60V low Iq step-down with adjustable grid drive

    In battery-powered applications where low idle current must be maintained, low IQ of LTC3892 is essential. It has 29 μ No-load quiescent current of A and 3.9 μ A‘s shutdown current can keep the battery charged for as long as possible. The wide input voltage range of LTC3892 can meet the stringent requirements of industrial and automotive applications, which are characterized by the lack of stable and high-quality voltage sources. For example, in the automotive environment, during cold start and sudden load drop, the range of 12V nominal voltage rail can be from 5V to more than 50V. The LTC3892‘s ability to maintain output in the face of high voltage input eliminates expensive voltage suppressors; When the input voltage drops far below the nominal value, its low input can maintain uninterrupted logic power supply.

    Another key feature of the LTC3892 is its programmable gate voltage, which can be set in the range of 5V to 10V. This is important for many reasons. Designers can choose standard (10V) gate drive level and select switching devices from various MOSFETs provided by multiple suppliers to optimize power efficiency and reduce overall cost. However, if the gate driver loss is important, the logic level (5V) FET can be used. As a compromise, the gate voltage can be programmed to any intermediate value to provide acceptable gate and conduction loss 1. The LTC3892 has programmable undervoltage lockout (UVLO) and programmable EXTV CC through the DRVUV pin.