LINER LT1019AMH-5

LT1019
Precision Reference
U
FEATURES
■
■
■
■
■
■
■
■
■
■
■
DESCRIPTIO
The LT ®1019 is a third generation bandgap voltage reference 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.
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
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.
U
APPLICATIO S
■
■
■
■
■
■
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.
Negative Shunt References
A/D and D/A Converters
Precision Regulators
Constant Current Sources
V/F Converters
Bridge Excitation
, LTC and LT are registered trademarks of Linear Technology Corporation.
U
TYPICAL APPLICATION
Output Voltage Drift
Ultralinear Strain Guage
357Ω*
0.5W
IN
5V
1.003
R3
2M
OUT
350Ω
BRIDGE
LT1019-5
R2
20k
GND
+
A1†
LT1637
R4
20k
–
ACTIVE
ELEMENT
–5V
357Ω*
0.5W
–15V
–
A2
GAIN = 100
+LT1001
R5
2M
R6**
2M
LT1019 • TA01
*REDUCES REFERENCE AND AMPLIFIER
LOADING TO ≈0.
**IF R6 = R3, BRIDGE IS NOT LOADED BY R2 AND R4.
†
A1 VOS AND DRIFT ARE NOT CRITICAL BECAUSE A2
ACTS AS A DIFFERENTIAL AMPLIFIER.
OUTPUT VOLTAGE (NORMALIZED) (V)
15V
1.002
10ppm/°C
FULL TEMP RANGE “BOX”
1.001
LT1019
CURVE
1.000
0.999
5ppm/°C
0°C TO 70°C “BOX”
0.998
UNCOMPENSATED
“STANDARD” BANDGAP
DRIFT CURVE
0.997
–50 –25
50
25
75
0
TEMPERATURE (˚C)
100
125
1019 TA02
1
LT1019
W W
W
AXI U
U
ABSOLUTE
RATI GS
(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
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)
VIN < 20V .................................................... Indefinite
20V ≤ VIN ≤ 35V ............................................. 10 sec
U
W
U
PACKAGE/ORDER I FOR ATIO
TOP VIEW
TOP VIEW
DNC*
8
DNC* 1
7
6 OUTPUT
INPUT 2
TEMP
DNC*
5
3
TRIM
TOP VIEW
DNC* 1
8
DNC*
DNC* 1
8
DNC*
INPUT 2
7
DNC*
INPUT 2
7
DNC*
TEMP 3
6
OUTPUT
TEMP 3
6
OUTPUT
GND 4
5
TRIM
GND 4
5
TRIM
4
GND (CASE)
H PACKAGE
8-LEAD TO-5 METAL CAN
*INTERNALLY CONNECTED. DO NOT
CONNECT EXTERNALLY
TJMAX = 150°C, θJA = 150°C/ W, θJC = 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
2
LT1019CH-2.5
LT1019CH-4.5
LT1019CH-5
LT1019CH-10
LT1019MH-2.5
LT1019MH-4.5
LT1019MH-5
LT1019MH-10
N8 PACKAGE
8-LEAD PDIP
*INTERNALLY CONNECTED. DO NOT
CONNECT EXTERNALLY.
TJMAX = 100°C, θJA = 130°C/ W
ORDER PART
NUMBER
LT1019ACN8-2.5
LT1019ACN8-4.5
LT1019ACN8-5
LT1019ACN8-10
LT1019CN8-2.5
LT1019CN8-4.5
LT1019CN8-5
LT1019CN8-10
LT1019IN8-2.5
LT1019IN8-4.5
LT1019IN8-5
LT1019IN8-10
S8 PACKAGE
8-LEAD PLASTIC SO
*INTERNALLY CONNECTED. DO NOT
CONNECT EXTERNALLY.
