LT6654 Precision Wide Supply High Output Drive Low Noise Reference FeaTures DescripTion n Low Drift: The LT®6654 is a family of small precision voltage ref- n A-Grade: 10ppm/°C Max erences that offers high accuracy, low noise, low drift, n B-Grade: 20ppm/°C Max low dropout and low power. The LT6654 operates from n High Accuracy: voltages up to 36V and is fully specified from –55°C to n A-Grade: ±0.05% Max 125°C. A buffered output ensures ±10mA of output drive n B-Grade: ±0.10% Max with low output impedance and precise load regulation. n Low Noise: 1.6ppm (0.1Hz to 10Hz) These features, in combination, make the LT6654 ideal P-P n Wide Supply Range to 36V for portable equipment, industrial sensing and control, n Low Thermal Hysteresis: LS8 15ppm (–40°C to 125°C) and automotive applications. n Long Term Drift: (LS8) 15ppm/√kHr The LT6654 was designed with advanced manufactur- n Line Regulation (Up to 36V): 5ppm/V Max ing techniques and curvature compensation to provide n Low Dropout Voltage: 100mV Max 10ppm/°C temperature drift and 0.05% initial accuracy. n Sinks and Sources ±10mA Low thermal hysteresis ensures high accuracy and n Load Regulation at 10mA: 8ppm/mA Max 1.6ppm noise minimizes measurement uncertainty. n Fully Specified from –55°C to 125°C P-P Since the LT6654 can also sink current, it can operate n Available Output Voltage Options: 1.25V, 2.048V, as a low power negative voltage reference with the same 2.5V, 3V, 3.3V, 4.096V, 5V precision as a positive reference. n Low Profile (1mm) ThinSOT™ Package and 5mm × 5mm Surface Mount Hermetic Package The LT6654 references are offered in 6-lead SOT-23 package and an 8-lead LS8 package. The LS8 is a 5mm applicaTions × 5mm surface mount hermetic package that provides n Automotive Control and Monitoring outstanding stability. n High Temperature Industrial L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and n High Resolution Data Acquisition Systems ThinSOT is a trademark of Analog Devices, Inc. All other trademarks are the property of their respective owners. n Instrumentation and Process Control n Precision Regulators n Medical Equipment Typical applicaTion Output Voltage Temperature Drift 0.10 3 TYPICAL PARTS Basic Connection LT6654-2.5 0.05 %) (VOUT + 0.5V) < VIN < 36V IN LT6654 OUT VOUT Y ( C 0C.I1Nµ F GND 1CµLF CURA 0.00 C A 6654 TA01a UT O V –0.05 –0.10 –60–40–20 0 20 40 60 80 100120140 TEMPERATURE (°C) 6654 TA01b 6654fh 1 For more information www.linear.com/LT6654

LT6654 absoluTe MaxiMuM raTings (Note 1) Input Voltage V to GND ...........................–0.3V to 38V Operating Temperature Range ...............–55°C to 125°C IN Output Voltage V ........................–0.3V to V + 0.3V Storage Temperature Range (Note 2) .....–65°C to 150°C OUT IN Output Short-Circuit Duration .........................Indefinite Lead Temperature (Soldering, 10 sec.) Specified Temperature Range (Note 9) .................................................................300°C I-Grade.................................................–40°C to 85°C H-Grade .............................................–40°C to 125°C MP-Grade ..........................................–55°C to 125°C pin conFiguraTion TOP VIEW VIN TOP VIEW 8 DNC 1 7 DNC GND* 1 6 VOUT GND 2 5 DNC NC 2 6 VOUT DNC 3 4 VIN GND 3 5 VOUT 4 S6 PACKAGE 6-LEAD PLASTIC TSOT-23 GND* TJMAX = 150°C, θJA = 192°C/W LS8 PACKAGE DNC: CONNECTED INTERNALLY 8-PIN LEADLESS CHIP CARRIER (5mm × 5mm) DO NOT CONNECT EXTERNAL CIRCUITRY TO THESE PINS TJMAX = 150°C, θJA = 125°C/W *CONNECT PIN TO DEVICE GND (PIN 2) DNC: CONNECTED INTERNALLY DO NOT CONNECT EXTERNAL CIRCUITRY TO THESE PINS *CONNECT PIN TO DEVICE GND (PIN 3) 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 LT6654AIS6-1.25#TRMPBF LT6654AIS6-1.25#TRPBF LTFVD 6-Lead Plastic TSOT-23 –40°C to 85°C LT6654BIS6-1.25#TRMPBF LT6654BIS6-1.25#TRPBF LTFVD 6-Lead Plastic TSOT-23 –40°C to 85°C LT6654AHS6-1.25#TRMPBF LT6654AHS6-1.25#TRPBF LTFVD 6-Lead Plastic TSOT-23 –40°C to 125°C LT6654BHS6-1.25#TRMPBF LT6654BHS6-1.25#TRPBF LTFVD 6-Lead Plastic TSOT-23 –40°C to 125°C LT6654AMPS6-1.25#TRMPBF LT6654AMPS6-1.25#TRPBF LTFVD 6-Lead Plastic TSOT-23 –55°C to 125°C LT6654BMPS6-1.25#TRMPBF LT6654BMPS6-1.25#TRPBF LTFVD 6-Lead Plastic TSOT-23 –55°C to 125°C LT6654AIS6-2.048#TRMPBF LT6654AIS6-2.048#TRPBF LTFVF 6-Lead Plastic TSOT-23 –40°C to 85°C LT6654BIS6-2.048#TRMPBF LT6654BIS6-2.048#TRPBF LTFVF 6-Lead Plastic TSOT-23 –40°C to 85°C LT6654AHS6-2.048#TRMPBF LT6654AHS6-2.048#TRPBF LTFVF 6-Lead Plastic TSOT-23 –40°C to 125°C LT6654BHS6-2.048#TRMPBF LT6654BHS6-2.048#TRPBF LTFVF 6-Lead Plastic TSOT-23 –40°C to 125°C LT6654AMPS6-2.048#TRMPBF LT6654AMPS6-2.048#TRPBF LTFVF 6-Lead Plastic TSOT-23 –55°C to 125°C LT6654BMPS6-2.048#TRMPBF LT6654BMPS6-2.048#TRPBF LTFVF 6-Lead Plastic TSOT-23 –55°C to 125°C LT6654AIS6-2.5#TRMPBF LT6654AIS6-2.5#TRPBF LTFJY 6-Lead Plastic TSOT-23 –40°C to 85°C LT6654BIS6-2.5#TRMPBF LT6654BIS6-2.5#TRPBF LTFJY 6-Lead Plastic TSOT-23 –40°C to 85°C 6654fh 2 