LT6654 Precision Wide Supply High Output Drive Low Noise Reference Description Features Low Drift: nn A-Grade: 10ppm/C Max nn B-Grade: 20ppm/C Max nn High Accuracy: nn A-Grade: 0.05% Max nn B-Grade: 0.10% Max nn Low Noise: 1.6ppm P-P (0.1Hz to 10Hz) nn Wide Supply Range to 36V nn Low Thermal Hysteresis: LS8 15ppm (-40C to 125C) nn Long Term Drift: (LS8) 15ppm/kHr nn Line Regulation (Up to 36V): 5ppm/V Max nn Low Dropout Voltage: 100mV Max nn Sinks and Sources 10mA nn Load Regulation at 10mA: 8ppm/mA Max nn Fully Specified from -55C to 125C nn Available Output Voltage Options: 1.25V, 2.048V, 2.5V, 3V, 3.3V, 4.096V, 5V nn Low Profile (1mm) ThinSOTTM Package and 5mm x 5mm Surface Mount Hermetic Package nn Applications Automotive Control and Monitoring High Temperature Industrial nn High Resolution Data Acquisition Systems nn Instrumentation and Process Control nn Precision Regulators nn Medical Equipment nn nn The LT(R)6654 is a family of small precision voltage references that offers high accuracy, low noise, low drift, low dropout and low power. The LT6654 operates from voltages up to 36V and is fully specified from -55C to 125C. 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 manufacturing techniques and curvature compensation to provide 10ppm/C temperature drift and 0.05% initial accuracy. Low thermal hysteresis ensures high accuracy and 1.6ppmP-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 x 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. Typical Application Output Voltage Temperature Drift 0.10 (VOUT + 0.5V) < VIN < 36V IN CIN 0.1F LT6654 GND VOUT OUT CL 1F 6654 TA01a VOUT ACCURACY (%) Basic Connection 3 TYPICAL PARTS LT6654-2.5 0.05 0.00 -0.05 -0.10 -60 -40 -20 0 20 40 60 80 100 120 140 TEMPERATURE (C) 6654 TA01b For more information www.linear.com/LT6654 6654fg 1 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 I-Grade.................................................-40C to 85C H-Grade.............................................. -40C to 125C MP-Grade........................................... -55C to 125C Operating Temperature Range................ -55C to 125C Storage Temperature Range (Note 2)...... -65C to 150C Lead Temperature (Soldering, 10 sec.) (Note 9).................................................................. 300C Pin Configuration TOP VIEW VIN TOP VIEW GND* 1 6 VOUT DNC 1 GND 2 5 DNC NC 2 DNC 3 4 VIN GND 3 S6 PACKAGE 6-LEAD PLASTIC TSOT-23 4 7 DNC 6 VOUT 5 VOUT GND* LS8 PACKAGE 8-PIN LEADLESS CHIP CARRIER (5mm x 5mm) TJMAX = 150C, JA = 192C/W DNC: CONNECTED INTERNALLY DO NOT CONNECT EXTERNAL CIRCUITRY TO THESE PINS *CONNECT PIN TO DEVICE GND (PIN 2) Order Information 8 TJMAX = 150C, JA = 125C/W DNC: CONNECTED INTERNALLY DO NOT CONNECT EXTERNAL CIRCUITRY TO THESE PINS *CONNECT PIN TO DEVICE GND (PIN 3) http://www.linear.com/product/LT6654#orderinfo Lead Free Finish TAPE AND REEL (MINI) TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION SPECIFIED TEMPERATURE RANGE LT6654AIS6-1.25#TRMPBF LT6654AIS6-1.25#TRPBF LTFVD 6-Lead Plastic TSOT-23 -40C to 85C LT6654BIS6-1.25#TRMPBF LT6654BIS6-1.25#TRPBF LTFVD 6-Lead Plastic TSOT-23 -40C to 85C LT6654AHS6-1.25#TRMPBF LT6654AHS6-1.25#TRPBF LTFVD 6-Lead Plastic TSOT-23 -40C to 125C LT6654BHS6-1.25#TRMPBF LT6654BHS6-1.25#TRPBF LTFVD 6-Lead Plastic TSOT-23 -40C to 125C LT6654AMPS6-1.25#TRMPBF LT6654AMPS6-1.25#TRPBF LTFVD 6-Lead Plastic TSOT-23 -55C to 125C LT6654BMPS6-1.25#TRMPBF LT6654BMPS6-1.25#TRPBF LTFVD 6-Lead Plastic TSOT-23 -55C to 125C LT6654AHS6-2.048#TRMPBF LT6654AHS6-2.048#TRPBF LTFVF 6-Lead Plastic TSOT-23 -40C to 125C LT6654BHS6-2.048#TRMPBF LT6654BHS6-2.048#TRPBF LTFVF 6-Lead Plastic TSOT-23 -40C to 125C LT6654AMPS6-2.048#TRMPBF LT6654AMPS6-2.048#TRPBF LTFVF 6-Lead Plastic TSOT-23 -55C to 125C LT6654BMPS6-2.048#TRMPBF LT6654BMPS6-2.048#TRPBF LTFVF 6-Lead Plastic TSOT-23 -55C to 125C 2 6654fg For more information www.linear.com/LT6654 