6

LT1019

CC

HARA TERISTICS

A

TYPICALPERFOR

CE

JUNCTION TEMPERATURE (

°C)

–50

0.40

0.45

0.55

0.60

0.65

0.90

0.75

0

50

75

LT1019 • TPC10

0.50

0.80

0.85

0.70

–25

25

100

125

Temp Pin Voltage

INPUT VOLTAGE (V)

0

–30

–20

0

20

40

140

80

10

20

25

LT1019 • TPC11

–10

100

120

60

515

30

35

40

LT1019-2.5

LT1019-5

LT1019-10

Line Regulation

LT1019-2.5* Stability with

Output Capacitance

*LT1019-4.5/LT1019-5/LT1019-10 ARE STABLE

WITH ALL LOAD CAPACITANCE.

OUTPUT CURRENT (mA)

0.01

0.1

20

0

10

1019 G12

0.001

10

20

0.0001

1

10

15

5

5

15

SINK CURRENT

SOURCE CURRENT

REGION OF POSSIBLE

INSTABILITY

1.188V

GND

R2

LT1019-4.5, LT1019-5,

LT1019-10 = 5k

LT1019-2.5 = 10k

R3

80k

TRIM

LT1019-2.5 = 11k

LT1019-4.5 = 13.9k

LT1019-5 = 16k

LT1019-10 = 37.1k

R1

LT1019 • BD

BLOCK DIAGRA

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 100

µV. These areelectrical 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.

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