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LT6656 1A Precision Series Voltage Reference FeaTures
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DescripTion
The LT(R)6656 is a small precision voltage reference that draws less than 1A 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 temperature drift of 10ppm/C. The combined low power and precision characteristics are ideal for portable and battery powered instrumentation. 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 1F or larger output capacitance and operates with a wide range of output capacitor ESR, ensuring that the LT6656 is simple to use. This reference is fully specified for operation from -40C to 85C, and is functional over the extreme temperature range of -55C to 125C. Low hysteresis and a consistent temperature drift are obtained through advanced design, processing and packaging techniques. 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.
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Low Drift A Grade: 10 ppm/C Max B Grade: 20 ppm/C Max High Accuracy A Grade: 0.05% Max B Grade: 0.1% Max Ultralow Supply Current: 850nA High Output Drive Current: 5mA Min Low Dropout Voltage: 10mV Max Fully Specified from -40C to 85C Operational from -55C to 125C 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 Thermal Hysteresis: 25ppm Low Profile (1mm) ThinSOTTM Package
applicaTions
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Precision A/D and D/A Converters Portable Gas Monitors Battery- or Solar-Powered Systems Precision Regulators Low Voltage Signal Processing Micropower Remote Sensing
Typical applicaTion
Basic Connection
VOUT 2.5V 1F
6656 TA01a
Output Voltage Temperature Drift
2.503 38 TYPICAL UNITS
2.502 2.510V VIN 18V 0.1 F LT6656-2.5
VOUT (V)
2.501
2.500
2.499
2.498 -40
-20
0 20 40 TEMPERATURE (C)
60
80
6652 TA01b
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LT6656 absoluTe MaxiMuM raTings
(Note 1)
pin conFiguraTion
TOP VIEW GND* 1 GND 2 NC 3 6 VOUT 5 NC 4 VIN
Input Voltage.............................................................20V Output Voltage ........................................... -0.3V to 20V Output Voltage Above Input Voltage .......................20V Specified Temperature Range Commercial ............................................. 0C to 70C Industrial .............................................-40C to 85C Operating Temperature Range ............... -55C to 125C Output Short Circuit Duration ......................... Indefinite Junction Temperature .......................................... 150C Storage Temperature Range (Note 2)..... -65C to 150C Lead Temperature (Soldering, 10 sec.) (Note 3)................................................................. 300C
S6 PACKAGE 6-LEAD PLASTIC TSOT-23 TJMAX = 150C, JA = 230C/W *CONNECT PIN TO DEVICE GND (PIN 2)
orDer inForMaTion
LEAD FREE FINISH LT6656ACS6-2.5#PBF LT6656BCS6-2.5#PBF LT6656AIS6-2.5#PBF LT6656BIS6-2.5#PBF TAPE AND REEL LT6656ACS6-2.5#TRPBF LT6656BCS6-2.5#TRPBF LT6656AIS6-2.5#TRPBF LT6656BIS6-2.5#TRPBF PART MARKING* LTFGW LTFGW LTFGW LTFGW PACKAGE DESCRIPTION 6-Lead Plastic TSOT-23 6-Lead Plastic TSOT-23 6-Lead Plastic TSOT-23 6-Lead Plastic TSOT-23 SPECIFIED TEMPERATURE RANGE 0C to 70C 0C to 70C -40C to 85C -40C to 85C
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 OUTPUT VOLTAGE 2.5V INITIAL ACCURACY 0.05% 0.1% TEMPERATURE COEFFICIENT 10ppm/C 20ppm/C 0C to 70C ORDER PART NUMBER** LT6656ACS6-2.5 LT6656BCS6-2.5 -40C to 85C ORDER PART NUMBER** LT6656AIS6-2.5 LT6656BIS6-2.5
