LINER LT1029AMH 5v bandgap reference Datasheet

LT1029/LT1029A
5V Bandgap Reference
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FEATURES
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DESCRIPTIO
0.2% Output Tolerance
0.6Ω Shunt Impedance
700µA 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
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APPLICATIO S
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The LT ®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 700µA 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.
A-to-D and D-to-A Converters
Precision Regulators
Precision Current Sources
V to F and F to V Converters
, LTC and LT are registered trademarks of Linear Technology Corporation.
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TYPICAL APPLICATIO
Output Voltage Drift
5.015
15V
R1
10k
5V
LT1029
LT1029
–5V
R2
10k
–15V
OUTPUT VOLTAGE (V)
5.010
5.005
5.000
4.995
4.990
LT1029 • TA01
4.895
–50
–25
0
25
50
75
TEMPERATURE (°C)
100
125
LT1029 • TA02
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LT1029/LT1029A
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ABSOLUTE
RATI GS
(Note 1)
Reverse Current .................................................... 15mA
Forward Current ................................................... 10mA
Operating Temperature Range
LT1029C/LT1029AC ............................... 0°C to 70°C
LT1029M/LT1029AM (OBSOLETE) ....– 55°C to 125°C
Storage Temperature ............................ – 65°C to 150°C
Lead Temperature (Soldering, 10 sec).................. 300°C
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PACKAGE/ORDER I FOR ATIO
ORDER PART
NUMBER
BOTTOM VIEW
ADJ
+
ORDER PART
NUMBER
BOTTOM VIEW
LT1029AMH
LT1029MH
LT1029ACH
LT1029CH
–
H PACKAGE
TO-46 METAL CAN
TJMAX = 150°C, θJA = 440°C/W, θJC = 80°C/W
ADJ
+
LT1029ACZ
LT1029CZ
–
Z PACKAGE
TO-92 PLASTIC
TJMAX = 100°C, θJA = 160°C/W
OBSOLETE PACKAGE
Consider the Z Package as an Alternate Source
Consult LTC Marketing for parts specified with wider operating temperature ranges.
ELECTRICAL CHARACTERISTICS
The ● denotes the specifications which apply over the full operating
temperature range, otherwise specifications are TA = 25°C.
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Reverse Breakdown Voltage
IR = 1mA
4.99
4.95
5.00
5.00
5.01
5.05
V
V
Reverse Breakdown Change with Current
700µA ≤ IR ≤ 10mA
●
2
3
5
8
mV
mV
●
0.2
0.3
0.6
1.0
Ω
Ω
LT1029AC
LT1029C
LT1029AM
LT1029M
●
●
●
●
3
5
7
10
7
12
18
36
mV
mV
mV
mV
LT1029AM/LT1029AC
LT1029C
LT1029M
●
●
●
8
12
15
20
34
40
ppm/°C
ppm/°C
ppm/°C
Reverse Dynamic Impedance
Temperature Stability
Equivalent Temperature Drift
LT1029AM/LT1029AC
LT1029M/LT1029C
IR = 1mA
IR = 1mA
Long Term Stability
Trim Range
20
±3
+ 5, – 13
ppm/kHr
%
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
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LT1029/LT1029A
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TYPICAL PERFOR A CE CHARACTERISTICS
Reverse Characteristics
1.0
0.9
0.8
CURRENT (mA)
0.7
0.6
0.5
TJ = 25°C
0.4
0.3
TJ = 125°C
0.2
TJ = – 55°C
0.1
0
7
6
4
1
3
2
5
OUTPUT TO GROUND VOLTAGE (V)
0
8
LT1029 • TPC01
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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.
transient in operating current. A 1µF solid tantalum
capacitor is suggested for most situations where
bypassing is desirable.
Wide Trim Range (5%, – 13%)
V+
I ≥ 900µA
VREF
25k
LT1029 • AI01
Narrow Trim Range
V+
I ≥ 800µA
VREF = 5.000V
R1*
100k
LT1029 • TA02
TRIM RANGE
0.4% – LT1029A, R1 = 750k
1.2% – LT1029, R1 = 250k
Trimming Output to 5.120V
V+
I ≥ 800µA
VREF = 5.120V
R1
41.2k
Shunt Capacitance
R2
5k
The LT1029 is stable with all values of shunt capacitance,
but values between 300pF and 0.01µF are not recommended because they cause longer settling following a
R3
4.02k
LT1029 • AI03
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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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LT1029/LT1029A
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APPLICATIO S I FOR ATIO
Split ± 2.5V References
2.5V
R1
25k
0.1%
LT1029
5V
–
LT1001
R2
25k
0.1%
+
– 5V
– 2.5V
R3
1k
5%
– 5V
LT1029 • AI04
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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)
REFERENCE
PLANE
.050
(1.270)
TYP
.085 – .105
(2.159 – 2.667)
.100
(2.540)
TYP
.050
(1.270)
TYP
PIN 1
.500
(12.700)
MIN
FOR 3-LEAD PACKAGE ONLY
.025
(0.635)
MAX
.016 – .019**
(0.406 – 0.483)
DIA
SEATING*
PLANE
45°
.036 – .046
(0.914 – 1.168)
.028 – .048
(0.711 – 1.219)
H02/03(TO-46) 0801
*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
.060 ± .010
(1.524 ± 0.254)
.180 ± .005
(4.572 ± 0.127)
.90
(2.286)
NOM
.180 ± .005
(4.572 ± 0.127)
3
2
.140 ± .010
(3.556 ± 0.127)
1
5°
NOM
10° NOM
.500
(12.70)
MIN
.050 UNCONTROLLED
(1.270) LEAD DIMENSION
MAX
.015 ± .002
(0.381 ± 0.051)
TO-92 TAPE AND REEL
REFER TO TAPE AND REEL SECTION OF
LTC DATA BOOK FOR ADDITIONAL INFORMATION
Z3 (TO-92) 0801
.050
(1.27)
BSC
.016 ± .003
(0.406 ± 0.076)
.098 +.016/–.04
(2.5 +0.4/–0.1)
2 PLCS
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Linear Technology Corporation
LT/TP 1102 1K REV A • PRINTED IN USA
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900 ● FAX: (408) 434-0507
●
www.linear.com
 LINEAR TECHNOLOGY CORPORATION 1985
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