LT1009 Series
2.5V Reference
FEATURES
s
s
s
s
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DESCRIPTIO
s
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
The LT
®
1009 is a precision trimmed 2.5V shunt regulator
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 toler-
ance 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.
, LTC and LT are registered trademarks of Linear Technology Corporation.
APPLICATIO S
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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
2.53
5V TO 35V
2.52
REFERENCE VOLTAGE (V)
3.6k
OUTPUT
LT1009
10k*
TRIM
2.51
2.50
2.49
2.48
*DOES NOT AFFECT
TEMPERATURE COEFFICIENT.
±5%
TRIM RANGE
1009 TA01
2.47
–50 –25
U
Output Voltage
GUARANTEED
MAXIMUM
TYPICAL
GUARANTEED
MINIMUM
50
25
75
0
TEMPERATURE (°C)
100
125
1009 TA02
U
U
1
LT1009 Series
ABSOLUTE
MAXIMUM
RATINGS
Reverse Current .................................................... 20mA
Forward Current ................................................... 10mA
Storage Temperature Range ................. – 65°C to 150°C
Lead Temperature (Soldering, 10 sec).................. 300°C
PACKAGE/ORDER INFORMATION
BOTTOM VIEW
TOP VIEW
NC 1
8
7
6
5
ADJ
Z PACKAGE
3-LEAD PLASTIC TO-92
BOTTOM VIEW
ADJ
3
ADJ
+
–
NC 2
NC 3
4
H PACKAGE
3-LEAD TO-46 METAL CAN
T
JMAX
= 150°C,
θ
JA
= 440°C/ W,
θ
JC
= 80°C/ W
S8 PACKAGE
8-LEAD PLASTIC SO
T
JMAX
= 150°C,
θ
JA
= 190°C/ W
ORDER PART NUMBER
LT1009MH
LT1009CH
ORDER PART NUMBER
LT1009S8
LT1009IS8
S8 PART MARKING
1009
1009I
AVAILABLE OPTIO S
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
25
35
35
LT1009MH
TO-46
(H)
LT1009CH
LT1009S8
LT1009IZ
LT1009IS8
PACKAGE STYLE
SO-8
(S8)
TO-92
(Z)
LT1009CZ
2
U
U
W
W W
U
U
W
(Note 1)
Operating Temperature Range
LT1009/LT1009C .................................. 0°C to 70°C
LT1009I ........................................... – 40°C to 85°C
LT1009M ........................................ –55°C to 125°C
+
2
–
1
NC
T
JMAX
= 100°C,
θ
JA
= 160°C/ W
ORDER PART NUMBER
LT1009CZ
LT1009IZ
LT1009 Series
ELECTRICAL CHARACTERISTICS
The
q
denotes specifications which apply over the full operating temperature range, otherwise specifications are TA = 25°C.
For MIL-STD components, please refer to LTC883C data sheet for test listing and parameters.
SYMBOL PARAMETER
Reverse Breakdown
V
Z
Voltage
∆V
Z
Reverse Breakdown
∆I
R
Change with Current
r
Z
Reverse Dynamic
Impedance
∆V
Z
∆Temp
∆V
Z
∆Time
CONDITIONS
T
A
= 25°C, I
R
= 1mA,
400µA
≤
I
R
≤
10mA
q
H, Z Pkg
S Pkg
LT1009M
MIN TYP MAX
2.495 2.500 2.505
2.6
3.0
0.2
0.4
15
25
20
6
10
0.6
1.0
15
25
35
I
R
= 1mA
q
q
LT1009I
LT1009/LT1009C
MIN TYP MAX MIN TYP MAX
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
10
2.6
10
3.0
12
3.0
12
0.2 1.0
0.2 1.0
0.4 1.4
0.4 1.4
15
15
25
35
1.8
15
4
25
UNITS
V
V
mV
mV
Ω
Ω
mV
ppm/°C
ppm/°C
ppm/°C
ppm/kHr
Temperature Stability T
MIN
≤
T
A
≤
T
MAX
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
20
20
Note 1:
Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2:
Guaranteed by Design.
Note 3:
Average temperature coefficient is defined as the total voltage
change divided by the specified temperature change.
TYPICAL PERFORMANCE CHARACTERISTICS
Reverse Characteristics
10
–1
1.2
T
J
= 25°C
1.0
REVERSE VOLTAGE CHANGE (mV)
0.01
0.1
1
10
1009 G02
FORWARD VOLTAGE (V)
REVERSE CURRENT (A)
10
–2
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
U W
Forward Characteristics
5
Reverse Voltage Change
4
0.8
0.6
0.4
0.2
0
0.001
3
2
1
0
0
4
FORWARD CURRENT (mA)
12
16
8
REVERSE CURRENT (mA)
20
1009 G03
3
LT1009 Series
TYPICAL PERFORMANCE CHARACTERISTICS
Dynamic Impedance
100
I
R
= 1mA
–55°C
≤
T
J
≤
125°C
250
I
R
= 1mA
T
J
= 25°C
DYNAMIC IMPEDANCE (Ω)
VOLTAGE SWING (V)
NOISE (mV/√Hz)
10
1
0.1
10
100
1k
10k
FREQUENCY (Hz)
SCHE ATIC DIAGRA
20pF
Q2
Q1
Q4
Q6
Q3
4
W
U W
1009 G04
Output Noise Voltage
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
Response Time
OUTPUT
200
5k
INPUT
OUTPUT
150
100
10
4
INPUT
0
1
TIME (µs)
20
1009 G06
100k
50
0
10
100
1k
FREQUENCY (Hz)
1009 G05
10k
100k
W
+
50k
Q9
Q17
24k
Q8
Q7
10k
30pF
Q16
24k
6.6k
500Ω
Q10
Q11
Q15
30k
6.6k
Q12
Q13
Q14
1.1k
ADJ
Q5
2k
Q18
–
1009 SD
LT1009 Series
TYPICAL APPLICATIONS
Wide Supply Range, Adjustable Reference
3.6V TO 40V
V
+
LM334
V
–
R
62Ω
LT1009
10k
1009 TA03
5V
–5V
U
Low Temperature Coefficient Power Regulator
V
IN
LT317A
IN
OUT
ADJ
V
OUT
1.2k
375Ω
LT1009
2k
1009 TA04
Switchable
±1.25V
Bipolar Reference
5V
5k
5k
LT1009
10k
1%
OUT
9.76k
1%
500Ω
1009 TA05
5k
–5V
5
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