LT6656 1A Precision Series Voltage Reference DESCRIPTION FEATURES n n n n n n n n n n n n Low Drift A Grade: 10 ppm/C Max B Grade: 20 ppm/C Max High Accuracy A Grade: 0.05% Max B Grade: 0.1% Max Ultralow Supply Current: 850nA High Output Drive Current: 5mA Min Low Dropout Voltage: 10mV Max Fully Specified from -40C to 85C Operational from -55C to 125C Wide Supply Range to 18V Reverse Input/Output Protection Available Output Voltage Options: 1.25V, 2.048V, 2.5V, 3V, 3.3V, 4.096V and 5V Thermal Hysteresis: 25ppm Available in Low Profile (1mm) ThinSOTTM and (2mm x 2mm) DFN Packages APPLICATIONS n n n n n n Precision A/D and D/A Converters Portable Gas Monitors Battery- or Solar-Powered Systems Precision Regulators Low Voltage Signal Processing Micropower Remote Sensing The LT(R)6656 is a tiny precision voltage reference that draws less than 1A of supply current and can operate with a supply voltage within 10mV of the output voltage. The LT6656 offers an initial accuracy of 0.05% and temperature drift of 10ppm/C. The combined low power and precision characteristics are ideal for portable and battery powered instrumentation. The LT6656 can supply up to 5mA of output drive with 65ppm/mA of load regulation, allowing it to be used as the supply voltage and the reference input to a low power ADC. The LT6656 can accept a supply voltage up to 18V and withstand the reversal of the input connections. The LT6656 output is stable with 1F or larger output capacitance and operates with a wide range of output capacitor ESR. This reference is fully specified for operation from -40C to 85C, and is functional over the extreme temperature range of -55C to 125C. Low hysteresis and a consistent temperature drift are obtained through advanced design, processing and packaging techniques. The LT6656 is offered in the 6-lead SOT-23 and (2mm x 2mm) DFN Packages. L, LT, LTC and LTM 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 LT6656-2.5 2.503 Basic Connection 0.1F 2.502 VOUT 2.5V 1F 6656 TA01a VOUT (V) 2.51V VIN 18V LT6656-2.5 VIN VOUT GND 38 TYPICAL UNITS 2.501 2.500 2.499 2.498 -40 -20 0 20 40 TEMPERATURE (C) 60 80 6652 TA01b 6656fa 1 LT6656 ABSOLUTE MAXIMUM RATINGS (Note 1) Input Voltage............................................................20V Output Voltage............................................ -0.3V to 20V Output Voltage Above Input Voltage..........................20V Specified Temperature Range (Note 2) Commercial.............................................. 0C to 70C Industrial..............................................-40C to 85C Operating Temperature Range (Note 2).. -55C to 125C Output Short Circuit Duration .......................... Indefinite Junction Temperature ........................................... 150C Storage Temperature Range (Note 3)...... -65C to 150C Lead Temperature (Soldering, 10 sec.) TSOT-23 (Note 4)............................................... 300C PIN CONFIGURATION TOP VIEW TOP VIEW GND* 1 6 VIN NC 1 6 VOUT GND 2 5 NC GND 2 NC 3 4 VIN GND* 3 S6 PACKAGE 6-LEAD PLASTIC TSOT-23 TJMAX = 150C, JA = 230C/W *CONNECT PIN TO DEVICE GND (PIN 2) 7 GND* 5 NC 4 VOUT DC PACKAGE 6-LEAD (2mm x 2mm) PLASTIC DFN TJMAX = 125C, JA = 102C/W EXPOSED PAD (PIN 7) MUST BE CONNECTED TO GND ORDER INFORMATION LEAD FREE FINISH TAPE AND REEL (MINI) TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION SPECIFIED TEMPERATURE RANGE LT6656ACS6-1.25#TRMPBF LT6656ACS6-1.25#TRPBF LTFNK 6-Lead Plastic TSOT-23 0C to 70C LT6656BCS6-1.25#TRMPBF LT6656BCS6-1.25#TRPBF LTFNK 6-Lead Plastic TSOT-23 0C to 70C LT6656AIS6-1.25#TRMPBF LT6656AIS6-1.25#TRPBF LTFNK 6-Lead Plastic TSOT-23 -40C to 85C LT6656BIS6-1.25#TRMPBF LT6656BIS6-1.25#TRPBF LTFNK 6-Lead Plastic TSOT-23 -40C to 85C LT6656ACS6-2.048#TRMPBF LT6656ACS6-2.048#TRPBF LTFNN 6-Lead Plastic TSOT-23 0C to 70C LT6656BCS6-2.048#TRMPBF LT6656BCS6-2.048#TRPBF LTFNN 6-Lead Plastic TSOT-23 0C to 70C LT6656AIS6-2.048#TRMPBF LT6656AIS6-2.048#TRPBF LTFNN 6-Lead Plastic TSOT-23 -40C to 85C LT6656BIS6-2.048#TRMPBF LT6656BIS6-2.048#TRPBF LTFNN 6-Lead Plastic TSOT-23 -40C to 85C LT6656ACS6-2.5#TRMPBF LT6656ACS6-2.5#TRPBF LTFGW 6-Lead Plastic TSOT-23 0C to 70C LT6656BCS6-2.5#TRMPBF LT6656BCS6-2.5#TRPBF LTFGW 6-Lead Plastic TSOT-23 0C to 70C LT6656AIS6-2.5#TRMPBF LT6656AIS6-2.5#TRPBF LTFGW 6-Lead Plastic TSOT-23 -40C to 85C LT6656BIS6-2.5#TRMPBF LT6656BIS6-2.5#TRPBF LTFGW 6-Lead Plastic TSOT-23 -40C to 85C LT6656ACS6-3#TRMPBF LT6656ACS6-3#TRPBF LTFNQ 6-Lead Plastic TSOT-23 0C to 70C LT6656BCS6-3#TRMPBF LT6656BCS6-3#TRPBF LTFNQ 6-Lead Plastic TSOT-23 0C to 70C LT6656AIS6-3#TRMPBF LT6656AIS6-3#TRPBF LTFNQ 6-Lead Plastic TSOT-23 -40C to 85C LT6656BIS6-3#TRMPBF LT6656BIS6-3#TRPBF LTFNQ 