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LT6654

6654fd

For more information www.linear.com/LT6654

Typical applicaTion

DescripTion

SOT-23 Precision Wide

Supply High Output Drive

Low Noise Reference

The LT

6654 is a family of small precision voltage ref-

erences that offers high accuracy, low noise, low drift,

w dropout and low power. The LT6654 operates from

voltages up to 36V and is fully speciﬁed from –55°C to

125°C. A buffered output ensures ±10mA of output drive

with low output impedance and precise load regulation.

These features, in combination, make the LT6654 ideal

for portable equipment, industrial sensing and control,

and automotive applications.

The LT6654 was designed with advanced manufactur

ing techniques and curvature compensation to provide

10ppm/°C temperature drift and 0.05% initial accuracy.

Low thermal hysteresis ensures high accuracy and

1.6ppm

P-P

noise minimizes measurement uncertainty.

Since the LT6654 can also sink current, it can operate

as a low power negative voltage reference with the same

precision as a positive reference.

The LT6654 references are offered in 6-lead SOT-23

package and an 8-lead LS8 package. The LS8 is a 5mm

× 5mm surface mount hermetic package that provides

outstanding stability.

L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and

ThinSOT is a trademark of Linear Technology Corporation. All other trademarks are the property

of their respective owners.

Basic Connection

Low Drift:

A-Grade: 10ppm/°C Max

B-Grade: 20ppm/°C Max

High Accuracy:

A-Grade: ±0.05% Max

B-Grade: ±0.10% Max

Low Noise: 1.6ppm

P-P

(0.1Hz to 10Hz)

Wide Supply Range to 36V

Low Thermal Hysteresis: LS8 15ppm (–40°C to 125°C)

Long Term Drift: (LS8) 15ppm/√kHr

Line Regulation (Up to 36V): 5ppm/V Max

Low Dropout Voltage: 100mV Max

Sinks and Sources ±10mA

Load Regulation at 10mA: 8ppm/mA Max

Fully Speciﬁed from –55°C to 125°C

Available Output Voltage Options: 1.25V, 2.048V, 2.5V,

3V, 3.3V, 4.096V, 5V

Low Proﬁle (1mm) ThinSOT™ Package and 5mm ×

5mm Surface Mount Hermetic Package

FeaTures

applicaTions

Automotive Control and Monitoring

High Temperature Industrial

High Resolution Data Acquisition Systems

Instrumentation and Process Control

Precision Regulators

Medical Equipment

Output Voltage Temperature Drift

LT6654

0.1µF

OUT

+ 0.5V) < V

< 36V

OUTIN

GND

1µF

OUT

6654 TA01a

TEMPERATURE (°C)

–60

–0.10

OUT

ACCURACY (%)

–0.05

0.05

0.00

0.10

40200–40 –20

6654 TA01b

140

100

120

3 TYPICAL PARTS

LT6654-2.5

Summary of content (22 pages)