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 LT6654AHS6-2.5#TRMPBF LT6654AHS6-2.5#TRPBF LTFJY 6-Lead Plastic TSOT-23 –40°C to 125°C LT6654BHS6-2.5#TRMPBF LT6654BHS6-2.5#TRPBF LTFJY 6-Lead Plastic TSOT-23 –40°C to 125°C LT6654AMPS6-2.5#TRMPBF LT6654AMPS6-2.5#TRPBF LTFJY 6-Lead Plastic TSOT-23 –55°C to 125°C LT6654BMPS6-2.5#TRMPBF LT6654BMPS6-2.5#TRPBF LTFJY 6-Lead Plastic TSOT-23 –55°C to 125°C LT6654AIS6-3#TRMPBF LT6654AIS6-3#TRPBF LTFVG 6-Lead Plastic TSOT-23 –40°C to 85°C LT6654BIS6-3#TRMPBF LT6654BIS6-3#TRPBF LTFVG 6-Lead Plastic TSOT-23 –40°C to 85°C LT6654AHS6-3#TRMPBF LT6654AHS6-3#TRPBF LTFVG 6-Lead Plastic TSOT-23 –40°C to 125°C LT6654BHS6-3#TRMPBF LT6654BHS6-3#TRPBF LTFVG 6-Lead Plastic TSOT-23 –40°C to 125°C LT6654AMPS6-3#TRMPBF LT6654AMPS6-3#TRPBF LTFVG 6-Lead Plastic TSOT-23 –55°C to 125°C LT6654BMPS6-3#TRMPBF LT6654BMPS6-3#TRPBF LTFVG 6-Lead Plastic TSOT-23 –55°C to 125°C LT6654AIS6-3.3#TRMPBF LT6654AIS6-3.3#TRPBF LTFVH 6-Lead Plastic TSOT-23 –40°C to 85°C LT6654BIS6-3.3#TRMPBF LT6654BIS6-3.3#TRPBF LTFVH 6-Lead Plastic TSOT-23 –40°C to 85°C LT6654AHS6-3.3#TRMPBF LT6654AHS6-3.3#TRPBF LTFVH 6-Lead Plastic TSOT-23 –40°C to 125°C LT6654BHS6-3.3#TRMPBF LT6654BHS6-3.3#TRPBF LTFVH 6-Lead Plastic TSOT-23 –40°C to 125°C LT6654AMPS6-3.3#TRMPBF LT6654AMPS6-3.3#TRPBF LTFVH 6-Lead Plastic TSOT-23 –55°C to 125°C LT6654BMPS6-3.3#TRMPBF LT6654BMPS6-3.3#TRPBF LTFVH 6-Lead Plastic TSOT-23 –55°C to 125°C LT6654AIS6-4.096#TRMPBF LT6654AIS6-4.096#TRPBF LTFVJ 6-Lead Plastic TSOT-23 –40°C to 85°C LT6654BIS6-4.096#TRMPBF LT6654BIS6-4.096#TRPBF LTFVJ 6-Lead Plastic TSOT-23 –40°C to 85°C LT6654AHS6-4.096#TRMPBF LT6654AHS6-4.096#TRPBF LTFVJ 6-Lead Plastic TSOT-23 –40°C to 125°C LT6654BHS6-4.096#TRMPBF LT6654BHS6-4.096#TRPBF LTFVJ 6-Lead Plastic TSOT-23 –40°C to 125°C LT6654AMPS6-4.096#TRMPBF LT6654AMPS6-4.096#TRPBF LTFVJ 6-Lead Plastic TSOT-23 –55°C to 125°C LT6654BMPS6-4.096#TRMPBF LT6654BMPS6-4.096#TRPBF LTFVJ 6-Lead Plastic TSOT-23 –55°C to 125°C LT6654AIS6-5#TRMPBF LT6654AIS6-5#TRPBF LTFVK 6-Lead Plastic TSOT-23 –40°C to 85°C LT6654BIS6-5#TRMPBF LT6654BIS6-5#TRPBF LTFVK 6-Lead Plastic TSOT-23 –40°C to 85°C LT6654AHS6-5#TRMPBF LT6654AHS6-5#TRPBF LTFVK 6-Lead Plastic TSOT-23 –40°C to 125°C LT6654BHS6-5#TRMPBF LT6654BHS6-5#TRPBF LTFVK 6-Lead Plastic TSOT-23 –40°C to 125°C LT6654AMPS6-5#TRMPBF LT6654AMPS6-5#TRPBF LTFVK 6-Lead Plastic TSOT-23 –55°C to 125°C LT6654BMPS6-5#TRMPBF LT6654BMPS6-5#TRPBF LTFVK 6-Lead Plastic TSOT-23 –55°C to 125°C LEAD FREE FINISH† PART MARKING* PACKAGE DESCRIPTION SPECIFIED TEMPERATURE RANGE LT6654AHLS8-2.048#PBF 542048 8-Lead Ceramic LCC (5mm × 5mm) –40°C to 125°C LT6654BHLS8-2.048#PBF 542048 8-Lead Ceramic LCC (5mm × 5mm) –40°C to 125°C LT6654AHLS8-2.5#PBF 665425 8-Lead Ceramic LCC (5mm × 5mm) –40°C to 125°C LT6654BHLS8-2.5#PBF 665425 8-Lead Ceramic LCC (5mm × 5mm) –40°C to 125°C LT6654AHLS8-4.096#PBF 544096 8-Lead Ceramic LCC (5mm × 5mm) –40°C to 125°C LT6654BHLS8-4.096#PBF 544096 8-Lead Ceramic LCC (5mm × 5mm) –40°C to 125°C LT6654AHLS8-5#PBF 66545 8-Lead Ceramic LCC (5mm × 5mm) –40°C to 125°C LT6654BHLS8-5#PBF 66545 8-Lead Ceramic LCC (5mm × 5mm) –40°C to 125°C 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/ 6654fh 3 For more information www.linear.com/LT6654

LT6654 available opTions OUTPUT VOLTAGE INITIAL ACCURACY TEMPERATURE COEFFICIENT ORDER PART NUMBER** SPECIFIED TEMPERATURE RANGE 1.25V 0.05% 10ppm/°C LT6654AIS6-1.25 –40°C to 85°C 0.1% 20ppm/°C LT6654BIS6-1.25 –40°C to 85°C 0.05% 10ppm/°C LT6654AHS6-1.25 –40°C to 125°C 0.1% 20ppm/°C LT6654BHS6-1.25 –40°C to 125°C 0.05% 10ppm/°C LT6654AMPS6-1.25 –55°C to 125°C 0.1% 20ppm/°C LT6654BMPS6-1.25 –55°C to 125°C 2.048V 0.05% 10ppm/°C LT6654AIS6-2.048 –40°C to 85°C 0.1% 20ppm/°C LT6654BIS6-2.048 –40°C to 85°C 0.05% 10ppm/°C LT6654AHS6-2.048 –40°C to 125°C 0.05% 10ppm/°C LT6654AHLS8-2.048 –40°C to 125°C 0.1% 20ppm/°C LT6654BHS6-2.048 –40°C to 125°C 0.1% 20ppm/°C LT6654BHLS8-2.048 –40°C to 125°C 0.05% 10ppm/°C LT6654AMPS6-2.048 –55°C to 125°C 0.1% 20ppm/°C LT6654BMPS6-2.048 –55°C to 125°C 2.5V 0.05% 10ppm/°C LT6654AIS6-2.5 –40°C to 85°C 0.1% 20ppm/°C LT6654BIS6-2.5 –40°C to 85°C 0.05% 10ppm/°C LT6654AHS6-2.5 –40°C to 125°C 0.05% 10ppm/°C LT6654AHLS8-2.5 –40°C to 125°C 0.1% 20ppm/°C LT6654BHS6-2.5 –40°C to 125°C 0.1% 20ppm/°C LT6654BHLS8-2.5 –40°C to 125°C 0.05% 10ppm/°C LT6654AMPS6-2.5 –55°C to 125°C 0.1% 20ppm/°C LT6654BMPS6-2.5 –55°C to 125°C 3V 0.05% 10ppm/°C LT6654AIS6-3 –40°C to 85°C 0.1% 20ppm/°C LT6654BIS6-3 –40°C to 85°C 0.05% 10ppm/°C LT6654AHS6-3 –40°C to 125°C 0.1% 20ppm/°C LT6654BHS6-3 –40°C to 125°C 0.05% 10ppm/°C LT6654AMPS6-3 –55°C to 125°C 0.1% 20ppm/°C LT6654BMPS6-3 –55°C to 125°C 3.3V 0.05% 10ppm/°C LT6654AIS6-3.3 –40°C to 85°C 0.1% 20ppm/°C LT6654BIS6-3.3 –40°C to 85°C 0.05% 10ppm/°C LT6654AHS6-3.3 –40°C to 125°C 0.1% 20ppm/°C LT6654BHS6-3.3 –40°C to 125°C 0.05% 10ppm/°C LT6654AMPS6-3.3 –55°C to 125°C 0.1% 20ppm/°C LT6654BMPS6-3.3 –55°C to 125°C 4.096V 0.05% 10ppm/°C LT6654AIS6-4.096 –40°C to 85°C 0.1% 20ppm/°C LT6654BIS6-4.096 –40°C to 85°C 0.05% 10ppm/°C LT6654AHS6-4.096 –40°C to 125°C 0.05% 10ppm/°C LT6654AHLS8-4.096 –40°C to 125°C 0.1% 20ppm/°C LT6654BHS6-4.096 –40°C to 125°C 0.1% 20ppm/°C LT6654BHLS8-4.096 –40°C to 125°C 0.05% 10ppm/°C LT6654AMPS6-4.096 –55°C to 125°C 0.1% 20ppm/°C LT6654BMPS6-4.096 –55°C to 125°C 5V 0.05% 10ppm/°C LT6654AIS6-5 –40°C to 85°C 0.1% 20ppm/°C LT6654BIS6-5 –40°C to 85°C 0.05% 10ppm/°C LT6654AHS6-5 –40°C to 125°C 0.05% 10ppm/°C LT6654AHLS8-5 –40°C to 125°C 0.1% 20ppm/°C LT6654BHS6-5 –40°C to 125°C 0.1% 20ppm/°C LT6654BHLS8-5 –40°C to 125°C 0.05% 10ppm/°C LT6654AMPS6-5 –55°C to 125°C 0.1% 20ppm/°C LT6654BMPS6-5 –55°C to 125°C ** See the Order Information section for complete part number listing. 