6-Lead Plastic TSOT-23 -40C to 85C LT6656ACS6-3.3#TRMPBF LT6656ACS6-3.3#TRPBF LTFNS 6-Lead Plastic TSOT-23 0C to 70C LT6656BCS6-3.3#TRMPBF LT6656BCS6-3.3#TRPBF LTFNS 6-Lead Plastic TSOT-23 0C to 70C LT6656AIS6-3.3#TRMPBF LT6656AIS6-3.3#TRPBF LTFNS 6-Lead Plastic TSOT-23 -40C to 85C LT6656BIS6-3.3#TRMPBF LT6656BIS6-3.3#TRPBF LTFNS 6-Lead Plastic TSOT-23 -40C to 85C 6656fa 2 LT6656 ORDER INFORMATION LEAD FREE FINISH PART MARKING* PACKAGE DESCRIPTION SPECIFIED TEMPERATURE RANGE LT6656ACS6-4.096#TRMPBF LT6656ACS6-4.096#TRPBF TAPE AND REEL (MINI) TAPE AND REEL LTFNV 6-Lead Plastic TSOT-23 0C to 70C LT6656BCS6-4.096#TRMPBF LT6656BCS6-4.096#TRPBF LTFNV 6-Lead Plastic TSOT-23 0C to 70C LT6656AIS6-4.096#TRMPBF LT6656AIS6-4.096#TRPBF LTFNV 6-Lead Plastic TSOT-23 -40C to 85C LT6656BIS6-4.096#TRMPBF LT6656BIS6-4.096#TRPBF LTFNV 6-Lead Plastic TSOT-23 -40C to 85C LT6656ACS6-5#TRMPBF LT6656ACS6-5#TRPBF LTFNX 6-Lead Plastic TSOT-23 0C to 70C LT6656BCS6-5#TRMPBF LT6656BCS6-5#TRPBF LTFNX 6-Lead Plastic TSOT-23 0C to 70C LT6656AIS6-5#TRMPBF LT6656AIS6-5#TRPBF LTFNX 6-Lead Plastic TSOT-23 -40C to 85C LT6656BIS6-5#TRMPBF LT6656BIS6-5#TRPBF LTFNX 6-Lead Plastic TSOT-23 -40C to 85C LT6656ACDC-1.25#TRMPBF LT6656ACDC-1.25#TRPBF LFNM 6-Lead (2mm x 2mm) Plastic DFN 0C to 70C LT6656BCDC-1.25#TRMPBF LT6656BCDC-1.25#TRPBF LFNM 6-Lead (2mm x 2mm) Plastic DFN 0C to 70C LT6656AIDC-1.25#TRMPBF LT6656AIDC-1.25#TRPBF LFNM 6-Lead (2mm x 2mm) Plastic DFN -40C to 85C LT6656BIDC-1.25#TRMPBF LT6656BIDC-1.25#TRPBF LFNM 6-Lead (2mm x 2mm) Plastic DFN -40C to 85C LT6656ACDC-2.048#TRMPBF LT6656ACDC-2.048#TRPBF LFNP 6-Lead (2mm x 2mm) Plastic DFN 0C to 70C LT6656BCDC-2.048#TRMPBF LT6656BCDC-2.048#TRPBF LFNP 6-Lead (2mm x 2mm) Plastic DFN 0C to 70C LT6656AIDC-2.048#TRMPBF LT6656AIDC-2.048#TRPBF LFNP 6-Lead (2mm x 2mm) Plastic DFN -40C to 85C LT6656BIDC-2.048#TRMPBF LT6656BIDC-2.048#TRPBF LFNP 6-Lead (2mm x 2mm) Plastic DFN -40C to 85C LT6656ACDC-2.5#TRMPBF LT6656ACDC-2.5#TRPBF LFGX 6-Lead (2mm x 2mm) Plastic DFN 0C to 70C LT6656BCDC-2.5#TRMPBF LT6656BCDC-2.5#TRPBF LFGX 6-Lead (2mm x 2mm) Plastic DFN 0C to 70C LT6656AIDC-2.5#TRMPBF LT6656AIDC-2.5#TRPBF LFGX 6-Lead (2mm x 2mm) Plastic DFN -40C to 85C LT6656BIDC-2.5#TRMPBF LT6656BIDC-2.5#TRPBF LFGX 6-Lead (2mm x 2mm) Plastic DFN -40C to 85C LT6656ACDC-3#TRMPBF LT6656ACDC-3#TRPBF LFNR 6-Lead (2mm x 2mm) Plastic DFN 0C to 70C LT6656BCDC-3#TRMPBF LT6656BCDC-3#TRPBF LFNR 6-Lead (2mm x 2mm) Plastic DFN 0C to 70C LT6656AIDC-3#TRMPBF LT6656AIDC-3#TRPBF LFNR 6-Lead (2mm x 2mm) Plastic DFN -40C to 85C LT6656BIDC-3#TRMPBF LT6656BIDC-3#TRPBF LFNR 6-Lead (2mm x 2mm) Plastic DFN -40C to 85C LT6656ACDC-3.3#TRMPBF LT6656ACDC-3.3#TRPBF LFNT 6-Lead (2mm x 2mm) Plastic DFN 0C to 70C LT6656BCDC-3.3#TRMPBF LT6656BCDC-3.3#TRPBF LFNT 6-Lead (2mm x 2mm) Plastic DFN 0C to 70C LT6656AIDC-3.3#TRMPBF LT6656AIDC-3.3#TRPBF LFNT 6-Lead (2mm x 2mm) Plastic DFN -40C to 85C LT6656BIDC-3.3#TRMPBF LT6656BIDC-3.3#TRPBF LFNT 6-Lead (2mm x 2mm) Plastic DFN -40C to 85C LT6656ACDC-4.096#TRMPBF LT6656ACDC-4.096#TRPBF LFNW 6-Lead (2mm x 2mm) Plastic DFN 0C to 70C LT6656BCDC-4.096#TRMPBF LT6656BCDC-4.096#TRPBF LFNW 6-Lead (2mm x 2mm) Plastic DFN 0C to 70C LT6656AIDC-4.096#TRMPBF LT6656AIDC-4.096#TRPBF LFNW 6-Lead (2mm x 2mm) Plastic DFN -40C to 85C LT6656BIDC-4.096#TRMPBF LT6656BIDC-4.096#TRPBF LFNW 6-Lead (2mm x 2mm) Plastic DFN -40C to 85C LT6656ACDC-5#TRMPBF LT6656ACDC-5#TRPBF LFNY 6-Lead (2mm x 2mm) Plastic DFN 0C to 70C LT6656BCDC-5#TRMPBF LT6656BCDC-5#TRPBF LFNY 6-Lead (2mm x 2mm) Plastic DFN 0C to 70C LT6656AIDC-5#TRMPBF LT6656AIDC-5#TRPBF LFNY 6-Lead (2mm x 2mm) Plastic DFN -40C to 85C LT6656BIDC-5#TRMPBF LT6656BIDC-5#TRPBF LFNY 6-Lead (2mm x 2mm) Plastic DFN -40C to 85C Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.Consult LTC Marketing for information on non-standard lead based finish parts. For more information on lead free part marking, go to: http://www.linear.com/leadfree/ For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/ 6656fa 3 LT6656 AVAILABLE OPTIONS SPECIFIED TEMPERATURE RANGE 0C TO 70C -40C TO 85C ORDER PART NUMBER* ORDER PART NUMBER* OUTPUT VOLTAGE INITIAL ACCURACY TEMPERATURE COEFFICIENT 1.250V 0.05% 10ppm/C LT6656ACS6-1.25 LT6656AIS6-1.25 0.10% 20ppm/C LT6656BCS6-1.25 LT6656BIS6-1.25 0.10% 10ppm/C LT6656ACDC-1.25 LT6656AIDC-1.25 0.20% 20ppm/C LT6656BCDC-1.25 LT6656BIDC-1.25 0.05% 10ppm/C LT6656ACS6-2.048 LT6656AIS6-2.048 2.048V 2.500V 3.000V 3.300V 4.096V 5.000V 0.10% 20ppm/C LT6656BCS6-2.048 LT6656BIS6-2.048 0.10% 10ppm/C LT6656ACDC-2.048 LT6656AIDC-2.048 0.20% 20ppm/C LT6656BCDC-2.048 LT6656BIDC-2.048 0.05% 10ppm/C LT6656ACS6-2.5 LT6656AIS6-2.5 0.10% 20ppm/C LT6656BCS6-2.5 LT6656BIS6-2.5 0.10% 10ppm/C