Linear Technology’s LT3081 is a rugged 1,5 A linear regulator with an extended safe operating area (SOA), making it ideal for high input-to-output voltage and high output current applications where older regulators limit the output.
It uses a current source reference for single-resistor output voltage settings and output adjustability down to ‘0’. Output current limit can be set externally with a single resistor.
The regulator architecture, combined with low millivolt regulation, enables multiple ICs to be paralleled easily for heat spreading and higher output current. The current from the device’s current monitor can be summed with the set current for line-drop compensation, where the output of the LT3081 increases with current to compensate for line drops.
The IC achieves line and load regulation of under 2 mV independent of output voltage and features an input voltage range from 1,2 V to 40 V. The device fits well in applications requiring multiple rails. Output voltage is programmable with a single resistor from 0 V to 38,5 V with a 1,2 V dropout. The on-chip trimmed 50 μA current reference is ±1% accurate.
The regulation, transient response and output noise (30 μVrms) are independent of output voltage due to the device’s voltage follower architecture. The LT3081 is configurable as a 2-terminal current source with just two resistors. Input or output capacitors for stability are optional in either linear regulator or current-source mode of operation.
The device provides several monitoring and protection functions. Current limit, accurate to ±10%, can be programmed with a single resistor. Monitor outputs provide a current output proportional to temperature (1 μA/°C) and output current (200 μA/A), allowing easy ground-based measurement. The current monitor can be used to compensate for cable drops. The LT3081’s internal protection circuitry includes reverse input protection, reverse current protection, internal current limiting and thermal shutdown.
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