LT6654 Order Information http://www.linear.com/product/LT6654#orderinfo Lead Free Finish TAPE AND REEL (MINI) TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION SPECIFIED TEMPERATURE RANGE LT6654AIS6-2.5#TRMPBF LT6654AIS6-2.5#TRPBF LTFJY 6-Lead Plastic TSOT-23 -40C to 85C LT6654BIS6-2.5#TRMPBF LT6654BIS6-2.5#TRPBF LTFJY 6-Lead Plastic TSOT-23 -40C to 85C LT6654AHS6-2.5#TRMPBF LT6654AHS6-2.5#TRPBF LTFJY 6-Lead Plastic TSOT-23 -40C to 125C LT6654BHS6-2.5#TRMPBF LT6654BHS6-2.5#TRPBF LTFJY 6-Lead Plastic TSOT-23 -40C to 125C LT6654AMPS6-2.5#TRMPBF LT6654AMPS6-2.5#TRPBF LTFJY 6-Lead Plastic TSOT-23 -55C to 125C LT6654BMPS6-2.5#TRMPBF LT6654BMPS6-2.5#TRPBF LTFJY 6-Lead Plastic TSOT-23 -55C to 125C LT6654AHS6-3#TRMPBF LT6654AHS6-3#TRPBF LTFVG 6-Lead Plastic TSOT-23 -40C to 125C LT6654BHS6-3#TRMPBF LT6654BHS6-3#TRPBF LTFVG 6-Lead Plastic TSOT-23 -40C to 125C LT6654AMPS6-3#TRMPBF LT6654AMPS6-3#TRPBF LTFVG 6-Lead Plastic TSOT-23 -55C to 125C LT6654BMPS6-3#TRMPBF LT6654BMPS6-3#TRPBF LTFVG 6-Lead Plastic TSOT-23 -55C to 125C LT6654AHS6-3.3#TRMPBF LT6654AHS6-3.3#TRPBF LTFVH 6-Lead Plastic TSOT-23 -40C to 125C LT6654BHS6-3.3#TRMPBF LT6654BHS6-3.3#TRPBF LTFVH 6-Lead Plastic TSOT-23 -40C to 125C LT6654AMPS6-3.3#TRMPBF LT6654AMPS6-3.3#TRPBF LTFVH 6-Lead Plastic TSOT-23 -55C to 125C LT6654BMPS6-3.3#TRMPBF LT6654BMPS6-3.3#TRPBF LTFVH 6-Lead Plastic TSOT-23 -55C to 125C LT6654AHS6-4.096#TRMPBF LT6654AHS6-4.096#TRPBF LTFVJ 6-Lead Plastic TSOT-23 -40C to 125C LT6654BHS6-4.096#TRMPBF LT6654BHS6-4.096#TRPBF LTFVJ 6-Lead Plastic TSOT-23 -40C to 125C LT6654AMPS6-4.096#TRMPBF LT6654AMPS6-4.096#TRPBF LTFVJ 6-Lead Plastic TSOT-23 -55C to 125C LT6654BMPS6-4.096#TRMPBF LT6654BMPS6-4.096#TRPBF LTFVJ 6-Lead Plastic TSOT-23 -55C to 125C LT6654AIS6-5#TRMPBF LT6654AIS6-5#TRPBF LTFVK 6-Lead Plastic TSOT-23 -40C to 85C LT6654BIS6-5#TRMPBF LT6654BIS6-5#TRPBF LTFVK 6-Lead Plastic TSOT-23 -40C to 85C LT6654AHS6-5#TRMPBF LT6654AHS6-5#TRPBF LTFVK 6-Lead Plastic TSOT-23 -40C to 125C LT6654BHS6-5#TRMPBF LT6654BHS6-5#TRPBF LTFVK 6-Lead Plastic TSOT-23 -40C to 125C LT6654AMPS6-5#TRMPBF LT6654AMPS6-5#TRPBF LTFVK 6-Lead Plastic TSOT-23 -55C to 125C LT6654BMPS6-5#TRMPBF LT6654BMPS6-5#TRPBF LTFVK 6-Lead Plastic TSOT-23 LEAD FREE FINISH PART MARKING* PACKAGE DESCRIPTION SPECIFIED TEMPERATURE RANGE -55C to 125C LT6654AHLS8-2.048#PBF 542048 8-Lead Ceramic LCC (5mm x 5mm) -40C to 125C LT6654BHLS8-2.048#PBF 542048 8-Lead Ceramic LCC (5mm x 5mm) -40C to 125C LT6654AHLS8-2.5#PBF 665425 8-Lead Ceramic LCC (5mm x 5mm) -40C to 125C LT6654BHLS8-2.5#PBF 665425 8-Lead Ceramic LCC (5mm x 5mm) -40C to 125C LT6654AHLS8-4.096#PBF 544096 8-Lead Ceramic LCC (5mm x 5mm) -40C to 125C LT6654BHLS8-4.096#PBF 544096 8-Lead Ceramic LCC (5mm x 5mm) -40C to 125C LT6654AHLS8-5#PBF 66545 8-Lead Ceramic LCC (5mm x 5mm) -40C to 125C LT6654BHLS8-5#PBF 66545 8-Lead Ceramic LCC (5mm x 5mm) -40C to 125C TRM = 500 pieces. *Temperature grades are identified by a label on the shipping container. Consult LTC Marketing for parts specified with wider operating temperature ranges. 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/. Some packages are available in 500 unit reels through designated sales channels with #TRMPBF suffix. This product is only offered in trays. For more information go to: http://www.linear.com/packaging/ 6654fg For more information www.linear.com/LT6654 3 LT6654 Available Options OUTPUT VOLTAGE 1.25V INITIAL ACCURACY TEMPERATURE COEFFICIENT 10ppm/C 0.05% 20ppm/C 0.1% 10ppm/C 0.05% 20ppm/C 0.1% 10ppm/C 0.05% 20ppm/C 0.1% 10ppm/C 2.048V 0.05% 0.05% 10ppm/C 0.1% 20ppm/C 0.1% 20ppm/C 0.05% 10ppm/C 0.1% 20ppm/C 10ppm/C 2.5V 0.05% 0.1% 20ppm/C 0.05% 10ppm/C 0.05% 10ppm/C 0.1% 20ppm/C 0.1% 20ppm/C 0.05% 10ppm/C 0.1% 20ppm/C 3V 0.05% 10ppm/C 0.1% 20ppm/C 0.05% 10ppm/C 0.1% 20ppm/C 3.3V 0.05% 10ppm/C 0.1% 20ppm/C 0.05% 10ppm/C 0.1% 20ppm/C 10ppm/C 4.096V 0.05% 10ppm/C 0.05% 20ppm/C 0.1% 20ppm/C 0.1% 10ppm/C 0.05% 20ppm/C 0.1% 10ppm/C 5V 0.05% 20ppm/C 0.1% 10ppm/C 0.05% 10ppm/C 0.05% 20ppm/C 0.1% 20ppm/C 0.1% 10ppm/C 0.05% 20ppm/C 0.1% ** See the Order Information section for complete part number listing. 