LT6656ACDC-2.5 LT6656AIDC-2.5 0.20% 20ppm/C LT6656BCDC-2.5 LT6656BIDC-2.5 0.05% 10ppm/C LT6656ACS6-3 LT6656AIS6-3 0.10% 20ppm/C LT6656BCS6-3 LT6656BIS6-3 0.10% 10ppm/C LT6656ACDC-3 LT6656AIDC-3 0.20% 20ppm/C LT6656BCDC-3 LT6656BIDC-3 0.05% 10ppm/C LT6656ACS6-3.3 LT6656AIS6-3.3 0.10% 20ppm/C LT6656BCS6-3.3 LT6656BIS6-3.3 0.10% 10ppm/C LT6656ACDC-3.3 LT6656AIDC-3.3 0.20% 20ppm/C LT6656BCDC-3.3 LT6656BIDC-3.3 0.05% 10ppm/C LT6656ACS6-4.096 LT6656AIS6-4.096 0.10% 20ppm/C LT6656BCS6-4.096 LT6656BIS6-4.096 0.10% 10ppm/C LT6656ACDC-4.096 LT6656AIDC-4.096 0.20% 20ppm/C LT6656BCDC-4.096 LT6656BIDC-4.096 0.05% 10ppm/C LT6656ACS6-5 LT6656AIS6-5 0.10% 20ppm/C LT6656BCS6-5 LT6656BIS6-5 0.10% 10ppm/C LT6656ACDC-5 LT6656AIDC-5 0.20% 20ppm/C LT6656BCDC-5 LT6656BIDC-5 *See Order Information section for complete part number listing. 6656fa 4 LT6656 ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the specified temperature range, otherwise specifications are at TA = 25C. VIN = VOUT + 0.5V (for LT6656-1.25, VIN = 2.2V), CL = 1F, IL = 0,unless otherwise noted. PARAMETER CONDITIONS MIN Output Voltage Error LT6656ACS6, LT6656AIS6 LT6656BCS6, LT6656BIS6 LT6656ACDC, LT6656AIDC LT6656BCDC, LT6656BIDC -0.05 -0.1 -0.1 -0.2 Output Voltage Temperature Coefficient (Note 5) LT6656A LT6656B l l Line Regulation VIN = (VOUT + 0.5V) to 18V LT6656-2.048, LT6656-2.5, LT6656-3, LT6656-3.3, LT6656-4.096, LT6656-5 l VIN = 2.2V to 18V LT6656-1.25 Load Regulation (Note 6) IL = 5mA, Sourcing LT6656-2.048, LT6656-2.5, LT6656-3, LT6656-3.3, LT6656-4.096, LT6656-5 IL = 5mA, Sourcing LT6656-1.25 Dropout Voltage (Note 7) VIN - VOUT, VOUT Error 0.1% IL = 0 LT6656-2.048, LT6656-2.5, LT6656-3, LT6656-3.3, LT6656-4.096, LT6656-5 IL = 5mA, Sourcing LT6656-2.048, LT6656-2.5, LT6656-3, LT6656-3.3, LT6656-4.096, LT6656-5 Minimum Input Voltage IL = 0, VOUT Error 0.1% LT6656-1.25 0C TA 70C -40C TA 85C TYP UNITS 0.05 0.1 0.1 0.2 % % % % 5 12 10 20 ppm/C ppm/C 2 25 40 ppm/V ppm/V 2 25 40 ppm/V ppm/V 65 150 375 ppm/mA ppm/mA 80 175 425 ppm/mA ppm/mA 3 10 40 mV mV 250 370 500 mV mV 1.35 1.5 1.6 1.8 V V V 0.85 1.0 1.5 A A l l l l l l l Supply Current MAX l Output Short Circuit Current Short VOUT to GND Short VOUT to VIN 18 4 mA mA Input Reverse Leakage Current VIN = -18V, VOUT = GND 80 A Reverse Output Current VIN = GND, VOUT = 18V 30 A Output Voltage Noise (Note 8) 0.1Hz to 10Hz 10Hz to 1kHz, LT6656-1.25 10Hz to 1kHz, LT6656-2.5 10Hz to 1kHz, LT6656-5 30 50 80 140 ppmP-P VRMS VRMS VRMS Turn-On Time LT6656-1.25, 0.1% Settling LT6656-2.5, 0.1% Settling LT6656-5, 0.1% Settling 15 30 60 ms ms ms 50 ppm/kHr 25 70 ppm ppm Long Term Drift of Output Voltage (Note 9) Hysteresis (Note 10) T = 0C to 70C T = -40C to 85C 6656fa 5 LT6656 ELECTRICAL CHARACTERISTICS 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: The LT6656C is guaranteed to meet specified performance from 0C to 70C. The LT6656C is designed, characterized and expected to meet specified performance from -40C to 85C but is not tested or QA sampled at these temperatures. The LT6656I is guaranteed to meet specified performance from -40C to 85C. By design, the LT6656 is guaranteed functional over the operating temperature range of -55C to 125C. Note 3: If the LT6656 is stored outside of the specified temperature range, the output may shift due to hysteresis. Note 4: The stated temperature is typical for soldering of the leads during manual rework. For detailed IR reflow recommendations, refer to the Applications section. Note 5: Temperature coefficient is measured by dividing the maximum change in output voltage by the specified temperature range. Note 6: Load regulation is measured with a pulse from no load to the specified load current. Output changes due to die temperature change must be taken into account separately. Note 7: Excludes load regulation errors. Note 8: Peak-to-peak noise is measured with a 3-pole highpass filter at 0.1Hz and a 4-pole lowpass filter at 10Hz. The unit is enclosed in a still-air environment to eliminate thermocouple effects on the leads. The test time is 10 seconds. RMS noise is measured on a spectrum analyzer in a shielded environment. Note 9: 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 10: Hysteresis in output voltage is created by mechanical stress that differs depending on whether the IC was previously at a higher or lower temperature. Output voltage is always measured at 25C, but the IC is cycled to the hot or cold temperature limit before successive measurements. For instruments that are stored at well controlled temperatures (within 20 or 30 degrees of operational temperature) hysteresis is usually not a dominant error source. TYPICAL PERFORMANCE CHARACTERISTICS Output