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LT1019ACS8-2.5 View Datasheet(PDF) - Linear Technology

Part NameLT1019ACS8-2.5 Linear
Linear Technology Linear
DescriptionPrecision Reference
LT1019ACS8-2.5 Datasheet PDF : 12 Pages
1 2 3 4 5 6 7 8 9 10 Next Last
LT1019
TYPICAL PERFOR A CE CHARACTERISTICS
Temp Pin Voltage
0.90
0.85
0.80
0.75
0.70
0.65
0.60
0.55
0.50
0.45
0.40
–50 –25 0 25 50 75 100 125
JUNCTION TEMPERATURE (°C)
LT1019 • TPC10
Line Regulation
140
120
IOUT
TJ = 25°C
100
80
60
40
LT1019-10
20
LT1019-2.5
0
LT1019-5
– 10
– 20
– 30
0 5 10 15 20 25 30 35 40
INPUT VOLTAGE (V)
LT1019 • TPC11
LT1019-2.5* Stability with
Output Capacitance
10
1
REGION OF POSSIBLE
0.1
INSTABILITY
0.01
0.001
0.0001
20
15 10 5 0 5 10 15 20
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
R3
80k
TRIM
R2
LT1019-4.5, LT1019-5,
LT1019-10 = 5k
LT1019-2.5 = 10k
R1
LT1019-2.5 = 11k
LT1019-4.5 = 13.9k
LT1019-5 = 16k
LT1019-10 = 37.1k
1.188V
VIN
+
VOUT
GND
LT1019 • BD
UU 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 tempera-
ture 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
1019fd
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