4 ORDER PART NUMBER** LT6654AIS6-1.25 LT6654BIS6-1.25 LT6654AHS6-1.25 LT6654BHS6-1.25 LT6654AMPS6-1.25 LT6654BMPS6-1.25 LT6654AHS6-2.048 LT6654AHLS8-2.048 LT6654BHS6-2.048 LT6654BHLS8-2.048 LT6654AMPS6-2.048 LT6654BMPS6-2.048 LT6654AIS6-2.5 LT6654BIS6-2.5 LT6654AHS6-2.5 LT6654AHLS8-2.5 LT6654BHS6-2.5 LT6654BHLS8-2.5 LT6654AMPS6-2.5 LT6654BMPS6-2.5 LT6654AHS6-3 LT6654BHS6-3 LT6654AMPS6-3 LT6654BMPS6-3 LT6654AHS6-3.3 LT6654BHS6-3.3 LT6654AMPS6-3.3 LT6654BMPS6-3.3 LT6654AHS6-4.096 LT6654AHLS8-4.096 LT6654BHS6-4.096 LT6654BHLS8-4.096 LT6654AMPS6-4.096 LT6654BMPS6-4.096 LT6654AIS6-5 LT6654BIS6-5 LT6654AHS6-5 LT6654AHLS8-5 LT6654BHS6-5 LT6654BHLS8-5 LT6654AMPS6-5 LT6654BMPS6-5 SPECIFIED TEMPERATURE RANGE -40C to 85C -40C to 85C -40C to 125C -40C to 125C -55C to 125C -55C to 125C -40C to 125C -40C to 125C -40C to 125C -40C to 125C -55C to 125C -55C to 125C -40C to 85C -40C to 85C -40C to 125C -40C to 125C -40C to 125C -40C to 125C -55C to 125C -55C to 125C -40C to 125C -40C to 125C -55C to 125C -55C to 125C -40C to 125C -40C to 125C -55C to 125C -55C to 125C -40C to 125C -40C to 125C -40C to 125C -40C to 125C -55C to 125C -55C to 125C -40C to 85C -40C to 85C -40C to 125C -40C to 125C -40C to 125C -40C to 125C -55C to 125C -55C to 125C 6654fg For more information www.linear.com/LT6654 LT6654 Electrical Characteristics The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25C, CL = 1F 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 LT6654AI LT6654BI LT6654AH LT6654BH LT6654AMP LT6654BMP l l l l -0.05 -0.10 -0.175 -0.35 -0.215 -0.43 -0.23 -0.46 Output Voltage Temperature Coefficient (Note 3) LT6654A LT6654B l l Line Regulation VOUT + 0.5V VIN 36V LT6654-2.048, LT6654-2.5, LT6654-3, LT6654-3.3, LT6654-4.096, LT6654-5 l 2.4V VIN 36V LT6654-1.25 l Load Regulation (Note 4) IOUT(SOURCE) = 10mA LT6654-2.048, LT6654-2.5, LT6654-3, LT6654-3.3, LT6654-4.096, LT6654-5 LT6654-1.25 TYP 1.2 5 10 ppm/V ppm/V 1.2 5 10 ppm/V ppm/V 3 8 15 15 20 30 45 ppm/mA ppm/mA ppm/mA ppm/mA ppm/mA ppm/mA 20 30 25 30 60 90 ppm/mA ppm/mA ppm/mA ppm/mA ppm/mA ppm/mA l 100 120 mV mV l l 450 50 mV mV 1.6 1.8 2.4 V V V 600 A A l 6 10 9 l 15 l LT6654LS8 30 l Minimum Input Voltage VIN - VOUT , VOUT = 0.1% IOUT = 0mA LT6654-2.048, LT6654-2.5, LT6654-3, LT6654-3.3, LT6654-4.096, LT6654-5 IOUT(SOURCE) = 10mA IOUT(SINK) = -10mA Supply Current 55 LT6654-1.25, VOUT = 0.1%, IOUT = 0mA LT6654-1.25, VOUT = 0.1%, IOUT = 10mA % % % % % % % % ppm/C ppm/C l Dropout Voltage (Note 5) 0.05 0.10 0.175 0.35 0.215 0.43 0.23 0.46 10 20 LT6654LS8 IOUT(SINK) = 10mA LT6654-2.048, LT6654-2.5, LT6654-3, LT6654-3.3, LT6654-4.096, LT6654-5 LT6654-1.25 UNITS 3 10 l Load Regulation (Note 4) MAX 1.5 l l No Load 350 l Output Short-Circuit Current Short VOUT to GND Short VOUT to VIN 40 30 mA mA Output Voltage Noise (Note 6) 0.1Hz f 10Hz LT6654-1.25 LT6654-2.048 LT6654-2.5 LT6654-3 LT6654-3.3 LT6654-4.096 LT6654-5 10Hz f 1kHz 0.8 1.0 1.5 1.6 1.7 2.0 2.2 2.0 ppmP-P ppmP-P ppmP-P ppmP-P ppmP-P ppmP-P ppmP-P ppmRMS Turn-On Time 0.1% Settling, CLOAD = 1F 150 s 6654fg For more information www.linear.com/LT6654 5 LT6654 Electrical Characteristics The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25C, CL = 1F and VIN = VOUT + 0.5V, unless otherwise noted. For LT6654-1.25, VIN = 2.4V, unless otherwise noted. PARAMETER CONDITIONS Long-Term Drift of Output Voltage (Note 7) LT6654S6 LT6654LS8 Hysteresis (Note 8) S6 T = 0C to 70C T = -40C to 85C T = -40C to 125C T = -55C to 125C LS8 T = 0C to 70C T = -40C to 85C T = -40C to 125C T = -55C to 125C 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: Temperature coefficient is measured by dividing the maximum change in output voltage by the specified temperature range. Note 4: Load regulation is measured on a pulse basis from no load to the specified load current. Output changes due to die temperature change must be taken into account separately. Note 5: Excludes load regulation errors. Note 6: Peak-to-peak noise is measured with a 1-pole highpass filter at 0.1Hz and 2-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 where the intrinsic noise of the instrument is removed to determine the actual noise of the device. 