Voltage Temperature Drift 200 6000 5000 4000 3000 2000 120 100 80 60 40 0 20 6652 G01 Supply Current vs Input Voltage 100 ALL OPTIONS 180 CL = 1F I =0 160 TL = 25C A 140 1000 -1000 -60 -40 -20 0 20 40 60 80 100 120 TEMPERATURE (C) Typical VOUT Distribution SUPPLY CURRENT (A) ALL OPTIONS 9000 25 TYPICAL UNITS 8000 NORMALIZED AT 25C CL = 1F 7000 IL = 0 NUMBER OF UNITS CHANGE IN OUTPUT VOLTAGE (ppm) 10000 0 -0.10 -0.06 -0.02 0 0.02 0.06 OUTPUT VOLTAGE ERROR (%) 0.10 6656 G02 1.25V OPTION 10 TA = 125C TA = 85C TA = 25C TA = -40C TA = -55C 1 0.1 0 2 4 6 8 10 12 14 16 18 20 INPUT VOLTAGE (V) 6656 G17 6656fa 6 LT6656 TYPICAL PERFORMANCE CHARACTERISTICS Minimum Supply Voltage vs Load Current Supply Current vs Input Voltage VON 1 2.5V OPTION SHOWN VON MOVES WITH VOLTAGE OPTION 0.1 0 2 4 1.25V OPTION INITIAL VIN = 2.2V 1.8 VOUT = 0.1% 1.6 1.4 1.2 TA = 125C TA = 85C TA = 25C TA = -40C TA = -55C 1.0 0.8 0.1 6 8 10 12 14 16 18 20 INPUT VOLTAGE (V) 1 10 100 1m LOAD CURRENT (A) 6656 G03 Load Regulation (Sourcing) TA = 125C TA = 85C TA = 25C TA = -40C TA = -55C 1 10 100 1m LOAD CURRENT (A) 10m 0 -250 -500 -750 0.1 600 2.5V OPTION SHOWN VON MOVES WITH 500 VOLTAGE OPTION 400 VON 300 200 100 0 -100 -200 0 2 4 TA = 125C TA = 85C TA = 25C TA = -55C 1 6 8 10 12 14 16 18 20 INPUT VOLTAGE (V) 6656 G08 90 3.5 3.0 TA = 85C, 125C TA = 25C TA = -40C TA = -55C 2.5 2.0 1.5 1.0 0.5 0 10 100 1m LOAD CURRENT (A) 10m -0.5 10 100 LOAD CURRENT (A) 70 60 50 40 30 20 1.25V OPTION 2.5V OPTION 5V OPTION 10 0 10 100 1k FREQUENCY (Hz) 1m 6656 G06 Power Supply Rejection Ratio vs Frequency VIN = VOUT + 0.5V CL = 1F IL = 0 80 10m ALL OPTIONS 4.5 VIN = VOUT + 0.5V 4.0 CL = 1F 6656 G05 POWER SUPPLY REJECTION RATIO (dB) OUTPUT VOLTAGE CHANGE (ppm) 700 10 100 1m LOAD CURRENT (A) 6656 G04 Power Supply Rejection Ratio vs Frequency TA = 125C TA = 85C TA = 25C TA = -55C 1 Load Regulation (Sinking) 250 Line Regulation ALL OPTIONS 900 I = 0 L 800 CL = 1F TA = 125C TA = 85C TA = 25C TA = -55C 5.0 2.048V TO 5V OPTIONS VIN = VOUT + 0.5V 500 CL = 1F 6656 G19 1000 1 0.1 10m OUTPUT VOLTAGE CHANGE (%) OUTPUT VOLTAGE CHANGE (ppm) OUTPUT VOLTAGE CHANGE (ppm) -250 -1000 0.1 10 Load Regulation (Sourcing) 0 -750 100 750 1.25V OPTION VIN = 1.75V 250 CL = 1F 2.048V TO 5V OPTIONS VIN - VOUT INITIAL VIN = VOUT + 0.5V VOUT = 0.1% 6656 G18 500 -500 DROPOUT VOLTAGE (mV) 10 TA = 125C TA = 85C TA = 25C TA = -55C 1000 10k 6656 G09 90 POWER SUPPLY REJECTION RATIO (dB) 2.048V TO 5V OPTIONS Dropout Voltage vs Load Current 2.0 MINIMUM SUPPLY VOLTAGE (V) SUPPLY CURRENT (A) 100 2.5V OPTION VIN = 3V 80 70 60 50 40 30 20 IL = 0, CL = 1F IL = 0, CL = 10F IL = 1mA, CL = 1F IL = 1mA, CL = 10F 10 0 -10 10 100 1k FREQUENCY (Hz) 10k 6656 G20 6656fa 7 LT6656 TYPICAL PERFORMANCE CHARACTERISTICS Output Impedance vs Frequency 100 10 1.25V OPTION 2.5V OPTION 5V OPTION 100 1k FREQUENCY (Hz) 1k 100 10 1 10k IL = 0, CL = 1F IL = 0, CL = 10F IL = 100A, CL = 1F IL = 100A, CL = 10F 10 100 1k FREQUENCY (Hz) 6656 G21 TA = 125C TA = 85C TA = 25C TA = -55C 0 ALL OPTIONS VIN = GND TA = 125C TA = 85C TA = 25C TA = -55C 0 5 10 15 OUTPUT VOLTAGE (V) 15 10 2.5V OPTION 5 100 1k FREQUENCY (Hz) TIME (1s/DIV) 6656 G13 Output Noise Voltage Spectrum vs Load Capacitance IL = 0 IL = 10A IL = 250A IL = 1mA 12 10 8 6 4 10k 6656 G24 0 40 2.5V OPTION 35 VIN = 3V CL = 47F IL = 0 30 25 20 CL = 4.7F 15 CL = 0.47F 10 5 2 1.25V OPTION 10 2.5V OPTION 14 VIN = 3V CL = 1F NOISE VOLTAGE (V/Hz) NOISE VOLTAGE (VRMS/Hz) 5V OPTION 0 16 VIN = VOUT + 5V CL = 1F IL = 0 20 ALL OPTIONS VIN = VOUT + 0.5V CL = 1F IL = 0 20 Output Voltage Noise Spectrum vs Load Current Output Voltage Noise Spectrum 25 10m 6656 G12 6656 G11 30 100 1m LOAD CURRENT (A) Output Noise 0.1Hz to 10Hz 10 1 -2 -4 -6 -8 -10 -12 -14 -16 -18 -20 INPUT VOLTAGE (V) TA = 125C TA = 85C TA = 25C TA = -55C 6656 G07 OUTPUT NOISE (20ppm/DIV) 10 REVERSE OUTPUT CURRENT (A) REVERSE INPUT CURRENT (A) ALL OPTIONS VOUT = GND 100 0 10 Reverse Output Current 100 1 100 6656 G22 Reverse Input Current 1000 ALL OPTIONS VIN = VOUT + 0.5V CL = 1F 1 10 10k NOISE VOLTAGE (V/Hz) 10 2.5V OPTION VIN = 3V 1000 GROUND CURRENT (A) VIN = VOUT + 0.5V CL = 1F IL = 0 1k 1 Ground Current vs Load Current Output Impedance vs Frequency 10k OUTPUT IMPEDANCE () OUTPUT IMPEDANCE () 10k 10 100 1k FREQUENCY (Hz) 10k 6656 G14 0 1 10 100 FREQUENCY (Hz) 1k 6656 G15 6656fa 8 LT6656 TYPICAL PERFORMANCE CHARACTERISTICS 250 VIN = VOUT + 0.5V CL = 1F 400 INTEGRATED NOISE (VRMS) INTEGRATED NOISE (VRMS) 500 Integrated 10Hz to 1kHz Noise vs Load Current 300 5V OPTION 200 2.5V OPTION 100 ALL OPTIONS 150 CL = 1F IL = 0 2.5V OPTION 200 150 100 CL = 0.47F CL = 1F CL = 10F CL = 47F 50 1.25V OPTION 0 0.1 1 10 100 LOAD CURRENT (A) 1m 10m