The LM1084 is a low dropout voltage regulator with a maximum dropout of 1.5V at 5A of load current. It has the same pin-out as National Semiconductor’s industry standard LM317. The LM1084 is available in an adjustable version, which can set the output voltage with only two external resistors. It is also available in three fixed voltages: 3.3V, 5.0V and 12.0V. The fixed versions intergrate the adjust resistors. The LM1084 circuit includes a zener trimmed bandgap ref- erence, current limiting and thermal shutdown. The LM1084 series is available in TO-220 and TO-263 pack- ages. Refer to the LM1085 for the 3A version, and the LM1086 for the 1.5A version.
The LM1084 series are low‑dropout positive voltage regulators capable of delivering up to 5 A with a maximum dropout of 1.5 V. The family includes an adjustable version and three fixed‑output versions (3.3 V, 5.0 V, 12.0 V) and is offered in TO‑220 and TO‑263 packages.
The document lists absolute maximum ratings, detailed electrical characteristics, typical performance curves, mechanical dimensions, and application notes covering stability, ripple rejection, load regulation, and protection diode usage. It also contains ordering information and a life‑support policy disclaimer.
| Maximum Output Current | 5 A |
|---|---|
| Dropout Voltage (typical) | 1.5 V at 5 A |
| Line Regulation (typical) | 0.015 % |
| Load Regulation (typical) | 0.1 % |
| Operating Temperature Range | -40 °C to 125 °C |
| Package Types | TO‑220, TO‑263 |
The LM1084 can deliver up to 5 A of load current.
Fixed‑output versions are available at 3.3 V, 5.0 V, and 12.0 V.
The device includes current limiting and thermal shutdown protection.
A 10 µF tantalum or 50 µF aluminum electrolytic capacitor is recommended for most applications.