LT1087

The LT1087 is a variation of the LT1084 adjustable low dropout 3 Terminal Regulator. The sense points of the internal referencelerror amp are brought out to allow added flexibility.They can be used for true Kelvin sensing of the output voltage at a remotely located load. They can be used to force the devices to share current equally when more than one device is wired in parallel, allowing the user to easily build higher current modules.This device is designed to provide 5A of output current.

Features of the LT1087 are:(1)separate sense inputs allow true kelvin sensing; (2)easily parallelable; (3)operates down to 1v dropout; (4)guaranteed dropout voltage at multiple current levels; (5)0.05% line regulation; (6)0.1% load regulation at the sense point. All internal circuitry is designed to operate down to 1V input to output differential and the dropout voltage is fully specified as a function of load current. On-chip trimming adjusts the reference voltage to 1%.Current limit is also trimmed, minimizing the stress on both the regulator and power source circuitry under overload conditions. A 10 F output capacitor is required on these devices; however, this is usually included in most regulator designs.

The absolute maximum ratings of the LT1087 can be summarized as:(1)input to output voltage differental:35V;(2)storage temperature:-65 to 150;(3)operating junction temperature range:-55 to 150;(4)power dissipation:internally limited;(5)lead temperature:300.Dropout voltage is specified over the full output current range of the device. Test points and limits are shown on the Dropout Voltage curve.Dropout voltage is defined to be the voltage from input to output and is tested with the sense pins tied to the output pin.The LT1087 is an adjustable voltage regulator with Kelvin sense inputs. These inputs can be used to fully Kelvin sense a remote load so that the regulation at the load is nearly perfect. The sense inputs can also be used in a 2-wire configuration to compensate for voltage drops in long output leads eliminating the two extra wires needed for full Kelvin sensing.