LT1461AIS8-3 Linear Technology, LT1461AIS8-3 Datasheet - Page 9

• Manufacturer Part Number: LT1461AIS8-3
• Description: IC MICRPWR PREC REF LDO 3V 8SOIC
• Manufacturer: Linear Technology

Specifications of LT1461AIS8-3

• Reference Type: Series
• Voltage - Output: 3V
• Tolerance: ±0.04%
• Temperature Coefficient: 3ppm/°C
• Voltage - Input: 3.5 ~ 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: Contains lead / RoHS non-compliant
• Current - Cathode: -

APPLICATIO S I FOR ATIO
TYPICAL PERFOR A CE CHARACTERISTICS
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.
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
1mA/DIV
I
20mV/DIV
OUT
V
0mA
1mA
OUT
Figure 1. 1mA Load Step with C
U
–50
250
200
150
100
U
50
0
W
0
Long-Term Drift (Number of Data Points Reduced at 650 Hours)*
*SEE APPLICATIONS INFORMATION FOR DETAILED EXPLANATION OF LONG-TERM DRIFT
LT1461S8
3 TYPICAL PARTS SOLDERED ONTO PCB
T
A
= 30 C
U
200
W
L
400
= 1 F
1461 F01
600
U
800
HOURS
1000
should be sufficient. The output capacitor acts as fre-
quency compensation for the reference and cannot be
omitted. For light loads 1mA, a 1 F nonpolar output
capacitor is usually adequate, but for higher loads (up to
75mA), the output capacitor should be 2 F or greater.
Figures 1 and 2 show the transient response to a 1mA
load step with a 1 F output capacitor and a 50mA load
step with a 2 F output capacitor.
1200
200mV/DIV
50mA/DIV
V
I
OUT
OUT
1400
Characteristic curves are similar for most LT1461s.
Figure 2. 50mA Load Step with C
1600
1800
1461 G15
2000
L
= 2 F
1461 F02
LT1461
9