6 MIN TYP MAX UNITS 60 15 ppm/kHr ppm/kHr 15 30 40 50 ppm ppm ppm ppm 3 11 15 20 ppm ppm ppm ppm Note 7: 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 8: Hysteresis in output voltage is created by package 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. Hysteresis measures the maximum output change for the averages of three hot or cold temperature cycles. For instruments that are stored at well controlled temperatures (within 20 or 30 degrees of operational temperature), it is usually not a dominant error source. Typical hysteresis is the worst-case of 25C to cold to 25C or 25C to hot to 25C, preconditioned by one thermal cycle. Note 9: The stated temperature is typical for soldering of the leads during manual rework. For detailed IR reflow recommendations, refer to the Applications Information section. 6654fg For more information www.linear.com/LT6654 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 1.2510 OUTPUT IMPEDANCE () REFERENCE VOLTAGE (V) 1.2515 VIN 1V/DIV 1.2505 GND 1.2500 1.2495 VOUT 0.5V/DIV 1.2490 GND 1.2485 -60 -40 -20 0 20 40 60 80 100 120 140 TEMPERATURE (C) CLOAD = 1F CL = 1F 1 CL = 10F 0.1 0.01 0.1 6654 G02 20s/DIV 10 1 6654 G03 6654 G01 1.25V Load Regulation (Sourcing) 1.25V Load Regulation (Sinking) 1.25V Output Noise 0.1Hz to 10Hz 200 -55C 10 -40C 0 -10 125C -20 25C -30 -40 180 125C 160 140 120 100 25C 80 60 40 -40C 20 -50 0.1 -55C 0 0.1 10 1 OUTPUT CURRENT (mA) OUTPUT NOISE (1V/DIV) 20 OUTPUT VOLTAGE CHANGE (ppm) 30 OUTPUT VOLTAGE CHANGE (ppm) 1000 10 100 FREQUENCY (kHz) 6654 G04 0 10 1 OUTPUT CURRENT (mA) 1 2 3 4 5 6 7 TIME (1s/DIV) 1.25V Minimum Input Voltage (Sinking) 10 9 10 6654 G06 6654 G05 1.25V Minimum Input Voltage (Sourcing) 8 1.2V Output Voltage Noise Spectrum 400 10 350 25C -40C 1 -55C 125C NOISE VOLTAGE (nVHz) 125C OUTPUT CURRENT (mA) OUTPUT CURRENT (mA) 25C -55C 1 -40C 300 250 200 150 IO = 0A 100 IO = 5mA 50 0.1 1 1.2 1.4 1.6 1.8 2 2.2 MINIMUM INPUT VOLTAGE (V) 2.4 6654 G07 0.1 1 1.1 1.2 1.3 1.4 1.5 1.6 1.7 MINIMUM INPUT VOLTAGE (V) 1.8 6654 G08 0 0.01 0.1 1 10 FREQUENCY (kHz) 100 6654 G09 6654fg For more information www.linear.com/LT6654 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. 2.5V Output Voltage Temperature Drift THREE TYPICAL PARTS 2.5050 INPUT CURRENT (A) 2.501 2.500 2.499 2.5040 -40C 500 OUTPUT VOLTAGE (V) 2.5V Line Regulation 600 -55C 400 2.5030 OUTPUT VOLTAGE (V) 2.502 2.5V Supply Current vs Input Voltage 25C 300 125C 200 2.5020 2.5010 25C 2.5000 2.4990 125C 2.4980 -55C 2.4970 100 2.4960 2.498 -60 -20 20 60 100 TEMPERATURE (C) 0 140 0 5 10 15 20 25 30 INPUT VOLTAGE (V) 35 6654 G10 2.5V Load Regulation (Sourcing) 0 5 10 15 20 25 30 INPUT VOLTAGE (V) 40 35 6654 G12 2.5V Load Regulation (Sinking) 2.5V Output Noise 0.1Hz to 10Hz 180 -40C -10 125C 25C -20 -30 -40 0.1 1 OUTPUT CURRENT (mA) 160 140 OUTPUT NOISE (1V/DIV) -55C 0 OUTPUT VOLTAGE CHANGE (ppm) 120 100 125C 80 25C 60 40 -40C 20 0 0.1 10 -55C 10 1 OUTPUT CURRENT (mA) 6654 G14 6654 G13 2.5V Minimum VIN to VOUT Differential (Sourcing) 2.5V Minimum VIN to VOUT Differential (Sinking) 10 2.5V Output Voltage Noise Spectrum 10 -55C 400 25C 350 OUTPUT CURRENT (mA) -40C 125C 1 6654 G15 TIME (1s/DIV) -55C NOISE VOLTAGE (nVHz) OUTPUT VOLTAGE CHANGE (ppm) 2.4950 6654 G11 10 OUTPUT CURRENT (mA) 40 -40C -40C 125C 25C 1 300 250 IO = 0A 200 150 IO = 5mA 100 50 0.1 0 50 100 150 200 250 300 350 400 INPUT-OUTPUT VOLTAGE (mV) 6654 