PAGE 1
LT6654 SOT-23 Precision Wide Supply High Output Drive Low Noise Reference Description Features Low Drift: A-Grade: 10ppm/°C Max B-Grade: 20ppm/°C Max n High Accuracy: A-Grade: ±0.05% Max B-Grade: ±0.10% Max n Low Noise: 1.6ppm P-P (0.
PAGE 2
LT6654 Absolute Maximum Ratings (Note 1) Input Voltage VIN to GND............................ –0.3V to 38V Output Voltage VOUT..........................–0.3V to VIN + 0.3V Output Short-Circuit Duration .......................... Indefinite Specified Temperature Range H-Grade.............................................. –40°C to 125°C MP-Grade........................................... –55°C to 125°C Operating Temperature Range................ –55°C to 125°C Storage Temperature Range (Note 2)......
PAGE 3
LT6654 order information Lead Free Finish TAPE AND REEL (MINI) TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION LT6654AHS6-1.25#TRMPBF LT6654AHS6-1.25#TRPBF LTFVD 6-Lead Plastic TSOT-23 LT6654BHS6-1.25#TRMPBF LT6654BHS6-1.25#TRPBF LTFVD 6-Lead Plastic TSOT-23 LT6654AMPS6-1.25#TRMPBF LT6654AMPS6-1.25#TRPBF LTFVD 6-Lead Plastic TSOT-23 LT6654BMPS6-1.25#TRMPBF LT6654BMPS6-1.25#TRPBF LTFVD 6-Lead Plastic TSOT-23 LT6654AHS6-2.048#TRMPBF LT6654AHS6-2.048#TRPBF LTFVF 6-Lead Plastic TSOT-23 LT6654BHS6-2.
PAGE 4
LT6654 Available Options OUTPUT VOLTAGE 1.25V INITIAL ACCURACY TEMPERATURE COEFFICIENT 0.05% 10ppm/°C 0.1% 20ppm/°C 0.05% 10ppm/°C 0.1% 20ppm/°C 2.048V 0.05% 10ppm/°C 0.1% 20ppm/°C 0.05% 10ppm/°C 0.1% 20ppm/°C 10ppm/°C 2.5V 0.05% 10ppm/°C 0.05% 20ppm/°C 0.1% 20ppm/°C 0.1% 10ppm/°C 0.05% 20ppm/°C 0.1% 3V 0.05% 10ppm/°C 0.1% 20ppm/°C 0.05% 10ppm/°C 0.1% 20ppm/°C 10ppm/°C 3.3V 0.05% 0.1% 20ppm/°C 0.05% 10ppm/°C 0.1% 20ppm/°C 4.096V 0.05% 10ppm/°C 0.1% 20ppm/°C 0.05% 10ppm/°C 0.1% 20ppm/°C 10ppm/°C 5V 0.05% 0.
PAGE 5
LT6654 Electrical Characteristics The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C, CL = 1µF and VIN = VOUT + 0.5V, unless otherwise noted. For LT6654-1.25, VIN = 2.4V, unless otherwise noted. PARAMETER CONDITIONS MIN Output Voltage Accuracy LT6654A LT6654B LT6654AH LT6654BH LT6654AMP LT6654BMP l l l l –0.05 –0.10 –0.215 –0.43 –0.23 –0.
PAGE 6
LT6654 Electrical Characteristics The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C, CL = 1µF and VIN = VOUT + 0.5V, unless otherwise noted. For LT6654-1.25, VIN = 2.4V, unless otherwise noted.
PAGE 7
LT6654 Typical Performance Characteristics The characteristic curves are similar across the LT6654 family. Curves from the LT6654-1.25, LT6654-2.5 and the LT6654-5 represent the full range of typical performance of all voltage options. Characteristic curves for other output voltages fall between these curves and can be estimated based on their output. 1.25V Output Voltage Temperature Drift 1.2520 1.25V Output Impedance vs Frequency 1.25V Turn-On Characteristics 100 THREE TYPICAL PARTS 1.
PAGE 8
LT6654 Typical Performance Characteristics The characteristic curves are similar across the LT6654 family. Curves from the LT6654-1.25, LT6654-2.5 and the LT6654-5 represent the full range of typical performance of all voltage options. Characteristic curves for other output voltages fall between these curves and can be estimated based on their output. 2.5V Output Voltage Temperature Drift THREE TYPICAL PARTS 2.5050 INPUT CURRENT (µA) 2.501 2.500 2.499 2.5040 –40°C 500 OUTPUT VOLTAGE (V) 2.
PAGE 9
LT6654 Typical Performance Characteristics The characteristic curves are similar across the LT6654 family. Curves from the LT6654-1.25, LT6654-2.5 and the LT6654-5 represent the full range of typical performance of all voltage options. Characteristic curves for other output voltages fall between these curves and can be estimated based on their output. 2.5V Integrated Noise 10Hz to 10kHz 2.5V Power Supply Rejection Ratio vs Frequency –20 10 1 0.1 0.
PAGE 10
LT6654 Typical Performance Characteristics The characteristic curves are similar across the LT6654 family. Curves from the LT6654-1.25, LT6654-2.5 and the LT6654-5 represent the full range of typical performance of all voltage options. Characteristic curves for other output voltages fall between these curves and can be estimated based on their output. 2.5V Load Transient Response (Sinking) 2.5V Long Term Drift (LS8) 150 5.003 120 5.
PAGE 11
LT6654 Typical Performance Characteristics The characteristic curves are similar across the LT6654 family. Curves from the LT6654-1.25, LT6654-2.5 and the LT6654-5 represent the full range of typical performance of all voltage options. Characteristic curves for other output voltages fall between these curves and can be estimated based on their output.
PAGE 12
