LT1004-1.2, LT1004-2.5
MICROPOWER INTEGRATED VOLTAGE REFERENCES
SLVS022M − JANUARY 1989 − REVISED MAY 2008
D
Initial Accuracy
D
D
D
D
−
±4
mV for LT1004-1.2
−
±20
mV for LT1004-2.5
Micropower Operation
Operates up to 20 mA
Very Low Reference Impedance
Applications:
− Portable Meter Reference
− Portable Test Instruments
− Battery-Operated Systems
− Current-Loop Instrumentation
D OR PW PACKAGE
(TOP VIEW)
NC
NC
NC
ANODE
1
2
3
4
8
7
6
5
CATHODE
NC
CATHODE
NC
NC − No internal connection
Terminals 6 and 8 are internally connected.
LP PACKAGE
(TOP VIEW)
description/ordering information
The LT1004 micropower voltage reference is a
two-terminal band-gap reference diode designed
to provide high accuracy and excellent
temperature characteristics at very low operating
currents. Optimizing the key parameters in the
design, processing, and testing of the device
results in specifications previously attainable only
with selected units.
ANODE
CATHODE
NC
NC − No internal connection
The LT1004 is a pin-for-pin replacement for the LM285 and LM385 series of references, with improved
specifications. It is an excellent device for use in systems in which accuracy previously was attained at the
expense of power consumption and trimming.
The LT1004C is characterized for operation from 0°C to 70°C. The LT1004I is characterized for operation from
−40°C to 85°C.
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
2008, Texas Instruments Incorporated
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1
LT1004-1.2, LT1004-2.5
MICROPOWER INTEGRATED VOLTAGE REFERENCES
SLVS022M − JANUARY 1989 − REVISED MAY 2008
description/ordering information (continued)
ORDERING INFORMATION
{
T
A
V
Z
TYP
SOIC (D)
1.2
12V
TSSOP (PW)
0°C to 70°C
SOIC (D)
2.5
25V
TSSOP (PW)
SOIC (D)
1.2
12V
TSSOP (PW)
−40°C to 85°C
40°C
SOIC (D)
25V
2.5
TSSOP (PW)
†
PACKAGE
‡
Tube of 75
Reel of 2500
Tube of 150
Reel of 2000
Tube of 75
Reel of 2500
Tube of 150
Reel of 2000
Tube of 75
Reel of 2500
Tube of 150
Reel of 2000
Tube of 75
Reel of 2500
Tube of 150
Reel of 2000
ORDERABLE
PART NUMBER
LT1004CD-1-2
LT1004CDR-1-2
LT1004CPW-1-2
LT1004CPWR-1-2
LT1004CD-2-5
LT1004CDR-2-5
LT1004CPW-2-5
LT1004CPWR-2-5
LT1004ID-1-2
LT1004IDR-1-2
LT1004IPW-1-2
LT1004IPWR-1-2
LT1004ID-2-5
LT1004IDR-2-5
LT1004IPW-2-5
LT1004IPWR-2-5
TOP-SIDE
MARKING
4C-12
4C 12
4C-12
4C 12
4C-25
4C 25
4C-25
4C 25
4I 12
4I-12
4I-12
4I 12
4I-25
4I 25
4I-25
4I 25
For the most current package and ordering information, see the Package Option Addendum at the end of this document, or see
the TI web site at http://www.ti.com.
‡
Package drawings, thermal data, and symbolization are available at http://www.ti.com/packaging.
symbol
ANODE
(A)
CATHODE
(K)
2
POST OFFICE BOX 655303
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DALLAS, TEXAS 75265
LT1004-1.2, LT1004-2.5
MICROPOWER INTEGRATED VOLTAGE REFERENCES
SLVS022M − JANUARY 1989 − REVISED MAY 2008
schematic
LT1004-1.2
CATHODE
7.5 kΩ
Q3
Q4
Q2
Q10
Q1
20 pF
20 pF
600 kΩ
500 kΩ
Q5
Q9
300 kΩ
Q8
50 kΩ
Q11
Q12
200 kΩ
500
Ω
Q6
Q7
Q13
60 kΩ
ANODE
LT1004-2.5
CATHODE
7.5 kΩ
Q12
200 kΩ
Q3
Q4
Q2
Q11
Q10
Q1
20 pF
20 pF
600 kΩ
500 kΩ
Q5
Q9
50 kΩ
500 kΩ
300 kΩ
Q8
500
Ω
Q6
Q7
Q13
60 kΩ
500 kΩ
ANODE
NOTE A: All component values shown are nominal.
