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LT6656AIS6-2.5PBF Datasheet(PDF) 8 Page - Linear Technology

Part # LT6656AIS6-2.5PBF
Description  1關A Precision Series Voltage Reference
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LT6656AIS6-2.5PBF Datasheet(HTML) 8 Page - Linear Technology

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LT6656

6656f
IL = 0
VOUT
10mV/DIV
IL = 5µA
3.25V
VIN
2.75V
5ms/DIV
6656 F07
Output Settling
The output of the LT6656 is primarily designed to source
current, but is capable of sinking current to aid in output
transient recovery. The output stage uses a class B archi-
tecture to minimize quiescent current, and has a typical
crossover dead band of 6mV as the output transitions
from sourcing to sinking current, and twice the deadband
as the output transitions from sinking back to sourcing
current.
The settling time is typically less than 8ms for output loads
up to 5mA, however the time required to settle when the
load is turned off or in response to an input transient can
be significantly longer. Settling time is dominated by the
ability of the application circuit to discharge the output
capacitor. Larger load currents decrease settling time.
The settling time can be estimated by the following
equation:
Settling time
2(Deadband)(C )
I
+ 2ms
L
L
The graph in Figure 6 shows the settling time versus load
step with no load and with a constant 2µA load applied.
Note the settling time can be longer with load steps that
are not large enough to activate the sinking side of the
output stage.
The photo in Figure 7 shows the output response to a 0.5V
input step in both a no-load and 5µA load condition. In
the no-load condition only the bias current of the internal
bandgap reference (about 400nA) is available to discharge
the output capacitor.
applicaTions inForMaTion
Figure 5. Output Response to 0.5VP-P Step on VIN, CL = 1µF, IL = 0
Figure 7. Detailed Output Response to a 0.5V Input Step,
CIN = CL = 1µF
Output Noise
Ingeneral,outputnoiseintheLT6656isproportionaltothe
bandwidthoftheoutputstageandthereforeincreaseswith
higherloadcurrentandloweroutputcapacitance.However,
peaking in the noise response may be the dominant factor
in determining the output noise level. Noise peaking can
be reduced by increasing the size of the output capacitor
when driving heavier loads, or conversely, reducing the
size of the output capacitor when driving lighter loads.
Noise plots may be found in the Typical Performance
Characteristics section.
Internal Protection
The LT6656 incorporates several internal protection
features that make it ideal for use in battery powered
systems. Reverse input protection limits the input cur-
rent to typically less than 40µA when either the LT6656
2.7V
2.5V
VOUT
2.3V
3.25V
VIN
2.75V
5ms/DIV
6656 F05
Figure 6. Output Settling Time to 0.05% vs Load Step
LOAD STEP (mA)
6656 F06
0.001
1
10
0.1
0.01
VIN = 3V
CL = 1µF
∆IL = LOAD
STEP TO 2µA
∆IL = LOAD
STEP TO ZERO
∆IL = ZERO TO
LOAD STEP
30
25
20
15
10
5
0


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