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LT1460EIS8-2.5-PBF Datasheet(PDF) 17 Page - Linear Technology

Part # LT1460EIS8-2.5-PBF
Description  Micropower Precision Series Reference Family
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LT1460EIS8-2.5-PBF Datasheet(HTML) 17 Page - Linear Technology

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LT1460

1460fc
Figure 13. CL = 0µF
Figure 14. CL = 0.1µF
Figure 15. IOUT = 1mA
Figure 12. Response Time Test Circuit
The LT1460S3 family of references are designed to be
stable with a large range of capacitive loads. With no
capacitive load, these references are ideal for fast settling
or applications where PC board space is a premium. The
test circuit shown in Figure 12 is used to measure the
response time and stability of various load currents and
load capacitors. This circuit is set for the 2.5V option. For
other voltage options, the input voltage must be scaled
up and the output voltage generator offset voltage must
be adjusted. The 1V step from 2.5V to 1.5V produces a
current step of 10mA or 1mA for RL = 100Ω or RL = 1k.
Figure 13 shows the response of the reference to these
applications inForMation
LT1460S3-2.5
RL
VOUT
VGEN
1460 F12
CIN
0.1µF
2.5V
1.5V
CL
VIN = 2.5V
1µs/DIV
10mA
1mA
1.5V
2.5V
1460 F13
VGEN
VOUT
VOUT
100µs/DIV
10mA
1mA
1.5V
2.5V
1460 F14
VGEN
VOUT
VOUT
100µs/DIV
4.7µA
1µA
1.5V
2.5V
1460 F15
VGEN
VOUT
VOUT
1mA and 10mA load steps with no load capacitance, and
Figure 14 shows a 1mA and 10mA load step with a 0.1µF
output capacitor. Figure 15 shows the response to a 1mA
load step with CL = 1µF and 4.7µF.
The frequency compensation of the LT1460S3 version is
slightlydifferentthanthatoftheotherpackages.Additional
care must be taken when choosing load capacitance in an
application circuit.
Table 1 gives the maximum output capacitance for vari-
ous load currents and output voltages of the LT1460S3 to
avoid instability. Load capacitors with low ESR (effective
series resistance) cause more ringing than capacitors
with higher ESR such as polarized aluminum or tantalum
capacitors.


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