LT1019
Precision Reference
FEATURES
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DESCRIPTIO
Tight Initial Output Voltage: < 0.05%
Ultralow Drift: 3ppm/°C Typical
Series or Shunt Operation
Curvature Corrected
Ultrahigh Line Rejection:
≈
0.5ppm/V
Low Output Impedance:
≈
0.02Ω
Plug-In Replacement for Present References
Available at 2.5V, 4.5V, 5V, and 10V
100% Noise Tested
Temperature Output
Industrial Temperature Range in SO-8
Available in 8-Lead N8 and S8 Packages
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
very low TC and tight initial output voltage tolerance.
The LT1019 can both sink and source up to 10mA and can
be used in either the series or shunt mode, allowing the
reference to operate with positive or 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 and excellent
line regulation.
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.
, 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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Negative Shunt References
A/D and D/A Converters
Precision Regulators
Constant Current Sources
V/F Converters
Bridge Excitation
TYPICAL APPLICATION
Ultralinear Strain Gauge
15V
357Ω*
0.5W
IN
OUT
350Ω
BRIDGE
GND
R2
20k
R4
20k
ACTIVE
ELEMENT
5V
R3
2M
OUTPUT VOLTAGE (NORMALIZED) (V)
LT1019-5
+
A1
†
LT1637
A2
LT1001
GAIN = 100
–
R5
2M
R6**
2M
LT1019 • TA01
–5V
357Ω*
0.5W
–15V
*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.
U
Output Voltage Drift
1.003
1.002
1.001
1.000
0.999
0.998
0.997
–50 –25
LT1019
CURVE
10ppm/°C
FULL TEMP RANGE “BOX”
5ppm/°C
0°C TO 70°C “BOX”
UNCOMPENSATED
“STANDARD” BANDGAP
DRIFT CURVE
50
25
75
0
TEMPERATURE (˚C)
100
125
1019 TA02
+
–
U
U
1019fd
1
LT1019
ABSOLUTE
AXI U
RATI GS
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
PACKAGE/ORDER I FOR ATIO
TOP VIEW
DNC*
8
DNC* 1
INPUT 2
TEMP
3
4
GND (CASE)
H PACKAGE
8-LEAD TO-5 METAL CAN
*INTERNALLY CONNECTED. DO NOT
CONNECT EXTERNALLY
5
7
DNC*
6 OUTPUT
TRIM
DNC* 1
INPUT 2
TEMP 3
GND 4
N8 PACKAGE
8-LEAD PDIP
*INTERNALLY CONNECTED. DO NOT
CONNECT EXTERNALLY.
T
JMAX
= 100°C,
θ
JA
= 130°C/ W
T
JMAX
= 150°C,
θ
JA
= 150°C/ W,
θ
JC
= 45°C/W
ORDER PART
NUMBER
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
LT1019ACN8-2.5
LT1019ACN8-4.5
LT1019ACN8-5
LT1019ACN8-10
LT1019CN8-2.5
LT1019CN8-4.5
OBSOLETE
CONSIDER THE N8 OR S8 FOR
ALTERNATE SOURCES.
2
U
U
W
W W
U
W
(Note 1)
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
TOP VIEW
8
7
6
5
DNC*
DNC*
OUTPUT
TRIM
DNC* 1
INPUT 2
TEMP 3
GND 4
TOP VIEW
8
7
6
5
DNC*
DNC*
OUTPUT
TRIM
S8 PACKAGE
8-LEAD PLASTIC SO
*INTERNALLY CONNECTED. DO NOT
CONNECT EXTERNALLY.