G16 8 0.1 50 -300 -250 -200 -150 -100 -50 0 INPUT-OUTPUT VOLTAGE (mV) 100 6654 G17 0 0.01 0.1 1 10 FREQUENCY (kHz) 100 6654 G18 6654fg For more information www.linear.com/LT6654 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 0.01 -30 -40 CL = 1F -50 -60 -70 CL = 10F -80 10 CL = 1F 1 1 0.1 1000 10 100 FREQUENCY (kHz) 6654 G19 1 1000 10 100 FREQUENCY (kHz) 6654 G20 2.5V Turn-On Characteristics 6654 G21 2.5V Load Transient Response (Sourcing) 2.5V Line Transient Response VIN 0.5V/DIV 3V/DC VIN 1V/DIV CL = 10F -90 -100 0.1 10 0.1 1 FREQUENCY (kHz) 100 OUTPUT IMPEDANCE () POWER SUPPLY REJECTION RATIO (dB) INTEGRATED NOISE (VRMS) 100 2.5V Output Impedance vs Frequency IOUT 0mA 5mA GND VOUT 2mV/DIV/AC 2.5V/DC VOUT 1V/DIV VOUT 20mV/DIV/AC 2.5V/DC GND 20s/DIV 6654 G22 CLOAD = 1F 2.5V Hysteresis Plot for -40C and 125C (TSOT-23) 48 44 150 OUTPUT VOLTAGE CHANGE (ppm) NUMBER OF UNITS 36 32 28 24 20 16 12 8 6 5 90 60 30 0 -30 -60 -90 -120 0 -150 -125 -100 -75 -50 -25 0 25 50 75 100 125 150 DISTRIBUTION (ppm) -150 6654 G24 50s/DIV 2.5V Hysteresis Plot for -40C and 125C (LS8) TA = 35C 120 4 6654 G25 CLOAD = 1F 2.5V Long Term Drift (TSOT-23) MAX AVG HOT CYCLE MAX AVG COLD CYCLE 25C TO 125C TO 25C 25C TO -40C TO 25C 40 6654 G23 50s/DIV NUMBER OF UNITS CLOAD = 1F 25C TO -40C TO 25C AND 25C TO 125C TO 25C 4 3 2 1 0 400 800 1200 TIME (HOURS) 1600 2000 6654 G26 0 -40 -30 -20 -10 0 10 20 DISTRIBUTION (ppm) 30 40 6654 G37 6654fg For more information www.linear.com/LT6654 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. 150 5.003 120 5.002 60 REFERENCE VOLTAGE (V) IOUT 5mA 90 0mA 30 PPM 5V Output Voltage Temperature Drift 2.5V Load Transient Response (Sinking) 2.5V Long Term Drift (LS8) 0 -30 VOUT 20mV/DIV/AC 2.5V/DC -60 -90 -120 -150 THREE TYPICAL PARTS 5.001 5.000 4.999 4.998 4.997 4.996 4.995 4.994 0 500 1500 1000 TIME (HOURS) 2000 6654 G27 50s/DIV CLOAD = 1F 4.993 -60 -40 -20 0 20 40 60 80 100 120 140 TEMPERATURE (C) 6654 G38 6654 G28 5V Output Impedance vs Frequency 5V Turn-On Characteristics 5V Load Regulation (Sourcing) VIN 2V/DIV GND VOUT 2V/DIV 50 OUTPUT VOLTAGE CHANGE (ppm) OUTPUT IMPEDANCE () 100 10 CL = 1F 1 CL = 10F 0.1 GND CLOAD = 1F 6654 G29 50s/DIV 0.01 0.1 1 30 20 -55C -40C 10 125C 0 25C -10 -20 0.1 1000 10 100 FREQUENCY (kHz) 40 1 OUTPUT CURRENT (mA) 6654 G30 5V Load Regulation (Sinking) 6654 G31 5V Minimum VIN to VOUT Differential (Sourcing) 5V Output Noise 0.1Hz to 10Hz 10 220 -55C 180 160 140 120 80 60 -55C -40C 125C 25C OUTPUT CURRENT (mA) OUTPUT NOISE (4V/DIV) OUTPUT VOLTAGE CHANGE (ppm) 200 100 10 25C -40C 125C 1 40 20 0 0.1 1 OUTPUT CURRENT (mA) 10 6654 G32 10 0 1 2 3 4 5 6 7 TIME (1s/DIV) 8 9 10 6654 G33 0.1 0 50 100 150 200 250 300 350 400 INPUT-OUTPUT VOLTAGE (mV) 6654 G34 6654fg For more information www.linear.com/LT6654 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. 5V Minimum VIN to VOUT Differential (Sinking) 5V Output Voltage Noise Spectrum 10 600 500 -55C NOISE VOLTAGE (nVHz) OUTPUT CURRENT (mA) 550 25C 125C -40C 1 IO = 0A 450 400 350 300 250 IO = 5mA 200 150 100 50 0.1 -300 -250 -200 -150 -100 -50 0 50 INPUT-OUTPUT VOLTAGE (mV) 0 0.01 100 0.1 1 10 FREQUENCY (kHz) 100 6654 G36 6654 G35 Pin Functions (LS8) (TSOT) DNC (Pins 1, 7): Do Not Connect. Keep leakage current from this pin to VIN or GND to a minimum. GND (Pin 1): Internal Function. This pin must be tied to ground, near Pin 2. NC (Pin 2): Not internally connected. May be tied to VIN, VOUT, GND or floated. GND (Pin 2): Primary Device Ground. GND (Pin 3): Internal Function. This pin must be tied to GND near Pin 4. GND (Pin 4): Primary Device Ground. Pin 3 and the load ground should be star-connected to Pin 4. VOUT (Pin 5): VOUT Pin. An output capacitor of 1F or greater is required for stable operation. VOUT (Pin 6): VOUT Pin. Tie to Pin 5 for proper load regulation. DNC (Pin 3): Do Not Connect. Keep leakage current from this pin to VIN or GND to