LTC6255/LTC6256/LTC6257 6.5MHz, 65µA Power Efficient Rail-to-Rail I/O Op Amps Description Features n n n n n n n n n n n n n n Gain Bandwidth Product: 6.5MHz –3dB Bandwidth (AV = +1): 4.5MHz Low Quiescent Current: 65µA Stable for Capacitive Load Up to 100nF Offset Voltage: 350µV Maximum Rail-to-Rail Input and Output Supply Voltage Range: 1.8V to 5.25V Input Bias Current: 35nA Maximum CMRR/PSRR: 100dB/100dB Shutdown Current: 7µA Maximum Operating Temperature Range: –40°C to 125°C Single in 6-Lead TSOT-23 Package Dual in 8-Lead MS8, MS10, TS0T-23, 2mm × 2mm Thin DFN Packages Quad in MS16 Package The LTC®6255/LTC6256/LTC6257 are single/dual/quad operational amplifiers with low noise, low power, low supply voltage, rail-to-rail input/output. They are unity gain stable with capacitive load up to 100nF. They feature 6.5MHz gain-bandwidth product, 1.8V/µs slew rate while consuming only 65µA of supply current per amplifier operating on supply voltages ranging from 1.8V to 5.25V. The combination of low supply current, low supply voltage, high gain bandwidth product and low noise makes the LTC6255 family unique among rail-to-rail input/output op amps with similar supply currents. These operational amplifiers are ideal for low power and low noise applications. For applications that require power-down, LTC6255 and LTC6256 in S6 and MS10 packages offer shutdown pins which reduces the current consumption to 7µA maximum. Applications n n n n The LTC6255 family can be used as plug-in replacements for many commercially available op amps to reduce power or to improve input/output range and performance. Micropower Active Filters Portable Instrumentation Battery or Solar Powered Systems Automotive Electronics L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and Over-The-Top is a trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners. Typical Application LTC6255 Driving LTC2361 ADC Low Power, Low Distortion ADC Driver 0 3.3V –20 + LTC6255 – 324Ω 1% 470pF NPO VDD AIN VREF LTC2361 GND –30 CS SDO SCK OVDD MAGNITUDE (dB) 3.3V VIN 5mV TO 2V VIN = –1dBFS, 5kHz fS = 125kSps SNR = 72.5dB SFDR = 89dB tACQ = 5µs tCONV = 3µs –10 –40 –50 –60 –70 –80 10k 1% 625567 TA01a 6.34k, 1% –90 –100 22pF ISUPPLY = 540µA TOTAL AT 125kSps –110 0 10 20 30 40 FREQUENCY (kHz) 50 60 625567 TA01b 625567f LTC6255/LTC6256/LTC6257 Absolute Maximum Ratings (Note 1) Supply Voltage: V+ – V–............................................5.5V Input Voltage ................................... V– – 0.2 to V+ + 0.2 Input Current: +IN, –IN, SHDN (Note 2)................ ±10mA Output Current: OUT............................................ ±20mA Output Short-Circuit Duration (Note 3)............. Indefinite Operating Temperature Range (Note 4)................................................... –40°C to 125°C Specified Temperature Range (Note 5)................................................... –40°C to 125°C Storage Temperature Range................... –65°C to 150°C Junction Temperature............................................ 