Long-Term Drift 200 0 0.1 1 10 100 LOAD CURRENT (A) 6656 G25 1m 10m LONG TERM DRIFT (ppm) Integrated 10Hz to 1kHz Noise vs Load Current 100 50 0 -50 -100 -150 5 TYPICAL PARTS SOLDERED ONTO PCB -200 0 100 200 300 400 500 600 700 800 900 1000 HOURS 6656 G16 6656 G23 PIN FUNCTIONS GND*: Internal Function. This pin must be tied to ground. GND: Device Ground. NC: Not internally connected. May be tied to VIN, VOUT, GND or floated. VIN: Power Supply. Bypass VIN with a 0.1F capacitor to ground. VOUT: Output Voltage. An output capacitor of 1F minimum is required for stable operation. BLOCK DIAGRAM VIN NC VOUT ERROR AMP BANDGAP NC GND* GND 6656 BD 6656fa 9 LT6656 APPLICATIONS INFORMATION Long Battery Life Output Voltage Options Series references have a large advantage over shunt style references. Shunt references require a resistor from the power supply to operate. This resistor must be chosen to supply the maximum current that can be demanded by the load. When the load is not operating at this maximum current, the shunt reference must always sink this current, resulting in high dissipation and shortened battery life. The performance of the LT6656 is consistent for the 2.048V to 5V options. The 1.25V option has slightly reduced load regulation, and unlike the higher voltage options, the minimum operating supply voltage is limited by internal circuitry rather than the output voltage. The LT6656 series reference does not require a current setting resistor and is specified to operate with any supply from 1.5V to 18V, depending on the output voltage option, load current and operating temperature (see Dropout Voltage and Minimum Input Voltage in the Typical Performance Characteristics). When the load does not demand current, the LT6656 reduces its dissipation and battery life is extended. If the reference is not delivering load current, it dissipates only a few W, yet the same connection can deliver 5mA of load current when required. Start-Up To ensure proper start-up, the output voltage should be between -0.3V and the rated output voltage. If the output load may be driven more than 0.3V below ground, a low forward voltage schottky diode from the output to ground is required. The turn-on characteristics can be seen in Figure 1. VIN 1V/DIV VOUT 1ms/DIV 6656 F01 Parameters that are based on changes in the output voltage, such as load regulation and hysteresis, remain proportional to the output voltage and are specified in relative units, for example, parts per million (ppm). Parameters that are not based on changes in the output voltage, such as supply current and reverse input current, are the same for all options. The bandwidth of the LT6656 decreases with higher output voltage. This causes parameters that are affected by both bandwidth and output voltage, such as wideband noise and output impedance, to increase less with higher output voltage. Bypass and Load Capacitance The LT6656 voltage reference needs a 0.1F input bypass capacitor placed within an inch of the input pin. An additional 2.2F capacitor should be used when the source impedance of the input supply is high or when driving heavy loads. The bypassing of other local devices may serve as the required components. The output of the LT6656 requires a capacitance of 1F or larger. The LT6656 is stable with a wide variety of capacitor types including ceramic, tantalum and electrolytic due to its low sensitivity to ESR (5 or less). The test circuit in Figure 2 was used to test the response and stability of the LT6656 to various load currents. The resultant transient responses can be seen in Figure 3 and Figure 4. The large scale output response to a 500mV input step is shown in Figure 5 with a more detailed photo and description in the Output Settling section. Figure 1. LT6656-2.5 Turn-On Characteristics, CL = 1F VIN 3V CIN 0.1F R2 LT6656-2.5 3V VGEN CL 1F R1 2N7000 6656 F02 Figure 2. Transient Load Test Circuit 6656fa 10 LT6656 APPLICATIONS INFORMATION 0A IOUT 100A 2.52V VOUT 2.50V 2.48V 5ms/DIV 6656 F03 Figure 3. Transient Response, 0A to 100A Load Step (R2 = 24.9k, R1 = Open) 1mA IOUT 2mA In application circuits where the LT6656 is experiencing a load step greater than 5A, such as an ADC reference and supply implementation, the settling time will typically remain less than 8ms, regardless of the output settling from a previous load step. The settling time can be estimated by the following equation: 2.52V VOUT 2.50V Settling time 2.48V 5ms/DIV 6656 F04 Figure 4. Transient Response, 1mA to 2mA Load Step (R1 = R2 = 2.49k) VIN The settling time is typically less than 8ms for output loads up to 5mA, however the time required to settle when the load is turned off or in