LT6656AIS6-2.5PBF [Linear]
1μA Precision Series Voltage Reference; 1μA精准串联电压基准
| 型号： | LT6656AIS6-2.5PBF |
| 厂家： | 
Linear |
| 描述： | 1μA Precision Series Voltage Reference |
| 文件： | 总12页 (文件大小：503K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
LT6656
1µA Precision Series
Voltage Reference
FeaTures
DescripTion
The LT®6656 is a small precision voltage reference that
draws less than 1µA of supply current and can operate
with a supply voltage within 10mV of the output voltage.
The LT6656 offers an initial accuracy of 0.05% and tem-
perature drift of 10ppm/°C. The combined low power and
precision characteristics are ideal for portable and battery
powered instrumentation.
n
Low Drift
A Grade: 10 ppm/°C Max
B Grade: 20 ppm/°C Max
High Accuracy
n
A Grade: 0.05% Max
B Grade: 0.1% Max
n
n
n
n
n
n
n
n
Ultralow Supply Current: 850nA
High Output Drive Current: 5mA Min
Low Dropout Voltage: 10mV Max
Fully Specified from –40°C to 85°C
Operational from –55°C to 125°C
Wide Supply Range to 18V
Reverse Input/Output Protection
Available Output Voltage Options: 2.5V
For 1.25V, 2.048V, 3V, 3.3V, 4.096V and 5V Options,
Consult LTC Marketing
The LT6656 can supply up to 5mA of output drive with
65ppm/mA of load regulation, allowing it to be used as
the supply voltage and the reference input to a low power
ADC. The LT6656 can accept a supply voltage up to 18V
and withstand the reversal of the input connections.
The LT6656 output is stable with 1µF or larger output ca-
pacitanceandoperateswithawiderangeofoutputcapacitor
ESR, ensuring that the LT6656 is simple to use.
n
n
Thermal Hysteresis: 25ppm
Low Profile (1mm) ThinSOT™ Package
This reference is fully specified for operation from –40°C
to 85°C, and is functional over the extreme temperature
range of –55°C to 125°C. Low hysteresis and a consistent
temperature drift are obtained through advanced design,
processing and packaging techniques.
applicaTions
n
Precision A/D and D/A Converters
n
The LT6656 is offered in the 6-lead SOT-23 package.
L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation. ThinSOT is
a trademark of Linear Technology Corporation. All other trademarks are the property of their
respective owners.
Portable Gas Monitors
n
Battery- or Solar-Powered Systems
n
Precision Regulators
n
Low Voltage Signal Processing
n
Micropower Remote Sensing
Typical applicaTion
Output Voltage Temperature Drift
2.503
38 TYPICAL UNITS
Basic Connection
2.502
2.501
2.500
2.499
2.498
V
OUT
LT6656-2.5
2.510V b V b 18V
IN
2.5V
0.1MF
1MF
6656 TA01a
–40 –20
0
20
40
60
80
TEMPERATURE (°C)
6652 TA01b
6656f
ꢀ
LT6656
absoluTe MaxiMuM raTings
pin conFiguraTion
(Note 1)
TOP VIEW
Input Voltage.............................................................20V
Output Voltage........................................... –0.3V to 20V
Output Voltage Above Input Voltage ....................... 20V
Specified Temperature Range
GND* 1
GND 2
NC 3
6 V
OUT
5 NC
4 V
IN
S6 PACKAGE
6-LEAD PLASTIC TSOT-23
= 150°C, θ = 230°C/W
Commercial ............................................. 0°C to 70°C
Industrial .............................................–40°C to 85°C
Operating Temperature Range ............... –55°C to 125°C
Output Short Circuit Duration ......................... Indefinite
Junction Temperature .......................................... 150°C
Storage Temperature Range (Note 2)..... –65°C to 150°C
Lead Temperature (Soldering, 10 sec.)