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3
LT1004-1.2, LT1004-2.5
MICROPOWER INTEGRATED VOLTAGE REFERENCES
SLVS022M − JANUARY 1989 − REVISED MAY 2008
absolute maximum ratings over operating free-air temperature range (unless otherwise noted)
†
Reverse current, I
R
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 mA
Forward current, I
F
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 mA
Package thermal impedance,
θ
JA
(see Notes 1 and 2): D package . . . . . . . . . . . . . . . . . . . . . . . . . . . . 97°C/W
PW package . . . . . . . . . . . . . . . . . . . . . . . . . 149°C/W
Operating virtual junction temperature, T
J
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 150°C
Lead temperature 1,6 mm (1/16 inch) from case for 10 seconds . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 260°C
Storage temperature range, T
stg
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . −65°C to 150°C
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
J
(max),
θ
JA
, and T
A
. The maximum allowable power dissipation at any allowable
ambient temperature is P
D
= (T
J
(max) − T
A
)/
θ
JA
. Operating at the absolute maximum T
J
of 150°C can affect reliability.
2. The package thermal impedance is calculated in accordance with JESD 51-7.
†
recommended operating conditions
MIN
T
A
Operating free air temperature
free-air
LT1004C
LT1004I
0
−40
MAX
70
85
UNIT
°C
electrical characteristics at specified free-air temperature
PARAMETER
TEST
CONDITIONS
T
A‡
25°C
V
Z
Reference voltage
Average
temperature coefficient
of reference voltage
§
Change in
reference voltage
with current
Long-term change
in reference voltage
Minimum
reference current
Reference impedance
Broadband
noise voltage
I
Z
= 100
µA
A
I
Z
= 100
µA,
f = 10 Hz to 10 kHz
I
Z
= 100
µA
I
Z
= 10
µA
I
Z
= 20
µA
I
Z
= I
Z
(min) to 1 mA
I
Z
= 1 mA to 20 mA
I
Z
= 100
µA
25°C
20
25°C
∆V
Z
Full range
25°C
Full range
25°C
Full range
25°C
Full range
25°C
60
20
8
0.2
10
0.6
1.5
120
1
1.5
10
20
20
12
0.2
20
0.6
1.5
1
1.5
10
20
ppm/khr
µA
Ω
µV
mV
Full
range
LT1004C
LT1004I
LT1004-1.2
MIN
1.231
1.225
1.225
20
ppm/°C
TYP
1.235
MAX
1.239
1.245
1.245
LT1004-2.5
MIN
2.48
2.47
2.47
TYP
2.5
MAX
2.52
2.53
2.53
V
UNIT
a
V
Z
∆V
Z
/∆t
I
Z
(min)
z
z
V
n
‡
§
Full range is 0°C to 70°C for the LT1004C and −40°C to 85°C for the LT1004I.
The average temperature coefficient of reference voltage is defined as the total change in reference voltage divided by the specified temperature
range.
4
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LT1004-1.2, LT1004-2.5
MICROPOWER INTEGRATED VOLTAGE REFERENCES
SLVS022M − JANUARY 1989 − REVISED MAY 2008
TYPICAL CHARACTERISTICS
Table of Graphs
GRAPH TITLE
LT1004x-1.2
Reverse current vs Reverse voltage
Reference-voltage change vs Reverse current
Forward voltage vs Forward current
Reference voltage vs Free-air temperature
Reference impedance vs Reference current
Noise voltage vs Frequency
Filtered output noise voltage vs Cutoff frequency
LT1004x-2.5
Transient response
Reverse current vs Reverse voltage
Forward voltage vs Forward current
Reference voltage vs Free-air temperature
Reference impedance vs Reference current
Noise voltage vs Frequency
Filtered output noise voltage vs Cutoff frequency
Transient response
8
9
10
11
12
13
14
15
1
2
3
4
5
6
7
FIGURE
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5
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