6654fh 4 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 T = 25°C, C = 1µF and V = V + 0.5V, unless otherwise noted. A L IN OUT For LT6654-1.25, V = 2.4V, unless otherwise noted. IN PARAMETER CONDITIONS MIN TYP MAX UNITS Output Voltage Accuracy LT6654A –0.05 0.05 % LT6654B –0.10 0.10 % LT6654AI l –0.175 0.175 % LT6654BI l –0.35 0.35 % LT6654AH l –0.215 0.215 % LT6654BH l –0.43 0.43 % LT6654AMP l –0.23 0.23 % LT6654BMP l –0.46 0.46 % Output Voltage Temperature Coefficient (Note 3) LT6654A l 3 10 ppm/°C LT6654B l 10 20 ppm/°C Line Regulation V + 0.5V ≤ V ≤ 36V OUT IN LT6654-2.048, LT6654-2.5, LT6654-3, 1.2 5 ppm/V LT6654-3.3, LT6654-4.096, LT6654-5 l 10 ppm/V 2.4V ≤ V ≤ 36V 1.2 5 ppm/V IN LT6654-1.25 l 10 ppm/V Load Regulation (Note 4) I = 10mA OUT(SOURCE) LT6654-2.048, LT6654-2.5, LT6654-3, 3 8 ppm/mA LT6654-3.3, LT6654-4.096, LT6654-5 l 15 ppm/mA LT6654-1.25 6 15 ppm/mA l 20 ppm/mA LT6654LS8 10 30 ppm/mA l 45 ppm/mA Load Regulation (Note 4) I = 10mA OUT(SINK) LT6654-2.048, LT6654-2.5, LT6654-3, 9 20 ppm/mA LT6654-3.3, LT6654-4.096, LT6654-5 l 30 ppm/mA LT6654-1.25 15 25 ppm/mA l 30 ppm/mA LT6654LS8 30 60 ppm/mA l 90 ppm/mA Dropout Voltage (Note 5) V – V , ∆V = 0.1% IN OUT OUT I = 0mA 55 100 mV OUT LT6654-2.048, LT6654-2.5, LT6654-3, l 120 mV LT6654-3.3, LT6654-4.096, LT6654-5 I = 10mA l 450 mV OUT(SOURCE) I = –10mA l 50 mV OUT(SINK) Minimum Input Voltage LT6654-1.25, ∆V = 0.1%, I = 0mA 1.5 1.6 V OUT OUT l 1.8 V LT6654-1.25, ∆V = 0.1%, I = ±10mA l 2.4 V OUT OUT Supply Current No Load 350 µA l 600 µA Output Short-Circuit Current Short V to GND 40 mA OUT Short V to V 30 mA OUT IN Output Voltage Noise (Note 6) 0.1Hz ≤ f ≤ 10Hz LT6654-1.25 0.8 ppm P-P LT6654-2.048 1.0 ppm P-P LT6654-2.5 1.5 ppm P-P LT6654-3 1.6 ppm P-P LT6654-3.3 1.7 ppm P-P LT6654-4.096 2.0 ppm P-P LT6654-5 2.2 ppm P-P 10Hz ≤ f ≤ 1kHz 2.0 ppm RMS Turn-On Time 0.1% Settling, C = 1µF 150 µs LOAD 6654fh 5 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 T = 25°C, C = 1µF and V = V + 0.5V, unless otherwise noted. A L IN OUT For LT6654-1.25, V = 2.4V, unless otherwise noted. IN PARAMETER CONDITIONS MIN TYP MAX UNITS Long-Term Drift of Output Voltage (Note 7) LT6654S6 60 ppm/√kHr LT6654LS8 15 ppm/√kHr Hysteresis (Note 8) S6 ∆T = 0°C to 70°C 15 ppm ∆T = –40°C to 85°C 30 ppm ∆T = –40°C to 125°C 40 ppm ∆T = –55°C to 125°C 50 ppm LS8 ∆T = 0°C to 70°C 3 ppm ∆T = –40°C to 85°C 11 ppm ∆T = –40°C to 125°C 15 ppm ∆T = –55°C to 125°C 20 ppm Note 1: Stresses beyond those listed under Absolute Maximum Ratings Note 7: Long-term stability typically has a logarithmic characteristic may cause permanent damage to the device. Exposure to any Absolute and therefore, changes after 1000 hours tend to be much smaller than Maximum Rating condition for extended periods may affect device before that time. Total drift in the second thousand hours is normally less reliability and lifetime. than one third that of the first thousand hours with a continuing trend Note 2: If the parts are stored outside of the specified temperature range, toward reduced drift with time. Long-term stability will also be affected by the output may shift due to hysteresis. differential stresses between the IC and the board material created during board assembly. Note 3: Temperature coefficient is measured by dividing the maximum change in output voltage by the specified temperature range. Note 8: Hysteresis in output voltage is created by package stress that differs depending on whether the IC was previously at a higher or Note 4: Load regulation is measured on a pulse basis from no load to the lower temperature. Output voltage is always measured at 25°C, but specified load current. Output changes due to die temperature change the IC is cycled to the hot or cold temperature limit before successive must be taken into account separately. measurements. Hysteresis measures the maximum output change for the Note 5: Excludes load regulation errors. averages of three hot or cold temperature cycles. For instruments that Note 6: Peak-to-peak noise is measured with a 1-pole highpass filter at are stored at well controlled temperatures (within 20 or 30 degrees of 0.1Hz and 2-pole lowpass filter at 10Hz. The unit is enclosed in a still-air operational temperature), it is usually not a dominant error source. Typical environment to eliminate thermocouple effects on the leads. The test hysteresis is the worst-case of 25°C to cold to 25°C or 25°C to hot to time is 10 seconds. RMS noise is measured on a spectrum analyzer in 25°C, preconditioned by one thermal cycle. a shielded environment where the intrinsic noise of the instrument is Note 9: The stated temperature is typical for soldering of the leads during removed to determine the actual noise of the device. manual rework. For detailed IR reflow recommendations, refer to the Applications Information section. 