The LM1086 is a regulator with a maximum dropout of 1.5 V at 1.5 A of load current. The
device has the same pin-out as TIs industry standard LM317.
Two resistors are required to set the output voltage of the adjustable output voltage
version of the LM1086. Fixed output voltage versions integrate the adjust resistors. Typically, no
input capacitor is needed unless the device is situated more than 6 inches from the input filter
capacitors. Output capacitor can be replaced with ceramic and appropriate ESR.
The LM1086 circuit includes a zener trimmed bandgap reference, current limiting, and
thermal shutdown. Because the LM1086 regulator is floating and detects only the input-to-output
differential voltage, supplies of several hundred volts can be regulated as long as the maximum
input-to-output differential is not exceeded. Exceeding the maximum input-to-output deferential
will result in short-circuiting the output. By connecting a fixed resistor between the adjustment
pin and output, the LM1086 can be also used as a precision current regulator.
For applications requiring greater output current, refer to LM1084 (clickable link) for the 5-A version, and the LM1085 (clickable link) for the 3-A version.