LT1009 Series
2.5V Reference
FEATURES
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DESCRIPTION
The LT
®
1009 is a precision trimmed 2.5V shunt regula-
tor diode featuring a maximum initial tolerance of only
±5mV. The low dynamic impedance and wide operating
current range enhances its versatility. The 0.2% reference
tolerance is achieved by on-chip trimming which not only
minimizes the initial voltage tolerance but also minimizes
the temperature drift.
Even though no adjustments are needed with the LT1009,
a third terminal allows the reference voltage to be adjusted
±5% to calibrate out system errors. In many applications,
the LT1009 can be used as a pin-to-pin replacement of the
LM136 and the external trim network eliminated.
For a lower drift 2.5V reference, see the LT1019 data
sheet.
L,
LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
Maximum Initial Tolerance: 0.2%
Guaranteed
Temperature Stability
Maximum 0.6Ω Dynamic Impedance
Wide Operating Current Range
Directly Interchangeable with LM136 for Improved
Performance
No Adjustments Needed for Minimum Temperature
Coefficient
Available in 8-Lead SO and MSOP Packages and
3-Lead TO-92 Package
APPLICATIONS
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Reference for 5V Systems
8-Bit A/D and D/A Reference
Digital Voltmeters
Current Loop Measurement and Control Systems
Power Supply Monitor
TYPICAL APPLICATION
2.5V Reference
5V TO 35V
3.6k
OUTPUT
LT1009
10k*
TRIM
REFERENCE VOLTAGE (V)
2.53
2.52
2.51
2.50
2.49
2.48
2.47
–50 –25
GUARANTEED
MINIMUM
GUARANTEED
MAXIMUM
TYPICAL
Output Voltage
*DOES NOT AFFECT
TEMPERATURE COEFFICIENT.
±5% TRIM RANGE
1009 TA01
50
25
75
0
TEMPERATURE (°C)
100
125
1009 TA02
1009ff
1
LT1009 Series
ABSOLUTE MAXIMUM RATINGS
(Note 1)
Reverse Current .....................................................20mA
Forward Current .....................................................10mA
Storage Temperature Range...................–65°C to 150°C
Lead Temperature (Soldering, 10 sec) .................. 300°C
Operating Temperature Range
LT1009/LT1009C ...................................... 0°C to 70°C
LT1009I .............................................. –40°C to 85°C
LT1009M
(OBSOLETE)
..................... –55°C to 125°C
PIN CONFIGURATION
BOTTOM VIEW
ADJ
+
–
NC
NC
NC
(–)
1
2
3
4
TOP VIEW
8
7
6
5
(+)
NC
(+)
ADJ
H PACKAGE
3-LEAD TO-46 METAL CAN
T
JMAX
= 150°C,
θ
JA
= 440°C/W,
θ
JC
= 80°C/W
MS8 PACKAGE
8-LEAD PLASTIC MSOP
T
JMAX
= 150°C,
θ
JA
= 250°C/W
Consider the MS8, S8 or Z Packages for Alternate Source
TOP VIEW
BOTTOM VIEW
NC 1
NC 2
NC 3
(–) 4
8
7
6
5
(+)
NC
(+)
ADJ
Z PACKAGE
3-LEAD PLASTIC TO-92
T
JMAX
= 100°C,
θ
JA
= 160°C/W
ADJ
OBSOLETE PACKAGE
+
–
S8 PACKAGE
8-LEAD PLASTIC SO
T
JMAX
= 150°C,
θ
JA
= 190°C/W
ORDER INFORMATION
LEAD FREE FINISH
LT1009MH#PBF
LT1009CH#PBF
LT1009CMS8#PBF
LT1009S8#PBF
LT1009IS8#PBF
LT1009CZ#PBF
LT1009IZ#PBF
TAPE AND REEL
LT1009MH#TRPBF
LT1009CH#TRPBF
LT1009CMS8#TRPBF
LT1009S8#TRPBF
LT1009IS8#TRPBF
LT1009CZ#TRPBF
LT1009IZ#TRPBF
LTQZ
1009
1009I
PART MARKING
PACKAGE DESCRIPTION
3-Lead TO-46 Metal Can
3-Lead TO-46 Metal Can
8-Lead Plastic MSOP
8-Lead Plastic SO
8-Lead Plastic SO
3-Lead Plastic TO-92
3-Lead Plastic TO-92
TEMPERATURE RANGE
–55°C to 125°C
0°C to 70°C
0°C to 70°C
0°C to 70°C
–40°C to 85°C
0°C to 70°C
–40°C to 85°C
1009ff
2
LT1009 Series
ORDER INFORMATION
LEAD BASED FINISH
LT1009MH
LT1009CH
LT1009CMS8
LT1009S8
LT1009IS8
LT1009CZ
LT1009IZ
TAPE AND REEL
LT1009MH#TR
LT1009CH#TR
LT1009CMS8#TR
LT1009S8#TR
LT1009IS8#TR
LT1009CZ#TR
LT1009IZ#TR
LTQZ
1009
1009I
PART MARKING
PACKAGE DESCRIPTION
3-Lead TO-46 Metal Can
3-Lead TO-46 Metal Can
8-Lead Plastic MSOP
8-Lead Plastic SO
8-Lead Plastic SO
3-Lead Plastic TO-92
3-Lead Plastic TO-92
TEMPERATURE RANGE
–55°C to 125°C
0°C to 70°C
0°C to 70°C
0°C to 70°C
–40°C to 85°C
0°C to 70°C
–40°C to 85°C
Consult LTC Marketing for parts specified with wider operating temperature ranges.