a minimum. VIN (Pin 4): Power Supply. Bypass VIN with a 0.1F capacitor to ground. DNC (Pin 5): Do Not Connect. Keep leakage current from this pin to VIN or GND to a minimum. VOUT (Pin 6): Output Voltage. An output capacitor of 1F minimum is required for stable operation. VIN (Pin 8): Power Supply. Bypass VIN with a 0.1F, or larger, capacitor to GND. 6654fg For more information www.linear.com/LT6654 11 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 12 6654fg For more information www.linear.com/LT6654 LT6654 Applications Information Bypass and Load Capacitors The LT6654 voltage references should have an input bypass capacitor of 0.1F 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 10s (i.e. 10 and 1F) is recommended. These references also require an output capacitor for stability. The optimum output capacitance for most applications is 1F, although larger values work as well. This capacitor affects the turn-on and settling time for the output to reach its final value. VIN 1V/DIV GND VOUT 1V/DIV GND CLOAD = 1F 6654 F01 20s/DIV Figure 1. Turn-On Characteristics of LT6654-2.5 Figure 1 shows the turn-on time for the LT6654-2.5 with a 0.1F input bypass and 1F load capacitor. Figure 2 shows the output response to a 0.5V transient on VIN with the same capacitors. VIN 0.5V/DIV 3V/DC The test circuit of Figure 3 is used to measure the stability with various load currents. With RL = 1k, the 1V step produces a current step of 1mA. Figure 4 shows the response to a 0.5mA load. Figure 5 is the output response to a sourcing step from 4mA to 5mA, and Figure 6 is the output response of a sinking step from 4mA to 5mA. VOUT 2mV/DIV/AC 2.5V/DC CLOAD = 1F 6654 F02 50s/DIV Figure 2. Output Response to 0.5V Ripple on VIN VIN 3V IN CIN 0.1F LT6654-2.5 OUT GND 1k CL 1F 1V VGEN 6654 F03 Figure 3. Load Current Response Time Test Circuit 6654fg For more information www.linear.com/LT6654 13 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 = 1F 50s/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. In this configuration, a positive voltage is required at VIN (Pin 4) to bias the LT6654 internal circuitry. This voltage must be current limited with R1 to keep the output PNP transistor from turning on and driving the grounded output. C1 provides stability during load transients. This connection maintains the same accuracy and temperature coefficient of the positive connected LT6654. R1 4.7k IOUT 4mA IN OUT LT6654-2.5 GND 5mA 3V 0.1F VOUT = -2.5V VOUT 10mV/DIV/AC 2.5V/DC V - VOUT R EE 550A + IOUT C1 1F VEE CLOAD = 1F 50s/DIV 6654 F07 Figure 7. Using the LT6654-2.5 to Build a -2.5V Reference 6654 F05 Figure 5. LT6654-2.5 Sourcing 4mA to 5mA IOUT -5mA -4mA VOUT 10mV/DIV/AC 2.5V/DC CLOAD = 1F 50s/DIV 6654 F06 Figure 6. LT6654-2.5 Sinking 4mA to 5mA 14 6654fg For more information www.linear.com/LT6654 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. The boards were then placed into a constant temperature oven with TA = 35C, their outputs scanned regularly and measured with an 8.5 digit DVM. Long-term drift curves are shown in Figure 8. Their drift is much smaller after the first thousand hours. OUTPUT VOLTAGE CHANGE (ppm) 80 40 0 -40 -80 0 200 400 600 TIME (HOURS) LT6654-2.5 S6 PACKAGE FIRST THOUSAND HOURS 40 0 -40 -80 1000 1000 800 2000 1400 1600 1800 TIME (HOURS) 6654 F08b LT6654-2.5 S6 PACKAGE SECOND THOUSAND HOURS (NORMALIZED TO THE FIRST THOUSAND HOURS) 6654 F08a 1200 80 40 PPM OUTPUT VOLTAGE CHANGE (ppm) 80 0 -40 -80 1000 1500 TIME (HOURS) LT6654-2.5 LS8 PACKAGE 0 500 2000 6654 G38 Figure 8. LT6654-2.5 Long Term Drift 6654fg For more information www.linear.com/LT6654 15 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 = 150C JA = 192C/W 0.6 335mW 0.35 POWER (W) 0.30 0.25 10mA LOAD 0.20 0.15 0.10 0.05 0 NO LOAD 5 0 10 15 20 25 VIN (V) 30 35 40 6654 F10 Figure 10. Typical Power Dissipation of the LT6654 50 MAX AVG HOT CYCLE MAX