TJMAX = 100°C, θJA = 130°C/ W
ORDER PART
NUMBER
S8 PART
MARKING
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
19A25
19A05
19AI2
19AI5
1925
1945
1905
1910
19I25
19I05
LT1019
U
AVAILABLE OPTIO S
OUTPUT
VOLTAGE
(V)
TEMPERATURE
(°C)
ACCURACY
(%)
TEMPERATURE
COEFFICIENT
(ppm/°C)
TO-5
H8
PACKAGE TYPE
SO-8
S8
PDIP-8
N8
2.5
0 to 70
0.05
0.2
5
20
LT1019ACH-2.5
LT1019CH-2.5
LT1019ACS8-2.5
LT1019CS8-2.5
LT1019ACN8-2.5
LT1019CN8-2.5
– 40 to 85
0.05
0.2
10
20
LT1019AIS8-2.5
LT1019IS8-2.5
LT1019IN8-2.5
– 55 to 125
0.05
0.2
10
25
LT1019AMH-2.5
LT1019MH-2.5
0 to 70
0.05
0.2
5
20
LT1019ACH-4.5
LT1019CH-4.5
LT1019CS8-4.5
LT1019ACN8-4.5
LT1019CN8-4.5
– 40 to 85
0.2
20
– 55 to 125
0.05
0.2
10
25
LT1019AMH-4.5
LT1019MH-4.5
0 to 70
0.05
0.2
5
20
LT1019ACH-5
LT1019CH-5
– 40 to 85
0.05
0.2
10
20
– 55 to 125
0.05
0.2
10
25
LT1019AMH-5
LT1019MH-5
0 to 70
0.05
0.2
5
20
LT1019ACH-10
LT1019CH-10
– 40 to 85
0.2
20
– 55 to 125
0.05
0.2
10
25
4.5
5
10
LT1019IN8-4.5
LT1019ACS8-5
LT1019CS8-5
LT1019ACN8-5
LT1019CN8-5
LT1019AIS8-5
LT1019IS8-5
LT1019IN8-5
LT1019CS8-10
LT1019ACN8-10
LT1019CN8-10
LT1019IN8-10
LT1019AMH-10
LT1019MH-10
ELECTRICAL CHARACTERISTICS
The ● denotes specifications which apply over the full operating temperature range, otherwise specifications are TA = 25°C.
VIN = 15V, IOUT = 0 unless otherwise noted.
SYMBOL
PARAMETER
CONDITIONS
TC
Output Voltage
Temperature Coefficient
(Note 3)
LT1019C (0°C to 70°C)
LT1019I (– 40°C to 85°C)
LT1019M (– 55°C to 125°C)
∆VOUT
∆VIN
Line Regulation (Note 4)
(VOUT + 1.5V) ≤ VIN ≤ 40V
RR
Ripple Rejection
MIN
Output Voltage Tolerance
LT1019A
TYP
MAX
MIN
LT1019
TYP
MAX
UNITS
0.02
0.05
0.02
0.2
%
●
●
●
3
3
5
5
10
10
5
5
8
20
20
25
ppm/°C
ppm/°C
ppm/°C
●
0.5
1.0
3
5
0.5
1.0
3
5
ppm/V
ppm/V
50Hz ≤ f ≤ 400Hz
●
90
84
110
90
84
110
dB
dB
3
LT1019
ELECTRICAL CHARACTERISTICS
The ● denotes specifications which apply over the full operating temperature range, otherwise specifications are TA = 25°C.
VIN = 15V, IOUT = 0 unless otherwise noted.