**See Order Information section for complete part number listing.
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LT6656 elecTrical characTerisTics
PARAMETER Output Voltage Error Output Voltage Temperature Coefficient (Note 4) Line Regulation Load Regulation (Note 5) Dropout Voltage (Note 6) LT6656A LT6656B LT6656A LT6656B VIN = (VOUT + 0.5V) to 18V
l l l
The l denotes the specifications which apply over the specified temperature range, otherwise specifications are at TA = 25C. VIN = VOUT + 500mV, CL = 1F IL = 0, unless otherwise noted. (Note 9) ,
CONDITIONS MIN -0.05 -0.10 5 12 2 65
l
TYP
MAX 0.05 0.10 10 20 25 40 150 375 10 40 500 1.0 1.5
UNITS % % ppm/C ppm/C ppm/V ppm/V ppm/mA ppm/mA mV mV mV A A mA mA A A VP-P VRMS ms ppm/kHr ppm ppm
ISOURCE = 5mA VOUT Error 0.1% ISOURCE = 0A ISOURCE = 5mA
l l
3
Supply Current
l
0.85 Sourcing, Short VOUT to GND Sinking, Short VOUT to VIN VIN = -18V, VOUT = GND VIN = GND, VOUT = 18V 0.1Hz to 10Hz 10Hz to 1kHz 0.1% Settling T = 0C to 70C T = -40C to 85C 18 4 35 30 60 80 25 50 25 70
Output Short Circuit Current Input Reverse Leakage Current Reverse Output Current Output Voltage Noise (Note 7) Turn-On Time Long Term Drift of Output Voltage (Note 8) Hysteresis (Note 9)
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. Note 4: Temperature coefficient is measured by dividing the maximum 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
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 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 25C, 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.
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LT6656 Typical perForMance characTerisTics
Output Voltage Temperature Drift
2.514 38 TYPICAL UNITS 2.512 VIN = 3V CL = 1F 2.510 IL = 0 NUMBER OF UNITS 2.508 VOUT (V) 2.506 2.504 2.502 2.500 2.498 2.496 -60 -40 -20 0 20 40 60 80 100 120 TEMPERATURE (C) SPECIFIED TEMPERATURE RANGES INDUSTRIAL COMMERCIAL 200
Typical VOUT Distribution
Supply Current vs Input Voltage
100 TA = 125C TA = 85C TA = 25C TA = -40C
SUPPLY CURRENT (A)
VIN = 3V 180 CL = 1F IL = 0 160 T = 25C A 140 120 100 80 60 40 20 0 2.4975 2.4985 2.4995 2.5005 2.5015 OUTPUT VOLTAGE (V)
6656 G02
10
1
0.1
0
2
4
6 8 10 12 14 16 18 20 INPUT VOLTAGE (V)
6656 G03
6652 G01
Dropout Voltage
1000 OUTPUT VOLTAGE CHANGE (ppm) VIN = 3V VIN = VOUT VOUT = 0.1% 1000 750 500 250 0 -250
Load Regulation(Sourcing)
VIN = 3V CL = 1F OUTPUT VOLTAGE CHANGE (%) 2.0
Load Regulation (Sinking)
TA = 85C, 125C TA = 25C TA = 0C TA = -40C
DROPOUT VOLTAGE (mV)
1.5
100
1.0
0.5
10 TA = 125C TA = 85C TA = 25C TA = -40C 1 10 100 1m LOAD CURRENT (A) 10m
6656 G04
1 0.1
-500 0.1
TA = 125C TA = 85C TA = 25C TA = -40C 1 10 100 1m LOAD CURRENT (A) 10m
6656 G05
0 VIN = 3V CL = 1F -0.5 10
100 LOAD CURRENT (A)
1m
6656 G06
Ground Current vs Load Current
1000 VIN = 3V CL = 1F OUTPUT VOLTAGE (V) 2.507
Line Regulation
POWER SUPPLY REJECTION RATIO (dB) IL = 0 2.506 CL = 1F 2.505 90 80 70 60 50 40 30 20 10 0
Power Supply Rejection Ratio vs Frequency
VIN = 3V CL = 1F IL = 0
GROUND CURRENT (A)
100
2.504 2.503 2.502 2.501 2.500 2.499 2.498 0 2 4
