Absolute Maximum Ratings (Note 1)

If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications.

Maximum Input to Output Voltage Differential

LM1085-ADJ

29V

LM1085-12

18V

LM1085-3.3

27V

LM1085-5.0

25V

Power Dissipation (Note 2)

Internally Limited

Junction Temperature (TJ)(Note 3)

150˚C

Storage Temperature Range

-65˚C to 150˚C

Lead Temperature

260˚C, to 10 sec

ESD Tolerance (Note 4)

2000V

Operating Ratings (Note 1)

Junction Temperature Range (TJ) (Note 3)

Control Section

−40˚C to 125˚C

Output Section

−40˚C to 150˚C

LM1085

Electrical Characteristics

Typicals and limits appearing in normal type apply for TJ = 25˚C. Limits appearing in Boldface type apply over the entire junc- tion temperature range for operation.

Symbol

Parameter

Conditions

Min

Typ

Max

Units

(Note 6)

(Note 5)

(Note 6)

 

 

 

 

 

 

 

 

 

 

 

VREF

Reference Voltage

LM1085-ADJ

 

 

 

 

 

 

IOUT = 10mA, VIN−VOUT = 3V

1.238

1.250

1.262

V

 

 

10mA ≤IOUT ≤ IFULL LOAD,1.5V ≤ (VIN−VOUT) ≤ 15V

1.225

1.250

1.270

V

 

 

(Note 7)

 

 

 

 

 

 

 

 

 

 

 

VOUT

Output Voltage

LM1085-3.3

3.270

3.300

3.330

V

 

(Note 7)

IOUT = 0mA, VIN = 5V

 

3.235

3.300

3.365

V

 

 

0 ≤ IOUT ≤IFULL LOAD, 4.8V≤ VIN ≤15V

 

 

 

 

 

 

 

 

LM1085-5.0

4.950

5.000

5.050

V

 

 

IOUT = 0mA, VIN = 8V

 

 

4.900

5.000

5.100

V

 

 

0 ≤ IOUT ≤ IFULL LOAD, 6.5V ≤ VIN ≤ 20V

 

 

 

 

 

 

 

 

LM1085-12

11.880

12.000

12.120

V

 

 

IOUT = 0mA, VIN = 15V

 

 

11.760

12.000

12.240

V

 

 

0 ≤ IOUT ≤ IFULL LOAD, 13.5V ≤ VIN ≤ 25V

 

 

 

 

 

 

∆VOUT

Line Regulation

LM1085-ADJ

 

0.015

0.2

%

 

(Note 8)

IOUT =10mA, 1.5V≤ (VIN-VOUT) ≤ 15V

 

0.035

0.2

%

 

 

LM1085-3.3

 

0.5

6

mV

 

 

IOUT = 0mA, 4.8V ≤ VIN ≤ 15V

 

1.0

6

mV

 

 

LM1085-5.0

 

0.5

10

mV

 

 

IOUT = 0mA, 6.5V ≤ VIN ≤ 20V

 

1.0

10

mV

 

 

LM1085-12

 

1.0

25

mV

 

 

I OUT =0mA, 13.5V ≤ VIN ≤ 25V

 

2.0

25

mV

∆VOUT

Load Regulation

LM1085-ADJ

 

0.1

0.3

%

 

(Note 8)

(VIN-V OUT) = 3V, 10mA ≤ IOUT ≤ IFULL LOAD

 

0.2

0.4

%

 

 

LM1085-3.3

 

3

15

mV

 

 

VIN = 5V, 0 ≤ IOUT ≤ IFULL LOAD

 

7

20

mV

 

 

LM1085-5.0

 

5

20

mV

 

 

VIN = 8V, 0 ≤ IOUT ≤ IFULL LOAD

 

10

35

mV

 

 

LM1085-12

 

12

36

mV

 

 

VIN = 15V, 0 ≤ IOUT ≤ IFULL LOAD

 

24

72

mV

 

Dropout Voltage

LM1085-ADJ, 3.3, 5, 12

 

 

 

 

 

(Note 9)

∆VREF, ∆VOUT = 1%, IOUT = 3A

 

1.3

1.5

V

3

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National Instruments LM1085 Series manual Absolute Maximum Ratings Note, Operating Ratings Note, Electrical Characteristics
Page 2 Page 4

LM1085 Series specifications

The National Instruments LM1085 Series is a range of low-dropout (LDO) voltage regulators that are designed for various applications requiring precise voltage regulation and minimal power loss. This series is particularly known for its high efficiency and excellent thermal performance, making it suitable for both consumer electronics and industrial systems.

One of the standout features of the LM1085 series is its low dropout voltage, typically around 1.5V at maximum load. This characteristic allows these regulators to function effectively even with minimal headroom, which is essential for battery-powered applications. The series supports output voltages of 1.25V to 3.3V, enabling designers to tailor the voltage output to meet specific requirements, thereby enhancing system flexibility.

The LM1085 series incorporates several advanced technologies. It utilizes a high-speed, low-noise architecture, which contributes to stable operation across a variety of load conditions. Additionally, the regulators have built-in protection features, including thermal shutdown and current limiting, which prevent damage due to overheating or short-circuits.

Another characteristic that sets the LM1085 series apart is its ability to deliver a maximum output current of 3A, catering to applications with higher power requirements. This makes it an excellent choice for powering microcontrollers, sensors, and other digital circuitry that demand stable voltage levels.

The LM1085 series is also compatible with a range of external components, such as capacitors and inductors, allowing engineers to customize their designs based on specific requirements, including transient response and load variation. Furthermore, its low noise output makes it ideal for sensitive applications in audio processing and communication systems.

In summary, the National Instruments LM1085 Series stands out due to its low dropout voltage, high current capacity, integrated protection features, and compatibility with external components. Its efficient design makes it a preferred choice for applications where precise regulation and efficiency are paramount. Whether for consumer electronics, automotive, or industrial systems, the LM1085 series offers reliable performance that meets the needs of modern electronic designs.
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