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1
LT1019
Precision Reference
The LT
1019 is a third generation bandgap voltage refer-
ence utilizing thin film technology and a greatly improved
curvature correction technique. Wafer level trimming of
both reference and output voltage combines to produce
units with high yields to very low TC and tight initial
tolerance of output voltage.
The LT1019 can both sink and source up to 10mA and can
be used in either the series or shunt mode. This allows the
reference to be used for both positive and negative output
voltages without external components. Minimum input/
output voltage is less than 1V in the series mode, providing
improved tolerance of low line conditions.
The LT1019 is available in four voltages: 2.5V, 4.5V, 5V
and 10V. It is a direct replacement for most bandgap
references presently available including AD580, AD581,
REF-01, REF-02, MC1400, MC1404 and LM168.
s
Tight Initial Output Voltage: < 0.05%
s
Ultralow Drift: 3ppm/
C Typical
s
Series or Shunt Operation
s
Curvature Corrected
s
Ultrahigh Line Rejection:
0.5ppm/V
s
Low Output Impedance:
0.02
s
Plug-In Replacement for Present References
s
Available at 2.5V, 4.5V, 5V, and 10V
s
100% Noise Tested
s
Temperature Output
s
Industrial Temperature Range in SO-8
s
Negative Shunt References
s
A/D and D/A Converters
s
Precision Regulators
s
Constant Current Sources
s
V/F Converters
s
Bridge Excitation
Ultralinear Strain Guage
Output Voltage Drift
FEATURES
DESCRIPTIO
U
APPLICATIO S
U
TYPICAL APPLICATIO
N
U
+
A1
LT1637
+
A2
LT1001
R3
2M
R2
20k
R4
20k
GAIN = 100
R5
2M
R6**
2M
IN
LT1019-5
GND
OUT
15V
5V
357
*
0.5W
ACTIVE
ELEMENT
350
BRIDGE
15V
5V
357
*
0.5W
REDUCES REFERENCE AND AMPLIFIER
LOADING TO
0.
IF R6 = R3, BRIDGE IS NOT LOADED BY R2 AND R4.
A1 V
OS
AND DRIFT ARE NOT CRITICAL BECAUSE A2
ACTS AS A DIFFERENTIAL AMPLIFIER.
*
**
LT1019 TA01
TEMPERATURE (C)
50
OUTPUT VOLTAGE (NORMALIZED) (V)
1.001
1.002
1.003
25
75
1019 TA02
1.000
0.999
25
0
50
100
125
0.998
0.997
5ppm/
C
0
C TO 70
C "BOX"
LT1019
CURVE
UNCOMPENSATED
"STANDARD" BANDGAP
DRIFT CURVE
10ppm/
C
FULL TEMP RANGE "BOX"
, LTC and LT are registered trademarks of Linear Technology Corporation.
2
LT1019
A
U
G
W
A
W
U
W
A
R
BSOLUTE
XI
TI
S
Input Voltage .......................................................... 40V
Output Voltage (Note 2)
LT1019-5, LT1019-10 ........................................ 16V
LT1019-2.5, LT1019-4.5 ...................................... 7V
Output Short-Circuit Duration (Note 2)
V
IN
< 20V .................................................... Indefinite
20V
V
IN
35V ............................................. 10 sec
Specified Temperature Range
Commercial ............................................. 0
C to 70
C
Industrial ............................................ 40
C to 85
C
Military ............................................. 55
C to 125
C
Trim Pin Voltage ...................................................
