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LT1460EIN8-2.5-PBF Datasheet(PDF) 15 Page - Linear Technology

Part # LT1460EIN8-2.5-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

LT1460EIN8-2.5-PBF Datasheet(HTML) 15 Page - Linear Technology

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LT1460

1460fc
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
tosupplythemaximumcurrentthatcaneverbedemanded
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, resulting
in high dissipation and short battery life.
The LT1460 series reference does not require a current set-
ting resistor and can operate with any supply voltage from
VOUT +0.9Vto20V.Whenthecircuitrybeingregulateddoes
not demand current, the LT1460 reduces its dissipation and
battery life is extended. If the reference is not delivering load
current it dissipates only a few mW, yet the same configura-
tion can deliver 20mA of load current when demanded.
Capacitive Loads
The LT1460 is designed to be stable with capacitive loads.
With no capacitive load, the reference is ideal for fast set-
tling, applications where PC board space is a premium,
or where available capacitance is limited.
The test circuit for the LT1460-2.5 shown in Figure 1 is
used to measure the response time for various load cur-
rents and load capacitors. The 1V step from 2.5V to 1.5V
produces a current step of 1mA or 100µA for RL = 1k or
RL = 10k. Figure 2 shows the response of the reference
with no load capacitance.
The reference settles to 2.5mV (0.1%) in less than 1µs
for a 100µA pulse and to 0.1% in 1.5µs with a 1mA step.
When load capacitance is greater than 0.01µF, the refer-
ence begins to ring due to the pole formed with the output
impedance. Figure 3 shows the response of the reference
to a 1mA and 100µA load current step with a 0.01µF load
capacitor. The ringing can be greatly reduced with a DC
loadassmallas200µA.Withlargeoutputcapacitors,≥1µF,
Figure 5. Effect of RS for CL = 1µF
Figure 1. Response Time Test Circuit
Figure 2. CL = 0
Figure 3. CL = 0.01µF
Figure 4. Isolation Resistor Test Circuit
LT1460-2.5
RL
VOUT
VGEN
1460 F01
CIN
0.1µF
2.5V
1.5V
CL
VIN = 5V
LT1460-2.5
RL
VGEN
1460 F04
CIN
0.1µF
2.5V
1.5V
CL
VIN = 5V
VOUT
RS
1µs/DIV
2.5V
1.5V
RL = 10k
RL = 1k
1460 F02
VGEN
VOUT
VOUT
20µs/DIV
VGEN
VOUT
VOUT
2.5V
1.5V
RL = 10k
RL = 1k
1460 F03
0.1ms/DIV
2.5V
1.5V
RL = 1k
RS = 0
RL = 1k
RS = 2
1460 F05
VGEN
VOUT
VOUT
the ringing can be reduced with a small resistor in series
with the reference output as shown in Figure 4. Figure 5
shows the response of the LT1460-2.5 with a RS = 2Ω and
applications inForMation


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