LT1009 Series
2.5V Reference
FEATURES
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DESCRIPTIO
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
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.
All other trademarks are the property of their respective owners.
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
5V TO 35V
3.6k
REFERENCE VOLTAGE (V)
2.53
2.52
OUTPUT
2.51
2.50
2.49
2.48
1009 TA01
LT1009
10k*
TRIM
*DOES NOT AFFECT
TEMPERATURE COEFFICIENT.
±5%
TRIM RANGE
2.47
–50 –25
U
Output Voltage
GUARANTEED
MAXIMUM
TYPICAL
GUARANTEED
MINIMUM
50
25
75
0
TEMPERATURE (°C)
100
125
1009 TA02
U
U
1009fd
1
LT1009 Series
ABSOLUTE
AXI U
RATI GS
Reverse Current .................................................... 20mA
Forward Current ................................................... 10mA
Storage Temperature Range ................. – 65°C to 150°C
Lead Temperature (Soldering, 10 sec).................. 300°C
PACKAGE/ORDER I FOR ATIO
BOTTOM VIEW
ADJ
+
–
ORDER PART
NUMBER
TOP VIEW
LT1009MH
LT1009CH
H PACKAGE
3-LEAD TO-46 METAL CAN
T
JMAX
= 150°C,
θ
JA
= 440°C/ W,
θ
JC
= 80°C/ W
OBSOLETE PACKAGE
Consider the MS8, S8 or Z Packages for Alternate Source
TOP VIEW
NC 1
NC 2
NC 3
(–) 4
8
7
6
5
(+)
NC
(+)
ADJ
ORDER PART
NUMBER
LT1009S8
LT1009IS8
S8 PART MARKING
1009
1009I
S8 PACKAGE
8-LEAD PLASTIC SO
T
JMAX
= 150°C,
θ
JA
= 190°C/ W
Consult LTC Marketing for parts specified with wider operating temperature ranges.
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
35
35
35
LT1009MH
TO-46 (H)
OBSOLETE
LT1009CH
LT1009CMS8
LT1009S8
LT1009IZ
LT10098IS8
PACKAGE STYLE
MSOP-8
SO-8
(MS8)
(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
(OBSOLETE)
................... –55°C to 125°C
ORDER PART
NUMBER
8
7
6
5
(+)
NC
(+)
ADJ
NC
NC
NC
(–)
1
2
3
4
LT1009CMS8
MS8 PART MARKING
LTQZ
MS8 PACKAGE
8-LEAD PLASTIC MSOP
T
JMAX
= 150°C,
θ
JA
= 250°C/ W
BOTTOM VIEW
ADJ
+
–
ORDER PART
NUMBER
LT1009CZ
LT1009IZ
Z PACKAGE
3-LEAD PLASTIC TO-92
T
JMAX
= 100°C,
θ
JA
= 160°C/ W
1009fd
LT1009 Series
ELECTRICAL CHARACTERISTICS
The
●
denotes the specifications which apply over the full operating temperature range, otherwise specifications are at T
A
= 25°C.
SYMBOL PARAMETER
V
Z
∆V
Z
∆I
R
r
Z
Reverse Breakdown
Voltage
Reverse Breakdown
Change with Current
Reverse Dynamic
Impedance
Temperature Stability
∆V
Z
∆Temp
∆V
Z
∆Time
CONDITIONS
T
A
= 25°C, I
R
= 1mA H, Z Pkg
MS, S Pkg
400µA
≤
I
R
≤
10mA
●
LT1009M
MIN TYP MAX
2.485 2.500 2.505
2.6
3.0
0.2
0.4
15
25
20
6
10
0.6
1.0
15
25
35
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
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
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
I
R
= 1mA
●
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 PERFOR A CE CHARACTERISTICS
Reverse Characteristics
10
–1
1.0
FORWARD VOLTAGE (V)
REVERSE CURRENT (A)
REVERSE VOLTAGE CHANGE (mV)
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
1.2
T
J
= 25°C
4
5
Reverse Voltage Change
0.8
0.6
0.4
0.2
0
0.001
3
2
1
0
0.01
0.1
1
10
1009 G02
0
4
FORWARD CURRENT (mA)
12
16
8
REVERSE CURRENT (mA)
20
1009 G03
1009fd
3
LT1009 Series
TYPICAL PERFOR A CE 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 (nV/√Hz)
10
1
0.1
10
100
1k
10k
FREQUENCY (Hz)
SCHE ATIC DIAGRA
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
+
Q7
Q11
24k
Q8
Q7
20pF
10k
30pF
Q10
24k
6.6k
500Ω
Q9
30k
6.6k
Q12
ADJ
Q5
720Ω
Q13
–
1009 SD
1009fd
LT1009 Series
TYPICAL APPLICATIO S
U
Wide Supply Range, Adjustable Reference
3.6V TO 40V
V
+
LM334
V
–
R
62Ω
Low Temperature Coefficient Power Regulator
V
IN
IN
LT317A
OUT
ADJ
V
OUT
1.2k
375Ω
LT1009
10k
1009 TA03
LT1009
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
1009fd
5
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