Datasheet

T
D
=
V
REF
x 'T
x 10
6
ppm
(V
REF_MAX
- V
REF_MIN
)
Temperature Range
Voltage
Temperature
V
REF_MAX
Change in Output Voltage
V
REF_MIN
V
HYS
=
lV
REF1
- V
REF2
l
V
REF
x 10
6
ppm
-40
o
C
V
REF1
Time
V
REF2
25
o
C
125
o
C
LM4132
SNVS372C –AUGUST 2005–REVISED APRIL 2013 www.ti.com
Figure 47. Illustrative Temperature Profile
This may be expressed analytically as the following:
Where
• V
HYS
= Thermal hysteresis expressed in ppm
• V
REF
= Nominal preset output voltage
• V
REF1
= V
REF
before temperature fluctuation
• V
REF2
= V
REF
after temperature fluctuation.
• The LM4132 features a low thermal hysteresis of 75 ppm (typical) from -40°C to 125°C after 8 temperature
cycles. (2)
TEMPERATURE COEFFICIENT
Temperature drift is defined as the maximum deviation in output voltage over the operating temperature range.
This deviation over temperature may be illustrated as shown in Figure 48.
Figure 48. Illustrative V
REF
vs Temperature Profile
Temperature coefficient may be expressed analytically as the following:
(3)
T
D
= Temperature drift
V
REF
= Nominal preset output voltage
V
REF_MIN
= Minimum output voltage over operating temperature range
V
REF_MAX
= Maximum output voltage over operating temperature range
ΔT = Operating temperature range.
The LM4132 features a low temperature drift of 10ppm (max) to 30ppm (max), depending on the grade.
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