AVG COLD CYCLE 25C TO 125C TO 25C 25C TO -40C TO 25C 40 NUMBER OF UNITS The power dissipation in the LT6654 is dependent on VIN, load current and the package. The LT6654 package has a thermal resistance, or JA, of 192C/W. A curve that illustrates allowed power dissipation versus temperature for the 6-lead SOT-23 package is shown in Figure 9. The power dissipation of the LT6654-2.5 as a function of input voltage is shown in Figure 10. The top curve shows power dissipation with a 10mA load and the bottom curve shows power dissipation with no load. When operated within its specified limits of VIN = 36V and sourcing 10mA, the LT6654-2.5 consumes about 335mW at room temperature. The power-derating curve in Figure 9 shows the LT66542.5 can only safely dissipate 130mW at 125C, which is less than its maximum power output. Care must be taken when designing the circuit so that the maximum junction temperature is not exceeded. For best performance, junction temperature should be kept below 125C. 30 20 10 0 -150 -100 -50 0 50 100 DISTRIBUTION (ppm) 150 6654 F11 Figure 11a. LT6654 S6 Thermal Hysteresis -40C to 125C 6 0.4 0.3 0.2 0.1 0 0 20 40 60 80 100 TEMPERATURE (C) 120 25C TO -40C TO 25C AND 25C TO 125C TO 25C 5 130mW 140 6654 F09 Figure 9. Maximum Allowed Power Dissipation of the LT6654 NUMBER OF UNITS POWER (W) 0.5 4 3 2 1 0 -40 -30 -20 -10 0 10 20 DISTRIBUTION (ppm) 30 40 6654 F11b Figure 11b. LT6654 LS8 Thermal Hysteresis -40C to 125C 16 6654fg For more information www.linear.com/LT6654 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 64C. This could increase the junction temperature above 125C (TJMAX is 150C) and may cause the output to shift due to thermal hysteresis. Plastic mould compounds absorb water. With changes in relative humidity, plastic packaging materials change the amount of pressure they apply to the die inside, which can cause slight changes in the output of a voltage reference, usually on the order of 100ppm. The LS8 package is hermetic, so it is not affected by humidity, and is therefore more stable in environments where humidity may be a concern. 300 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. These two changes are not correlated. For example, the voltage may shift but the temperature coefficient may not. To reduce the effects of stress-related shifts, mount 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. TEMPERATURE (C) PC Board Layout TP = 260C TL = 217C TS(MAX) = 200C TS = 190C 225 RAMP DOWN tP 30s T = 150C 150 tL 130s RAMP TO 150C 75 40s 120s 0 The capacitors should be mounted close to the LT6654. The GND and VOUT traces should be as short as possible to minimize I * R drops, since high trace resistance directly impacts load regulation. 0 2 4 6 MINUTES 10 8 6654 F12 Figure 12. Lead Free Reflow Profile 14 IR Reflow Shift NUMBER OF UNITS 12 The different expansion and contraction rates of the materials that make up the LT6654 package may cause the output voltage to shift after undergoing IR reflow. Lead free solder reflow profiles reach over 250C, considerably more than with lead based solder. A typical lead free IR reflow profile is shown in Figure 12. Similar profiles are found using a convection reflow oven. LT6654 devices run up to three times through this reflow process show that the standard deviation of the output voltage increases with a slight negative mean shift of 0.003% as shown in Figure 13. While there can be up to 0.014% of output voltage shift, the overall drift of the LT6654 after IR reflow does not vary significantly. 