6654fh 6 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 1.25V Output Impedance Temperature Drift 1.25V Turn-On Characteristics vs Frequency 1.2520 100 THREE TYPICAL PARTS 1.2515 V) Ω) 10 OLTAGE (11..22550150 1V/DVIIVN DANCE ( CL = 1µF REFERENCE V11..22540905 0.5VVG/ODNUIDVT OUTPUT IMPE 0.11 CL = 10µF 1.2490 GND 1.2485 0.01 –60 –40 –20 0 20 40 60 80 100 120 140 20µs/DIV 6654 G02 0.1 1 10 100 1000 TEMPERATURE (°C) CLOAD = 1µF FREQUENCY (kHz) 6654 G01 6654 G03 1.25V Load Regulation (Sourcing) 1.25V Load Regulation (Sinking) 1.25V Output Noise 0.1Hz to 10Hz 30 200 180 pm) 20 –55°C pm) 160 125°C T VOLTAGE CHANGE (p ––2110000 125°C 25°C–40°C T VOLTAGE CHANGE (p 1116042800000 25°C TPUT NOISE (1µV/DIV) PU –30 PU OU UT UT 40 O O –40°C –40 20 –55°C –50 0 0.1 1 10 0.1 1 10 0 1 2 3 4 5 6 7 8 9 10 OUTPUT CURRENT (mA) OUTPUT CURRENT (mA) TIME (1s/DIV) 6654 G04 6654 G05 6654 G06 1.25V Minimum Input Voltage 1.25V Minimum Input Voltage 1.2V Output Voltage Noise (Sourcing) (Sinking) Spectrum 10 10 400 350 25°C RENT (mA) 125°C 25°C –40°C RENT (mA) 125°C –55°C GE (nV√Hz) 235000 R 1 R 1 A 200 OUTPUT CU –55°C OUTPUT CU –40°C NOISE VOLT 110500 IO = 0µA IO = 5mA 50 0.1 0.1 0 1 1.2 1.4 1.6 1.8 2 2.2 2.4 1 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 0.01 0.1 1 10 100 MINIMUM INPUT VOLTAGE (V) MINIMUM INPUT VOLTAGE (V) FREQUENCY (kHz) 6654 G07 6654 G08 6654 G09 6654fh 7 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 Output Voltage 2.5V Supply Current Temperature Drift vs Input Voltage 2.5V Line Regulation 2.502 600 2.5050 THREE TYPICAL PARTS –40°C 2.5040 500 –55°C 2.5030 2.501 V) A) V) 2.5020 AGE ( NT (µ 400 25°C AGE ( 2.5010 T VOLT2.500 CURRE 300 125°C T VOLT 2.5000 25°C OUTPU2.499 INPUT 200 OUTPU 22..44998900 125°C 2.4970 –55°C 100 –40°C 2.4960 2.498 0 2.4950 –60 –20 20 60 100 140 0 5 10 15 20 25 30 35 40 0 5 10 15 20 25 30 35 40 TEMPERATURE (°C) INPUT VOLTAGE (V) INPUT VOLTAGE (V) 6654 G10 6654 G11 6654 G12 2.5V Load Regulation (Sourcing) 2.5V Load Regulation (Sinking) 2.5V Output Noise 0.1Hz to 10Hz 10 180 160 E (ppm) 0 –55°C E (ppm) 140 DIV) OLTAGE CHANG––2100 –401°2C5°C 25°C OLTAGE CHANG 11802000 125°C UT NOISE (1µV/ UT V UT V 60 25°C UTP UTP–30 UTP 40 –40°C O O O 20 –55°C –40 0 0.1 1 10 0.1 1 10 TIME (1s/DIV) 6654 G15 OUTPUT CURRENT (mA) OUTPUT CURRENT (mA) 6654 G13 6654 G14 2.5V Minimum V to V 2.5V Minimum V to V 2.5V Output Voltage Noise IN OUT IN OUT Differential (Sourcing) Differential (Sinking) Spectrum 10 10 400 –55°C 25°C 350 –40°C –55°C RENT (mA) 125°C RENT (mA) 125°C 25°C –40°C GE (nV√Hz) 235000 IO = 0µA R 1 R 1 A 200 UTPUT CU UTPUT CU OISE VOLT 150 IO = 5mA O O N 100 50 0.1 0.1 0 0 50 100 150 200 250 300 350 400 –300 –250 –200 –150 –100 –50 0 50 100 0.01 0.1 1 10 100 INPUT-OUTPUT VOLTAGE (mV) INPUT-OUTPUT VOLTAGE (mV) FREQUENCY (kHz) 6654 G16 6654 G17 6654 G18 6654fh 8 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 2.5V Power Supply Rejection 2.5V Output Impedance 10Hz to 10kHz Ratio vs Frequency vs Frequency 100 –20 100 dB) –30 D NOISE (µV)RMS 10 REJECTION RATIO ( –––546000 CL = 1µF MPEDANCE (Ω) 10 NTEGRATE 1 R SUPPLY ––8700 CL = 10µF OUTPUT I 1 CL = 10µF CL = 1µF I E W O –90 P 0.1 –100 0.1 0.01 0.1 1 10 0.1 1 10 100 1000 1 10 100 1000 FREQUENCY (kHz) FREQUENCY (kHz) FREQUENCY (kHz) 6654 G19 6654 G20 6654 G21 2.5V Load Transient Response 2.5V Turn-On Characteristics 2.5V Line Transient Response (Sourcing) VIN 0.5V/DIV IOUT 3V/DC 0mA VIN 1V/DIV 5mA GND VOUT VOUT VOUT 2mV/DIV/AC 20mV/DIV/AC 1V/DIV 2.5V/DC 2.5V/DC GND 20µs/DIV 6654 G22 50µs/DIV 6654 G23 50µs/DIV 6654 G24 CLOAD = 1µF CLOAD = 1µF CLOAD = 1µF 2.5V Hysteresis Plot for –40°C 2.5V Hysteresis Plot for –40°C and 125°C (TSOT-23) 2.5V Long Term Drift (TSOT-23) and 125°C (LS8) 48 150 6 44 2M5°ACX T AOV 1G2 H5°OCT T COY 2C5L°EC 2M5A°CX TAOV G– 4C0O°LCD T OCY 2C5L°EC 120 TA = 35°C 2A5N°DC 2T5O° C– 4T0O° C1 2T5O° C2 5T°OC 25°C 40 m) 5 p 90 UNITS 233826 HANGE (p 6300 UNITS 4 MBER OF 2204 OLTAGE C –300 MBER OF 3 NU 16 T V –60 NU 2 12 PU 8 OUT –90 1 4 –120 0 –150 0 –150–125–100–75–50–250 2550 75100125150 0 400 800 1200 1600 2000 –40 –30 –20 –10 0 10 20 30 40 DISTRIBUTION (ppm) TIME (HOURS) DISTRIBUTION (ppm) 6654 G25 6654 G26 6654 G37 6654fh 9 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 Load Transient Response 5V Output Voltage Temperature 2.5V Long Term Drift (LS8) (Sinking) Drift 150 5.003 THREE TYPICAL PARTS 120 5.002 90 IOUT 5.001 5mA V) 60 E (5.000 30 0mA LTAG4.999 PPM 