LM385-ADJ Adjustable Micropower Voltage Reference | TI.com

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Adjustable Micropower Voltage Reference


Recommended alternative parts

  • LM4051-N  -  Improved Initial Accuracy And Temperature Coefficient
  • LM285-ADJ  -  -40 to 85 °C Extended temperature range
  • LM185-ADJ  -  -55 to 125°C Extended temperature range


The LM185/LM285/LM385 are micropower 3-terminal adjustable band-gap voltage reference diodes. Operating from 1.24 to 5.3V and over a 10μA to 20mA current range, they feature exceptionally low dynamic impedance and good temperature stability. On-chip trimming is used to provide tight voltage tolerance. Since the LM185 band-gap reference uses only transistors and resistors, low noise and good long-term stability result.

Careful design of the LM185 has made the device tolerant of capacitive loading, making it easy to use in almost any reference application. The wide dynamic operating range allows its use with widely varying supplies with excellent regulation.

The extremely low power drain of the LM185 makes it useful for micropower circuitry. This voltage reference can be used to make portable meters, regulators or general purpose analog circuitry with battery life approaching shelf life. Further, the wide operating current allows it to replace older references with a tighter tolerance part.

The LM185 is rated for operation over a −55°C to 125°C temperature range, while the LM285 is rated −40°C to 85°C and the LM385 0°C to 70°C. The LM185 is available in a hermetic TO package and a LCCC package, while the LM285/LM385 are available in a low-cost TO-92 package, as well as SOIC.


  • Adjustable from 1.24V to 5.30V
  • Operating Current of 10μA to 20mA
  • 1% and 2% Initial Tolerance
  • 1Ω Dynamic Impedance
  • Low Temperature Coefficient

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WEBENCH® Designer LM385-ADJ

  Min   Max Range
Vin  V 1.24 to 5.3V
Vout  V 1.241 to 5.3V
Iout  A ≤ 0.02A
Ambient Temp  °C 0 to 70°C


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Part number Order Reference voltage VO (V) VO adj (Min) (V) VO adj (Max) (V) Initial accuracy (Max) (%) Temp coeff (Max) (ppm/ degree C) Rating Operating temperature range (C) Iz for regulation (Min) (uA) Iout/Iz (Max) (mA) Package Group Iref (uA) I I(dev) (uA)
LM385-ADJ Order now Adjustable     1.24     1.24     5.3     1
150     Catalog     0 to 70     10     20     SOIC | 8
TO-92 | 3    
0.016     0.019    
LM4030 Order now Fixed     2.5
2.5     4.096     0.05
Catalog     -40 to 125     120     30     SOT-23 | 5        
LM4041-N Order now Adjustable
1.225     1.24     10     0.1
Catalog     -40 to 125
-40 to 85    
60     12     SC70 | 5
SOT-23 | 3
TO-92 | 3    
0.06     0.09