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 TestApplication
SCSI-2 Active Terminator
High Efficiency Linear Regulators
Post Regulators for Switching Supplies
Constant Current Regulators
Battery Chargers
Microprocessor SupplyPinout
SpecificationsPower Dissipation................................Internally Limited
Input Voltage (Note 1)............................................. 30V
Operating Input Voltage
Adjustable Devices.................................................. 25V
2.85V Devices ........................................................ 18V
3.3V, 3.6V, and 5V Devices...................................... 20V
12V Devices ............................................................ 25V
Operating Junction Temperature Range
"C" Grades
Control Section ......................................0°C to 125°C
Power Transistor....................................0°C to 150°C
"I" Grades
Control Section ................................ 40°C to 125°C
Power Transistor.............................. 40°C to 150°C
"M" Grades
Control Section ................................ 55°C to 150°C
Power Transistor.............................. 55°C to 200°C
Storage Temperature Range.............65°C to 150°C
Lead Temperature (Soldering, 10 sec)................300°C
Description
The LT (R)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 speci- fied as a function of load current. Dropout is guaranteed at a maximum of 1.5V at maximum output current, decreas- ing 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 adjust- able regulators. A 10F 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 termi- nation. 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 quies- cent current flows into the load, increasing efficiency.
LT1086 Data Sheet
