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LT1029/LT1029A 5V Bandgap Reference
FEATURES

DESCRIPTIO
0.2% Output Tolerance 0.6 Shunt Impedance 700A to 10mA Operating Current Pin Compatible with LM136-5 20ppm/C Max Drift Output Voltage Trim does not Affect Drift Can be Used as Positive or Negative Reference
The LT (R)1029 is a 5V bandgap reference intended for use in the shunt or "Zener" mode, allowing it to be used as either a positive or negative reference. The output is pretrimmed to 0.2% accuracy with 20ppm/C maximum temperature drift. A trim pin allows additional output adjustment for even more precise output voltage. Operating current range for the LT1029 is 700A to 10mA. Extremely low dynamic impedance allows excellent output regulation even with fluctuating operating current. The LT1029 will replace an LM136-5 or LM336-5 and simplify circuits using the "minimum temperature coefficient" trim network. The LT1029 does not require this special network to meet its temperature drift specification; these application network components are simply removed. If output trimming is required for initial accuracy, the diodes in the trim network should be replaced with jumpers.
, LTC and LT are registered trademarks of Linear Technology Corporation.
APPLICATIO S

A-to-D and D-to-A Converters Precision Regulators Precision Current Sources V to F and F to V Converters
TYPICAL APPLICATIO
15V R1 10k
5.015 5.010
5V LT1029
OUTPUT VOLTAGE (V)
5.005 5.000 4.995 4.990 4.895 -50
LT1029 -5V R2 10k -15V
LT1029 * TA01
-25
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Output Voltage Drift
0 25 50 75 TEMPERATURE (C) 100 125
LT1029 * TA02
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LT1029/LT1029A
ABSOLUTE
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RATI GS
Reverse Current .................................................... 15mA Forward Current ................................................... 10mA Operating Temperature Range LT1029C/LT1029AC ............................... 0C to 70C LT1029M/LT1029AM (OBSOLETE) ....- 55C to 125C
PACKAGE/ORDER I FOR ATIO
BOTTOM VIEW ADJ + -
ORDER PART NUMBER LT1029AMH LT1029MH LT1029ACH LT1029CH
BOTTOM VIEW ADJ + -
H PACKAGE TO-46 METAL CAN TJMAX = 150C, JA = 440C/W, JC = 80C/W
OBSOLETE PACKAGE
Consider the Z Package as an Alternate Source
Consult LTC Marketing for parts specified with wider operating temperature ranges.
ELECTRICAL CHARACTERISTICS
PARAMETER Reverse Breakdown Voltage Reverse Breakdown Change with Current Reverse Dynamic Impedance Temperature Stability CONDITIONS IR = 1mA
The denotes the specifications which apply over the full operating temperature range, otherwise specifications are TA = 25C.
MIN 4.99 4.95
LT1029AM/LT1029AC LT1029M/LT1029C
700A IR 10mA IR = 1mA
IR = 1mA
Equivalent Temperature Drift
LT1029AM/LT1029AC LT1029C LT1029M
Long Term Stability Trim Range Note 1: Absolute Maximum Ratings are those values beyond which the life of a device may be impaired. 3
2
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(Note 1)
Storage Temperature ............................ - 65C to 150C Lead Temperature (Soldering, 10 sec).................. 300C
ORDER PART NUMBER LT1029ACZ LT1029CZ
Z PACKAGE TO-92 PLASTIC TJMAX = 100C, JA = 160C/W
TYP 5.00 5.00 2 3 0.2 0.3 3 5 7 10 8 12 15 20 + 5, - 13
MAX 5.01 5.05 5 8 0.6 1.0 7 12 18 36 20 34 40
UNITS V V mV mV mV mV mV mV ppm/C ppm/C ppm/C ppm/kHr %
LT1029AC LT1029C LT1029AM LT1029M