TA = 125C TA = 85C TA = 25C TA = -40C
10 TA = 125C TA = 85C TA = 25C TA = -40C 100 1m LOAD CURRENT (A) 10m
6656 G07
1 10
6 8 10 12 14 16 18 20 INPUT VOLTAGE (V)
6656 G08
10
100 1k FREQUENCY (Hz)
10k
6656 G09
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LT6656 Typical perForMance characTerisTics
Output Impedance vs Frequency
1k IL = 0 OUTPUT IMPEDANCE ( ) IL = 10A 100 IL = 100A VIN = 3V CL = 1F REVERSE INPUT CURRENT (A) 100
Reverse Input Current
VOUT = GND REVERSE OUTPUT CURRENT (A) 100
Reverse Output Current
VIN = GND
10
10
1 TA = 125C TA = 85C TA = 25C TA = -40C 0 -2 -4 -6 -8 -10 -12 -14 -16 -18 -20 INPUT VOLTAGE (V)
6656 G11
10
10
100 1k FREQUENCY (Hz)
10k
6656 G10
0
1
TA = 125C TA = 85C TA = 25C TA = -40C 0 5 10 15 OUTPUT VOLTAGE (V) 20
6656 G12
Output Noise 0.1Hz to 10Hz
VS = 3V CL = 1F IL = 0 OUTPUT NOISE (20V/DIV) NOISE VOLTAGE (V/Hz) 16
Output Voltage Noise Spectrum vs Load Current
VS = 3V 14 CL = 1F 12 10 8 6 4 2 IL = 0 IL = 10A IL = 250A IL = 1mA
TIME (1s/DIV)
6656 G13
0
10
100 1k FREQUENCY (Hz)
10k
6656 G14
Output Noise Voltage Spectrum vs Load Capacitance
40 VIN = 3V 35 IL = 0 NOISE VOLTAGE (V/Hz) 30 25 20 15 10 5 0 1 10 100 FREQUENCY (Hz) 1k
6656 G15
Long-Term Drift
200 VIN = 3V 150 CL = 1F IL = 0 LONG TERM DRIFT (ppm) 100 50 0 -50 -100 -150 5 TYPICAL PARTS SOLDERED ONTO PCB -200 0 100 200 300 400 500 600 700 800 900 1000 HOURS
6656 G16
CL = 47F
CL = 4.7F CL = 0.47F
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LT6656 pin FuncTions
GND* (Pin 1): Internal Function. This pin must be tied to ground. GND (Pin 2): Device Ground. NC (Pin 3): Not internally connected. May be tied to VIN, VOUT, GND or floated. VIN (Pin 4): Power Supply. The minimum supply varies with output load and voltage option, see the Dropout Voltage specification in the Electrical Characteristics table. The maximum input voltage is 18V. Bypass VIN with a 0.1F capacitor to ground. NC (Pin 5): Not internally connected. May be tied to VIN, VOUT, GND or floated. VOUT (Pin 6): Output Voltage. A minimum output capacitor of 1F is required for stable operation.
block DiagraM
4 VIN
NC 5
VOUT
6
BANDGAP
ERROR AMP NC 3
GND 1
GND 2
6656 BD
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LT6656 applicaTions inForMaTion
Long Battery Life 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, the shunt reference must always sink this current, 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 supply from VOUT + 10mV to 18V, depending on the load 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 W, yet the same connection can deliver 5mA of load current when required. Start-Up 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. Bypass and Load Capacitance The LT6656 voltage reference needs an input bypass capacitor of 0.1F or larger, however, the bypassing of other local devices may serve as the required component. The output of the device requires a capacitance of 1F 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 output response to a 500mV input step is shown in Figure 5 with a more detailed photo and description in the Output Settling section.