0 CE VO4.998 –30 VOUT REN4.997 –60 20mV/DIV/AC FE4.996 2.5V/DC RE –90 4.995 –120 4.994 –150 4.993 0 500 1000 1500 2000 50µs/DIV 6654 G27 –60 –40 –20 0 20 40 60 80 100 120140 TIME (HOURS) CLOAD = 1µF TEMPERATURE (°C) 6654 G38 6654 G28 5V Output Impedance 5V Turn-On Characteristics vs Frequency 5V Load Regulation (Sourcing) 100 50 m) 40 p VIN E (Ω) 10 GE (p 30 2V/DIV NC CL = 1µF AN DA CH 20 –55°C GND T IMPE 1 LTAGE 10 –40°C U O P V 2VV/ODUIVT OUT 0.1 CL = 10µF PUT 0 125°C T U 25°C GND O–10 0.01 –20 50µs/DIV 6654 G29 0.1 1 10 100 1000 0.1 1 10 CLOAD = 1µF FREQUENCY (kHz) OUTPUT CURRENT (mA) 6654 G30 6654 G31 5V Minimum V to V IN OUT 5V Load Regulation (Sinking) 5V Output Noise 0.1Hz to 10Hz Differential (Sourcing) 220 10 200 –55°C 25°C pm)180 –40°C E (p160 DIV) mA) PUT VOLTAGE CHANG1112084600000 12–54°0C°C –55°C 25°C OUTPUT NOISE (4µV/ OUTPUT CURRENT ( 1 125°C T U 40 O 20 0 0.1 0.1 1 10 0 1 2 3 4 5 6 7 8 9 10 0 50 100 150 200 250 300 350 400 OUTPUT CURRENT (mA) TIME (1s/DIV) INPUT-OUTPUT VOLTAGE (mV) 6654 G32 6654 G33 6654 G34 6654fh 10 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 V to V 5V Output Voltage Noise IN OUT Differential (Sinking) Spectrum 10 600 550 500 –55°C RENT (mA) 125°C 25°C –40°C GE (nV√Hz) 443505000 IO = 0µA R 1 A 300 UTPUT CU OISE VOLT 220500 IO = 5mA O N 150 100 50 0.1 0 –300 –250 –200 –150 –100 –50 0 50 100 0.01 0.1 1 10 100 INPUT-OUTPUT VOLTAGE (mV) FREQUENCY (kHz) 6654 G35 6654 G36 pin FuncTions (LS8) (TSOT) DNC (Pins 1, 7): Do Not Connect. Keep leakage current GND (Pin 1): Internal Function. This pin must be tied to from this pin to V or GND to a minimum. ground, near Pin 2. IN NC (Pin 2): Not internally connected. May be tied to V , GND (Pin 2): Primary Device Ground. IN V , GND or floated. OUT DNC (Pin 3): Do Not Connect. Keep leakage current from GND (Pin 3): Internal Function. This pin must be tied to this pin to V or GND to a minimum. IN GND near Pin 4. V (Pin 4): Power Supply. Bypass V with a 0.1µF IN IN GND (Pin 4): Primary Device Ground. Pin 3 and the load capacitor to ground. ground should be star-connected to Pin 4. DNC (Pin 5): Do Not Connect. Keep leakage current from V (Pin 5): V Pin. An output capacitor of 1µF or this pin to V or GND to a minimum. OUT OUT IN greater is required for stable operation. V (Pin 6): Output Voltage. An output capacitor of 1µF OUT V (Pin 6): V Pin. Tie to Pin 5 for proper load regu- minimum is required for stable operation. OUT OUT lation. V (Pin 8): Power Supply. Bypass V with a 0.1µF, or IN IN larger, capacitor to GND. 6654fh 11 For more information www.linear.com/LT6654

LT6654 block DiagraMs VIN 8 DNC 7 + VOUT BANDGAP 5 1 DNC – VOUT 6 GND GND 3 4 NC 2 6654 BDa LS8 VIN 4 DNC 3 + VOUT BANDGAP 6 DNC 5 – GND GND 2 1 6654 BD SOT23 6654fh 12 For more information www.linear.com/LT6654

LT6654 applicaTions inForMaTion Bypass and Load Capacitors The LT6654 voltage references should have an input by- pass capacitor of 0.1µF or larger, however the bypassing VIN on other components nearby is sufficient. In high voltage 1V/DIV applications, V > 30V, an output short-circuit to ground IN GND can create an input voltage transient that could exceed the maximum input voltage rating. To prevent this worst-case VOUT condition, an RC input line filter of 10µs (i.e. 10Ω and 1µF) 1V/DIV is recommended. These references also require an output GND capacitor for stability. The optimum output capacitance for 6654 F01 20µs/DIV most applications is 1µF, although larger values work as CLOAD = 1µF well. This capacitor affects the turn-on and settling time Figure 1. Turn-On Characteristics of LT6654-2.5 for the output to reach its final value. Figure 1 shows the turn-on time for the LT6654-2.5 with a 0.1µF input bypass and 1µF load capacitor. Figure 2 shows VIN the output response to a 0.5V transient on V with the 0.5V/DIV IN 3V/DC same capacitors. The test circuit of Figure 3 is used to measure the stability with various load currents. With R = 1k, the 1V step pro- L duces a current step of 1mA. Figure 4 shows the response VOUT 2mV/DIV/AC to a ±0.5mA load. Figure 5 is the output response to a 2.5V/DC sourcing step from 4mA to 5mA, and Figure 6 is the output response of a sinking step from 4mA to 5mA. 6654 F02 50µs/DIV CLOAD = 1µF Figure 2. Output Response to 0.5V Ripple on V IN 1k VIN IN LT6654-2.5 OUT 3V C0.I1Nµ F GND 1CµLF VGEN 1V 6654 F03 Figure 3. Load Current Response Time Test Circuit 6654fh 13 For more information www.linear.com/LT6654

