Microsemi Corporation LM385B-2.5LP, LM385B-2.5DM, LM385B-1.2LP, LM385B-1.2DM, LM385-2.5LP Datasheet

DESCRIPTION KEY FEATURES

■■

■■

■ GUARANTEED 1% INITIAL ACCURACY

(LM385B-1.2)

■■

■■

■ GUARANTEED 2.5% INITIAL ACCURACY

(LM385-1.2)

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■■

■ GUARANTEED 1.5% INITIAL ACCURACY

(LM385B-2.5)

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■■

■ 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

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.

PACKAGE ORDER INFORMATION

T

A

(°C)

1.2V

±30mV LM385DM-1.2 LM385LP-1.2

0 to 70

±12mV LM385BDM-1.2 LM385BLP-1.2

2.5V

±75mV LM385DM-2.5 LM385LP-2.5
±38mV LM385BDM-2.5 LM385BLP-2.5

Reference

Voltage

DM

Plastic TO-92
3-pin

LP

Plastic SOIC
8-pin

Initial

Tolerance

APPLICATIONS

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■ PORTABLE METER REFERENCES

p PORTABLE TEST INSTRUMENTS
p BATTERY OPERATED SYSTEMS
p CURRENT LOOP INSTRUMENTATION

PRODUCT HIGHLIGHT

MICROPOWER REFERENCE FROM

9V BATTERY

1.2V REFERENCE

1.2V

LM385-1.2

V

5V

38k

2.5V

LM385-2.5V

9V

200k

1.2 & 2.5V M

ICROPOWER VOLTAGE REFERENCE

P RODUCTION DATA SHEET

THE INFINITE POWER OF INNOVATION

Copyright © 1996
Rev. 1.2 7/96

FOR FURTHER INFORMATION CALL [phone]

11861 WESTERN AVENUE, GARDEN GROVE, CA. 92841

LM385/385B

LIN DOC #:

385

1

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

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

1.2 & 2.5V M

ICROPOWER VOLTAGE REFERENCE

LM385/385B

PRODUCT DATABOOK 1996/1997

Copyright © 1996

Rev. 1.2 7/96

2

P

RODUCTION DATA SHEET

ABSOLUTE MAXIMUM RATINGS (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

THERMAL DATA

DM PACKAGE:

THERMAL RESISTANCE-JUNCTION TO AMBIENT,

θθ

θθ

θ

JA

165ºC/W

LP PACKAGE:

THERMAL RESISTANCE-JUNCTION TO AMBIENT,

θθ

θθ

θ

JA

165ºC/W

The θ

JA

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

All of the above assume no ambient airflow.

1. ANODE

2. CATHODE

3. N/C

LP PACKAGE

(Top View)

8.

7.

6.

5.

1.

2.

3 .

4.

N/C
N/C
N/C

ANODE

CATHODE
N/C
CATHODE
N/C

DM PACKAGE

(Top View)

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

1.2 & 2.5V M

ICROPOWER VOLTAGE REFERENCE

LM385/385B

PRODUCT DATABOOK 1996/1997

3

Copyright © 1996
Rev. 1.2 7/96

P RODUCTION DATA SHEET

ELECTRICAL CHARACTERISTICS

(Unless otherwise specified, these specifications apply to TA = 25ºC. Typ number represents TA = 25ºC value.)

Parameter

Symbol

Test Conditions Units

LM385/385B-1.2

Min. Typ. Max.

1.205 1.235 1.260 V

1.223 1.235 1.247 V
20 ppm/°C

815µA

1.5 mV

20 mV

1 Ω

60 µV
20 ppm/kHr

Reverse Breakdown Voltage LM385 VZI

MIN

≤ IR ≤ I

MAX

LM385B I

MIN

≤ IR ≤ I

MAX

Average Temperature Coefficient ∆V

ZIR

= 100µA

∆Temp

Minimum Operating Current I

MIN

Reverse Breakdown Voltage Chang e ∆V

Z

I

MIN

≤ IR ≤ 1mA

with Current ∆I

R

1mA ≤ IR ≤ 20mA

Reverse Dynamic Impedance r

zIR

= 100µA

Wide Band Noise (RMS) enI

R

= 100µA, 10Hz ≤ f ≤ 10kHz

Long Term Stability ∆V

ZIR

= 100µA, TA = 25°C ± 0.1°C

∆Time

GRAPH / CURVE INDEX

Characteristic Curves

LM385/385B-1.2

FIGURE #

1. RESPONSE TIME

2. REVERSE CHARACTERISTICS

3. FORWARD CHARACTERISTICS

4. TEMPERATURE DRIFT

5. REVERSE VOLTAGE CHANGE

6. REVERSE DYNAMIC IMPEDANCE

7. NOISE VOLTAGE

Parameter

Symbol

Test Conditions Units

LM385/385B-2.5

Min. Typ. Max.

2.425 2.500 2.575 V

2.462 2.500 2.538 V

20 ppm/°C

13 20 µA

2mV

20 mV

1 Ω

120 µV

20 ppm/kHr

Reverse Breakdown Voltage LM385 VZI

MIN

≤ IR ≤ I

MAX

LM385B I

MIN

≤ IR ≤ I

MAX

Average Temperature Coefficient ∆V

ZIR

= 100µA

∆Temp

Minimum Operating Current I

MIN

Reverse Breakdown Voltage Chang e ∆V

Z

I

MIN

≤ IR ≤ 1mA

with Current ∆I

R

1mA ≤ IR ≤ 20mA

Reverse Dynamic Impedance rzIR = 100µA, f = 20Hz

Wide Band Noise (RMS) e

nIR

= 100µA, 10Hz ≤ f ≤ 10kHz

Long Term Stability ∆V

ZIR

= 100µA, TA = 25°C ± 0.1°C

∆Time

Characteristic Curves

LM385/385B-2.5

FIGURE #

8. RESPONSE TIME

9. REVERSE CHARACTERISTICS

10. FORWARD CHARACTERISTICS

11. TEMPERATURE DRIFT

12. REVERSE DYNAMIC IMPEDANCE

13. NOISE VOLTAGE

LM385/385B-1.2

LM385/385B-2.5