response to an input transient can be significantly longer due to the dead band (shown in Figure 7). During this interval the output stage is neither sourcing nor sinking current so the settling time is dominated by the ability of the application circuit to discharge the output capacitor to the voltage at which the sourcing circuitry in the output stage reactivates. Larger load currents will decrease the settling time and higher output capacitance will increase the settling time. 2(Deadband)(CL ) +(VOUT )(0.8ms/V) IL The deadband is 7mV for the 2.5V option, is proportional to the voltage option (i.e., 14mV for the 5V option) and can double due to variations in processing. The graph in Figure 6 shows the settling time versus load step with no load and with a constant 2A load applied. Note the settling time can be longer with load steps that are not large enough to activate the sinking side of the output stage. 3.25V 2.75V 2.7V 30 2.3V 5ms/DIV 6656 F05 Figure 5. Output Response to 0.5VP-P Step on VIN, CL = 1F, IL = 0 Output Settling The output of the LT6656 is primarily designed to source current into a load, but is capable of sinking current to aid in output transient recovery. The output stage uses a class B architecture to minimize quiescent current and has a crossover dead band as the output transitions from sourcing to sinking current. OUTPUT SETTLING TIME (ms) VOUT 2.5V 2.5V OPTION VIN = 3V 25 CL = 1F IL = LOAD STEP TO ZERO 20 15 IL = LOAD STEP TO 2A 10 5 0 0.001 IL = ZERO TO LOAD STEP 0.01 0.1 LOAD STEP (mA) 1 10 6656 F06 Figure 6. Output Settling Time to 0.05% vs Load Step 6656fa 11 LT6656 APPLICATIONS INFORMATION VIN input pulled to ground, the reverse output protection of the LT6656 limits the output current to typically less than 30A. The current versus reverse voltage is shown in the Typical Performance Characteristics section. 3.25V 2.75V IL = 0 Long-Term Drift VOUT 10mV/DIV The photo in Figure 7 shows the output response to a 0.5V input step in both a no-load and 5A load condition. In the no-load condition only the bias current of the internal bandgap reference (about 400nA) is available to discharge the output capacitor. Long-term drift cannot be extrapolated from accelerated high temperature testing. This erroneous technique gives drift numbers that are wildly optimistic. A more realistic way to determine long-term drift is to measure it over the time interval of interest. The LT6656 drift data was taken over 100 parts that were soldered onto PC boards in a typical application configuration. The boards were then placed into a constant temperature oven with TA = 30C, their outputs scanned regularly and measured with an 8.5 digit DVM. The parts chosen in the Long Term Drift curves in the Typical Performance Characteristics section represent high, low and typical units. Output Noise Hysteresis IL = 5A 5ms/DIV 6656 F07 Figure 7. Detailed Output Response to a 0.5V Input Step, CIN = CL = 1F Low frequency noise is proportional to the output voltage and is insensitive to output current and moderate levels of output capacitance. Wideband noise increases less with higher output voltage and is proportional to the bandwidth of the output stage, increasing with higher load current and lower output capacitance. Peaking in the noise response is another factor contributing to the output noise level for a given frequency range. Noise peaking can be reduced by increasing the size of the output capacitor when driving heavier loads, or conversely, reducing the size of the output capacitor when driving lighter loads. Noise plots in the Typical Performance Curves section show noise spectrum with various load currents and output capacitances. Internal Protection The LT6656 incorporates several internal protection features that make it ideal for use in battery powered systems. Reverse input protection limits the input current to typically less than 40A when either the LT6656 or the battery is installed backwards. In systems where the output can be held up by a backup battery with the Hysteresis on the LT6656 is measured in two steps, for example, from 25C to -40C to 25C, then from 25C to 85C to 25C, for the industrial temperature range. This two-step cycle is repeated several times and the maximum hysteresis from all the partial cycles is noted. Unlike other commonly used methods for specifying hysteresis, this ensures the worst-case hysteresis is included, whether it occurs in the first temperature excursion or the last. Results over both commercial and industrial temperature ranges are shown in Figure 8 and Figure 9. The parts cycled over the higher temperature range have a higher hysteresis than those cycled over the