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LT1009 Series 2.5V Reference
FEATURES

DESCRIPTIO
Maximum Initial Tolerance: 0.2% Guaranteed Temperature Stability Maximum 0.6 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(R)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 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.
, LTC and LT are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners.
APPLICATIO S

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 ................. - 65C to 150C Lead Temperature (Soldering, 10 sec).................. 300C
PACKAGE/ORDER I FOR ATIO
BOTTOM VIEW ADJ
+ -
ORDER PART NUMBER
TOP VIEW
LT1009MH LT1009CH
H PACKAGE 3-LEAD TO-46 METAL CAN
TJMAX = 150C, JA = 440C/ W, JC = 80C/ 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
TJMAX = 150C, JA = 190C/ W
Consult LTC Marketing for parts specified with wider operating temperature ranges.
AVAILABLE OPTIO S
TEMPERATURE 0C to 70C - 40C to 85C - 55C to 125C 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
WW
U
U
W
(Note 1)
Operating Temperature Range LT1009/LT1009C .................................. 0C to 70C LT1009I ........................................... - 40C to 85C LT1009M (OBSOLETE) ................... -55C to 125C
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
TJMAX = 150C, JA = 250C/ W
BOTTOM VIEW ADJ
+
-
ORDER PART NUMBER LT1009CZ LT1009IZ
Z PACKAGE 3-LEAD PLASTIC TO-92
TJMAX = 100C, JA = 160C/ W
1009fd
LT1009 Series
ELECTRICAL CHARACTERISTICS
The denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25C.
SYMBOL PARAMETER VZ VZ IR rZ Reverse Breakdown Voltage Reverse Breakdown Change with Current Reverse Dynamic Impedance Temperature Stability VZ Temp VZ Time CONDITIONS TA = 25C, IR = 1mA H, Z Pkg MS, S Pkg 400A IR 10mA
MIN
LT1009M TYP MAX
MIN
LT1009I TYP MAX
LT1009/LT1009C MIN TYP MAX
UNITS V V mV mV mV ppm/C ppm/C ppm/C ppm/kHr
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
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
IR = 1mA
TMIN TA TMAX
Average Temperature 0C TA 70C Coefficient (Notes 2, 3) -40C TA 85C -55C TA 125C Long-Term Stability TA = 25C 0.1C, IR = 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 TJ = 25C 10 -4 TJ = 125C TJ = -55C 10 -5 0.5 1.0 1.8 2.2 1.4 REVERSE VOLTAGE (V) 2.6
1009 G01
UW
Forward Characteristics
1.2 TJ = 25C
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 IR = 1mA -55C TJ 125C 250 IR = 1mA TJ = 25C
DYNAMIC IMPEDANCE ()
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
UW
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 (s) 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
500 Q9 30k 6.6k Q12 ADJ
Q5
720
Q13
-
1009 SD
1009fd
LT1009 Series
TYPICAL APPLICATIO S U
Wide Supply Range, Adjustable Reference
3.6V TO 40V V+ LM334 V- R 62
Low Temperature Coefficient Power Regulator
VIN
IN
LT317A OUT ADJ
VOUT 1.2k 375
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% 500
1009 TA05
5k -5V
1009fd
5
LT1009 Series
PACKAGE DESCRIPTIO U
H Package 2-Lead and 3-Lead TO-46 Metal Can
(LTC DWG # 05-08-1340)
0.209 - 0.219 (5.309 - 5.537) 0.178 - 0.195 (4.521 - 4.953) 0.500 (12.700) MIN * 0.085 - 0.105 (2.159 - 2.667) 0.050 (1.270) TYP 0.100 (2.540) TYP PIN 1 FOR 3-LEAD PACKAGE ONLY 0.025 (0.635) MAX 45 0.036 - 0.046 (0.914 - 1.168) 0.028 - 0.048 (0.711 - 1.219)
H02/03(TO-46) 1098
0.050 (1.270) TYP
REFERENCE PLANE
0.016 - 0.021** (0.406 - 0.533) DIA