SYMBOL
PARAMETER
CONDITIONS
∆VOUT
∆IOUT
Load Regulation Series
Mode (Notes 4, 5)
0 ≤ IOUT ≤ 10mA (Note 5)
Load Regulation,
Shunt Mode
1mA ≤ ISHUNT ≤ 10mA (Notes 5, 6)
2.5V, 4.5V, 5V
10V
Thermal Regulation (Note 7)
∆P = 200mW, t = 50ms
IQ
ISC
en
LTC1019A
TYP
MAX
Quiescent Current
Series Mode
●
●
MIN
LTC1019
TYP
MAX
UNITS
0.02
0.05
0.08
0.02
0.05
0.08
mV/mA (Ω)
mV/mA (Ω)
0.1
0.4
0.8
0.1
0.4
0.8
mV/mA (Ω)
mV/mA (Ω)
0.1
0.5
0.1
0.5
ppm/mW
0.65
1.0
1.3
0.65
1.2
1.5
mA
mA
●
●
Minimum Shunt Current
(Note 8)
●
0.5
0.8
0.5
0.8
mA
Minimum Input/Output
Voltage Differential
IOUT ≤ 1mA
IOUT = 10mA
●
●
0.9
1.1
1.3
0.9
1.1
1.3
V
V
Trim Range
LT1019-2.5
LT1019-5
LT1019-10
Short-Circuit Current
Output Connected to GND
2V ≤ VIN ≤ 35V
Output Voltage Noise
(Note 10)
10Hz ≤ f ≤ 1kHz
0.1Hz ≤ f ≤ 10Hz
±3.5
±6
±3.5 5, – 13
±3.5 5, – 27
●
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 TMIN, 25°C and TMAX. The lowest of these three
readings is subtracted from the highest and the resultant difference is
divided by (TMAX – TMIN).
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 (VIN – VOUT) > 1V,
0mA ≤ ISINK ≤ 10mA. Shunt and sink current flow into the output.
4
MIN
15
10
25
50
2.5
2.5
4
±3.5
±3.5
±3.5
±6
5, – 13
5, – 27
15
10
25
50
mA
mA
2.5
2.5
4
ppm (RMS)
ppm (P-P)
%
%
%
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
VIN – VOUT.
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.
LT1019
U W
TYPICAL PERFOR A CE CHARACTERISTICS
Quiescent Current
(LT1019-4.5/LT1019-5)
Quiescent Current (LT1019-10)
1.6
1.6
1.6
1.4
1.4
1.4
1.2
1.2
125°C
0.8
25°C
–55°C
0.6
1.2
CURRENT (mA)
1.0
CURRENT (mA)
CURRENT (mA)
Quiescent Current (LT1019-2.5)
125°C
1.0
25°C
0.8
–55°C
0.6
0.4
0.2
0.2
0.2
5
10
15
20
25 30 35
INPUT VOLTAGE (V)
40
0
45
0
5
10
15
20
25 30 35
INPUT VOLTAGE (V)
LT1019 • TPC01
40
INPUT VOLTAGE/OUTPUT VOLTAGE (dB)
TJ = 25°C
OUTPUT CHANGE (mV)
TJ = –55°C
TJ = 25°C
2.5
LT1019-10
1.0
LT1019-4.5/LT1019-5
0.5
LT1019-2.5
0
–0.5
–1.0
–1.5
0
0
–2.0
–10 –8 –6 –4 –2 0 2 4 6 8
SINKING
SOURCING
OUTPUT CURENT (mA)
0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8
INPUT/OUTPUT VOLTAGE (V)
LT1019 • TPC04
1.0
100
70
60
50
10
0
0.6
0.5
0.4
0.3
4.0
LT1019 • TPC07
0.4
TJ = 125°C
TJ = 25°C
TJ = –55°C
0.1
0
0.5 1.0 1.5 2.0 2.5 3.0 3.5
OUTPUT-TO-GROUND VOLTAGE (V)
0.5
0.2
TJ = 25°C
TJ = –55°C
0.1
0.6
0.3
TJ = 125°C
0.2
TJ = –55°C
0
CURRENT (mA)
CURRENT (mA)
0.7
TJ = 25°C
1M
INPUT OPEN
0.9
0.8
0.1
100k
1.0
0.8
TJ = 125°C
1k
10k
FREQUENCY (Hz)
Shunt Mode Characteristics
(LT1019-10)
0.7
0.4
100
LT1019 • TPC06
INPUT OPEN
0.9
0.6
LT1019-4.5
LT1019-5
80
0.8
0.2
LT1019-2.5
90
0.7
0.3
LT1019-10
40
10
1.0
INPUT OPEN
45
40
TJ = 25°C
110
Shunt Mode Characteristics
(LT1019-5)
0.5
15 20 25 30 35
INPUT VOLTAGE (V)
LT1019 • TPC05
Shunt Mode Characteristics
(LT1019-2.5)
0.9
10