VIN 3V CIN 0.1F 4 LT6656-2.5 1, 2 6 CL 1F R2 VGEN R1 2N7000
6656 F02
3V
Figure 2. Transient Load Test Circuit
0A IOUT 100A
2.52V VOUT 2.50V 2.48V 5ms/DIV
6656 F03
Figure 3. Transient Response, 0A to 100A Load Step (R2 = 24.9k, R1 = Open)
1mA IOUT VIN 1V/DIV VOUT 2.52V VOUT 2.50V 2.48V 1ms/DIV
6656 F01
2mA
5ms/DIV
6656 F04
Figure 1. Turn-On Characteristics, CL = 1F
Figure 4. Transient Response, 1mA to 2mA Load Step (R1 = R2 = 2.49k)
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LT6656 applicaTions inForMaTion
30 VIN 3.25V 2.75V 25 20 15 10 5 0 0.001 IL = LOAD STEP TO 2A IL = ZERO TO LOAD STEP 0.01 0.1 LOAD STEP (mA) 1 10
6656 F06
VIN = 3V CL = 1F IL = LOAD STEP TO ZERO
2.7V VOUT 2.5V 2.3V 5ms/DIV
6656 F05
Figure 5. Output Response to 0.5VP-P Step on VIN, CL = 1F IL = 0 ,
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 architecture 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)(CL ) + 2ms IL
Figure 6. Output Settling Time to 0.05% vs Load Step
VIN
3.25V 2.75V
IL = 0 VOUT 10mV/DIV IL = 5A
OUTPUT SETTLING TIME (ms)
5ms/DIV
6656 F07
Figure 7. Detailed Output Response to a 0.5V Input Step, CIN = CL = 1F
Output Noise In general, output noise in the LT6656 is proportional to the bandwidth of the output stage and therefore increases with higher load current and lower output capacitance. 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 current to typically less than 40A when either the LT6656
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The graph in Figure 6 shows the settling time versus load step with no load and with a constant 2A 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 5A 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.
LT6656 applicaTions inForMaTion
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 30A. 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. Long-Term Drift 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 into a constant temperature oven with TA = 30C, their outputs scanned regularly and measured with an 8.5 digit DVM. The parts chosen in the Long Term Drift curves in the Typical Performance Characteristics section represent high, low and typical units. Hysteresis Hysteresis on the LT6656 is measured in two steps, for example, from 25C to -40C to 25C, then from 25C to 85C to 25C, for the industrial temperature range. This two-step cycle is repeated several times and the maximum 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. 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 LT6656 will not exceed the maximum junction temperature when operating within its specified temperature range of -40C to 85C, maximum input voltage of 18V and specified load current of 5mA.
30 VIN = 3V CL = 1F 25 IL = 0 NUMBER OF UNITS 20 15 10 5 0 0C TO 25C 70C TO 25C
-60
-40
-20 0 20 HYSTERESIS (ppm)
40
60
6656 F08
Figure 8. 0C to 70C Hysteresis
20 18 16 NUMBER OF UNITS 14 12 10 8 6 4 2 0 -160 -120 -80 -40 0 40 80 120 160 HYSTERESIS (ppm)
6656 F09
-40C TO 25C 85C TO 25C
VIN = 3V CL = 1F IL = 0
Figure 9. -40C to 85C Hysteresis
IR Reflow Shift The different expansion and contraction rates of the materials that make up the LT6656 package induce small stresses on the die that can cause the output to shift during IR reflow. Common lead free IR reflow profiles reach over 250C, considerably more than lead solder profiles. The higher reflow temperature of the lead free parts exacerbates the issue of thermal expansion and contraction causing the output shift to generally be greater than with a leaded reflow process. 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
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LT6656 applicaTions inForMaTion
300 380s TP = 260C 225 TL = 217C TS(MAX) = 200C TS = 190C 150 T = 150C RAMP TO 150C tL 130s 40s 120s 0 0 2 4 6 MINUTES 8 10
6656 F10
RAMP DOWN
tP 30s
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. PC Board Layout The mechanical stress of soldering a surface mount voltage reference to a PC board can cause the output voltage to shift and temperature coefficient to change. 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 The input and output capacitors should be mounted close to the package. The GND and VOUT traces should be as short as possible to minimize the voltage drops caused by load and ground currents. Excessive trace resistance directly impacts load regulation.