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LT1029/LT1029A TYPICAL PERFOR A CE CHARACTERISTICS
Reverse Characteristics
1.0 0.9 0.8 0.7
CURRENT (mA)
APPLICATIO S I FOR ATIO
Output Trimming
Output voltage trimming on the LT1029 is nominally accomplished with a potentiometer connected from output to ground with the wiper tied to the trim pin. The LT1029 was made compatible with existing references, so the trim range is large; 5%, - 13%. This large trim range makes precision trimming rather difficult. One solution is to insert resistors in series with both ends of the potentiometer. This has the disadvantage of potentially poor tracking between the fixed resistors and the potentiometer. A second method of reducing trim range is to insert a resistor in series with the wiper of the potentiometer. This works well only for a very small trim range because of the mismatch in TCs between the series resistor and the internal thin film resistors. These film resistors can have a TC as high as 500ppm/C. That same TC is then transferred to the change in output voltage; a 1% shift in output voltage causes a (500ppm) (1%) = 5ppm/C change in output voltage drift. The worst case error in initial output voltage for the LT1029A is 0.2% and the LT1029 is 1%, so a series resistor is satisfactory if the output is simply trimmed to nominal value. 1ppm/C TC shift would be the maximum expected for the LT1029A and 5ppm/C for the LT1029. Shunt Capacitance The LT1029 is stable with all values of shunt capacitance, but values between 300pF and 0.01F are not recommended because they cause longer settling following a
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.
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0.6 0.5 0.4 0.3 0.2 0.1 0 0 7 6 4 1 3 2 5 OUTPUT TO GROUND VOLTAGE (V) 8 TJ = 125C TJ = - 55C TJ = 25C
LT1029 * TPC01
UU
transient in operating current. A 1F solid tantalum capacitor is suggested for most situations where bypassing is desirable.
Wide Trim Range (5%, - 13%)
V+ I 900A VREF 25k
LT1029 * AI01
Narrow Trim Range
V+ I 800A VREF = 5.000V R1* 100k TRIM RANGE 0.4% - LT1029A, R1 = 750k 1.2% - LT1029, R1 = 250k
LT1029 * TA02
Trimming Output to 5.120V
V+ I 800A VREF = 5.120V R1 41.2k R2 5k R3 4.02k
LT1029 * AI03
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LT1029/LT1029A
APPLICATIO S I FOR ATIO
LT1029
PACKAGE DESCRIPTIO
H Package 2-Lead and 3-Lead TO-46 Metal Can
(Reference LTC DWG # 05-08-1340)
.209 - .219 (5.309 - 5.537) .178 - .195 (4.521 - 4.953) .500 (12.700) MIN SEATING* PLANE .036 - .046 (0.914 - 1.168) .050 (1.270) TYP .100 (2.540) TYP PIN 1 FOR 3-LEAD PACKAGE ONLY 45 .028 - .048 (0.711 - 1.219)
H02/03(TO-46) 0801
.085 - .105 (2.159 - 2.667)
REFERENCE PLANE
.025 (0.635) MAX .016 - .019** (0.406 - 0.483) DIA
*LEAD DIAMETER IS UNCONTROLLED BETWEEN THE REFERENCE PLANE AND .050" BELOW THE REFERENCE PLANE .016 - .024 **FOR SOLDER DIP LEAD FINISH, LEAD DIAMETER IS (0.406 - 0.610)
OBSOLETE PACKAGE
Z Package 3-Lead Plastic TO-92 (Similar to TO-226)
(Reference LTC DWG # 05-08-1330)
.060 .005 (1.524 0.127) DIA .180 .005 (4.572 0.127) .060 .010 (1.524 0.254)
.180 .005 (4.572 0.127)
.90 (2.286) NOM 5 NOM
.500 (12.70) MIN
.050 UNCONTROLLED (1.270) LEAD DIMENSION MAX
.050 (1.27) BSC
.016 .003 (0.406 0.076)
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Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900 FAX: (408) 434-0507
www.linear.com
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Split 2.5V References
R1 25k 0.1% R2 25k 0.1% 2.5V 5V
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-
LT1001
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- 5V - 2.5V
R3 1k 5% - 5V
LT1029 * AI04
.050 (1.270) TYP
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2
1
.140 .010 (3.556 0.127)
10 NOM
.015 .002 (0.381 0.051)
Z3 (TO-92) 0801
TO-92 TAPE AND REEL REFER TO TAPE AND REEL SECTION OF LTC DATA BOOK FOR ADDITIONAL INFORMATION
.098 +.016/-.04 (2.5 +0.4/-0.1) 2 PLCS
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LINEAR TECHNOLOGY CORPORATION 1985

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