Ripple Rejection
1.5
TJ = 125°C
5
120
2.0
5.0
0
LT1019 • TPC03
Load Regulation
10
7.5
–55°C
LT1019 • TPC02
Minimum Input/Output Voltage
Differential
OUTPUT CURRENT (mA)
0
45
25°C
0.6
0.4
0
125°C
0.8
0.4
0
CURRENT (mA)
1.0
0
0
7
6
4
1
3
2
5
OUTPUT-TO-GROUND VOLTAGE (V)
8
LT1019 • TPC08
0
8
2
6
4
10 12 14
OUTPUT-TO-GROUND VOLTAGE (V)
16
LT1019 • TPC09
5
LT1019
U W
TYPICAL PERFOR A CE CHARACTERISTICS
Temp Pin Voltage
140
120
0.75
0.70
0.65
0.60
0.55
0.50
10
IOUT
TJ = 25°C
100
OUTPUT CAPACITOR (µF)
OUTPUT VOLTAGE CHANGE (µV)
0.90
0.85
0.80
VOLTAGE (V)
LT1019-2.5* Stability with
Output Capacitance
Line Regulation
80
60
LT1019-10
40
20
LT1019-2.5
LT1019-5
0
–10
1
REGION OF POSSIBLE
INSTABILITY
0.1
0.01
0.001
–20
0.45
0.40
50
25
0
75 100
–50 –25
JUNCTION TEMPERATURE (°C)
–30
0
125
5
10
15 20 25 30
INPUT VOLTAGE (V)
35
40
0.0001
20
LT1019 • TPC11
LT1019 • TPC10
0
10 15 20
15 10
5
5
SINK CURRENT
SOURCE CURRENT
OUTPUT CURRENT (mA)
1019 G12
*LT1019-4.5/LT1019-5/LT1019-10 ARE STABLE
WITH ALL LOAD CAPACITANCE.
W
BLOCK DIAGRA
R1
LT1019-2.5 = 11k
LT1019-4.5 = 13.9k
LT1019-5 = 16k
LT1019-10 = 37.1k
VIN
R3
80k
–
TRIM
R2
LT1019-4.5, LT1019-5,
LT1019-10 = 5k
LT1019-2.5 = 10k
1.188V
VOUT
+
GND
LT1019 • BD
U U
W
U
APPLICATIO S I FOR ATIO
Line and Load Regulation
Line regulation on the LT1019 is nearly perfect. A 10V
change in input voltage causes a typical output shift of less
than 5ppm. Load regulation (sourcing current) is nearly as
good. A 5mA change in load current shifts output voltage
by only 100µV. These are electrical effects, measured with
low duty cycle pulses to eliminate heating effects. In real
world applications, the thermal effects of load and line
changes must be considered.
6
Two separate thermal effects are evident in monolithic
circuits. One is a gradient effect, where power dissipation
on the die creates temperature gradients. These gradients
can cause output voltage shifts even if the overall temperature coefficient of the reference is zero. The LT1019, unlike
previous references, specifies thermal regulation caused
by die temperature gradients.The specification is
0.5ppm/mW. To calculate the effect on output voltage,
simply multiply the change in device power dissipation by
LT1019
U U
W
U
APPLICATIO S I FOR ATIO
the thermal regulation specification. Example: a 10V
device with a nominal input voltage of 15V and load
current of 5mA. Find the effect of an input voltage change
of 1V and a load current change of 2mA.
∆P (line change) = (∆VIN)(ILOAD) = (1V)(5mA) = 5mW
∆VOUT = (0.5ppm/mW)(5mW) = 2.5ppm
∆P (load change) = (∆ILOAD)(VIN – VOUT)
= (2mA)(5V) = 10mW
∆VOUT = (0.5ppm/mW)(10mW) = 5ppm
Even though these effects are small, they should be taken
into account in critical applications, especially where input
voltage or load current is high.
