LM385BDM-12 datasheet, PDF - EEWORLD Datasheet

LIN D

O C

#:

385

LM385/385B

1.2 & 2.5V M

I C R O P O W E R

V

O LTA G E

R

E F E R E N C E

T

H E

I

N F I N I T E

P

O W E R

O F

I

N N O VA T I O N

P

R O D U C T I O N

D

A T A

S

H E E T

DESCRIPTION

The LM385/385B Micropower Voltage

References are two terminal bandgap

reference diodes designed and optimized

for accurate low power operation in

portable and other power sensitive

systems. Operating currents are

guaranteed from as low as 15µA up to

20mA for the LM385/385B-1.2, and 20µA

up to 20mA for the LM385/385B-2.5,

giving designers a great deal of flexibility

in optimizing power consumption, noise

and ultimate application performance. As

an added feature, the references output

impedance is extraordinarily low over the

entire operating range of quiescent

currents. This enables an extremely wide

dynamic load range with little effect on

the overall reference accuracy.

The LM385 family is available in fixed

1.2V and 2.5V reference values. Process

and circuit design optimization provide

for high accuracy with initial tolerance

values of 1% for the LM385B-1.2, 2% for

the LM385-1.2, 1.5% for the LM385B-2.5,

and

3%

for

the

LM385-2.5.

Complementing their initial accuracy, the

bandgap reference is temperature

compensated to deliver 20ppm

performance over the 0° to 70°C

operating temperature range.

The LM385 family from Linfinity is a

pin-for-pin replacement for the LM385/

385B family of voltage references.

K E Y F E AT U R E S

s

GUARANTEED 1% INITIAL ACCURACY

(LM385B-1.2)

s

GUARANTEED 2.5% INITIAL ACCURACY

(LM385-1.2)

s

GUARANTEED 1.5% INITIAL ACCURACY

(LM385B-2.5)

s

GUARANTEED 3% INITIAL ACCURACY

(LM385-2.5)

p

GUARANTEED 20µA OPERATING CURRENT

p

LOW TEMPERATURE COEFFICIENT

p

OPERATING CURRENT OF 20µA TO 20mA

p

VERY LOW DYNAMIC IMPEDANCE . . . 1Ω

A P P L I C AT I O N S

s

p

PORTABLE METER REFERENCES

PORTABLE TEST INSTRUMENTS

BATTERY OPERATED SYSTEMS

CURRENT LOOP INSTRUMENTATION

PRODUCT HIGHLIGHT

1.2V R

E F E R E N C E

5V

M

ICROPOWER

R

EFERENCE

F

ROM

9V B

ATTERY

9V

38k

1.2V

LM385-1.2V

200k

2.5V

LM385-2.5V

PA C K A G E O R D E R I N F O R M AT I O N

T

A

(°C)

Reference

Voltage

1.2V

Initial

Tolerance

±30mV

±12mV

±75mV

±38mV

DM

Plastic SOIC

8-pin

LM385DM-1.2

LM385BDM-1.2

LM385DM-2.5

LM385BDM-2.5

LP

Plastic TO-92

3-pin

LM385LP-1.2

LM385BLP-1.2

LM385LP-2.5

LM385BLP-2.5

0 to 70

2.5V

Note: All surface-mount packages are available in Tape & Reel.

Append the letter "T" to part number. (i.e. LM385DM-2.5T)

F O R F U R T H E R I N F O R M AT I O N C A L L ( 7 1 4 ) 8 9 8 - 8 1 2 1

Rev. 1.2 7/96

11861 W

ESTERN

A

VENUE

, G

ARDEN

G

ROVE

, CA. 92841

1

PRODUCT DATABOOK 1996/1997

LM385/385B

1.2 & 2.5V M

I C R O P O W E R

V

O LTA G E

R

E F E R E N C E

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A B S O L U T E M A X I M U M R AT I N G S

(Note 1)

PACKAGE PIN OUTS

Reverse Breakdown Current .................................................................................... 30mA

Forward Current ........................................................................................................ 10mA

Operating Temperature Range

LM385 ........................................................................................................... 0°C to 70°C

Storage Temperature Range ...................................................................... -65°C to 150°C

Lead Temperature (soldering, 10 seconds) ............................................................. 300°C

Note 1. Values beyond which damage may occur. All voltages are specified with respect to

ground, and all currents are positive into the specified terminal

N/C

1.

N/C

2.

N/C

3 .

ANODE

4.

8.

7.

6.

5.

CATHODE

N/C

CATHODE

N/C

DM PACKAGE

(Top View)

T H ER MAL DATA

DM PACKAGE:

THERMAL RESISTANCE-JUNCTION TO AMBIENT,

θ

JA

LP PACKAGE:

THERMAL RESISTANCE-JUNCTION TO AMBIENT,

θ

JA

165ºC/W

1.

ANODE

2.

CATHODE

3.

N/C

LP PACKAGE

(Top View)

The

θ

JA

numbers are guidelines for the thermal performance of the device/pc-board system.

All of the above assume no ambient airflow.

2

Rev. 1.2 7/96

PRODUCT DATABOOK 1996/1997

LM385/385B

1.2 & 2.5V M

I C R O P O W E R

V

O LTA G E

R

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P

R O D U C T I O N

D

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H E E T

ELECTRICAL CHARACTERISTICS

(Unless otherwise specified, these specifications apply to T

A

= 25ºC. Typ number represents T

A

= 25ºC value.)