LT6654 applicaTions inForMaTion Positive or Negative Operation IOUT In addition to the series connection, as shown on the front –0.5mA page of this data sheet, the LT6654 can be operated as a negative voltage reference. 0.5mA The circuit in Figure 7 shows an LT6654 configured for negative operation. In this configuration, a positive volt- VOUT age is required at V (Pin 4) to bias the LT6654 internal 20mV/DIV/AC IN 2.5V/DC circuitry. This voltage must be current limited with R1 to keep the output PNP transistor from turning on and driv- ing the grounded output. C1 provides stability during load 6654 F04 50µs/DIV transients. This connection maintains the same accuracy and CLOAD = 1µF temperature coefficient of the positive connected LT6654. Figure 4. LT6654-2.5 Sourcing and Sinking 0.5mA R1 4.7k IOUT 3V 4mA IN 5mA OUT LT6654-2.5 0.1µF GND VOUT = –2.5V 10mV/DIVVO/AUCT R ≤ 5V5E0Eµ A– +V OIOUUTT C1µ1F 2.5V/DC VEE 6654 F07 Figure 7. Using the LT6654-2.5 to Build a –2.5V Reference 6654 F05 50µs/DIV CLOAD = 1µF Figure 5. LT6654-2.5 Sourcing 4mA to 5mA IOUT –5mA –4mA VOUT 10mV/DIV/AC 2.5V/DC 6654 F06 50µs/DIV CLOAD = 1µF Figure 6. LT6654-2.5 Sinking 4mA to 5mA 6654fh 14 For more information www.linear.com/LT6654

LT6654 applicaTions inForMaTion Long-Term Drift Long-term drift cannot be extrapolated from accelerated similar to a real world application. The boards were then high temperature testing. This erroneous technique placed into a constant temperature oven with T = 35°C, A gives drift numbers that are wildly optimistic. The only their outputs scanned regularly and measured with an 8.5 way long-term drift can be determined is to measure it digit DVM. Long-term drift curves are shown in Figure 8. over the time interval of interest. The LT6654 drift data Their drift is much smaller after the first thousand hours. was taken on 40 parts that were soldered into PC boards 80 80 m) m) p p E (p 40 E (p 40 G G N N A A H H C C GE 0 GE 0 A A LT LT O O V V T T PU–40 PU–40 T T U U O O –80 –80 0 200 400 600 800 1000 1000 1200 1400 1600 1800 2000 TIME (HOURS) TIME (HOURS) LT6654-2.5 S6 PACKAGE 6654 F08a LT6654-2.5 S6 PACKAGE 6654 F08b FIRST THOUSAND HOURS SECOND THOUSAND HOURS (NORMALIZED TO THE FIRST THOUSAND HOURS) 80 40 M P 0 P –40 –80 0 500 1000 1500 2000 TIME (HOURS) LT6654-2.5 LS8 PACKAGE 6654 G38 Figure 8. LT6654-2.5 Long Term Drift 6654fh 15 For more information www.linear.com/LT6654

LT6654 applicaTions inForMaTion Power Dissipation 0.40 335mW The power dissipation in the LT6654 is dependent on V , 0.35 IN load current and the package. The LT6654 package has 0.30 a thermal resistance, or θ , of 192°C/W. A curve that JA W) 0.25 10mA LOAD illustrates allowed power dissipation versus temperature ER ( 0.20 for the 6-lead SOT-23 package is shown in Figure 9. The W O P 0.15 power dissipation of the LT6654-2.5 as a function of input voltage is shown in Figure 10. The top curve shows power 0.10 dissipation with a 10mA load and the bottom curve shows 0.05 NO LOAD power dissipation with no load. When operated within 0 0 5 10 15 20 25 30 35 40 its specified limits of V = 36V and sourcing 10mA, the IN VIN (V) LT6654-2.5 consumes about 335mW at room temperature. 6654 F10 The power-derating curve in Figure 9 shows the LT6654- Figure 10. Typical Power Dissipation of the LT6654 2.5 can only safely dissipate 130mW at 125°C, which is less than its maximum power output. Care must be taken 50 when designing the circuit so that the maximum junction MAX AVG HOT CYCLE MAX AVG COLD CYCLE 25°C TO 125°C TO 25°C 25°C TO –40°C TO 25°C temperature is not exceeded. For best performance, junc- 40 tion temperature should be kept below 125°C. S T The LT6654 includes output current limit circuitry, as well UNI 30 F as thermal limit circuitry, to protect the reference from R O E damage in the event of excessive power dissipation. The MB 20 U N LT6654 is protected from damage by a thermal shutdown 10 circuit. However, changes in performance may occur as a result of operation at high temperature. 0 –150 –100 –50 0 50 100 150 DISTRIBUTION (ppm) 0.7 T = 150°C 6654 F11 0.6 θJA = 192°C/W Figure 11a. LT6654 S6 Thermal Hysteresis –40°C to 125°C 0.5 ER (W) 0.4 6 2A5N°DC 2T5O° C– 4T0O° C1 2T5O° C2 5T°OC 25°C OW 0.3 5 P 130mW 0.2 TS 4 NI U 0.1 R OF 3 E 0 MB 0 20 40 60 80 100 120 140 U 2 N TEMPERATURE (°C) 6654 F09 1 Figure 9. Maximum Allowed Power Dissipation of the LT6654 0 –40 –30 –20 –10 0 10 20 30 40 DISTRIBUTION (ppm) 6654 F11b Figure 11b. LT6654 LS8 Thermal Hysteresis –40°C to 125°C 6654fh 16 For more information www.linear.com/LT6654

LT6654 applicaTions inForMaTion Hysteresis Humidity Sensitivity The hysteresis data is shown in Figure 11. The LT6654 is Plastic mould compounds absorb water. With changes in capable of dissipating relatively high power. For example, relative humidity, plastic packaging materials change the with a 36V input voltage and 10mA load current applied amount of pressure they apply to the die inside, which to the LT6654-2.5, the power dissipation is P = 33.5V can cause slight changes in the output of a voltage refer- D • 10mA = 335mW, which causes an increase in the die ence, usually on the order of 100ppm. The LS8 package is temperature of 64°C. This could increase the junction hermetic, so it is not affected by humidity, and is therefore temperature above 125°C (T is 150°C) and may cause more stable in environments where humidity may be a JMAX the output to shift due to thermal hysteresis. concern. PC Board Layout 300 380s TP = 260°C The mechanical stress of soldering a surface mount volt- RAMP age reference to a PC board can cause the output voltage 225 TL = 217°C DOWN C) TS(MAX) = 200°C to shift and temperature coefficient to change. These two RE (° TS = 190°C 3t0Ps changes are not correlated. For example, the voltage may ATU 150 T = 150°C shift but the temperature coefficient may not. ER tL MP RAMP TO 130s E To reduce the effects of stress-related shifts, mount the T 150°C 40s 75 reference near the short edge of the PC board or in a 120s corner. In addition, slots can be cut into the board on two 0 sides of the device. 