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

LM285-2.5, LM385-2.5, LM385B-2.5

MICROPOWER VOLTAGE REFERENCES

SLVS023E ± JANUARY 1989 ± REVISED JULY 1999

D Operating Current Range . . . 20 µA to				D PACKAGE
	20 mA			(TOP VIEW)
D 1.5% and 3% Initial Voltage Tolerance		NC						CATHODE
				1	8
	Reference Impedance
D		NC		2	7			NC
	± LM385 . . . 1 Ω Max at 25°C	NC		3	6			NC
	± All Devices . . . 1.5 Ω Max Over Full	ANODE		4	5			NC
	Temperature Range
D Very Low Power Consumption			LP PACKAGE
	Applications:
D				(TOP VIEW)
	± Portable Meter References
	± Portable Test Instruments				ANODE
	± Battery-Operated Systems				CATHODE
	± Current-Loop Instrumentation
	± Panel Meters				NC

DDesigned to be Interchangeable With

National LM285-2.5 and LM385-2.5

NC±No internal connection

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

		VZ	PACKAGED DEVICES		CHIP FORM
	TA
			SMALL OUTLINE	PLASTIC
		TOLERANCE			(Y)
			(D)	(LP)
	0°C to 70°C	3%	LM385D-2.5	LM385LP-2.5
					LM385Y-2.5
		1.5%	LM385BD-2.5	LM385BLP-2.5
	±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 ª-2-5º).

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.

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.

Copyright 1999, Texas Instruments Incorporated

POST OFFICE BOX 655303 •DALLAS, TEXAS 75265

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LM285-2.5, LM385-2.5, LM385B-2.5

MICROPOWER VOLTAGE REFERENCES

SLVS023E ± JANUARY 1989 ± REVISED JULY 1999

logic symbol

ANODE CATHODE

schematic

7.5 kΩ

600 kΩ

Q13

CATHODE

Q12

Q4

Q7

200 kΩ

Q11

Q3

Q10

50 kΩ

Q1

300 kΩ

500 Ω

20 pF

20 pF

Q9

Q2

Q5

Q6

Q8

Q14

500 Ω

100 kΩ

500 Ω

60 kΩ

ANODE

NOTE A: All component values shown are nominal.

absolute maximum ratings over operating free-air temperature range²

Reverse current, IR . . .

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. . . . . . . . . . . 30 mA

Forward current, IF . . . .

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. . . . . . . . . . . 10 mA

Package thermal impedance, θJA (see Notes 1 and 2): D package .

. . . . . . .

.

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. . . . . . . . . . 97°C/W

LP package

. . . . . . .

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. . . . . . . . . 156°C/W

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

. . . . . . .

.

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. . . . . . . . . . . 260°C

Storage temperature range, Tstg . .

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. . . ±65°C to 150°C

²Stresses beyond those listed under ªabsolute maximum ratingsº 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 ªrecommended operating conditionsº is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.

NOTES: 1. Maximumpower dissipation is a function of TJ(max),θJA,and TA. The maximum allowable power dissipation at any allowable ambient temperature is PD = (TJ(max) ± TA)/θJA. Operation at the absolute maximum TJ of 150°C can impact reliability.

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

		MIN	MAX	UNIT
Reference current, IZ		0.02	20	mA
Operating free-air temperature range, TA	LM285-2.5	±40	85	°C
	LM385-2.5, LM385B-2.5	0	70

2	POST OFFICE BOX 655303 •DALLAS, TEXAS 75265

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

PARAMETER

TEST

T ²

LM285-2.5

LM385-2.5

LM385B-2.5

UNIT

CONDITIONS

MIN

TYP

MAX

MIN

TYP

MAX

MIN

TYP

MAX

A

VZ

Reference

IZ = 20 µA

25°C

2.462

2.5

2.538

2.425

2.5

2.575

2.462

2.5

2.538

V

voltage

to 20 mA

Average

temperature

IZ = 20 µA

αVZ

coefficient of

25°C

±20

±20

±20

ppm/°C

to 20 mA

reference

voltage³

25°C

1

2

2

Change in

IZ = 20

A

VZ

reference

to 1 mA

Full range

1.5

2

2

mV

voltage with

25°C

10

20

20

current

IZ = 1

A

to 20 mA

Full range

30

30

30

Long-term

VZ/ t

change in

IZ = 100 µA

25°C

±20

±20

±20

ppm/khr

reference

voltage

Minimum

IZ(min)

reference

Full range

8

20

8

20

8

20

µA

current

zz

Reference

IZ = 100 µA

25°C

0.2

0.6

0.4

1

0.4

1

Ω

impedance

Full range

1.5

1.5

1.5

Broadband

IZ = 100 µA,

25°C

µV

Vn

f = 10 Hz

120

120

120

noise voltage

to 10 kHz

² 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.

³The average temperature coefficient of reference voltage is defined as the total change in reference voltage divided by the specified temperature range.

electrical characteristics at TA = 25°C

	PARAMETER	TEST CONDITIONS		LM385Y-2.5			UNIT
				MIN	TYP	MAX
VZ	Reference voltage	IZ = 20 µA to 20 mA		2.462	2.5	2.575	V
α	Average temperature coefficient of reference voltage³	I = 20 µA to 20 mA			±20		ppm/°C
VZ		Z
VZ/ t	Long-term change in reference voltage	IZ = 100	µA		±20		ppm/khr
zz	Reference impedance	IZ = 100	µA		0.4	1	Ω
Vn	Broadband noise voltage	IZ = 100	µA,		120		µV
		f = 10 Hz to 10 kHz

³The average temperature coefficient of reference voltage is defined as the total change in reference voltage divided by the specified temperature range.

POST OFFICE BOX 655303 •DALLAS, TEXAS 75265

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