LT1019AMH-4.5 Linear Technology, LT1019AMH-4.5 Datasheet - Page 6

• Manufacturer Part Number: LT1019AMH-4.5
• Description: Precision Reference
• Manufacturer: Linear Technology

APPLICATIO S I FOR ATIO
TYPICAL PERFOR
LT1019
BLOCK DIAGRA
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
0.70
0.90
0.85
0.80
0.75
0.65
0.60
0.55
0.50
0.45
0.40
–50
Temp Pin Voltage
–25
JUNCTION TEMPERATURE (°C)
0
25
U U
50
75
W
W
LT1019 • TPC10
100
LT1019-4.5, LT1019-5,
A
U
LT1019-2.5 = 10k
125
TRIM
LT1019-10 = 5k
CE
W
80k
C
R3
–10
–30
140
120
100
–20
HARA TERISTICS
R2
60
80
40
20
0
0
Line Regulation
LT1019-2.5
I
T
OUT
J
U
= 25°C
5
1.188V
C
10
INPUT VOLTAGE (V)
LT1019-2.5 = 11k
LT1019-4.5 = 13.9k
LT1019-5 = 16k
LT1019-10 = 37.1k
15
20
R1
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
–
+
25
LT1019-5
LT1019-10
V
IN
30
LT1019 • TPC11
35
40
LT1019 • BD
0.0001
0.001
0.01
V
GND
0.1
10
OUT
1
20
*LT1019-4.5/LT1019-5/LT1019-10 ARE STABLE
LT1019-2.5* Stability with
Output Capacitance
WITH ALL LOAD CAPACITANCE.
SINK CURRENT
15
10
OUTPUT CURRENT (mA)
5
0
REGION OF POSSIBLE
INSTABILITY
SOURCE CURRENT
5
10
15
1019 G12
1019fd
20