T
JMAX
JA
*CONNECT PIN TO DEVICE GND (PIN 2)
(Note 3).................................................................300°C
orDer inForMaTion
LEAD FREE FINISH
LT6656ACS6-2.5#PBF
LT6656BCS6-2.5#PBF
LT6656AIS6-2.5#PBF
LT6656BIS6-2.5#PBF
TAPE AND REEL
PART MARKING*
PACKAGE DESCRIPTION
SPECIFIED TEMPERATURE RANGE
LT6656ACS6-2.5#TRPBF LTFGW
LT6656BCS6-2.5#TRPBF LTFGW
6-Lead Plastic TSOT-23
6-Lead Plastic TSOT-23
6-Lead Plastic TSOT-23
6-Lead Plastic TSOT-23
0°C to 70°C
0°C to 70°C
LT6656AIS6-2.5#TRPBF
LT6656BIS6-2.5#TRPBF
LTFGW
LTFGW
–40°C to 85°C
–40°C to 85°C
Consult LTC Marketing for parts specified with wider operating temperature ranges.
*The temperature and performance grades are identified by a label on the shipping container.
Consult LTC Marketing for information on non-standard lead based finish parts.
For more information on lead free part marking, go to: http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/
available opTions
SPECIFIED TEMPERATURE RANGE
0°C to 70°C
–40°C to 85°C
TEMPERATURE
COEFFICIENT
OUTPUT VOLTAGE
INITIAL ACCURACY
ORDER PART NUMBER**
ORDER PART NUMBER**
2.5V
0.05%
0.1%
10ppm/°C
20ppm/°C
LT6656ACS6-2.5
LT6656BCS6-2.5
LT6656AIS6-2.5
LT6656BIS6-2.5
**See Order Information section for complete part number listing.
6656f
ꢁ
LT6656
elecTrical characTerisTics The l denotes the specifications which apply over the specified
temperature range, otherwise specifications are at TA = 25°C. VIN = VOUT + 500mV, CL = 1µF, IL = 0, unless otherwise noted. (Note 9)
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Output Voltage Error
LT6656A
LT6656B
–0.05
–0.10
0.05
0.10
%
%
l
l
Output Voltage Temperature Coefficient (Note 4)
Line Regulation
LT6656A
LT6656B
5
10
20
ppm/°C
ppm/°C
12
V
IN
= (V
+ 0.5V) to 18V
2
25
40
ppm/V
ppm/V
OUT
l
l
Load Regulation (Note 5)
I
= 5mA
65
150
375
ppm/mA
ppm/mA
SOURCE
Dropout Voltage (Note 6)
V
Error ≤ 0.1%
SOURCE
OUT
I
= 0µA
3
10
40
500
mV
mV
mV
l
l
I
= 5mA
SOURCE
Supply Current
0.85
1.0
1.5
µA
µA
l
Output Short Circuit Current
Sourcing, Short V
to GND
18
4
mA
mA
OUT
Sinking, Short V
to V
IN
OUT
Input Reverse Leakage Current
Reverse Output Current
V
IN
V
IN
= -18V, V
= GND
= 18V
35
30
µA
µA
OUT
= GND, V
OUT
Output Voltage Noise (Note 7)
0.1Hz to 10Hz
10Hz to 1kHz
60
80
µV
P-P
RMS
µV
Turn-On Time
0.1% Settling
25
50
ms
Long Term Drift of Output Voltage (Note 8)
Hysteresis (Note 9)
ppm/√kHr
∆T = 0°C to 70°C
∆T = –40°C to 85°C
25
70
ppm
ppm
Note 1: Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2: If the parts are stored outside of the specified temperature range,
the output may shift due to hysteresis.
Note 3: The stated temperature is typical for soldering of the leads during
manual rework. For detailed IR reflow recommendations, refer to the
Applications section.
environment to eliminate thermocouple effects on the leads. The test
time is 10 seconds. RMS noise is measured on a spectrum analyzer in a
shielded environment.
Note 8: Long term stability typically has a logarithmic characteristic and
therefore, changes after 1000 hours tend to be much smaller than before
that time. Total drift in the second thousand hours is normally less than
one third that of the first thousand hours with a continuing trend toward
reduced drift with time. Long-term stability will also be affected by
differential stresses between the IC and the board material created during
board assembly.
