DESCRIPTION

The LT ®1086 is designed to provide 1.5A with higher efficiency than currently available devices. 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. Dropout is guaranteed at a maximum of 1.5V at maximum output current, decreasing at lower load currents. On-chip trimming adjusts the reference/ouput voltage to 1%. Current limit is also trimmed, minimizing the stress on both the regulator and power source circuitry under overload conditions.

The LT1086 is pin compatible with older 3-terminal adjustable regulators. A 10µF output capacitor is required on these new devices; however, this is usually included in most regulator designs.

A 2.85V output version is offered for SCSI-2 active termination. For surface mount applications see the LT1117-2.85 data sheet. For high current or lower dropout require ments see the LT1123-2.85 data sheet.

Unlike PNP regulators, where up to 10% of the output current is wasted as quiescent current, the LT1086 quiescent current flows into the load, increasing efficiency.

FEATURES

■ 3-Terminal Adjustable or Fixed

2.85V, 3.3V, 3.6V, 5V, 12V

■ Output Current of 1.5A, (0.5A for LT1086H)

■ Operates Down to 1V Dropout

■ Guaranteed Dropout Voltage at Multiple Current Levels

■ Line Regulation: 0.015%

■ Load Regulation: 0.1%

■ 100% Thermal Limit Functional Test

APPLICATIONS

■ SCSI-2 Active Terminator

■ High Efficiency Linear Regulators

■ Post Regulators for Switching Supplies

■ Constant Current Regulators

■ Battery Chargers

■ Microprocessor Supply