Linear Technology Corporation introduced LTC3892, a new type of high-voltage dual output synchronous step-down DC-DC controller. When one output is valid, it consumes only 29��A current; when two outputs When enabled at the same time, its current consumption is 34��A.
The 4.5V to 60V input power range is designed to prevent high voltage transients, thereby ensuring continuous operation during a car's cold start and adapting to various input sources and battery chemistry. When the output current exceeds 20A, each output can be set to 0.8V to 99% of VIN, and the efficiency is as high as 96%, which is very suitable for 12V or 24V automotive, heavy equipment, industrial control, robotics and telecommunications applications.
The LTC3892 // 1's adjustable 5V to 10V gate driver enables the use of logic or standard MOSFETs to maximize efficiency. It operates at a selectable fixed frequency between 50kHz and 900kHz and can be synchronized with an external clock from 75kHz to 850kHz. Users can choose from continuous operation, pulse skipping and low ripple burst mode? Run under light load. The 2-phase operation of the LTC3892 // 1 reduces input filtering and capacitor requirements. Its current-mode architecture provides easy loop compensation, fast transient response, fixed-frequency operation, excellent line regulation, and the ability to easily share current with parallel phases for higher currents. The highest efficiency can be achieved by measuring the voltage drop across the output inductor (DCR), or by using an optional sense resistor for high accuracy. Current foldback limits MOSFET heat dissipation during overload conditions. The device is available in two versions. The LTC3892 is a fully functional part with two power good signals, adjustable current limit and fixed 3.3V or 5V output voltage options.
The LTC3892 is available in a 32-lead 5mm x 5mm QFN package, while the LTC3892-1 is available in a 28-lead TSSOP package. The company said that there are four temperature grades to choose from, the extended and industrial grade operating temperature range is -40 to 125C, the high temperature temperature range of the car is -40C to 150C, and the military-grade "guaranteed" temperature range is -55C. To 150C.
