Texas Instruments LM385BDR-2-5, LM385BD-2-5, LM385BLP-2-5, LM385D-2-5, LM385LPR-2-5 Datasheet

V

CHIP FORM

0°C to 70°C

LM285-2.5, LM385-2.5, LM385B-2.5

MICROPOWER VOLTAGE REFERENCES

SLVS023E – JANUARY 1989 – REVISED JULY 1999

NC
NC
NC

D PACKAGE

(TOP VIEW)

1
2
3
4

8
7
6
5

CATHODE
NC
NC
NC

D

Operating Current Range ...20 µA to
20 mA

D

1.5% and 3% Initial Voltage Tolerance

D

Reference Impedance
– LM385...1 Ω Max at 25°C
– All Devices . . . 1.5 Ω Max Over Full

ANODE

T emperature Range

D

Very Low Power Consumption

D

Applications:

LP PACKAGE

(TOP VIEW)

– Portable Meter References
– Portable Test Instruments
– Battery-Operated Systems
– Current-Loop Instrumentation
– Panel Meters

D

Designed to be Interchangeable With
National LM285-2.5 and LM385-2.5

NC–No internal connection

ANODE
CATHODE

NC

description

These micropower two-terminal band-gap voltage references operate over a 20-µA to 20-mA current range and
feature exceptionally low dynamic impedance and good temperature stability . On-chip trimming provides tight
voltage tolerance. The band-gap reference for these devices has low noise and long-term stability.

The design makes these devices exceptionally tolerant of capacitive loading and thus, easier to use in most
reference applications. The wide dynamic operating temperature range accommodates varying current
supplies with excellent regulation.

The extremely low power drain of this series makes them useful for micropower circuitry. These voltage
references can make portable meters, regulators, or general-purpose analog circuitry with battery life
approaching shelf life. The wide operating current range allows them to replace older references with
tighter-tolerance parts.

The LM285-2.5 is characterized for operation from –40°C to 85°C. The LM385-2.5 and LM385B-2.5 are
characterized for operation from 0°C to 70°C.

AVAILABLE OPTIONS

T

A

°

°

–40°C to 85°C 1.5% LM285D-2.5 LM285LP-2.5

The D package is available taped and reeled. Add the suffix R to the device type (e.g., LM385DR-2-5). Chip
forms are tested at 25°C.
For ordering purposes, the decimal point in the part number must be replaced with a hyphen (i.e., show
the -2.5 suffix as “-2-5”).

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

Z

TOLERANCE

3% LM385D-2.5 LM385LP-2.5

1.5% LM385BD-2.5 LM385BLP-2.5

PACKAGED DEVICES

SMALL OUTLINE

(D)

PLASTIC

(LP)

(Y)

LM385Y-2.5

PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

Copyright  1999, Texas Instruments Incorporated

1

LM285-2.5, LM385-2.5, LM385B-2.5

Operating free-air temperature range, T

°C

MICROPOWER VOLTAGE REFERENCES

SLVS023E – JANUARY 1989 – REVISED JULY 1999

logic symbol

ANODE CATHODE

schematic

CATHODE

Q13

200 kΩ

50 kΩ

Q10

300 kΩ

Q9

7.5 kΩ

Q4 Q7

Q3

Q1

20 pF 20 pF

Q2

100 kΩ

NOTE A: All component values shown are nominal.

Q5

500 Ω 60 kΩ

600 kΩ

Q12

Q11

Q6 Q8

absolute maximum ratings over operating free-air temperature range

500 Ω

Q14

500 Ω

ANODE

†

Reverse current, IR 30 mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Forward current, IF 10 mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Package thermal impedance, θ

Lead temperature 1,6 mm (1/16 inch) from case for 10 seconds 260°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Storage temperature range, T

†

Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device. These are stress ratings only, and
functional operation of the device at these or any other conditions beyond those indicated under “recommended operating conditions” is not
implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.

NOTES: 1. Maximum power dissipation is a function of T

temperature is PD = (T

2. The package thermal impedance is calculated in accordance with JESD 51, except for through-hole packages which use a trace
length of zero.

recommended operating conditions

Reference current, I

p

2

Z

p

J(max)

A

(see Notes 1 and 2): D package 97°C/W. . . . . . . . . . . . . . . . . . . . . . . . . . .

JA

LP package 156°C/W. . . . . . . . . . . . . . . . . . . . . . . . .

–65°C to 150°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

stg

,

θ

– TA)/

J(max)

θ

. Operation at the absolute maximum TJ of 150°C can impact reliability.

JA

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

, and TA. The maximum allowable power dissipation at any allowable ambient

JA

MIN MAX UNIT

0.02 20 mA
LM285-2.5 –40 85
LM385-2.5, LM385B-2.5 0 70

°

PARAMETER

T

†

UNIT

Change in

Z

µ

∆V

mV

Z

µ

I

100 µA

Ω

PARAMETER

TEST CONDITIONS

UNIT

LM285-2.5, LM385-2.5, LM385B-2.5

MICROPOWER VOLTAGE REFERENCES

SLVS023E – JANUARY 1989 – REVISED JULY 1999

electrical characteristics at specified free-air temperature

TEST

CONDITIONS

Z

Reference
voltage

Average
temperature
coefficient of
reference

‡

voltage

reference
voltage with
current

Long-term
change in
reference
voltage

Minimum
reference
current

Reference
impedance

Broadband
noise voltage

V

Z

α

VZ

∆VZ/∆t

I

Z(min)

z

z

V

n

†

Full range is 0°C to 70°C for the LM385-2.5 and LM385B-2.5, and –40°C to 85°C for the LM285-2.5.

‡

The average temperature coefficient of reference voltage is defined as the total change in reference voltage divided by the specified temperature
range.

IZ = 20 µA
to 20 mA

IZ = 20 µA
to 20 mA

I

= 20 µA

to 1 mA
I

= 1 µA

to 20 mA

IZ = 100 µA 25°C ±20 ±20 ±20 ppm/khr

=

Z

IZ = 100 µA,
f = 10 Hz
to 10 kHz

A

25°C 2.462 2.5 2.538 2.425 2.5 2.575 2.462 2.5 2.538 V

25°C ±20 ±20 ±20 ppm/°C

25°C 1 2 2

Full range 1.5 2 2

25°C 10 20 20

Full range 30 30 30

Full range 8 20 8 20 8 20 µA

25°C 0.2 0.6 0.4 1 0.4 1

Full range 1.5 1.5 1.5

25°C 120 120 120 µV

LM285-2.5 LM385-2.5 LM385B-2.5

MIN TYP MAX MIN TYP MAX MIN TYP MAX

electrical characteristics at TA = 25°C

LM385Y-2.5

MIN TYP MAX

V

Z

α

VZ

∆VZ/∆t Long-term change in reference voltage IZ = 100 µA ±20 ppm/khr
z

z

V

n

‡

The average temperature coefficient of reference voltage is defined as the total change in reference voltage divided by the specified temperature
range.

Reference voltage IZ = 20 µA to 20 mA 2.462 2.5 2.575 V
Average temperature coefficient of reference voltage

Reference impedance IZ = 100 µA 0.4 1 Ω
Broadband noise voltage

‡

IZ = 20 µA to 20 mA ±20 ppm/°C

IZ = 100 µA,
f = 10 Hz to 10 kHz

120 µV

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

3