75
Figure 10. Lead Free Reflow Profile Due to IR Reflow
7 VIN = 3V CL = 1F 6 I =0 L NUMBER OF UNITS 5 4 3 2 1 0 0 20 60 100 140 180 220 CHANGE IN OUTPUT VOLTAGE (ppm)
6656 F11
3 CYCLES 1 CYCLE
Figure 11. Output Voltage Shift Due to IR Reflow, Peak Temperature = 260C
Typical applicaTions
Regulator Reference 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
IN C13 0.1F LT6656 OUT C12 10F MCU VCC/VREF PB0/AIN0/AREF/MOSI PB1/INT0/AIN1/MISO/OC1A PB2/ADC1/SCK/T0/INT0 PB3/ADC2 PB4/ADC3 PB5/RESET/ADC0 GND
6656 TA02
be a good match with a small, low power microcontroller. Using the LT6656 as a regulator reduces power consumption, decreases solution size and increases the accuracy of the microcontroller's on board ADC.
Microcontroller Reference and Regulator
3V TO 18V
5 6 7 2 3 1
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0
LT6656 Typical applicaTions
Extended Supply Range Reference
VIN UP TO 160V R3 330k R4 4.7k
Boosted Output Current Reference
3.6V TO 18V R5 220
+
10F
Q2 MMBT5551 C4 0.1F LT6656 LT6656
6656 TA03
Q3 2N2905 VOUT 40mA MAX
D1 BZX584C12
C3 1F
VOUT
6656 TA04
C5 1F
package DescripTion
(Reference LTC DWG # 05-08-1636)
0.62 MAX 0.95 REF 2.90 BSC (NOTE 4)
S6 Package 6-Lead Plastic TSOT-23
1.22 REF
3.85 MAX 2.62 REF
1.4 MIN
2.80 BSC
1.50 - 1.75 (NOTE 4) PIN ONE ID
RECOMMENDED SOLDER PAD LAYOUT PER IPC CALCULATOR
0.95 BSC 0.80 - 0.90
0.30 - 0.45 6 PLCS (NOTE 3)
0.20 BSC DATUM `A' 1.00 MAX
0.01 - 0.10
0.30 - 0.50 REF
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
0.09 - 0.20 (NOTE 3)
1.90 BSC
S6 TSOT-23 0302 REV B
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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 representation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
LT6656 Typical applicaTion
ADC Reference
IN C2 0.1F OUT C1 1F VREF VCC 3V TO 18V LT6656
R16 10k CS SCK SDO IN- C10 0.1F
R17 10k
TO MCU
LTC2452 IN+
C11 0.1F
RT7 10k -tc
6656 TA05
R19 10k
relaTeD parTs
PART NUMBER LT1389 LTC1440 LT1460 LT1461 LT1495 LTC1540 LT1634 LT1790 LTC1798 LT6003 LT6650 LT6660 LT6700 DESCRIPTION Micropower Comparator with Reference Micropower Series Reference Micropower Precision LDO Series Reference 1.5A Precision Rail-to-Rail Dual Op Amp Nanopower Comparator with Reference Micropower Precision Shunt Voltage Reference Micropower Precision Series Reference 6A Low Dropout Series Reference 1.6V, 1A Precision Rail-to-Rail Op Amp Micropower Reference with Buffer Amplifier Tiny Micropower Series Reference Micropower, Low Voltage Dual Comparator with 40mV Reference COMMENTS 3.7A 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 3ppm/C Max Drift, 0C to 70C, -40C to 85C, -40C to 125C Options in SO-8 1.5A Max Supply Current, 100pA Max IOS 600nA Max Supply Current, 2% 1.182V Reference, MSOP and SO-8 Packages 0.05% Max, 10ppm/C Max Drift, 1.25V, 2.5V, 4.096V, 5V, 10A Maximum Supply Current 0.05% Max, 10ppm/C Max, 60A Supply, SOT23 Package Available in Adjustable, 2.5V, 3V, 4.096V and 5V 1A Max Supply Current, 1.6V Minimum Operating Voltage, SOT-23 Package 0.05% Max, 5.6A Supply, SOT-23 Package 0.2% Max, 20ppm/C Max, 20mA Output Current, 2mm x 2mm DFN 6.5A Supply Current, 1.4V Minimum Operating Voltage Nanopower Precision Shunt Voltage Reference 0.05% Max 10ppm/C Max, 800nA Supply
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Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900 FAX: (408) 434-0507
LT 0210 * PRINTED IN USA
www.linear.com
LINEAR TECHNOLOGY CORPORATION 2010

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