Note 4: Temperature coefficient is measured by dividing the maximum
Note 9: Hysteresis in output voltage is created by mechanical stress
that differs depending on whether the IC was previously at a higher or
lower temperature. Output voltage is always measured at 25°C, but
the IC is cycled to the hot or cold temperature limit before successive
measurements. For instruments that are stored at well controlled
temperatures (within 20 or 30 degrees of operational temperature)
hysteresis is usually not a dominant error source.
change in output voltage by the specified temperature range.
Note 5: Load regulation is measured with a pulse from no load to the
specified load current. Output changes due to die temperature change
must be taken into account separately.
Note 6: Excludes load regulation errors.
Note 7: Peak-to-peak noise is measured with a 3-pole highpass filter at
0.1Hz and a 4-pole lowpass filter at 10Hz. The unit is enclosed in a still-air
6656f
ꢂ
LT6656
Typical perForMance characTerisTics
Output Voltage Temperature Drift
Typical VOUT Distribution
Supply Current vs Input Voltage
100
10
1
200
180
160
140
120
100
80
2.514
2.512
2.510
2.508
2.506
2.504
2.502
2.500
2.498
2.496
T
T
T
T
= 125°C
38 TYPICAL UNITS
V
C
I
= 3V
IN
A
A
A
A
= 85°C
= 25°C
= –40°C
V
C
I
= 3V
= 1µF
IN
L
L
L
L
= 1µF
= 0
= 0
T
= 25°C
A
SPECIFIED TEMPERATURE RANGES
INDUSTRIAL
COMMERCIAL
60
40
20
0.1
0
0
2
4
6
8
10 12 14 16 18 20
2.4975 2.4985 2.4995 2.5005 2.5015
OUTPUT VOLTAGE (V)
–60 –40 –20
0
20 40 60 80 100 120
INPUT VOLTAGE (V)
TEMPERATURE (°C)
6652 G01
6656 G03
6656 G02
Dropout Voltage
Load Regulation(Sourcing)
Load Regulation (Sinking)
1000
100
10
1000
750
500
250
0
2.0
1.5
1.0
0.5
0
V
V
= 3V
V
C
= 3V
T
T
T
T
= 85°C, 125°C
= 25°C
IN
IN
IN
A
A
A
A
= V
= 1µF
L
OUT
∆V
= 0.1%
= 0°C
OUT
= –40°C
T
T
T
T
= 125°C
T
T
T
T
= 125°C
= 85°C
= 25°C
= –40°C
A
A
A
A
A
A
A
A
= 85°C
= 25°C
= –40°C
–250
–500
V
C
= 3V
IN
L
= 1µF
1
–0.5
0.1µ
1µ
10µ
100µ
1m
10m
0.1µ
1µ
10µ
100µ
1m
10m
10µ
100µ
1m
LOAD CURRENT (A)
LOAD CURRENT (A)
LOAD CURRENT (A)
6656 G04
6656 G05
6656 G06
Power Supply Rejection Ratio vs
Frequency
Ground Current vs Load Current
Line Regulation
1000
100
10
2.507
2.506
2.505
2.504
2.503
2.502
2.501
2.500
2.499
2.498
90
80
70
60
50
40
30
20
10
0
V
C
= 3V
I
= 0
L
V
C
L
= 3V
IN
IN
L
L
= 1µF
C
= 1µF
= 1µF
L
= 0
I
T
T
T
T
= 125°C
= 85°C
= 25°C
= –40°C
A
A
A
A
T
T
T
T
= 125°C
A
A
A
A
= 85°C
= 25°C
= –40°C
1
10µ
100µ
1m
10m
0
2
4
6
8
10 12 14 16 18 20
10
100
1k
10k
LOAD CURRENT (A)
INPUT VOLTAGE (V)
FREQUENCY (Hz)
6656 G07
6656 G08
6656 G09
6656f
ꢃ
LT6656
Typical perForMance characTerisTics
Reverse Output Current
Output Impedance vs Frequency
Reverse Input Current
1k
100
10
100
10
1
100
10
1
V
C
= 3V
V
= GND
V
IN
= GND
IN
L
OUT
= 1µF
I
= 0
L
I
L
= 10µA
I
L
= 100µA
T
T
T
T
= 125°C
= 85°C
= 25°C
= –40°C
T
T
T
T
= 125°C
= 85°C
= 25°C
= –40°C
A
A
A
A
A
A
A
A
0
10
100
1k
10k
0
–2 –4 –6 –8 –10 –12 –14 –16 –18 –20
0
5
10
15
20
FREQUENCY (Hz)
INPUT VOLTAGE (V)
OUTPUT VOLTAGE (V)
6656 G10
6656 G11
6656 G12
Output Voltage Noise Spectrum
vs Load Current