T
JMAX
= 100°C,
θ
JA
= 130°C/ W
ORDER PART
NUMBER
LT1019CN8-5
LT1019CN8-10
LT1019IN8-2.5
LT1019IN8-4.5
LT1019IN8-5
LT1019IN8-10
ORDER PART
NUMBER
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
S8 PART
MARKING
019A25
1019A5
19AI25
019AI5
1925
1945
1905
1910
19I25
19I05
1019fd
LT1019
AVAILABLE OPTIO S
OUTPUT
VOLTAGE
(V)
2.5
TEMPERATURE
(
°
C)
0 to 70
– 40 to 85
– 55 to 125
4.5
0 to 70
– 40 to 85
– 55 to 125
5
0 to 70
– 40 to 85
– 55 to 125
10
0 to 70
– 40 to 85
– 55 to 125
ACCURACY
(%)
0.05
0.2
0.05
0.2
0.05
0.2
0.05
0.2
0.2
0.05
0.2
0.05
0.2
0.05
0.2
0.05
0.2
0.05
0.2
0.2
0.05
0.2
TEMPERATURE
COEFFICIENT
(ppm/
°
C)
5
20
10
20
10
25
5
20
20
10
25
5
20
10
20
10
25
5
20
20
10
25
LT1019AMH-10
LT1019MH-10
LT1019AMH-5
LT1019MH-5
LT1019ACH-10
LT1019CH-10
LT1019CS8-10
LT1019ACN8-10
LT1019CN8-10
LT1019IN8-10
LT1019AMH-4.5
LT1019MH-4.5
LT1019ACH-5
LT1019CH-5
LT1019ACS8-5
LT1019CS8-5
LT1019AIS8-5
LT1019IS8-5
LT1019ACN8-5
LT1019CN8-5
LT1019IN8-5
LT1019AMH-2.5
LT1019MH-2.5
LT1019ACH-4.5
LT1019CH-4.5
LT1019CS8-4.5
LT1019ACN8-4.5
LT1019CN8-4.5
LT1019IN8-4.5
TO-5
H8
LT1019ACH-2.5
LT1019CH-2.5
PACKAGE TYPE
SO-8
S8
LT1019ACS8-2.5
LT1019CS8-2.5
LT1019AIS8-2.5
LT1019IS8-2.5
PDIP-8
N8
LT1019ACN8-2.5
LT1019CN8-2.5
LT1019IN8-2.5
ELECTRICAL CHARACTERISTICS
The
●
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.
SYMBOL
TC
PARAMETER
Output Voltage Tolerance
Output Voltage
Temperature Coefficient
(Note 3)
Line Regulation (Note 4)
Ripple Rejection
LT1019C (0°C to 70°C)
LT1019I (– 40°C to 85°C)
LT1019M (– 55°C to 125°C)
(V
OUT
+ 1.5V)
≤
V
IN
≤
40V
●
●
●
●
∆V
OUT
∆V
IN
RR
U
CONDITIONS
LT1019A
MIN TYP
MAX
0.02
3
3
5
0.5
1.0
90
84
110
0.05
5
10
10
3
5
MIN
LT1019
TYP
0.02
5
5
8
0.5
1.0
MAX
0.2
20
20
25
3
5
UNITS
%
ppm/°C
ppm/°C
ppm/°C
ppm/V
ppm/V
dB
dB
50Hz
≤
f
≤
400Hz
●
90
84
110
1019fd
3
LT1019
ELECTRICAL CHARACTERISTICS
The
●
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.
SYMBOL
∆V
OUT
∆I
OUT
PARAMETER
Load Regulation Series
Mode (Notes 4, 5)
Load Regulation,
Shunt Mode
Thermal Regulation (Note 7)
I
Q
Quiescent Current
Series Mode
Minimum Shunt Current
Minimum Input/Output
Voltage Differential
Trim Range
(Note 8)
I
OUT
≤
1mA
I
OUT
= 10mA
LT1019-2.5
LT1019-5
LT1019-10
2V
≤
V
IN
≤
35V
●
CONDITIONS
0
≤
I
OUT
≤
10mA (Note 5)
●
MIN
LTC1019A
TYP
MAX
0.02
0.05
0.08
0.4
0.8
0.5
1.0
1.3
0.8
1.1
1.3
MIN
LTC1019
TYP
MAX
0.02
0.05
0.08
0.4
0.8
0.5
1.2
1.5
0.8
1.1
1.3
UNITS
mV/mA (Ω)
mV/mA (Ω)
mV/mA (Ω)
mV/mA (Ω)
ppm/mW
mA
mA
mA
V
V
%
%
%
1mA
≤
I
SHUNT
≤
10mA (Notes 5, 6)
2.5V, 4.5V, 5V
10V
∆P
= 200mW, t = 50ms
●
●
0.1
0.1
0.65
0.1
0.1
0.65
0.5
0.9
±3.5
±3.5
±3.5
±6
5, – 13
5, – 27
25
2.5
2.5
●
●
●
●
0.5
0.9
±3.5
±6
±3.5
5, – 13
±3.5
5, – 27
15
10
25
2.5
2.5
I
SC
e
n
Short-Circuit Current
Output Connected to GND
Output Voltage Noise
(Note 10)
50
4
15
10
50
4
mA
mA
ppm (RMS)
ppm (P-P)
10Hz
≤
f
≤
1kHz
0.1Hz
≤
f
≤
10Hz
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.