lower range. Power Dissipation The LT6656 will not exceed the maximum junction temperature when operating within its specified temperature range of -40C to 85C, maximum input voltage of 18V and specified load current of 5mA. IR Reflow Shift The different expansion and contraction rates of the materials that make up the LT6656 package may induce small stresses on the die that can cause the output to shift during 6656fa 12 LT6656 APPLICATIONS INFORMATION 30 NUMBER OF UNITS 2.5V OPTION VIN = 3V 25 CL = 1F IL = 0 300 0C TO 25C 70C TO 25C 380s TP = 260C TL = 217C TS(MAX) = 200C 225 20 TS = 190C 15 RAMP DOWN tP 30s T = 150C 150 tL 130s RAMP TO 150C 10 75 40s 5 120s 0 -60 -40 -20 0 20 HYSTERESIS (ppm) 40 0 60 0 2 6656 F08 Figure 8. 0C to 70C Hysteresis 20 18 7 2.5V OPTION VIN = 3V CL = 1F IL = 0 14 12 10 8 6 4 6656 F10 2.5V OPTION VIN = 3V 6 C = 1F L IL = 0 5 SOT-23 3 CYCLES 1 CYCLE 4 3 2 1 2 0 10 8 Figure 10. Lead Free Reflow Profile Due to IR Reflow NUMBER OF UNITS NUMBER OF UNITS 16 -40C TO 25C 85C TO 25C 4 6 MINUTES 0 -160 -120 -80 -40 0 40 80 120 160 HYSTERESIS (ppm) 0 20 60 100 140 180 220 CHANGE IN OUTPUT VOLTAGE (ppm) 6656 F11 6656 F09 Figure 9. -40C to 85C Hysteresis The lead free IR reflow profile used to experimentally measure the output voltage shift in the LT6656-2.5 is shown in Figure 10. Similar results can be expected using a convection reflow oven. Figures 11 and 12 show the change in output voltage that was measured for parts that were run through the reflow process for 1 cycle and also 3 cycles. Additional drift of the LT6656 after IR reflow does not vary significantly. 10 NUMBER OF UNITS IR reflow. Common lead free IR reflow profiles reach over 250C, considerably more than lead solder profiles. The higher reflow temperature of the lead free parts exacerbates the issue of thermal expansion and contraction causing the output shift to generally be greater than with a leaded reflow process. Figure 11. VOUT Due to IR Reflow, Peak Temperature = 260C, SOT-23 2.5V OPTION 9 VIN = 3V C = 1F 8 I L= 0 L 7 DFN 3 CYCLES 1 CYCLE 6 5 4 3 2 1 0 -160 240 -80 80 160 0 CHANGE IN OUTPUT VOLTAGE (ppm) 6656 F12 Figure 12. VOUT Due to IR Reflow, Peak Temperature = 260C, DFN 6656fa 13 LT6656 APPLICATIONS INFORMATION PC Board Layout The mechanical stress of soldering a surface mount voltage reference to a PC board can cause the output voltage to shift and temperature coefficient to change. To reduce the effects of stress-related shifts, position the reference near the short edge of the PC board or in a corner. In addition, slots can be cut into the board on two sides of the device. See Application Note AN82 for more information. http://www.linear.com The input and output capacitors should be mounted close to the package. The GND and VOUT traces should be as short as possible to minimize the voltage drops caused by load and ground currents. Excessive trace resistance directly impacts load regulation. TYPICAL APPLICATIONS Regulator Reference The robust input and output of the LT6656 along with its high output current make it an excellent precision low power regulator as well as a reference. The LT6656 would be a good match with a small, low power microcontroller. Using the LT6656 as a regulator reduces power consumption, decreases solution size and increases the accuracy of the microcontroller's on board ADC. only 27.4A. This system is greatly simplified because the precision reference does not need to be cycled on and off to save power. Furthermore, leaving the reference on continuously eliminates concern for turn-on settling time. 3V VIN 18V IN LT6656-2.5 OUT MCU 0.1F Low Power ADC Reference Low power ADCs draw only a few As during their idle period and well over 100A during conversions. Despite these surges of current, the ADC in reality can have very low power consumption. Figure 14 shows the LTC2480, a low power delta sigma ADC. When the ADC is disabled its quiescent current (IQ) is roughly 1A, during conversion the IQ jumps up to 160A. In reality, the power consumption is not only based on the IQ during conversion, but the real power consumption of the ADC is set by the conversion time and the sample rate. The LTC2480 shown in Figure 14 has a conversion time of 160ms which sets the maximum sample rate of 6 samples per second. The maximum sample rate also sets the maximum current consumption to 160A, but at slower sample rates the ADC will have significantly lower average current draw. If the ADC is sampled at 1 sample per second the average current drawn by the ADC during a 1 second interval would only be 26.4A. When taking into consideration the current drawn by the reference, the total current draw is VCC/VREF 10F