LT1461BIS8-2.5#TRPBF Linear Technology, LT1461BIS8-2.5#TRPBF Datasheet - Page 13
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LT1461BIS8-2.5#TRPBF
Manufacturer Part Number
LT1461BIS8-2.5#TRPBF
Description
IC REF LDO MICROPWR 2.5V 8SOIC
Manufacturer
Linear Technology
Datasheet
1.LT1461CIS8-5PBF.pdf
(16 pages)
Specifications of LT1461BIS8-2.5#TRPBF
Reference Type
Series
Voltage - Output
2.5V
Tolerance
±0.06%
Temperature Coefficient
7ppm/°C
Voltage - Input
3 ~ 20 V
Number Of Channels
1
Current - Quiescent
50µA
Current - Output
100mA
Operating Temperature
-40°C ~ 85°C
Mounting Type
Surface Mount
Package / Case
8-SOIC (3.9mm Width)
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Current - Cathode
-
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Part Number:
LT1461BIS8-2.5#TRPBFLT1461BIS8-2.5#PBF
Manufacturer:
LINEAR/凌特
Quantity:
20 000
APPLICATIO S I FOR ATIO
parts alone. What is more interesting are parts IR soldered
onto a PC board. If the PC board is then temperature cycled
several times from – 40 C to 85 C, the resulting hysteresis
curve is shown in Figure 8. This graph shows the influence
of the PC board stress on the reference.
When the LT1461 is soldered onto a PC board, the output
shifts due to thermal hysteresis. Figure 9 shows the effect
of soldering 40 pieces onto a PC board using standard IR
reflow techniques. The average output voltage shift is
–110ppm. Remeasurement of these parts after 12 days
shows the outputs typically shift back 45ppm toward their
initial value. This second shift is due to the relaxation of
stress incurred during soldering.
U
Figure 9. Typical Distribution of Output Voltage Shift After Soldering Onto PC Board
U
12
11
10
Figure 8. – 40 C to 85 C Hysteresis of 35 Parts Soldered Onto a PC Board
9
8
7
6
5
4
3
2
1
0
– 200
WORST-CASE HYSTERESIS
ON 35 UNITS
–160
W
–120
12
10
8
6
4
2
0
–300
– 80
U
–200
OUTPUT VOLTAGE SHIFT (ppm)
85 C TO 25 C
HYSTERESIS (ppm)
– 40
–100
0
0
The LT1461 is capable of dissipating high power, i.e., for
the LT1461-2.5, 17.5V • 50mA = 875mW. The SO-8
package has a thermal resistance of 190 C/W and this
dissipation causes a 166 C internal rise producing a
junction temperature of T
will actually occur is the thermal shutdown will limit the
junction temperature to around 150 C. This high tempera-
ture excursion will cause the output to shift due to thermal
hysteresis. Under these conditions, a typical output shift
is –135ppm, although this number can be higher. This
high dissipation can cause the 25 C output accuracy to
exceed its specified limit. For best accuracy and preci-
sion, the LT1461 junction temperature should not ex-
ceed 125 C.
100
40
200
80
1461 F09
300
120
– 40 C TO 25 C
160
1461 F08
J
= 25 C + 166 C = 191 C. What
200
LT1461
13