30V
Temp Pin Voltage ..................................................... 5V
Storage Temperature Range (Note 11) 65
C to 150
C
Lead Temperature (Soldering, 10 sec)................. 300
C
W
U
U
PACKAGE/ORDER I FOR ATIO
S8 PART
MARKING
ORDER PART
NUMBER
LT1019ACN8-2.5
LT1019ACN8-4.5
LT1019ACN8-5
LT1019ACN8-10
LT1019CN8-2.5
LT1019CN8-4.5
T
JMAX
= 100
C,
JA
= 130
C/ W
LT1019CN8-5
LT1019CN8-10
LT1019IN8-2.5
LT1019IN8-4.5
LT1019IN8-5
LT1019IN8-10
T
JMAX
= 150
C,
JA
= 150
C/ W,
JC
= 45
C/W
TOP VIEW
DNC*
DNC*
DNC*
INPUT
OUTPUT
TRIM
TEMP
GND (CASE)
8
7
6
5
3
2
1
4
H PACKAGE
8-LEAD TO-5 METAL CAN
*INTERNALLY CONNECTED. DO NOT
CONNECT EXTERNALLY
ORDER PART
NUMBER
19A25
19A05
19AI2
19AI5
1925
1945
1905
1910
19I25
19I05
(Note 1)
ORDER PART
NUMBER
1
2
3
4
8
7
6
5
TOP VIEW
DNC*
INPUT
TEMP
GND
DNC*
DNC*
OUTPUT
TRIM
N8 PACKAGE
8-LEAD PDIP
*INTERNALLY CONNECTED. DO NOT
CONNECT EXTERNALLY.
T
JMAX
= 100
C,
JA
= 130
C/ W
TOP VIEW
S8 PACKAGE
8-LEAD PLASTIC SO
1
2
3
4
8
7
6
5
DNC*
INPUT
TEMP
GND
DNC*
DNC*
OUTPUT
TRIM
*INTERNALLY CONNECTED. DO NOT
CONNECT EXTERNALLY.
LT1019ACH-2.5
LT1019ACH-4.5
LT1019ACH-5
LT1019ACH-10
LT1019AMH-2.5
LT1019AMH-4.5
LT1019AMH-5
LT1019AMH-10
LT1019CH-2.5
LT1019CH-4.5
LT1019CH-5
LT1019CH-10
LT1019MH-2.5
LT1019MH-4.5
LT1019MH-5
LT1019MH-10
LT1019ACS8-2.5
LT1019ACS8-5
LT1019AIS8-2.5
LT1019AIS8-5
LT1019CS8-2.5
LT1019CS8-4.5
LT1019CS8-5
LT1019CS8-10
LT1019IS8-2.5
LT1019IS8-5
3
LT1019
AVAILABLE OPTIO S
U
OUTPUT
TEMPERATURE
PACKAGE TYPE
VOLTAGE
TEMPERATURE
ACCURACY
COEFFICIENT
TO-5
SO-8
PDIP-8
(V)
(
C)
(%)
(ppm/
C)
H8
S8
N8
2.5
0 to 70
0.05
5
LT1019ACH-2.5
LT1019ACS8-2.5
LT1019ACN8-2.5
0.2
20
LT1019CH-2.5
LT1019CS8-2.5
LT1019CN8-2.5
40 to 85
0.05
10
LT1019AIS8-2.5
0.2
20
LT1019IS8-2.5
LT1019IN8-2.5
55 to 125
0.05
10
LT1019AMH-2.5
0.2
25
LT1019MH-2.5
4.5
0 to 70
0.05
5
LT1019ACH-4.5
LT1019ACN8-4.5
0.2
20
LT1019CH-4.5
LT1019CS8-4.5
LT1019CN8-4.5
40 to 85
0.2
20
LT1019IN8-4.5
55 to 125
0.05
10
LT1019AMH-4.5
0.2
25
LT1019MH-4.5
5
0 to 70
0.05
5
LT1019ACH-5
LT1019ACS8-5
LT1019ACN8-5
0.2
20
LT1019CH-5
LT1019CS8-5
LT1019CN8-5
40 to 85
0.05
10
LT1019AIS8-5
0.2
20
LT1019IS8-5
LT1019IN8-5
55 to 125
0.05
10
LT1019AMH-5
0.2
25
LT1019MH-5
10
0 to 70
0.05
5
LT1019ACH-10
LT1019ACN8-10
0.2
20
LT1019CH-10
LT1019CS8-10
LT1019CN8-10
40 to 85
0.2
20
LT1019IN8-10
55 to 125
0.05
10
LT1019AMH-10
0.2
25
LT1019MH-10
ELECTRICAL C
C
HARA TERISTICS
LT1019A
LT1019
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
MIN
TYP
MAX
UNITS
Output Voltage Tolerance
0.02
0.05
0.02
0.2
%
TC
Output Voltage
LT1019C (0
C to 70
C)
q
3
5
5
20
ppm/
C
Temperature Coefficient
LT1019I ( 40
C to 85
C)
q
3
10
5
20
ppm/
C
(Note 3)
LT1019M ( 55
C to 125
C)
q
5
10
8
25
ppm/
C
V
OUT
Line Regulation (Note 4)
(V
OUT
+ 1.5V)
V
IN
40V
0.5
3
0.5
3
ppm/V
V
IN
q
1.0
5
1.0
5
ppm/V
RR
Ripple Rejection
50Hz
f
400Hz
90
110
90
110
dB
q
84
84
dB
The
q
denotes specifications which apply over the full operating temperature range, otherwise specifications are TA = 25
C.
