LT1460HCS3-2.5 LINER [Linear Technology], LT1460HCS3-2.5 Datasheet - Page 7

• Manufacturer Part Number: LT1460HCS3-2.5
• Description: Family of Micropower Series References in SOT-23
• Manufacturer: LINER [Linear Technology]

TYPICAL PERFORMANCE CHARACTERISTICS
LT1460S3s. Curves from the LT1460S3-2.5 and the LT1460-10 represent the extremes of the voltage options. Characteristic curves for
other output voltages fall between these curves, and can be estimated based on their voltage output.
Longer Battery Life
Series references have a large advantage over older shunt
style references. Shunt references require a resistor from
the power supply to operate. This resistor must be chosen
to supply the maximum current that can ever be
demanded by the circuit being regulated. When the circuit
being controlled is not operating at this maximum current,
the shunt reference must always sink this current, result-
ing in high dissipation and short battery life.
The LT1460S3 series references do not require a current
setting resistor and can operate with any supply voltage
from V
lated does not demand current, the LT1460S3s reduce
their dissipation and battery life is extended. If the refer-
ences are not delivering load current, they dissipate only
several mW, yet the same connection can deliver 20mA of
load current when demanded.
Capacitive Loads
The LT1460S3 family of references are designed to be
stable with a large range of capacitive loads. With no
APPLICATIONS
OUT
+ 0.9V to 20V. When the circuitry being regu-
0.1
U
10
1
0.01
10V Output Voltage
Noise Spectrum
INFORMATION
U
W
0.1
FREQUENCY (kHz)
U
W
1
10
U
1460S3 G10
100
capacitive load, these references are ideal for fast settling
or applications where PC board space is a premium. The
test circuit shown in Figure 1 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 R
Figure 2 shows the response of the reference to these 1mA
and 10mA load steps with no load capacitance, and Figure
3 shows a 1mA and 10mA load step with a 0.1 F output
capacitor. Figure 4 shows the response to a 1mA load step
with C
V
IN
= 2.5V
0.1 F
L
C
IN
= 1 F and 4.7 F.
10V Output Noise 0.1Hz to 10Hz
Characteristic curves are similar for most
Figure 1. Response Time Test Circuit
LT1460S3-2.5
TIME (2 SEC/DIV)
LT1460S3 (SOT-23)
V
OUT
1460S3 G22
L
C
L
= 100 or R
R
L
V
GEN
L
1460S3 F01
= 1k.
2.5V
1.5V
7