LT6656 Linear Technology Corporation, LT6656 Datasheet

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LT6656

Manufacturer Part Number
LT6656
Description
1?a Precision Series Voltage Reference
Manufacturer
Linear Technology Corporation
Datasheet

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applicaTions
Typical applicaTion
FeaTures
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2.510V V
Low Drift
High Accuracy
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
Thermal Hysteresis: 25ppm
Low Profile (1mm) ThinSOT™ Package
Precision A/D and D/A Converters
Portable Gas Monitors
Battery- or Solar-Powered Systems
Precision Regulators
Low Voltage Signal Processing
Micropower Remote Sensing
A Grade: 10 ppm/°C Max
B Grade: 20 ppm/°C Max
A Grade: 0.05% Max
B Grade: 0.1% Max
IN
18V
0.1 F
Basic Connection
LT6656-2.5
6656 TA01a
1 F
V
2.5V
OUT
DescripTion
The LT
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.
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-
pacitance 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 –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.
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.
®
6656 is a small precision voltage reference that
2.503
2.502
2.501
2.500
2.499
2.498
–40
1µA Precision Series
Voltage Reference
Output Voltage Temperature Drift
38 TYPICAL UNITS
–20
TEMPERATURE (°C)
0
20
40
60
6652 TA01b
LT6656
80

6656f

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LT6656 Summary of contents

Page 1

... 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- pacitance and operates with a wide range of output capacitor ESR, ensuring that the LT6656 is simple to use. ...

Page 2

... Plastic TSOT-23 LTFGW 6-Lead Plastic TSOT-23 LTFGW 6-Lead Plastic TSOT-23 LTFGW 6-Lead Plastic TSOT-23 http://www.linear.com/leadfree/ http://www.linear.com/tapeandreel/ TEMPERATURE COEFFICIENT ORDER PART NUMBER** 10ppm/°C LT6656ACS6-2.5 20ppm/°C LT6656BCS6-2.5 TOP VIEW GND OUT GND PACKAGE ...

Page 3

... 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 degrees of operational temperature) hysteresis is usually not a dominant error source. LT6656 = 0, unless otherwise noted. (Note 9) L MIN TYP ...

Page 4

... LT6656 Typical perForMance characTerisTics Output Voltage Temperature Drift 2.514 38 TYPICAL UNITS 2.512 1µ 2.510 L 2.508 2.506 SPECIFIED TEMPERATURE RANGES INDUSTRIAL 2.504 COMMERCIAL 2.502 2.500 2.498 2.496 –60 –40 – 100 120 TEMPERATURE (°C) 6652 G01 Dropout Voltage ...

Page 5

... G13 200 150 100 4.7µF L – 0.47µF –100 L –150 –200 100 1k 0 6656 G15 LT6656 Reverse Output Current 100 V = GND 125°C = 85°C = 25°C = –40°C 1 –18 – OUTPUT VOLTAGE (V) 6656 G11 Output Voltage Noise Spectrum vs Load Current ...

Page 6

... 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 GND or floated. OUT V (Pin 4): Power Supply. The minimum supply varies with IN output load and voltage option, see the Dropout Voltage ...

Page 7

... 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- ...

Page 8

... Figure 7. Detailed Output Response to a 0.5V Input Step 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 2ms peaking in the noise response may be the dominant factor in determining the output noise level ...

Page 9

... 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. ...

Page 10

... Figure 11. Output Voltage Shift Due to IR Reflow, Peak Temperature = 260°C 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 3V TO 18V ...

Page 11

... LTC DWG # 05-08-1636) 1.22 REF 1.50 – 1.75 2.80 BSC 1.4 MIN (NOTE 4) 0.95 BSC 0.80 – 0.90 1.00 MAX 0.09 – 0.20 (NOTE 3) LT6656 Boosted Output Current Reference + R5 10µF 220 Q3 2N2905 V OUT LT6656 40mA MAX C5 1µF 6656 TA04 2.90 BSC (NOTE 4) PIN ONE ID 0.30 – 0.45 6 PLCS (NOTE 3) 0.01 – 0.10 1.90 BSC S6 TSOT-23 0302 REV B 6656f  ...

Page 12

... Tiny Micropower Series Reference LT6700 Micropower, Low Voltage Dual Comparator with 40mV Reference  Linear Technology Corporation 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 FAX: (408) 434-0507 ● ADC Reference OUT LT6656 C1 1µ REF TO MCU CS SCK LTC2452 SDO COMMENTS 3.7µA Max Supply Current, 1% 1.182V Reference, MSOP , PDIP and SO-8 Packages 0.075% Max, 10ppm/° ...

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