150°C Lead Temperature (Soldering, 10 sec) S6, TS8, MS8, MS only.......................................... 300°C Pin Configuration TOP VIEW 2 +INA 3 V – – + 9 V– 4 V+ 7 OUTB 6 –INB V– 2 +INB +IN 3 5 KC PACKAGE 8-LEAD (2mm s 2mm) PLASTIC UTDFN TJMAX = 125°C, θJA = 89°C/W (NOTE 6) EXPOSED PAD (PIN 9) IS V–, MUST BE SOLDERED TO PCB 6 V+ OUT 1 4 –IN S6 PACKAGE 6-LEAD PLASTIC TSOT-23 TJMAX = 150°C, θJA = 192°C/W (NOTE 6) TOP VIEW 1 2 3 4 8 7 6 5 – + + – OUTA –INA +INA V– V+ OUTB –INB +INB TS8 PACKAGE 8-LEAD PLASTIC TSOT-23 TJMAX = 150°C, θJA = 195°C/W (NOTE 6) 5 SHDN + – –INA TOP VIEW 8 TOP VIEW OUTA –INA +INA V– 1 2 3 4 – + 8 7 6 5 + – 1 + – OUTA V+ OUTB –INB +INB MS8 PACKAGE 8-LEAD PLASTIC MSOP TJMAX = 150°C, θJA = 163°C/W (NOTE 6) TOP VIEW 1 2 3 4 5 – + + – OUTA –INA +INA V– SHDNA 10 9 8 7 6 V+ OUTB –INB +INB SHDNB MS PACKAGE 10-LEAD PLASTIC MSOP TJMAX = 150°C, θJA = 160°C/W (NOTE 6) OUTA –INA +INA V+ +INB –INB OUTB NC 1 2 3 4 5 6 7 8 – + + – + – TOP VIEW + – 16 15 14 13 12 11 10 9 OUTD –IND +IND V– +INC –INC OUTC NC MS PACKAGE 16-LEAD PLASTIC MSOP TJMAX = 150°C, θJA = 125°C/W (NOTE 6) 625567f LTC6255/LTC6256/LTC6257 Order Information LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION SPECIFIED TEMPERATURE RANGE (Notes 4,5) LTC6255CS6#TRMPBF LTC6255CS6#TRPBF LTFFT 6-Lead Plastic TSOT-23 0°C to 70°C LTC6255IS6#TRMPBF LTFFT 6-Lead Plastic TSOT-23 –40°C to 85°C LTC6255HS6#TRMPBF LTC6255HS6#TRPBF LTFFT 6-Lead Plastic TSOT-23 –40°C to 125°C LTC6256CTS8#TRMPBF LTC6256CTS8#TRPBF LTFFW 8-Lead Plastic TSOT-23 0°C to 70°C LTC6256ITS8#TRMPBF LTC6256ITS8#TRPBF LTFFW 8-Lead Plastic TSOT-23 –40°C to 85°C LTC6256HTS8#TRMPBF LTC6256HTS8#TRPBF LTFFW 8-Lead Plastic TSOT-23 –40°C to 125°C LTC6255IS6#TRPBF LTC6256CKC#TRMPBF LTC6256CKC#TRPBF DXYT 8-Lead (2mm × 2mm) Plastic UTDFN 0°C to 70°C LTC6256IKC#TRMPBF LTC6256IKC#TRPBF DXYT 8-Lead (2mm × 2mm) Plastic UTDFN –40°C to 85°C LTC6256CMS8#PBF LTC6256CMS8#TRPBF LTDXW LTC6256IMS8#PBF LTC6256IMS8#TRPBF LTC6256CMS#PBF LTC6256CMS#TRPBF LTC6256IMS#PBF LTC6257CMS#PBF 8-Lead Plastic MSOP 0°C to 70°C LTDXW 8-Lead Plastic MSOP –40°C to 85°C LTDXX 10-Lead Plastic MSOP 0°C to 70°C LTC6256IMS#TRPBF LTDXX 10-Lead Plastic MSOP –40°C to 85°C LTC6257CMS#TRPBF 6257 16-Lead Plastic MSOP 0°C to 70°C LTC6257IMS#PBF LTC6257IMS#TRPBF 6257 16-Lead Plastic MSOP –40°C to 85°C LTC6257HMS#PBF LTC6257HMS#TRPBF 6257 16-Lead Plastic MSOP –40°C to 125°C 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/ 5V Electrical Characteristics The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VSUPPLY = 5V, VCM = VOUT = VSUPPLY/2, CL = 10pF, VSHDN is unconnected. SYMBOL PARAMETER VOS Input Offset Voltage CONDITIONS VCM MIN TYP MAX UNITS –350 –700 100 l 350 700 µV µV –350 –700 100 l 350 700 µV µV = V– + 2.5V (PNP Region) VCM = V+ – 0.3V (NPN Region) VOS TC IB Input Offset Voltage Drift Input Bias Current (Note 7) VCM = V– + 2.5V, V+ – 0.3V VCM Input Offset Current –35 –60 –5 35 60 nA nA –35 –60 5 l 35 60 nA nA –15 –30 2 l 15 30 nA nA –15 –30 2 l 15 30 nA nA VCM = V– + 2.5V VCM = V+ – 0.3V en Input Voltage Noise Density f = 1kHz µV/°C l VCM = V+ – 0.3V IOS 1.5 l = V– + 2.5V 20 nV/√Hz Input Noise Voltage f = 0.1Hz to 10Hz 2.5 µVP-P in Input Current Noise Density f = 1kHz, VCM = 0V to 4V (PNP Input) f = 1kHz, VCM = 4V to 5V (NPN Input) 380 850 fA/√Hz fA/√Hz RIN Input Resistance Differential Common Mode 1 10 MΩ MΩ CIN Input