1019fd
4
LT1019
TYPICAL PERFOR A CE CHARACTERISTICS
Quiescent Current (LT1019-2.5)
1.6
1.4
1.2
1.6
1.4
1.2
CURRENT (mA)
CURRENT (mA)
1.0
0.8
0.6
0.4
0.2
0
0
5
10
125°C
25°C
–55°C
1.0
0.8
0.6
0.4
0.2
0
125°C
25°C
–55°C
CURRENT (mA)
25 30 35
INPUT VOLTAGE (V)
15
20
Minimum Input/Output Voltage
Differential
10
INPUT VOLTAGE/OUTPUT VOLTAGE (dB)
OUTPUT CURRENT (mA)
OUTPUT CHANGE (mV)
7.5
5.0
T
J
= 125°C
2.5
T
J
= –55°C
T
J
= 25°C
0
0
0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8
INPUT/OUTPUT VOLTAGE (V)
LT1019 • TPC04
Shunt Mode Characteristics
(LT1019-2.5)
1.0
0.9
0.8
0.7
INPUT OPEN
CURRENT (mA)
CURRENT (mA)
0.6
0.5
0.4
0.3
0.2
0.1
0
0
T
J
= 125°C
T
J
= 25°C
T
J
= –55°C
0.5 1.0 1.5 2.0 2.5 3.0 3.5
OUTPUT-TO-GROUND VOLTAGE (V)
4.0
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
T
J
= 125°C
T
J
= 25°C
T
J
= –55°C
CURRENT (mA)
U W
40
LT1019 • TPC01
LT1019 • TPC07
Quiescent Current
(LT1019-4.5/LT1019-5)
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0
5
10
25 30 35
INPUT VOLTAGE (V)
15
20
40
45
0
Quiescent Current (LT1019-10)
125°C
25°C
–55°C
45
0
5
10
25 30 35
INPUT VOLTAGE (V)
15
20
40
45
LT1019 • TPC02
LT1019 • TPC03
Load Regulation
2.0
T
J
= 25°C
1.5
1.0
0.5
0
–0.5
–1.0
–1.5
–2.0
–10 –8 –6 –4 –2 0 2 4 6 8
SINKING
SOURCING
OUTPUT CURENT (mA)
10
LT1019-2.5
LT1019-10
LT1019-4.5/LT1019-5
Ripple Rejection
120
T
J
= 25°C
110
100
90
80
70
60
50
40
10
100
1k
10k
FREQUENCY (Hz)
100k
1M
LT1019-2.5
LT1019-10
LT1019-4.5
LT1019-5
LT1019 • TPC05
LT1019 • TPC06
Shunt Mode Characteristics
(LT1019-5)
1.0
0.9
0.8
0.7
INPUT OPEN
1.0
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
Shunt Mode Characteristics
(LT1019-10)
INPUT OPEN
T
J
= 125°C
T
J
= 25°C
T
J
= –55°C
0
8
2
6
4
10 12 14
OUTPUT-TO-GROUND VOLTAGE (V)
16
LT1019 • TPC08
LT1019 • TPC09
1019fd
5
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