple when the output voltage is low. This mode is ideal for noise-sensitive applications, such as audio amplifiers.In continuous conduction mode (CCM), the switch stays on continuously. This mode works best when the output current is high and the output voltage is constant. The LT3667HMSE#PBF also offers low-noise and low-ripple operation in this mode, making it ideal for applications that require low noise.Finally, in discontinuous conduction mode (DCM), the switch is switched on and off at a predetermined frequency. This operation works best when the output current is low and the output voltage is variable. DCM allows for efficient conversion of a wide range of input voltages, making it suitable for high power applications.In summary, the LT3667HMSE#PBF DC/DC linear/switching step-up bus converter is a highly efficient, low-noise solution for a wide range of high-power, low-cost, and low-noise applications. With its high power conversion capabilities, adjustable output voltages, and low noise operation, it can meet the demands of most modern day applications.

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