LT6654 Block Diagrams 8 7 1 3 VIN DNC DNC + VOUT BANDGAP VOUT – GND GND 2 5 6 4 NC 6654 BDa LS8 4 3 5 2 VIN DNC DNC + BANDGAP VOUT 6 – GND GND 1 6654 BD SOT23 6654fd 12 For more information www.linear.
PAGE 13
LT6654 Applications Information Bypass and Load Capacitors The LT6654 voltage references should have an input bypass capacitor of 0.1µF or larger, however the bypassing on other components nearby is sufficient. In high voltage applications, VIN > 30V, an output short-circuit to ground can create an input voltage transient that could exceed the maximum input voltage rating. To prevent this worst-case condition, an RC input line filter of 10µs (i.e. 10Ω and 1µF) is recommended.
PAGE 14
LT6654 Applications Information Positive or Negative Operation IOUT –0.5mA In addition to the series connection, as shown on the front page of this data sheet, the LT6654 can be operated as a negative voltage reference. 0.5mA VOUT 20mV/DIV/AC 2.5V/DC CLOAD = 1µF 50µs/DIV 6654 F04 Figure 4. LT6654-2.5 Sourcing and Sinking 0.5mA The circuit in Figure 7 shows an LT6654 configured for negative operation.
PAGE 15
LT6654 Applications Information Long-Term Drift Long-term drift cannot be extrapolated from accelerated high temperature testing. This erroneous technique gives drift numbers that are wildly optimistic. The only way long-term drift can be determined is to measure it over the time interval of interest. The LT6654 drift data was taken on 40 parts that were soldered into PC boards similar to a real world application.
PAGE 16
LT6654 Applications Information Power Dissipation 0.40 The LT6654 includes output current limit circuitry, as well as thermal limit circuitry, to protect the reference from damage in the event of excessive power dissipation. The LT6654 is protected from damage by a thermal shutdown circuit. However, changes in performance may occur as a result of operation at high temperature. 0.7 T = 150°C θJA = 192°C/W 0.6 335mW 0.35 POWER (W) 0.30 0.25 10mA LOAD 0.20 0.15 0.10 0.
PAGE 17
LT6654 Applications Information Hysteresis Humidity Sensitivity The hysteresis data is shown in Figure 11. The LT6654 is capable of dissipating relatively high power. For example, with a 36V input voltage and 10mA load current applied to the LT6654-2.5, the power dissipation is PD = 33.5V • 10mA = 335mW, which causes an increase in the die temperature of 64°C. This could increase the junction temperature above 125°C (TJMAX is 150°C) and may cause the output to shift due to thermal hysteresis.
PAGE 18
LT6654 Typical Applications Extended Supply Range Reference Boosted Output Current Reference 4.5V < VIN < 36V UP TO 160V 4.7µF 220Ω 330k MMBT5551 BZX84C12 2N2905 IN IN LT6654-2.5 OUT 0.1µF GND IOUT UP TO 300mA LT6654-2.5 OUT GND 1µF 1µF 6654 TA02 6654 TA03 Boosted Output Current with Current Limit Octal DAC Reference 4.5V < VIN < 36V LT6654-2.5 2.65V < VIN < 5V IN 1 LED1* 4.7µF 220Ω 0.1µF 10Ω GND OUT VIN 10µF 2 VREF 2N2905 VCC CS LT6654-2.
PAGE 19
LT6654 Package Description Please refer to http://www.linear.com/designtools/packaging/ for the most recent package drawings. S6 Package 6-Lead Plastic TSOT-23 (Reference LTC DWG # 05-08-1636) 0.62 MAX 2.90 BSC (NOTE 4) 0.95 REF 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 0.30 – 0.45 6 PLCS (NOTE 3) 0.95 BSC 0.80 – 0.90 0.20 BSC 0.01 – 0.10 1.00 MAX DATUM ‘A’ 0.30 – 0.50 REF 0.09 – 0.20 (NOTE 3) NOTE: 1.
PAGE 20
LT6654 Package Description Please refer to http://www.linear.com/designtools/packaging/ for the most recent package drawings. LS8 Package 8-Pin Leadless Chip Carrier (5mm × 5mm) (Reference LTC DWG # 05-08-1852 Rev B) 8 2.50 ±0.15 PACKAGE OUTLINE 7 1 0.5 2 6 2.54 ±0.15 1.4 3 1.50 ±0.15 4 0.70 ±0.05 × 8 e4 XYY ZZ ABCDEF Q12345 COMPONENT PIN “A1” 5.00 SQ ±0.15 5.80 SQ ±0.15 TRAY PIN 1 BEVEL APPLY SOLDER MASK TO AREAS THAT ARE NOT SOLDERED 5.00 SQ ±0.15 1.45 ±0.10 0.95 ±0.10 4.20 SQ ±0.
PAGE 21
LT6654 Revision History REV DATE DESCRIPTION PAGE NUMBER A 12/10 Added voltage options (1.250V, 2.048V, 3.000V, 4.096V, 5.000V) reflected throughout the data sheet. B 3/11 Revised conditions for Output Voltage Noise in the Electrical Characteristics section. C 8/12 Addition of LS8 Features and Order Information. Update to Electrical Characteristics to Include LS8 Package. Addition of Long Term Drift and Hysteresis Plots for LS8 Package.
PAGE 22
LT6654 Typical Application 16-Bit ADC Reference 4.6V < VS < 36V LT6654-4.096 IN OUT GND 10µF 0.1µF + IN+ –2.048V < VDIFFERENTIAL < 2.048V – VREF VCC LTC2480 IN– GND fO SDO SDI CS TO MCU SCK 6654 TA06 Related Parts PART NUMBER DESCRIPTION COMMENTS LT1460 Micropower Series Reference 0.075% Max, 10ppm/°C Max Drift, 2.