The second thermal effect is overall die temperature
change. The magnitude of this change is the product of
change in power dissipation times the thermal resistance
(θJA) of the IC package ≅ (100°C/W to 150°C/W). The
effect on the reference output is calculated by multiplying
die temperature change by the temperature drift specification of the reference. Example: same conditions as above
with θJA = 150°C/W and an LT1019 with 20ppm/°C drift
specification.
∆P (line change) = 5mW
∆VOUT = (5mW)(150°C/W)(20ppm/°C)
= 15ppm
∆P (load change) = 10mW
∆VOUT = (10mW)(150°C/W)(20ppm/°C)
= 30ppm
These calculations show that thermally induced output
voltage variations can easily exceed the electrical effects.
In critical applications where shifts in power dissipation
are expected, a small clip-on heat sink can significantly
improve these effects by reducing overall die temperature
change. Alternately, an LT1019A can be used with four
times lower TC. If warm-up drift is of concern, these
measures will also help. With warm-up drift, total device
power dissipation must be considered. In the example
given, warm-up drift (worst case) is equal to:
Warm-up drift = [(VIN)(IQ) + (VIN – VOUT)(ILOAD)]
[(θJA)(TC)]
with IQ (quiescent current) = 0.6mA,
Warm-up drift = [(15V)(0.6mA) + (5V)(5mA)]
[(150°C/W)(25ppm/°C)]
= 127.5ppm
Note that 74% of the warm-up drift is due to load current
times input/output differential. This emphasizes the
importance of keeping both these numbers low in critical
applications.
Note that line regulation is now affected by reference
output impedance. R1 should have a wattage rating high
enough to withstand full input voltage if output shorts
must be tolerated. Even with load currents below 10mA,
R1 can be used to reduce power dissipation in the LT1019
for lower warm-up drift, etc.
Output Trimming
Output voltage trimming on the LT1019 is nominally
accomplished with a potentiometer connected from output to ground with the wiper tied to the trim pin. The
LT1019 was made compatible with existing references, so
the trim range is large: + 6%, – 6% for the LT1019-2.5,
+ 5%, – 13% for the LT1019-5, and + 5%, – 27% for the
LT1019-10. 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 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.
7
LT1019
U U
W
U
APPLICATIO S I FOR ATIO
The worst-case error in initial output voltage for the
LT1019 is 0.2%, so a series resistor is satisfactory if the
output is simply trimmed to nominal value. The maximum
TC shift expected would be 1ppm/°C.
Using the Temp Pin
The LT1019 has a TEMP pin like several other bandgap
references. The voltage on this pin is directly proportional to absolute temperature (PTAT) with a slope of
approximately 2.1mV/°C. Room temperature voltage is
therefore approximately (295°K)(2.1mV/°C) = 620mV.
This voltage varies with process parameters and should
not be used to measure absolute temperature, but
rather relative temperature changes. Previous bandgap
references have been very sensitive to any loading on
the TEMP pin because it is an integral part of the
reference “core” itself. The LT1019 “taps” the core at a
special point which has much less effect on the reference. The relationship between TEMP pin loading and
a change in reference output voltage is less than
0.05%/µA, about ten times improvement over previous
references.
Output Bypassing
The LT1019 is designed to be stable with a wide range of
load currents and output capacitors. The 4.5V, 5V, and
10V devices do not oscillate under any combination of
capacitance and load. The 2.5V device can oscillate when
sinking currents between 1mA and 6mA for load capacitance between 400pF and 2µF (see Figure 1).
If output bypassing is desired to reduce high frequency
output impedance, keep in mind that loop phase margin is
significantly reduced for output capacitors between 500pF
and 1µF if the capacitor has low ESR (Effective Series
Resistance). This can make the output “ring” with tranVIN
VIN
LT1019
LT1019
2Ω TO 5Ω
+
2Ω TO 5Ω
+
2µF
TANTALUM
(a)
(b)
1019 F01
Figure 1. Output Bypassing
sient loads. The best transient load response is obtained
by deliberately adding a resistor to increase ESR as shown
in Figure 1.