For more information on lead free part marking, go to:
http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to:
http://www.linear.com/tapeandreel/
AVAILABLE OPTIONS
TEMPERATURE
0°C to 70°C
–40°C to 85°C
–55°C to 125°C
ACCURACY
(%)
0.20
0.40
0.20
0.40
0.20
TEMPERATURE
COEFFICIENT
(ppm/°C)
25
25
35
35
35
TO-46 (H)
OBSOLETE
LT1009CH
PACKAGE STYLE
MSOP-8
SO-8
(MS8)
(S8)
LT1009CMS8
LT1009S8
LT1009IZ
LT1009IS8
LT1009MH
TO-92
(Z)
LT1009CZ
ELECTRICAL CHARACTERISTICS
SYMBOL PARAMETER
V
Z
ΔV
Z
ΔI
R
r
Z
Reverse Breakdown
Voltage
Reverse Breakdown
Change with Current
Reverse Dynamic
Impedance
Temperature Stability
ΔV
Z
ΔTemp
ΔV
Z
ΔTime
CONDITIONS
The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C.
LT100M
MIN TYP MAX
LT1009I
MIN TYP MAX
LT1009/LT1009C
MIN TYP MAX
UNITS
V
V
mV
mV
Ω
Ω
mV
ppm/°C
ppm/°C
ppm/°C
ppm/kHr
T
A
= 25°C, I
R
= 1mA H, Z Pkg
MS, S Pkg
400μA ≤ I
R
≤ 10mA
I
R
= 1mA
T
MIN
≤ T
A
≤ T
MAX
l
l
l
2.495 2.500 2.505 2.495 2.500 2.505 2.495 2.500 2.505
2.49 2.50 2.51 2.49 2.50 2.51
2.6
3.0
0.2
0.4
15
25
20
6
10
0.6
1.0
15
25
35
20
20
15
2.6
3.0
0.2
0.4
10
12
1.0
1.4
15
25
35
2.6
3.0
0.2
0.4
1.8
15
10
12
1.0
1.4
4
25
Average Temperature
0°C ≤ T
A
≤ 70°C
Coefficient (Notes 2, 3) –40°C ≤ T
A
≤ 85°C
–55°C ≤ T
A
≤ 125°C
Long-Term Stability
T
A
= 25°C ±0.1°C, I
R
= 1mA
Note 1:
Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2:
Guaranteed by Design.
Note 3:
Average temperature coefficient is defined as the total voltage
change divided by the specified temperature change.
1009ff
3
LT1009 Series
TYPICAL PERFORMANCE CHARACTERISTICS
Reverse Characteristics
10
–1
Forward Characteristics
1.2
1.0
FORWARD VOLTAGE (V)
T
J
= 25°C
REVERSE VOLTAGE CHANGE (mV)
5
Reverse Voltage Change
REVERSE CURRENT (A)
10
–2
4
0.8
0.6
0.4
0.2
3
10
–3
T
J
= 25°C
10
–4
T
J
= 125°C
T
J
= –55°C
10
–5
0.5
1.0
1.8
2.2
1.4
REVERSE VOLTAGE (V)
2.6
1009 G01
2
1
0
0.001
0
0.01
0.1
1
10
1009 G02
1009 G03
0
4
FORWARD CURRENT (mA)
12
16
8
REVERSE CURRENT (mA)
20
Dynamic Impedance
100
I
R
= 1mA
–55°C ≤ T
J
≤ 125°C
DYNAMIC IMPEDANCE (Ω)
250
Output Noise Voltage
I
R
= 1mA
T
J
= 25°C
VOLTAGE SWING (V)
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
Response Time
OUTPUT
200
NOISE (nV/√Hz)
10
5k
INPUT
OUTPUT
150
1
100
10
4
INPUT
0
1
TIME (μs)
20
1009 G06
0.1
10
100
1k
10k
FREQUENCY (Hz)
100k
1009 G04
50
0
10
100
1k
FREQUENCY (Hz)
1009 G05
10k
100k
1009ff
4
LT1009 Series
SCHEMATIC DIAGRAM
+
Q7
Q11
24k
Q8
Q7
20pF
10k
30pF
Q10
24k
6.6k
500Ω
Q2
Q1
Q4
Q6
Q12
Q9
30k
6.6k
ADJ
Q3
Q5
720Ω
Q13
–
1009 SD
TYPICAL APPLICATIONS
Wide Supply Range, Adjustable Reference
3.6V TO 40V
V
+
Low Temperature Coefficient Power Regulator
LT317A
OUT
ADJ
V
IN
LM334
R
IN
V
OUT
1.2k
375Ω
V
–
62Ω
LT1009
LT1009
10k
1009 TA03
2k
1009 TA04
Switchable ±1.25V Bipolar Reference
5V
5k
5V
–5V
5k
LT1009
10k
1%
OUT
9.76k
1%
500Ω
1009 TA05
5k
–5V
1009ff
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