Capacitance Differential Common Mode 0.4 0.3 pF pF 625567f LTC6255/LTC6256/LTC6257 5V Electrical Characteristics The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VSUPPLY = 5V, VCM = VOUT = VSUPPLY/2, CL = 10pF, VSHDN is unconnected. SYMBOL PARAMETER CMRR Common Mode Rejection Ratio IVR Input Voltage Range PSRR Power Supply Rejection Ratio AV Large Signal Gain CONDITIONS MIN TYP 80 76 100 l l –0.1 85 81 100 l dB dB 50 28 200 l V/mV V/mV 25 8 50 l V/mV V/mV VCM = 0.3V to 3.5V VCM = 0.4V, VS Ranges From 1.8V to 5V VO = 0.5V to 4.5V, RLOAD = 100k VO = 0.5V to 4.5V, RLOAD = 10k VOL Output Swing Low (Input Overdrive 30mV). Measured from V– No Load 25 35 mV mV 10 30 40 mV mV 30 75 95 mV mV 24 55 60 mV mV 30 80 90 mV mV 75 150 170 mV mV l VOH Output Swing High (Input Overdrive 30mV). Measured from V+ No Load l ISOURCE = 100µA l ISOURCE = 1mA l ISC IS Output Short-Circuit Current V 6 l ISINK = 1mA UNITS dB dB 5.1 l ISINK = 100µA MAX 17 8 35 l 57 42 65 l 73 88 µA µA 6 7 12 µA µA Supply Current per Amplifier Supply Current in Shutdown l ISHDN Shutdown Pin Current VSHDN = 0.6V VSHDN = 1.5V l –1400 –1000 l –900 –500 VIL SHDN Input Low Voltage Disable l VIH SHDN Input High Voltage Enable l mA mA nA nA 0.6 1.5 V V tON Turn-On Time 5 µs tOFF Turn-Off Time 3 µs BW –3dB Closed Loop Bandwidth AV = 1 GBW Gain-Bandwidth Product f = 200kHz l tS Settling Time, 0.5V to 4.5V, Unity Gain 0.1% 0.01% SR Slew Rate AV = –1, VOUT = 0.5V to 4.5V, CLOAD = 10pF, RF = RG = 10kΩ FPBW Full Power Bandwidth (Note 8) 4VP-P THD+N Total Harmonic Distortion and Noise f = 500Hz, AV = 2, RL = 4kΩ, VOUTP-P = 1V VIN = 2.25V to 2.75V ILEAK Output Leakage Current in Shutdown VSHDN = 0V, VOUT = 0V VSHDN = 0V, VOUT = 5V 2.5 2 4.5 MHz 6.5 MHz MHz 4 6 l l l 1.0 0.75 –400 –400 µs µs 1.8 V/µs V/µs 140 kHz 0.0022 93 % dB 400 400 nA nA 625567f LTC6255/LTC6256/LTC6257 1.8V Electrical Characteristics The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VSUPPLY = 1.8V, VCM = VOUT = 0.4V, CL = 10pF, VSHDN is unconnected. SYMBOL PARAMETER VOS Input Offset Voltage CONDITIONS VCM MIN TYP MAX UNITS –350 –700 100 l 350 700 µV µV –350 –700 100 l 350 700 µV µV = V– + 0.3V VCM = V+ – 0.3V VOS TC Input Offset Voltage Drift VCM = V– + 0.3V, V+ – 0.3V IB Input Bias Current (Note 7) VCM = V– + 0.3V Input Offset Current µV/°C –8 l –35 –60 35 60 nA nA –35 –60 5 l 35 60 nA nA –15 –30 2 l 15 30 nA nA –15 –30 2 l 15 30 nA nA VCM = V+ – 0.3V IOS 1.5 l VCM = V– + 0.3V VCM = V+ – 0.3V Input Voltage Noise Density f = 1kHz, VCM = 0.4V 21 nV/√Hz Input Noise Voltage f = 0.1Hz to 10Hz 2.5 µVP-P in Input Current Noise Density f = 1kHz, VCM = 0V to 0.8V (PNP Input) f = 1kHz, VCM = 1V to 1.8V (NPN Input) 580 870 fA/√Hz fA/√Hz RIN Input Resistance Differential Common Mode 1 10 MΩ MΩ CIN Input Capacitance Differential Common Mode 0.4 0.3 pF pF CMRR Common Mode Rejection Ratio VCM = 0.2V to 1.6V 90 dB dB en IVR Input Voltage Range PSRR Power Supply Rejection Ratio VCM = 0.4V, VS Ranges From 1.8V to 5V AV Large Signal Gain VO = 0.5V to 1.3V, RLOAD = 100k l 74 67 l –0.1 100 l 85 81 dB dB 30 17 110 l V/mV V/mV 15 5 50 l V/mV V/mV VO = 0.5V to 1.3V, RLOAD = 10k VOL Output Swing Low (Input Overdrive 30mV), Measured from V– No Load 