Use configuration (a) if DC voltage error cannot be compromised as load current changes. Use (b) if absolute
minimum peak perturbation at the load is needed. For best
transient response, the output can be loaded with ≥ 1mA
DC current.
U
TYPICAL APPLICATIO S
Wide Range Trim ≥ ±5%
OUT
VIN
Narrow Trim Range (±0.2%)
VOUT
IN
R1
25k
VOUT
OUT
VIN
LT1019
TRIM
GND
IN
LT1019
TRIM
GND
R2*
1.5M
R1
100k
1019 TA03
*INCREASE TO 4.7M FOR LT1019A (±0.05%)
1019 TA05
8
2µF TO 10µF
TANTALUM
LT1019
U
TYPICAL APPLICATIO S
Trimming LT1019-10 Output to 10.240V
Trimming LT1019-5 Output to 5.120V
VOUT
VOUT
VIN
OUT
IN
LT1019-5
TRIM
GND
41.2k
1%
OUT
IN
LT1019-10
TRIM
GND
VIN
5k*
±1% TRIM
90.9k
1%
5k*
±1% TRIM
4.02k
1%
4.02k
1%
*LOW TC CERMET
*LOW TC CERMET
Negative Series Reference
Precision 1µA Current Source
15V
11.5k
1%
5k*
8.25k
1%
2.49M
1%
OUT
1019 TA06
1019 TA04
V+
IN
LT1019
R1*
LT1019-2.5
TRIM
GND
IN
D1*
OUT
GND
R2*
–
+
–VIN
VOUT
±11V COMPLIANCE
LT1012
Q1
2N2905
–VREF AT 50mA
+
V – – VREF
*R1 = V – 5V , R2 =
, D1 = VREF + 5V
1mA
2mA
1019 TA10
IOUT = 1µA
ZOUT ≥ 1011Ω
*LOW TC CERMET, TRIM RANGE = ±1.5%
1019 TA07
Output Current Boost with Current Limit
V + ≥ (VOUT + 2.8V)
LED
GLOWS IN
CURRENT LIMIT
(DO NOT OMIT)
R1
220Ω
8.2Ω
2N2905
IN
LT1019
OUT
GND
ILOAD ≤ 100mA
2µF SOLID TANTALUM
1019 TA08
9
10
R29
TRIM 80k
R3
R2
R1
Q1
R14
72k
Q3
5k
R8
2.5k
R7
1.6k
R6
780Ω
R4
SHORT
FOR
2.5
R9
3k
Q2
R5
Q4
R25
1k
R37
2k
R38
3.75k
Q38 Q36
R36
82k
Q37
R11B
1k
Q7
R11A
1.9k
R39
Q5
R42
4k
Q6A
R26
3k
R12
7.2k
Q8 Q9
R28
9k
1k
R13
24.5k
Q10
R15
3k
R18
2k
Q14
Q6B Q18
R27
9k
C4
Q11
Q16
R34
4k
Q32
Q12
Q17
Q15
Q20
C3
R16
Q35
3k
R17
500Ω
Q19
Q30
R24
850Ω
R35
27k
Q31
Q29
Q13
Q21
Q33
Q25
Q22
Q23
Q34
R20
750Ω
Q28
R23
100Ω
R31
22k
R33
1k
R32
500Ω
Q27
VOUT
GND
Q24
R19
15Ω
Q26
R21
20Ω
VIN
LT1019
W
W
SCHE ATIC DIAGRA
LT1019
U
PACKAGE DESCRIPTIO
Dimensions in inches (millimeters) unless otherwise noted.