0 2 4 6 8 10 MINUTES The capacitors should be mounted close to the LT6654. 6654 F12 The GND and V traces should be as short as possible OUT Figure 12. Lead Free Reflow Profile to minimize I • R drops, since high trace resistance directly impacts load regulation. 14 260°C 3 CYCLES LT6654S6 IR Reflow Shift 260°C 1 CYCLE 12 The different expansion and contraction rates of the ma- S 10 terials that make up the LT6654 package may cause the T NI output voltage to shift after undergoing IR reflow. Lead free F U 8 O solder reflow profiles reach over 250°C, considerably more BER 6 M than with lead based solder. A typical lead free IR reflow U N 4 profile is shown in Figure 12. Similar profiles are found using a convection reflow oven. LT6654 devices run up 2 to three times through this reflow process show that the 0 –140–120–100 –80 –60 –40 –20 0 standard deviation of the output voltage increases with a CHANGE IN OUTPUT (ppm) slight negative mean shift of 0.003% as shown in Figure 13. 6654 F13 While there can be up to 0.014% of output voltage shift, Figure 13. Output Voltage Shift Due to IR Reflow (%) the overall drift of the LT6654 after IR reflow does not vary significantly. 6654fh 17 For more information www.linear.com/LT6654

LT6654 Typical applicaTions Extended Supply Range Reference Boosted Output Current Reference UP TO 160V 4.5V < VIN < 36V 330k 220Ω 4.7µF MMBT5551 2N2905 BZX84C12 IN IN LT6654-2.5 OUT IOUT 0.1µF LT6654-2.5 OUT GND UP TO 300mA 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 OUT GND 1 VIN 0.1µF 10µF LED1* 220Ω 4.7µF 10Ω 2 0.1µF 2N2905 VREF VCC CS DAC A LT6654-2.5 IN OUT IOUT SCK LTC2600 DAC B UP TO 100mA GND SDI DAC C 1µF CLEAR DAC D 6654 TA04 DAC E DAC F *LED CANNOT BE OMMITTED THE LED CLAMPS THE VOLTAGE DAC G DROP ACROSS THE 220Ω AND LIMITS OUTPUT CURRENT GND DAC H 6654 TA05 6654fh 18 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) 2.90 BSC 0.62 0.95 (NOTE 4) MAX REF 1.22 REF 1.50 – 1.75 3.85 MAX 2.62 REF 1.4 MIN 2.80 BSC (NOTE 4) PIN ONE ID RECOMMENDED SOLDER PAD LAYOUT 0.30 – 0.45 0.95 BSC PER IPC CALCULATOR 6 PLCS (NOTE 3) 0.80 – 0.90 0.20 BSC 0.01 – 0.10 1.00 MAX DATUM ‘A’ 0.30 – 0.50 REF 1.90 BSC 0.09 – 0.20 (NOTE 3) S6 TSOT-23 0302 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 6654fh 19 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. 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 2 0.5 6 2.54 ±0.15 1.4 3 1.50 ±0.15 XYY ZZ 4 ABCDEF Q12345e4 0.70 ±0.05 × 8 COMPONENT PIN “A1” 5.00 SQ ±0.15 5.80 SQ ±0.15 TRAY PIN 1 APPLY SOLDER MASK TO AREAS THAT ARE NOT SOLDERED BEVEL PACKAGE IN TRAY LOADING ORIENTATION 5.00 SQ ±0.15 1.45 ±0.10 4.20 SQ ±0.10 5.00 SQ ±0.15 0.95 ±0.10 8 8 R0.20 REF 2.00 REF PIN 1 1 1 TOP MARK 7 7 (SEE NOTE 5) 2 6 6 0.5 2 4.20 ±0.10 2.54 ±0.15 1.4 5 3 3 5 R0.20 REF 1.00 × 7 TYP LS8 0113 REV B 4 4 NOTE: 0.70 TYP 0.10 TYP 0.64 × 8 TYP 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 6654fh 20 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. 1-18 B 3/11 Revised conditions for Output Voltage Noise in the Electrical Characteristics section. 4 C 8/12 Addition of LS8 Features and Order Information. 1, 2, 4 Update to Electrical Characteristics to Include LS8 Package. 6 Addition of Long Term Drift and Hysteresis Plots for LS8 Package. 9, 15, 16 Addition of Humidity Sensitivity Information. 17 Addition of LS8 Package Description. 20 Addition of Related Parts. 22 D 2/14 Schematics updated to refer to pin functions instead of pin numbers. 1, 13, 14, 18 Label of Pin 2 on LS8 package changed to NC. 2, 11, 12 The pin descriptions of Pin 2, Pin 3 and Pin 4 on LS8 package changed. 11 GND label added on all schematic references of LT6654. 18, 22 E 6/15 SOT-23 removed from data sheet title. 1 Order Information updated to include 2.048V, 4.096V and 5V option in LS8 package. 3, 4 F 12/15 Part marking correction for 4.096V options in TSOT-23 package. 3 Web link to Package Description updated. 19, 20 G 03/17 Added 2.5V option in I-temp grade. 2-5 H 05/17 Added 1.25V, 2.048V, 3V, 3.3V, 4.096V and 5V Option in I-temp grade. 2-5 6654fh Information furnished by Linear Technology Corporation is believed to be accurate and reliable. 21 However, no responsibility is assumed for its use. Linear Technology Corporation makes no representa- tion that the interconnecFtioorn mof oitrse c iirncfuoitrsm asa dtieosncr wibewdw h.elrineiena wr.icll onmot /inLTfr6in6g5e 4on existing patent rights.