Output Noise 0.1Hz to 10Hz
16
14
12
10
8
V
C
I
= 3V
V
C
= 3V
= 1µF
I
I
I
I
= 0
S
L
S
L
L
L
L
L
= 1µF
= 10µA
= 250µA
= 1mA
= 0
L
6
4
2
0
10
100
1k
10k
TIME (1s/DIV)
6656 G13
FREQUENCY (Hz)
6656 G14
Output Noise Voltage Spectrum
vs Load Capacitance
Long-Term Drift
40
35
30
25
20
15
10
5
200
150
100
50
V
L
= 3V
V
C
= 3V
IN
IN
I
= 0
= 1µF
L
C
L
= 47µF
I = 0
L
0
C
L
= 4.7µF
C
–50
–100
–150
–200
= 0.47µF
L
5 TYPICAL PARTS
SOLDERED ONTO PCB
0
1
10
100
1k
0
100 200 300 400 500 600 700 800 900 1000
FREQUENCY (Hz)
HOURS
6656 G15
6656 G16
6656f
ꢄ
LT6656
pin FuncTions
GND* (Pin 1): Internal Function. This pin must be tied
to ground.
specification in the Electrical Characteristics table. The
maximum input voltage is 18V. Bypass V with a 0.1µF
IN
capacitor to ground.
GND (Pin 2): Device Ground.
NC (Pin 5): Not internally connected. May be tied to V ,
IN
NC (Pin 3): Not internally connected. May be tied to V ,
IN
V , GND or floated.
OUT
V , GND or floated.
OUT
V
(Pin6):OutputVoltage.Aminimumoutputcapacitor
OUT
V (Pin4):PowerSupply.Theminimumsupplyvarieswith
IN
of 1µF is required for stable operation.
output load and voltage option, see the Dropout Voltage
block DiagraM
4
V
IN
5
6
NC
V
OUT
ERROR
AMP
BANDGAP
3
NC
GND
GND
1
2
6656 BD
6656f
ꢅ
LT6656
applicaTions inForMaTion
Long Battery Life
The output of the device requires a capacitance of 1µF or
larger. With its low sensitivity to ESR, the LT6656 is stable
with a wide variety of capacitor types including ceramic,
tantalum and electrolytic. The test circuit in Figure 2 was
used to test the response and stability of the LT6656 to
various load currents. The resultant transient responses
can be seen in Figure 3 and Figure 4. The large scale out-
put response to a 500mV input step is shown in Figure 5
with a more detailed photo and description in the Output
Settling section.
Series references have a large advantage over 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 be demanded by
the load. When the load is not operating at this maximum
current, theshuntreferencemustalwayssinkthiscurrent,
resulting in high dissipation and shortened battery life.
The LT6656 series reference does not require a current
setting resistor and is specified to operate with any sup-
ply from V
+ 10mV to 18V, depending on the load
OUT
R2
4
6
V
IN
LT6656-2.5
1, 2
current and operating temperature (see Dropout Voltage
in the Typical Performance Characteristics). When the
load does not demand current, the LT6656 reduces its
dissipation and battery life is extended. If the reference
is not delivering load current, it dissipates only a few µW,
yet the same connection can deliver 5mA of load current
when required.
3V
V
GEN
3V
C
IN
C
L
1µF
R1
0.1µF
2N7000
6656 F02
Figure 2. Transient Load Test Circuit
0µA
I
Start-Up
OUT
100µA
To ensure proper start-up, the output voltage should be
between –0.3V and 2.5V. If the output load may be driven
more than 0.3V below ground, a low forward voltage
schottky diode from the output to ground is required. The
turn-on characteristics can be seen in Figure 1.
