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61CI25 View Datasheet(PDF) - Linear Technology

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61CI25 Datasheet PDF : 16 Pages
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LT1461
TYPICAL PERFOR A CE CHARACTERISTICS Characteristic curves are similar for most LT1461s.
Curves from the LT1461-2.5 and the LT1461-5 represent the extremes of the voltage options. Characteristic curves for other output
voltages fall between these curves and can be estimated based on their output.
Long-Term Drift (Number of Data Points Reduced at 650 Hours)*
250
LT1461S8
3 TYPICAL PARTS SOLDERED ONTO PCB
200 TA = 30°C
150
100
50
0
–50
0
200 400 600 800 1000 1200 1400 1600 1800 2000
HOURS
1461 G15
*SEE APPLICATIONS INFORMATION FOR DETAILED EXPLANATION OF LONG-TERM DRIFT
APPLICATIO S I FOR ATIO
Examples shown in this Applications section use the
LT1461-2.5. The response of other voltage options can
be estimated by proper scaling.
Bypass and Load Capacitors
The LT1461 family requires a capacitor on the input and
on the output for stability. The capacitor on the input is a
supply bypass capacitor and if the bypass capacitors
from other components are close (within 2 inches) they
should be sufficient. The output capacitor acts as fre-
quency compensation for the reference and cannot be
omitted. For light loads 1mA, a 1µF nonpolar output
capacitor is usually adequate, but for higher loads (up to
75mA), the output capacitor should be 2µF or greater.
Figures 1 and 2 show the transient response to a 1mA
load step with a 1µF output capacitor and a 50mA load
step with a 2µF output capacitor.
IOUT 0mA
1mA/DIV 1mA
VOUT
20mV/DIV
1461 F01
Figure 1. 1mA Load Step with CL = 1µF
IOUT
50mA/DIV
VOUT
200mV/DIV
1461 F02
Figure 2. 50mA Load Step with CL = 2µF
9
 

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