LT6654 Typical applicaTion 16-Bit ADC Reference 4.6V < VS < 36V LT6654-4.096 IN OUT GND 0.1µF 10µF + VREF VCC SDO IN+ SDI –2.048V < VDIFFERENTIAL < 2.048V LTC2480 TO MCU CS – IN– GND fO 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, 0°C to 70°C, –40°C to 85°C, –40°C to 125°C Options in SO-8 LT1790 Micropower Precision Series References 0.05% Max, 10ppm/°C Max, 60µA Supply, SOT-23 Package LT6650 Micropower Reference with Buffer Amplifier 0.05% Max, 5.6µA Supply, SOT-23 Package LTC6652 Precision Low Drift Low Noise Buffered 0.5% Max, 5ppm/°C Max, 2.1ppm Noise (0.1Hz to 10Hz) 100% Tested at –40°C, P-P Reference 25°C and 125°C LT6660 Tiny Micropower Series Reference 0.2% Max, 20ppm/°C Max, 20mA Output Current, 2mm × 2mm DFN LTC6655 Precision Low Noise Reference 2ppm/°C Max, 650nV Noise (0.1Hz to 10Hz) 100% Tested at –40°C, 25°C and 125°C P-P LT6656 800nA Precision Voltage Reference 800nA, 10ppm/°C Max, 0.05% Max, SOT-23 Package 6654fh 22 LT 0517 REV H • PRINTED IN USA www.linear.com/LT6654 For more information www.linear.com/LT6654  LINEAR TECHNOLOGY CORPORATION 2010

Mouser Electronics Authorized Distributor Click to View Pricing, Inventory, Delivery & Lifecycle Information: A nalog Devices Inc.: LT6654AHLS8-2.5#PBF LT6654BHS6-5#PBF LT6654AHS6-3.3#PBF LT6654BMPS6-4.096#TRMPBF LT6654AHS6-3#PBF LT6654AMPS6-1.25#PBF LT6654BHS6-3.3#TRMPBF LT6654BHS6-2.5#TRPBF LT6654AHS6- 1.25#TRPBF LT6654AMPS6-3#TRM LT6654BMPS6-3.3#TRM LT6654BMPS6-1.25#TRMPBF LT6654AMPS6- 2.5#PBF LT6654BHS6-2.048#PBF LT6654AMPS6-4.096#TRPBF LT6654BMPS6-3#TRMPBF LT6654AMPS6- 2.048#TRMPBF LT6654AHS6-2.048#TRPBF LT6654AMPS6-2.5#TRPBF LT6654BMPS6-2.5#PBF LT6654BHS6- 3#TRMPBF LT6654BMPS6-3.3#PBF LT6654AMPS6-2.048#PBF LT6654AHS6-4.096#PBF LT6654BMPS6-5#TRPBF LT6654BHLS8-2.048#PBF LT6654AMPS6-3 LT6654AHS6-2.048#PBF LT6654BMPS6-2.5#TRMPBF LT6654BHS6- 1.25#PBF LT6654AMPS6-2.048#TRPBF LT6654BMPS6-2.048#TRPBF LT6654AHS6-3.3#TRMPBF LT6654BHS6- 3.3#TRPBF LT6654AHLS8-4.096#PBF LT6654BHS6-4.096#TRPBF LT6654AHS6-4.096#TRMPBF LT6654BMPS6- 3#PBF LT6654AHS6-2.5#PBF LT6654BMPS6-3#TRPBF LT6654AMPS6-3.3#PBF LT6654AMPS6-3#TRMPBF LT6654AMPS6-3.3#TRMPBF LT6654BHS6-4.096#PBF LT6654AHS6-5#TRPBF LT6654AMPS6-2.5#TRM LT6654BHS6-2.048#TRMPBF LT6654AMPS6-2.5#TR LT6654BMPS6-3.3#TR LT6654AHS6-2.048#TRMPBF LT6654BMPS6-2.5#TRPBF LT6654BHS6-2.5#PBF LT6654AHS6-4.096#TRPBF LT6654BMPS6-3.3#TRMPBF LT6654BHS6-1.25#TRMPBF LT6654BHS6-3.3#PBF LT6654AHS6-3#TRMPBF LT6654AMPS6-4.096#PBF LT6654BMPS6-4.096#TRPBF LT6654AMPS6-3#TRPBF LT6654BHS6-2.048#TRPBF LT6654AHS6-1.25#PBF LT6654BHS6-5#TRMPBF LT6654AHS6-2.5#TRMPBF LT6654AHLS8-5#PBF LT6654BHLS8-5#PBF LT6654AHS6- 5#TRMPBF LT6654BHS6-5#TRPBF LT6654AMPS6-3#TR LT6654AHS6-5#PBF LT6654BHS6-1.25#TRPBF LT6654BHS6-3#PBF LT6654BMPS6-5#PBF LT6654AHLS8-2.048#PBF LT6654AMPS6-5#PBF LT6654BHS6- 3#TRPBF LT6654BMPS6-4.096#PBF LT6654AMPS6-1.25#TRMPBF LT6654AHS6-3.3#TRPBF LT6654BMPS6- 3.3#TRPBF LT6654BHS6-4.096#TRMPBF LT6654AHS6-2.5#TRPBF LT6654BMPS6-2.048#PBF LT6654AMPS6- 1.25#TRPBF LT6654AMPS6-2.5#TRMPBF LT6654AHS6-3#TRPBF LT6654AMPS6-3.3#TRM LT6654AMPS6- 5#TRPBF LT6654AMPS6-2.5 LT6654AMPS6-4.096#TRMPBF LT6654BHLS8-2.5#PBF LT6654BMPS6-1.25#TRPBF LT6654BMPS6-1.25#PBF LT6654AMPS6-3#PBF LT6654BMPS6-5#TRMPBF LT6654BHLS8-4.096#PBF LT6654AMPS6-5#TRMPBF LT6654AMPS6-3.3#TRPBF LT6654BHS6-2.5#TRMPBF LT6654AHS6-1.25#TRMPBF