V
IN
= 15V, I
OUT
= 0 unless otherwise noted.
4
LT1019
LTC1019A
LTC1019
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
MIN
TYP
MAX
UNITS
V
OUT
Load Regulation Series
0
I
OUT
10mA (Note 5)
0.02
0.05
0.02
0.05
mV/mA (
)
I
OUT
Mode (Notes 4, 5)
q
0.08
0.08
mV/mA (
)
Load Regulation,
1mA
I
SHUNT
10mA (Notes 5, 6)
Shunt Mode
2.5V, 4.5V, 5V
q
0.1
0.4
0.1
0.4
mV/mA (
)
10V
q
0.8
0.8
mV/mA (
)
Thermal Regulation (Note 7)
P = 200mW, t = 50ms
0.1
0.5
0.1
0.5
ppm/mW
I
Q
Quiescent Current
0.65
1.0
0.65
1.2
mA
Series Mode
q
1.3
1.5
mA
Minimum Shunt Current
(Note 8)
q
0.5
0.8
0.5
0.8
mA
Minimum Input/Output
I
OUT
1mA
q
0.9
1.1
0.9
1.1
V
Voltage Differential
I
OUT
= 10mA
q
1.3
1.3
V
Trim Range
LT1019-2.5
3.5
6
3.5
6
%
LT1019-5
3.5 5, 13
3.5
5, 13
%
LT1019-10
3.5 5, 27
3.5
5, 27
%
I
SC
Short-Circuit Current
2V
V
IN
35V
15
25
50
15
25
50
mA
Output Connected to GND
q
10
10
mA
e
n
Output Voltage Noise
10Hz
f
1kHz
2.5
4
2.5
4
ppm (RMS)
(Note 10)
0.1Hz
f
10Hz
2.5
2.5
ppm (P-P)
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2: These are high power conditions and are therefore guaranteed
only at temperatures equal to or below 70
C. Input is either floating, tied to
output or held higher than output.
Note 3: Output voltage drift is measured using the box method. Output
voltage is recorded at T
MIN
, 25
C and T
MAX
. The lowest of these three
readings is subtracted from the highest and the resultant difference is
divided by (T
MAX
T
MIN
).
Note 4: Line regulation and load regulation are measured on a pulse basis
with low duty cycle. Effects due to die heating must be taken into account
separately. See thermal regulation and application section.
Note 5: Load regulation is measured at a point 1/8" below the base of the
package with Kelvin contacts.
Note 6: Shunt regulation is measured with the input floating. This
parameter is also guaranteed with the input connected (V
IN
V
OUT
) > 1V,
0mA
I
SINK
10mA. Shunt and sink current flow into the output.
Note 7: Thermal regulation is caused by die temperature gradients created
by load current or input voltage changes. This effect must be added to
normal line or load regulation.
Note 8: Minimum shunt current is measured with shunt voltage held
20mV below the value measured at 1mA shunt current.
Note 9: Minimum input/output voltage is measured by holding input
voltage 0.5V above the nominal output voltage, while measuring
V
IN
V
OUT
.
