The LM1085 is a regulator with a maximum dropout of 1.5 V at 3 A of load current. It 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 LM1085. Fixed output voltage versions integrate the adjust resistors.
The LM1085 circuit includes a zener trimmed bandgap reference, current limiting and thermal shutdown.
Refer to the LM1084 for the 5A version, and the LM1086 for the 1.5A version.
Part number | Order | Output options | Iout (Max) (A) | Vin (Max) (V) | Vin (Min) (V) | Vout (Max) (V) | Vout (Min) (V) | Fixed output options (V) | Package Group | Features | Regulated outputs (#) | Operating temperature range (C) | Thermal resistance θJA (°C/W) | Noise (uVrms) | Approx. price (US$) | Rating | PSRR @ 100 KHz (dB) | Accuracy (%) | Dropout voltage (Vdo) (Typ) (mV) | Iq (Typ) (mA) | Package size: mm2:W x L (PKG) |
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
LM1085 |
|
Adjustable Output
Fixed Output |
3 | 29 | 2.6 | 27.5 | 1.25 |
3.3
5 12 |
DDPAK/TO-263 | 3
TO-220 | 3 |
1 | -40 to 125 | 23 | 38 | 0.74 | 1ku | Catalog | 30 | 4 | 1300 | 5 |
3DDPAK/TO-263: 155 mm2: 15.24 x 10.16 (DDPAK/TO-263 | 3)
3TO-220: 47 mm2: 4.58 x 10.16 (TO-220 | 3) |
|
LM1084 |
|
Adjustable Output
Fixed Output |
5.5 | 29 | 2.6 | 27.5 | 1.25 |
3.3
5 |
DDPAK/TO-263 | 3
TO-220 | 3 |
1 | -40 to 125 | 23 | 38 | 1.00 | 1ku | Catalog | 30 | 1.5 | 1300 | 5 |
3DDPAK/TO-263: 155 mm2: 15.24 x 10.16 (DDPAK/TO-263 | 3)
3TO-220: 47 mm2: 4.58 x 10.16 (TO-220 | 3) |
|
LM1086 |
|
Adjustable Output
Fixed Output |
1.5 | 29 | 2.6 | 27.5 | 1.25 |
1.8
2.5 3.3 5 |
DDPAK/TO-263 | 3
TO-220 | 3 WSON | 8 |
1 |
0 to 125
-40 to 125 |
23 | 38 | 0.72 | 1ku | Catalog | 30 | 2 | 1300 | 2 |
3DDPAK/TO-263: 155 mm2: 15.24 x 10.16 (DDPAK/TO-263 | 3)
3TO-220: 47 mm2: 4.58 x 10.16 (TO-220 | 3) 8WSON: 16 mm2: 4 x 4 (WSON | 8) |
|
LM323-N | Samples not available | Fixed Output | 3 | 20 | 7.5 | 5 | 5 | 5 | TO-3 | 2 | 1 | 0 to 125 | 35 | 40 | 42.01 | 1ku | Catalog | 55 | 2 | 1900 | 12 | 2TO-3: 969 mm2: 24.89 x 38.94 (TO-3 | 2) |