*LEAD DIAMETER IS UNCONTROLLED BETWEEN THE REFERENCE PLANE AND 0.045" BELOW THE REFERENCE PLANE 0.016 - 0.024 **FOR SOLDER DIP LEAD FINISH, LEAD DIAMETER IS (0.406 - 0.610)
OBSOLETE PACKAGE
MS8 Package 8-Lead Plastic MSOP
(Reference LTC DWG # 05-08-1660)
0.889 0.127 (.035 .005)
5.23 (.206) MIN
3.20 - 3.45 (.126 - .136)
0.42 0.038 (.0165 .0015) TYP
0.65 (.0256) BSC
3.00 0.102 (.118 .004) (NOTE 3)
8
7 65
0.52 (.0205) REF
RECOMMENDED SOLDER PAD LAYOUT DETAIL "A" 0 - 6 TYP
4.90 0.152 (.193 .006)
0.254 (.010) GAUGE PLANE
3.00 0.102 (.118 .004) (NOTE 4)
0.53 0.152 (.021 .006) DETAIL "A" 0.18 (.007) SEATING PLANE
1
23
4
1.10 (.043) MAX
0.86 (.034) REF
0.22 - 0.38 (.009 - .015) TYP
NOTE: 1. DIMENSIONS IN MILLIMETER/(INCH) 2. DRAWING NOT TO SCALE 3. DIMENSION DOES NOT INCLUDE MOLD FLASH, PROTRUSIONS OR GATE BURRS. MOLD FLASH, PROTRUSIONS OR GATE BURRS SHALL NOT EXCEED 0.152mm (.006") PER SIDE 4. DIMENSION DOES NOT INCLUDE INTERLEAD FLASH OR PROTRUSIONS. INTERLEAD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.152mm (.006") PER SIDE 5. LEAD COPLANARITY (BOTTOM OF LEADS AFTER FORMING) SHALL BE 0.102mm (.004") MAX
0.65 (.0256) BSC
0.127 0.076 (.005 .003)
MSOP (MS8) 0204
1009fd
6
LT1009 Series
PACKAGE DESCRIPTIO U
S8 Package 8-Lead Plastic Small Outline (Narrow .150 Inch)
(Reference LTC DWG # 05-08-1610)
.045 .005 .050 BSC
8 .189 - .197 (4.801 - 5.004) NOTE 3 7 6 5 .160 .005 .228 - .244 (5.791 - 6.197) .150 - .157 (3.810 - 3.988) NOTE 3 1 2 3 4 .053 - .069 (1.346 - 1.752) 0- 8 TYP .004 - .010 (0.101 - 0.254) .014 - .019 (0.355 - 0.483) TYP .050 (1.270) BSC
SO8 0303
.245 MIN
.030 .005 TYP RECOMMENDED SOLDER PAD LAYOUT
.010 - .020 x 45 (0.254 - 0.508)
.008 - .010 (0.203 - 0.254)
.016 - .050 (0.406 - 1.270)
NOTE: 1. DIMENSIONS IN
INCHES (MILLIMETERS) 2. DRAWING NOT TO SCALE 3. THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS. MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED .006" (0.15mm)
Z Package 3-Lead Plastic TO-92 (Similar to TO-226)
(Reference LTC DWG # 05-08-1410)
.060 .005 (1.524 0.127) DIA .180 .005 (4.572 0.127)
.180 .005 (4.572 0.127)
.90 (2.286) NOM
.500 (12.70) MIN
.050 UNCONTROLLED (1.270) LEAD DIMENSION MAX
5 NOM
.050 (1.27) BSC
.016 .003 (0.406 0.076)
.015 .002 (0.381 0.051)
Z3 (TO-92) 0801
.060 .010 (1.524 0.254)
.098 +.016/-.04 (2.5 +0.4/-0.1) 2 PLCS TO-92 TAPE AND REEL REFER TO TAPE AND REEL SECTION OF LTC DATA BOOK FOR ADDITIONAL INFORMATION
3
2
1
.140 .010 (3.556 0.127)
10 NOM
1009fd
Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology Corporation makes no representation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
7
LT1009 Series
TYPICAL APPLICATIO U
Low Noise 2.5V Buffered Reference
1F VIN 6V 10k 1k 10k 1k 2
- +
7 6 2.5V
LT1001C 3 4
+
100k LT1009 20F
+
20F
1009 TA06
RELATED PARTS
PART NUMBER LT1019 LT1236 LTC(R)1798 LT1460 LT1634 LT1461 DESCRIPTION Precision Series Reference Precision Series Reference Micropower Low Dropout Series Reference Micropower Precision Series Reference Micropower Precision Shunt Voltage Reference Micropower Precision Series Reference COMMENTS Bandgap, 0.05%, 5ppm/C 5V and 10V Zener-Based 5ppm/C, SO-8 Package 0.15% Max, 6.5A Supply Current Bandgap, 130A Supply Current 10ppm/C, Available in SOT-23 Bandgap 0.05%, 10ppm/C, 10A Supply Current 0.04% Max, 3ppm/C Max, 35A Supply Current
1009fd
8
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900 FAX: (408) 434-0507
LT/LWI/LT 0505 REV D * PRINTED IN USA
www.linear.com
(c) LINEAR TECHNOLOGY CORPORATION 1985

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