LM385/385B-1.2

Parameter

Reverse Breakdown Voltage

Average Temperature Coefficient

Minimum Operating Current

Reverse Breakdown Voltage Chang

with Current

Reverse Dynamic Impedance

Wide Band Noise (RMS)

Long Term Stability

LM385

LM385B

Symbol

V

Z

∆V

Z

∆Temp

I

MIN

e

∆I

R

r

z

e

n

∆V

Z

∆Time

I

MIN

≤

I

R

≤

I

MAX

I

MIN

≤

I

R

≤

I

MAX

I

R

= 100µA

Test Conditions

LM385/385B-1.2

Min. Typ.

Max.

1.205

1.223

1.235

20

8

1.260

1.247

Units

V

ppm/°C

µA

mV

Ω

µV

ppm/kHr

∆V

Z

I

MIN

≤

I

R

≤

1mA

≤

I

R

≤

20mA

I

R

= 100µA

I

R

= 100µA, 10Hz

≤

f

≤

10kHz

I

R

= 100µA, T

A

= 25°C ± 0.1°C

15

1.5

20

1

60

20

LM385/385B-2.5

Parameter

Reverse Breakdown Voltage

Average Temperature Coefficient

Minimum Operating Current

Reverse Breakdown Voltage Chang

with Current

Reverse Dynamic Impedance

Wide Band Noise (RMS)

Long Term Stability

LM385

LM385B

Symbol

V

Z

∆V

Z

∆Temp

I

MIN

e

∆I

R

r

z

e

n

∆V

Z

∆Time

I

MIN

≤

I

R

≤

I

MAX

I

MIN

≤

I

R

≤

I

MAX

I

R

= 100µA

Test Conditions

LM385/385B-2.5

Min. Typ.

Max.

2.425

2.462

2.500

20

13

2.575

2.538

Units

V

ppm/°C

µA

mV

Ω

µV

ppm/kHr

∆V

Z

I

MIN

≤

I

R

≤

1mA

≤

I

R

≤

20mA

I

R

= 100µA, f = 20Hz

I

R

= 100µA, 10Hz

≤

f

≤

10kHz

I

R

= 100µA, T

A

= 25°C ± 0.1°C

20

2

20

1

120

20

GRAPH / CURVE INDEX

Characteristic Curves

LM385/385B-1.2

FIGURE #

1.

2.

3.

4.

5.

6.

7.

RESPONSE TIME

REVERSE CHARACTERISTICS

FORWARD CHARACTERISTICS

TEMPERATURE DRIFT

REVERSE VOLTAGE CHANGE

REVERSE DYNAMIC IMPEDANCE

NOISE VOLTAGE

FIGURE #

8.

9.

Characteristic Curves

LM385/385B-2.5

RESPONSE TIME

REVERSE CHARACTERISTICS

10.

FORWARD CHARACTERISTICS

11.

TEMPERATURE DRIFT

12.

REVERSE DYNAMIC IMPEDANCE

13.

NOISE VOLTAGE

Rev. 1.2 7/96

3

PRODUCT DATABOOK 1996/1997

LM385/385B

1.2 & 2.5V M

I C R O P O W E R

V

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R

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C H A R A C T E R I S T I C C U R V E S — LM385/385B-1.2V

FIGURE 1.

— RESPONSE TIME

FIGURE 2.

— REVERSE CHARACTERISTICS

100

Output Voltage

1.5V

T

A

= 0 to 70°C

Reverse Current - (µA)

1.0V

0.5V

0

V

IN

36k

V

OUT

10

Input Voltage

1

5V

0

0.1

0

50

100

500

550

0

0.2

0.4

0.6

0.8

1.0

1.2

1.4

Time - (µs)

Reverse Voltage - (V)

FIGURE 3.

— FORWARD CHARACTERISTICS

1.2

FIGURE 4.

— TEMPERATURE DRIFT

1.242

T

A

= 25°C

I

R

= 100µA

1.24

0.8

Reference Voltage - (V)

0.1

1

10

100

Forward Voltage - (V)

1.238

1.236

1.234

1.232

1.23

1.228

0.4

0

0.01

1.226

0

10

20

30

40

50

60

70

Forward Current - (mA)

Temperature - (°C)

4

Rev. 1.2 7/96

PRODUCT DATABOOK 1996/1997

LM385/385B

1.2 & 2.5V M

I C R O P O W E R

V

O LTA G E

R

E F E R E N C E

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H E E T

C H A R A C T E R I S T I C C U R V E S — LM385/385B-1.2V

FIGURE 5.

— REVERSE VOLTAGE CHANGE

16

14

FIGURE 6.

— REVERSE DYNAMIC IMPEDANCE

1000

Output Voltage Change - (mV)

Dynamic Impedance - (Ω)

12

10

8

6

4

2

0

-2

-4

0.01

T

A

= 0 to 70°C

100

T

A

= 25°C

I

R

= 100µA

10

1

0.1

1

10

100

10

100

1k

10k

100k

Reverse Current - (mA)

(f) Frequency - (Hz)

FIGURE 7.

— NOISE VOLTAGE

800

700

(V

N

) Noise Voltage - (nV/ Hz)

600

500

400

300

200

100

I

R

= 100µA

T

A

= 25°C

100

1k

10k

100k

10

(f) Frequency - (Hz)

Rev. 1.2 7/96

5

LM385BDM-12

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