PB0/AIN0/AREF/MOSI PB1/INT0/AIN1/MISO/OC1A PB2/ADC1/SCK/T0/INT0 PB3/ADC2 PB4/ADC3 PB5/RESET/ADC0 5 6 7 2 3 1 GND 6656 F13 Figure 13. Microcontroller Reference and Regulator 5.1V VIN 18V 0.1F IN LT6656-5 OUT 4.7F IN+ DIFFERENTIAL INPUT VREF * 0.5 (2.5V) REF VCC LTC2480 IN- AT 1sps, IQ = 27.4A CS SCK SDO 6656 F14 Figure 14. Low Power ADC Reference 6656fa 14 LT6656 TYPICAL APPLICATIONS Extended Supply Range Reference VCC UP TO 160V 330k MMBT5551 BZX584C12 0.1F 2.2F IN VOUT OUT LT6656-2.5 1F 6656 TA03 Boosted Output Current Reference 3.6V VCC 18V 220 + 10F 2N2905 0.1F IN VOUT 40mA MAX OUT LT6656-2.5 1F 6656 TA04 Micropower Regulator, IQ = 2A, Sink Up to 8mA 3V VCC 18V IN LT6656-2.5 + OUT 0.1F 1F 2.5V LT6003 - 6656 TA06 ADC Reference and Bridge Excitation Supply 3.8V VIN 18V IN 0.1F LT6656-3.3 3.3V VCC 5.5V OUT 1F 10k 0.1F 10k 0.1F IN- VCC LTC2452 IN+ 10k VREF 10F CS SCK SDO 0.1F 6656fa 15 LT6656 TYPICAL APPLICATIONS Low Power Precision High Voltage Supply Monitor, IQ = 1.4A, High Voltage Supply Load = 10A 100V 105V OVERVOLTAGE THRESHOLD VCC 9.53M 3 + 4 - 6.5V VCC 10V IN LT6656-5 OUT 0.1F 1F 475k 7 OVERVOLTAGE FLAG LTC1540 5 6 1, 2 6656 TA08 2-Terminal Current Source + + IN LT6656-1.25 GND 0.1F OUT VREF LT6003 R1 - 1F R2 R3 - IOUT = 6656 TA09 VREF R2 +1 R1 R3 Precision Current and Boosted Reference, IQ = 5.5A 249k 2N5086 VCC 1k + + - - LT6004 2.75V LT6004 200k 1A OUT 3V VCC 16V IN 0.1F LT6656-2.5 2M OUT 2.5V 1F 6656 TA10 6656fa 16 LT6656 PACKAGE DESCRIPTION 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 REV B 6656fa 17 LT6656 PACKAGE DESCRIPTION DC6 Package 6-Lead Plastic DFN (2mm x 2mm) (Reference LTC DWG # 05-08-1703 Rev B) 0.70 0.05 2.55 0.05 1.15 0.05 0.61 0.05 (2 SIDES) PACKAGE OUTLINE 0.25 0.05 0.50 BSC 1.42 0.05 (2 SIDES) RECOMMENDED SOLDER PAD PITCH AND DIMENSIONS R = 0.125 TYP 0.56 0.05 (2 SIDES) 0.40 0.10 4 6 2.00 0.10 (4 SIDES) PIN 1 BAR TOP MARK (SEE NOTE 6) PIN 1 NOTCH R = 0.20 OR 0.25 x 45 CHAMFER R = 0.05 TYP 0.200 REF 0.75 0.05 3 (DC6) DFN REV B 1309 1 0.25 0.05 0.50 BSC 1.37 0.05 (2 SIDES) 0.00 - 0.05 BOTTOM VIEW--EXPOSED PAD NOTE: 1. DRAWING TO BE MADE A JEDEC PACKAGE OUTLINE M0-229 VARIATION OF (WCCD-2) 2. DRAWING NOT TO SCALE 3. ALL DIMENSIONS ARE IN MILLIMETERS 4. DIMENSIONS OF EXPOSED PAD ON BOTTOM OF PACKAGE DO NOT INCLUDE MOLD FLASH. MOLD FLASH, IF PRESENT, SHALL NOT EXCEED 0.15mm ON ANY SIDE 5. EXPOSED PAD SHALL BE SOLDER PLATED 6. SHADED AREA IS ONLY A REFERENCE FOR PIN 1 LOCATION ON THE TOP AND BOTTOM OF PACKAGE 6656fa 18 LT6656 REVISION HISTORY REV DATE DESCRIPTION PAGE NUMBER A 7/10 Voltage options added (1.25, 2.048, 3, 3.3), reflected throughout the data sheet 1 to 18 B 5/11 Added 6-lead DFN package reflected throughout the data sheet. 1 to 20 6656fa Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology Corporation makes no representation that the interconnection of its circuits as described herein will not infringe on existing patent rights. 19 LT6656 TYPICAL APPLICATION Reference Regulator for Micropower DAC, Total IQ = 4.8A 5.1V VIN 18V IN LT6656-5 OUT 0.1F 5V 10F VREF VCC CS SCK SDI DAC A 0V TO 5V OUTPUT DAC B 0V TO 5V OUTPUT LTC1662 GND 6656 TA07 RELATED PARTS PART NUMBER DESCRIPTION COMMENTS LT1389 Nanopower Precision Shunt Voltage Reference 0.05% Max 10ppm/C Max, 800nA Supply LTC1440 Micropower Comparator with Reference 3.7A Max Supply Current, 1% 1.182V Reference, MSOP, PDIP and SO-8 Packages LT1460 Micropower Series Reference 0.075% Max, 10ppm/C Max Drift, 2.5V, 5V and 10V Versions,MSOP, PDIP, SO-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 LT1495 1.5A Precision Rail-to-Rail Dual Op Amp 1.5A Max Supply Current, 100pA Max IOS LTC1540 Nanopower Comparator with Reference 600nA Max Supply Current, 2% 1.182V Reference, MSOP and SO-8 Packages LT1634 Micropower Precision Shunt Voltage Reference 0.05% Max, 10ppm/C Max Drift, 1.25V, 2.5V, 4.096V, 5V, 10A Maximum Supply Current LT1790 Micropower Precision Series Reference 0.05% Max, 10ppm/C Max, 60A Supply, SOT23 Package LTC1798 6A Low Dropout Series Reference Available in Adjustable, 2.5V, 3V, 4.096V and 5V LT6003 1.6V, 1A Precision Rail-to-Rail Op Amp 1A Max Supply Current, 1.6V Minimum Operating Voltage, SOT-23 Package LT6650 Micropower Reference with Buffer Amplifier 0.05% Max, 5.6A Supply, SOT-23 Package LT6660 Tiny Micropower Series Reference 0.2% Max, 20ppm/C Max, 20mA Output Current, 2mm x 2mm DFN LT6700 Micropower, Low Voltage Dual Comparator with 40mV Reference 6.5A Supply Current, 1.4V Minimum Operating Voltage 6656fa 20 Linear Technology Corporation LT 0511 REV B * PRINTED IN USA 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 FAX: (408) 434-0507 www.linear.com LINEAR TECHNOLOGY CORPORATION 2010