Note 10: RMS noise is measured with a single pole highpass filter at 10Hz
and a 2-pole lowpass filter at 1kHz. The resulting output is full-wave
rectified and then integrated for a fixed period, making the final reading an
average as opposed to RMS. A correction factor of 1.1 is used to convert
from average to RMS, and a second correction of 0.88 is used to correct
the nonideal bandpass of the filters.
Note 11: If the part is stored outside of the specified temperature range,
the output may shift due to hysteresis.
ELECTRICAL C
C
HARA TERISTICS
The
q
denotes specifications which apply over the full operating temperature range, otherwise specifications are TA = 25
C.
V
IN
= 15V, I
OUT
= 0 unless otherwise noted.
5
LT1019
C
C
HARA TERISTICS
U
W
A
TYPICAL PERFOR
CE
Quiescent Current (LT1019-10)
Quiescent Current (LT1019-2.5)
INPUT VOLTAGE (V)
0
CURRENT (mA)
0.8
1.0
1.2
40
LT1019 TPC01
0.6
0.4
0
10
20
30
0.2
1.6
1.4
35
5
15
25
45
125C
25C
55C
INPUT VOLTAGE (V)
0
CURRENT (mA)
0.8
1.0
1.2
40
LT1019 TPC03
0.6
0.4
0
10
20
30
0.2
1.6
1.4
35
5
15
25
45
125C
25C
55C
Minimum Input/Output Voltage
Differential
Load Regulation
Ripple Rejection
INPUT/OUTPUT VOLTAGE (V)
0
0
OUTPUT CURRENT (mA) 2.5
7.5
10
0.4
0.8 1.0
1.8
LT1019 TPC04
5.0
0.2
0.6
1.2 1.4 1.6
T
J
= 25C
T
J
= 55C
T
J
= 125C
OUTPUT CURENT (mA)
10
OUTPUT CHANGE (mV)
1.0
2.0
6
LT1019 TPC05
0
1.0
2.0
6
2
2
10
0.5
1.5
0.5
1.5
4
8
4
0
8
SINKING
SOURCING
T
J
= 25C
LT1019-10
LT1019-4.5/LT1019-5
LT1019-2.5
FREQUENCY (Hz)
60
INPUT VOLTAGE
/OUTPUT VOLTAGE (dB)
70
90
110
120
10
1k
10k
1M
LT1019 TPC06
50
100
100k
100
80
40
LT1019-10
LT1019-4.5
LT1019-5
LT1019-2.5
T
J
= 25C
Shunt Mode Characteristics
(LT1019-10)
Shunt Mode Characteristics
(LT1019-5)
Shunt Mode Characteristics
(LT1019-2.5)
OUTPUT-TO-GROUND VOLTAGE (V)
0
0
CURRENT (mA)
0.1
0.3
0.4
0.5
1.0
0.7
1.0
2.0
2.5
LT1019 TPC07
0.2
0.8
0.9
0.6
0.5
1.5
3.0
3.5
4.0
INPUT OPEN
T
J
= 125C
T
J
= 25C
T
J
= 55C
OUTPUT-TO-GROUND VOLTAGE (V)
0
0
CURRENT (mA)
0.1
0.3
0.4
0.5
1.0
0.7
2
4
5
LT1019 TPC08
0.2
0.8
0.9
0.6
1
3
6
7
8
INPUT OPEN
T
J
= 55C
T
J
= 125C
T
J
= 25C
INPUT VOLTAGE (V)
0
CURRENT (mA)
0.8
1.0
1.2
40
LT1019 TPC02
0.6
0.4
0
10
20
30
0.2
1.6
1.4
35
5
15
25
45
125C
25C
55C
Quiescent Current
(LT1019-4.5/LT1019-5)
OUTPUT-TO-GROUND VOLTAGE (V)
0
0
CURRENT (mA)
0.1
0.3
0.4
0.5
1.0
0.7
4
8
10
LT1019 TPC09
0.2
0.8
0.9
0.6
2
6
12
14
16
INPUT OPEN
T
J
= 55C
T
J
= 125C
T
J
= 25C