2.52V
2.50V
2.48V
V
OUT
Bypass and Load Capacitance
6656 F03
5ms/DIV
The LT6656 voltage reference needs an input bypass
capacitor of 0.1µF or larger, however, the bypassing of
other local devices may serve as the required component.
Figure 3. Transient Response, 0µA to 100µA Load Step
(R2 = 24.9k, R1 = Open)
1mA
I
OUT
2mA
V
IN
1V/DIV
2.52V
2.50V
2.48V
V
OUT
V
OUT
6656 F04
6656 F01
5ms/DIV
1ms/DIV
Figure 1. Turn-On Characteristics, CL = 1µF
Figure 4. Transient Response, 1mA to 2mA Load Step
(R1 = R2 = 2.49k)
6656f
ꢆ
LT6656
applicaTions inForMaTion
30
25
20
15
10
5
V
C
= 3V
IN
L
= 1µF
3.25V
V
IN
∆I = LOAD
L
STEP TO ZERO
2.75V
2.7V
2.5V
2.3V
∆I = LOAD
L
STEP TO 2µA
V
OUT
∆I = ZERO TO
L
6656 F05
LOAD STEP
5ms/DIV
0
0.001
0.01
0.1
LOAD STEP (mA)
1
10
Figure 5. Output Response to 0.5VP-P Step on VIN, CL = 1µF, IL = 0
6656 F06
Output Settling
Figure 6. Output Settling Time to 0.05% vs Load Step
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.
3.25V
V
IN
2.75V
I
L
= 0
V
OUT
10mV/DIV
I
= 5µA
L
Thesettlingtimeistypicallylessthan8msforoutputloads
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.
6656 F07
5ms/DIV
Figure 7. Detailed Output Response to a 0.5V Input Step,
IN = CL = 1µF
C
Output Noise
The settling time can be estimated by the following
equation:
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.
2(Deadband)(CL)
Settling time ≈
+ 2ms
IL
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
bandgapreference(about400nA)isavailabletodischarge
the output capacitor.
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
6656f
ꢇ
LT6656
applicaTions inForMaTion
30
25
20
15
10
5
or the battery is installed backwards. In systems where
the output can be held up by a backup battery with the
input pulled to ground, the reverse output protection of
the LT6656 limits the output current to typically less than
30µA. Should the output be pulled above the input when
the LT6656 is biased, the output will typically sink 4mA.
The current versus reverse voltage is shown in the Typical
Performance Characteristics section.
V
C
I
= 3V
0°C TO 25°C
70°C TO 25°C
IN
L
L
= 1µF
= 0
Long-Term Drift
0
–60 –40 –20
0
20
40
60
Long-term drift cannot be extrapolated from accelerated
high temperature testing. This erroneous technique gives
drift numbers that are wildly optimistic. A more realistic
way to determine long-term drift is to measure it over the
time interval of interest. The LT6656 drift data was taken
over 100 parts that were soldered into PC boards similar
to a real world application. The boards were then placed
HYSTERESIS (ppm)
6656 F08
Figure 8. 0°C to 70°C Hysteresis
20
18
16
14
12
10
8
–40°C TO 25°C
85°C TO 25°C
V
C
L
= 3V
IN
= 1µF
L
I
= 0
into a constant temperature oven with T = 30°C, their
A
outputs scanned regularly and measured with an 8.5 digit
DVM. The parts chosen in the Long Term Drift curves in
theTypicalPerformanceCharacteristicssectionrepresent
high, low and typical units.
6
4
2
Hysteresis
0
–160 –120 –80 –40
0
40 80 120 160
HYSTERESIS (ppm)
Hysteresis on the LT6656 is measured in two steps, for
example, from 25°C to –40°C to 25°C, then from 25°C to
85°C to 25°C, for the industrial temperature range. This
two-stepcycleisrepeatedseveraltimesandthemaximum
hysteresis from all the partial cycles is noted. Unlike other
commonly used methods for specifying hysteresis, this
ensures the worst-case hysteresis is included, whether it
occurs in the first temperature excursion or the last.