H Package
8-Lead TO-5 Metal Can (0.200 PCD)
(LTC DWG # 05-08-1320)
0.335 – 0.370
(8.509 – 9.398)
DIA
0.305 – 0.335
(7.747 – 8.509)
0.027 – 0.045
(0.686 – 1.143)
45°TYP
PIN 1
0.028 – 0.034
(0.711 – 0.864)
0.040
(1.016)
MAX
0.050
(1.270)
MAX
SEATING
PLANE
0.200
(5.080)
TYP
0.165 – 0.185
(4.191 – 4.699)
GAUGE
PLANE
0.010 – 0.045*
(0.254 – 1.143)
REFERENCE
PLANE
0.500 – 0.750
(12.700 – 19.050)
0.110 – 0.160
(2.794 – 4.064)
INSULATING
STANDOFF
0.016 – 0.021**
(0.406 – 0.533)
*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)
H8(TO-5) 0.200 PCD 1197
N8 Package
8-Lead PDIP (Narrow 0.300)
(LTC DWG # 05-08-1510)
0.300 – 0.325
(7.620 – 8.255)
0.009 – 0.015
(0.229 – 0.381)
(
0.045 – 0.065
(1.143 – 1.651)
+0.889
–0.381
0.130 ± 0.005
(3.302 ± 0.127)
0.065
(1.651)
TYP
+0.035
0.325 –0.015
8.255
0.400*
(10.160)
MAX
)
8
7
6
5
1
2
3
4
0.255 ± 0.015*
(6.477 ± 0.381)
0.125
(3.175) 0.020
MIN (0.508)
MIN
0.018 ± 0.003
0.100
(2.54)
BSC
(0.457 ± 0.076)
N8 1098
*THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS.
MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.010 INCH (0.254mm)
S8 Package
8-Lead Plastic Small Outline (Narrow 0.150)
(LTC DWG # 05-08-1610)
0.189 – 0.197*
(4.801 – 5.004)
0.010 – 0.020
× 45°
(0.254 – 0.508)
0.008 – 0.010
(0.203 – 0.254)
0.053 – 0.069
(1.346 – 1.752)
0°– 8° TYP
0.016 – 0.050
(0.406 – 1.270)
0.014 – 0.019
(0.355 – 0.483)
TYP
*DIMENSION DOES NOT INCLUDE MOLD FLASH. MOLD FLASH
SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE
**DIMENSION DOES NOT INCLUDE INTERLEAD FLASH. INTERLEAD
FLASH SHALL NOT EXCEED 0.010" (0.254mm) PER SIDE
8
7
6
5
0.004 – 0.010
(0.101 – 0.254)
0.050
(1.270)
BSC
0.150 – 0.157**
(3.810 – 3.988)
0.228 – 0.244
(5.791 – 6.197)
1
2
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.
3
4
SO8 1298
11
LT1019
U
TYPICAL APPLICATION
Negative 10V Reference for CMOS DAC
OUT
59k
1%
LT1019-10
TRIM
GND
5k*
FB
30pF
5.76k
1%
LTC1595
IOUT
REF
+
1.2k
–15V
–
LT1007
VOUT
*LOW TC CERMET, TRIM RANGE = ±1.5%
1019 TA09
RELATED PARTS
PART NUMBER
DESCRIPTION
COMMENTS
LT1027
Precision 5V Reference
Lowest TC, High Accuracy, Low Noise, Zener Based
LT1236
Precision Reference
5V and 10V Zener Based, 5ppm/°C, SO-8 Package
LT1460
Micropower Precision Series Reference
Bandgap, 130µA Supply Current, 10ppm/°C, Available in SOT-23 Package
LT1634
Micropower Precision Shunt Reference
Bandgap 0.05%, 10ppm/°C, 10µA Supply Current
LTC1798
Micropower Low Dropout Reference
0.15% Max, 6.5µA Supply Current
LT1461
Micropower Low Dropout Reference
3ppm/°C, 0.04%, 50µA Supply Current
12
Linear Technology Corporation
1019fc LT/TP 1299 2K REV C • PRINTED IN USA
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408)432-1900 ● FAX: (408) 434-0507 ● www.linear-tech.com
 LINEAR TECHNOLOGY CORPORATION 1993