380s 260C 3 CYCLES 260C 1 CYCLE LT6654S6 10 8 6 4 2 0 -140 -120 -100 -80 -60 -40 -20 CHANGE IN OUTPUT (ppm) 0 6654 F13 Figure 13. Output Voltage Shift Due to IR Reflow (%) 6654fg For more information www.linear.com/LT6654 17 LT6654 Typical Applications Extended Supply Range Reference Boosted Output Current Reference 4.5V < VIN < 36V UP TO 160V 4.7F 220 330k MMBT5551 BZX84C12 2N2905 IN IN LT6654-2.5 OUT 0.1F GND IOUT UP TO 300mA LT6654-2.5 OUT GND 1F 1F 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* 4.7F 220 0.1F 10 GND OUT VIN 10F 2 VREF 2N2905 VCC CS LT6654-2.5 IN GND IOUT UP TO 100mA OUT 1F SCK 0.1F DAC A LTC2600 DAC B SDI DAC C CLEAR DAC D DAC E 6654 TA04 DAC F *LED CANNOT BE OMMITTED THE LED CLAMPS THE VOLTAGE DROP ACROSS THE 220 AND LIMITS OUTPUT CURRENT DAC G GND DAC H 6654 TA05 18 6654fg For more information www.linear.com/LT6654 LT6654 Package Description Please refer to http://www.linear.com/product/LT6654#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. 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 1.90 BSC S6 TSOT-23 0302 6654fg For more information www.linear.com/LT6654 19 LT6654 Package Description Please refer to http://www.linear.com/product/LT6654#packaging for the most recent package drawings. LS8 Package 8-Pin Leadless Chip Carrier (5mm x 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 x 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 0.10 8 1 PIN 1 TOP MARK (SEE NOTE 5) 2 PACKAGE IN TRAY LOADING ORIENTATION 5.00 SQ 0.15 8 R0.20 REF 2.00 REF 7 6 1 7 2 2.54 0.15 0.5 6 4.20 0.10 1.4 3 5 R0.20 REF 5 3 1.00 x 7 TYP 4 0.70 TYP NOTE: 1. ALL DIMENSIONS ARE IN MILLIMETERS 2. DRAWING NOT TO SCALE 3. DIMENSIONS PACKAGE DO NOT INCLUDE PLATING BURRS PLATING BURRS, IF PRESENT, SHALL NOT EXCEED 0.30mm ON ANY SIDE 4. PLATING--ELECTO NICKEL MIN 1.25UM, ELECTRO GOLD MIN 0.30UM 5. SHADED AREA IS ONLY A REFERENCE FOR PIN 1 LOCATION ON THE TOP AND BOTTOM OF PACKAGE 20 LS8 0113 REV B 4 0.10 TYP 0.64 x 8 TYP 6654fg For more information www.linear.com/LT6654 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. 2/14 12/15 G 03/17 9, 15, 16 20 Schematics updated to refer to pin functions instead of pin numbers. GND label added on all schematic references of LT6654. F 6 17 The pin descriptions of Pin 2, Pin 3 and Pin 4 on LS8 package changed. 6/15 1, 2, 4 Addition of LS8 Package Description. Label of Pin 2 on LS8 package changed to NC. E 4 Addition of Humidity Sensitivity Information. Addition of Related Parts. D 1-18 SOT-23 removed from data sheet title. Order Information updated to include 2.048V, 4.096V and 5V option in LS8 package. Part marking correction for 4.096V options in TSOT-23 package. Web link to Package Description updated. Added 2.5V option in I-temp grade. 22 1, 13, 14, 18 2, 11, 12 11 18, 22 1 3, 4 3 19, 20 2-5 6654fg 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 representaFor more information www.linear.com/LT6654 tion that the interconnection of its circuits as described herein will not infringe on existing patent rights. 21 LT6654 Typical Application 16-Bit ADC Reference 4.6V < VS < 36V LT6654-4.096 IN OUT GND 10F 0.1F + 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, 2.5V, 5V and 10V Versions, MSOP, PDIP, S0-8, SOT-23 and TO-92 Packages LT1461 Micropower Precision LDO Series Reference 3ppm/C Max Drift, 0C to 70C, -40C to 85C, -40C to 125C Options in SO-8 LT1790 Micropower Precision Series References 0.05% Max, 10ppm/C Max, 60A Supply, SOT-23 Package LT6650 Micropower Reference with Buffer Amplifier 0.05% Max, 5.6A Supply, SOT-23 Package LTC6652 Precision Low Drift Low Noise Buffered Reference 0.5% Max, 5ppm/C Max, 2.1ppmP-P Noise (0.1Hz to 10Hz) 100% Tested at -40C, 25C and 125C LT6660 Tiny Micropower Series Reference 0.2% Max, 20ppm/C Max, 20mA Output Current, 2mm x 2mm DFN LTC6655 Precision Low Noise Reference 2ppm/C Max, 650nVP-P Noise (0.1Hz to 10Hz) 100% Tested at -40C, 25C and 125C LT6656 800nA Precision Voltage Reference 800nA, 10ppm/C Max, 0.05% Max, SOT-23 Package 22 Linear Technology Corporation 1630 McCarthy Blvd., Milpitas, CA 95035-7417 For more information www.linear.com/LT6654 (408) 432-1900 FAX: (408) 434-0507 www.linear.com/LT6654 6654fg LT 0317 REV G * PRINTED IN USA LINEAR TECHNOLOGY CORPORATION 2010