6656 F09
Figure 9. –40°C to 85°C Hysteresis
IR Reflow Shift
The different expansion and contraction rates of the
materials that make up the LT6656 package induce small
stressesonthediethatcancausetheoutputtoshiftduring
IR reflow. Common lead free IR reflow profiles reach over
250°C, considerably more than lead solder profiles. The
higherreflowtemperatureoftheleadfreepartsexacerbates
the issue of thermal expansion and contraction causing
the output shift to generally be greater than with a leaded
reflow process.
Results over both commercial and industrial temperature
ranges are shown in Figure 8 and Figure 9. As expected,
the parts cycled over the higher temperature range have
a higher hysteresis than those cycled over the lower
range.
Power Dissipation
The lead free IR reflow profile used to experimentally
measure the output voltage shift in the LT6656-2.5 is
shown in Figure 10. Similar results can be expected using
a convection reflow oven. Figure 11 shows the change
in output voltage that was measured for parts that were
The LT6656 will not exceed the maximum junction tem-
perature when operating within its specified temperature
range of –40°C to 85°C, maximum input voltage of 18V
and specified load current of 5mA.
6656f
ꢈ
LT6656
applicaTions inForMaTion
300
run through the reflow process for 1 cycle and also 3
cycles. The results indicate that the standard deviation
of the output voltage increases with a positive mean shift
of 120ppm. While there can be up to 220ppm of output
voltage shift, additional drift of the LT6656 after IR reflow
does not vary significantly.
380s
T
P
= 260°C
RAMP
DOWN
T
L
= 217°C
225
150
75
T
= 200°C
S(MAX)
= 190°C
t
T
P
S
30s
T = 150°C
t
L
RAMP TO
150°C
130s
40s
PC Board Layout
120s
4
0
The mechanical stress of soldering a surface mount volt-
age reference to a PC board can cause the output voltage
to shift and temperature coefficient to change.
0
2
6
8
10
MINUTES
6656 F10
Figure 10. Lead Free Reflow Profile Due to IR Reflow
To reduce the effects of stress-related shifts, position
the reference near the short edge of the PC board or in a
corner. In addition, slots can be cut into the board on two
sides of the device. See Application Note AN82 for more
information. http://www.linear.com
7
V
C
I
= 3V
3 CYCLES
1 CYCLE
IN
= 1µF
L
L
6
5
4
3
2
1
0
= 0
The input and output capacitors should be mounted close
to the package. The GND and V
traces should be as
OUT
short as possible to minimize the voltage drops caused
by load and ground currents. Excessive trace resistance
directly impacts load regulation.
0
20
60
100
140
180
220
CHANGE IN OUTPUT VOLTAGE (ppm)
6656 F11
Figure 11. Output Voltage Shift Due to IR Reflow,
Peak Temperature = 260°C
Typical applicaTions
Regulator Reference
be a good match with a small, low power microcontroller.
Using the LT6656 as a regulator reduces power consump-
tion, decreases solution size and increases the accuracy
of the microcontroller’s on board ADC.
The robust input and output of the LT6656 along with its
high output current make it an excellent precision low
power regulator as well as a reference. The LT6656 would
Microcontroller Reference and Regulator
IN
OUT
3V TO 18V
LT6656
MCU
C12
10µF
C13
0.1µF
V
/V
CC REF
5
6
7
2
3
1
PB0/AIN0/A /MOSI
REF
PB1/INT0/A /MISO/OC1A
IN1
PB2/ADC1/SCK/T0/INT0
PB3/ADC2
PB4/ADC3
PB5/RESET/ADC0
GND
6656 TA02
6656f
ꢀ0
LT6656
Typical applicaTions
Extended Supply Range Reference
Boosted Output Current Reference
V
3.6V TO 18V
IN
+
UP TO 160V
R5
2207
10µF
R3
R4
330k
4.7k
Q2
Q3
2N2905
MMBT5551
V
OUT
LT6656
40mA MAX
D1
C4
0.1µF
C5
1µF
V
BZX584C12
LT6656
OUT
C3
1µF
6656 TA03
6656 TA04
package DescripTion
S6 Package
6-Lead Plastic TSOT-23
(Reference LTC DWG # 05-08-1636)
2.90 BSC
(NOTE 4)
0.62
MAX
0.95
REF
1.22 REF
1.50 – 1.75
2.80 BSC
1.4 MIN
3.85 MAX 2.62 REF
(NOTE 4)
PIN ONE ID
RECOMMENDED SOLDER PAD LAYOUT
PER IPC CALCULATOR
0.30 – 0.45
6 PLCS (NOTE 3)
0.95 BSC
0.80 – 0.90
0.20 BSC
DATUM ‘A’
0.01 – 0.10
1.00 MAX
0.30 – 0.50 REF
1.90 BSC
0.09 – 0.20
(NOTE 3)
S6 TSOT-23 0302 REV B
NOTE:
1. DIMENSIONS ARE IN MILLIMETERS
2. DRAWING NOT TO SCALE
3. DIMENSIONS ARE INCLUSIVE OF PLATING
4. DIMENSIONS ARE EXCLUSIVE OF MOLD FLASH AND METAL BURR
5. MOLD FLASH SHALL NOT EXCEED 0.254mm
6. JEDEC PACKAGE REFERENCE IS MO-193
6656f
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no representa-
tion that the interconnection of its circuits as described herein will not infringe on existing patent rights.
ꢀꢀ
LT6656
Typical applicaTion
ADC Reference
IN
OUT
3V TO 18V
LT6656
C1
1µF
C2
0.1µF
R16
10k
R17
10k
V
V
CC
REF
–
+
TO MCU
CS
IN
C10
0.1µF
SCK
SDO
LTC2452
IN
C11
0.1µF
RT7
10k
–tc°
R19
10k
6656 TA05
relaTeD parTs
PART NUMBER DESCRIPTION
COMMENTS
LT1389
LTC1440
LT1460
Nanopower Precision Shunt Voltage Reference 0.05% Max 10ppm/°C Max, 800nA Supply
Micropower Comparator with Reference
Micropower Series Reference
3.7µA Max Supply Current, 1% 1.182V Reference, MSOP, PDIP and SO-8 Packages
0.075% Max, 10ppm/°C Max Drift, 2.5V, 5V and 10V Versions,MSOP, PDIP, SO-8,
SOT-23 and TO-92 Packages
LT1461
LT1495
LTC1540
LT1634
Micropower Precision LDO Series Reference
1.5µA Precision Rail-to-Rail Dual Op Amp
Nanopower Comparator with Reference
3ppm/°C Max Drift, 0°C to 70°C, –40°C to 85°C, –40°C to 125°C Options in SO-8
1.5µA Max Supply Current, 100pA Max IOS
600nA Max Supply Current, 2% 1.182V Reference, MSOP and SO-8 Packages
Micropower Precision Shunt Voltage
Reference
0.05% Max, 10ppm/°C Max Drift, 1.25V, 2.5V, 4.096V, 5V, 10µA Maximum Supply
Current
LT1790
LTC1798
LT6003
LT6650
LT6660
LT6700
Micropower Precision Series Reference
6µA Low Dropout Series Reference
1.6V, 1µA Precision Rail-to-Rail Op Amp
Micropower Reference with Buffer Amplifier
Tiny Micropower Series Reference
0.05% Max, 10ppm/°C Max, 60µA Supply, SOT23 Package
Available in Adjustable, 2.5V, 3V, 4.096V and 5V
1µA Max Supply Current, 1.6V Minimum Operating Voltage, SOT-23 Package
0.05% Max, 5.6µA Supply, SOT-23 Package
0.2% Max, 20ppm/°C Max, 20mA Output Current, 2mm × 2mm DFN
6.5µA Supply Current, 1.4V Minimum Operating Voltage
Micropower, Low Voltage Dual Comparator
with 40mV Reference
6656f
LT 0210 • PRINTED IN USA
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
ꢀꢁ
●
●
LINEAR TECHNOLOGY CORPORATION 2010
(408) 432-1900 FAX: (408) 434-0507 www.linear.com
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