1.9 6 35 40 mV mV 10 40 45 mV mV 30 75 90 mV mV l ISINK = 100µA l ISINK = 1mA l V 625567f LTC6255/LTC6256/LTC6257 1.8V Electrical Characteristics The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VSUPPLY = 1.8V, VCM = VOUT = 0.4V, CL = 10pF, VSHDN is unconnected. SYMBOL PARAMETER VOH Output Swing High (Input Overdrive 30mV), Measured from V+ CONDITIONS MIN No Load TYP MAX 24 55 60 mV mV 30 65 75 mV mV 75 135 150 mV mV l ISOURCE = 100µA l ISOURCE = 1mA l ISC IS Output Short-Circuit Current UNITS 12.5 3.5 17 l 53 35 60 l 68 83 µA µA 1.4 2.0 3.0 µA µA Supply Current per Amplifier Supply Current in Shutdown l ISHDN Shutdown Pin Current VSHDN = 0.5V VSHDN = 1.3V l l VIL SHDN Input Low Voltage Disable l VIH SHDN Input High Voltage Enable l –480 –160 mA mA –350 –40 nA nA 0.5 1.3 V V tON Turn-On Time 5 µs tOFF Turn-Off Time 3 µs BW –3dB Closed Loop Bandwidth AV = 1 4 MHz GBW Gain-Bandwidth Product f = 200kHz 6 MHz MHz 4 6 µs µs l TS Settling Time, 0.3V to 1.5V, Unity Gain 0.1% 0.01% SR Slew Rate AV = –1, VOUT = 0.3V to 1.5V, CLOAD = 10pF l FPBW Full Power Bandwidth (Note 8) 1.2VP-P THD+N Total Harmonic Distortion and Noise f = 500Hz, AV = 2, RL = 4kΩ, VOUTP-P = 1V VIN = 0.25V to 0.75V 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 inputs are protected by back-to-back diodes as well as ESD protection diodes to each power supply. If the differential input voltage exceeds 3.6V or the input extends more than 500mV beyond the power supply, the input current should be limited to less than 10mA. Note 3: A heat sink may be required to keep the junction temperature below the absolute maximum rating when the output is shorted indefinitely. Note 4: The LTC6255C/LTC6256C/LTC6257C and LTC6255I/LTC6256I/ LTC6257I are guaranteed functional over the temperature range of –40°C to 85°C. The LTC6255H/LTC6256H/LTC6257H are guaranteed functional over the temperature range of –40°C to 125°C. 2.4 1.8 0.9 0.75 1.5 V/µs V/µs 400 kHz 0.006 84 % dB Note 5: The LTC6255C/LTC6256C/LTC6257C are guaranteed to meet the specified performance from 0°C to 70°C. The LTC6255C/LTC6256C/ LTC6257C are designed, characterized and expected to meet specified performance from –40°C to 85°C but are not tested or QA sampled at these temperatures. The LTC6255I/LTC6256I/LTC6257I are guaranteed to meet specified performance from –40°C to 85°C. The LTC6255H/ LTC6256H/LTC6257H are guaranteed to meet specified performance from –40°C to 125°C. Note 6: Thermal resistance varies with the amount of PC board metal connected to the package. The specified values are for short traces connected to the leads. Note 7: The input bias current is the average of the currents through the positive and negative input pins. Note 8: Full power bandwidth is calculated from the slew rate FPBW = SR/π • VP-P. 625567f LTC6255/LTC6256/LTC6257 Typical Performance Characteristics Input VOS Histogram 140 VS = ±2.5V VCM = 0V NUMBER OF UNITS 100 50 100 80 60 40 20 0 –1000 20 500 0 –1000 1000 –600 625567 G01 500 H-GRADE INDUSTRIAL COMMERCIAL 16 VS = ±2.5V VCM = 0V 10 8 –200 200 VOS (µV) 600 625567 G03 VOS vs Common Mode Voltage 500 VCM = 0.4V 300 300 200 200 100 100 0 –100 0 –100 6 –200 –200 4 –300 –300 2 –400 –400 0 –3.5 –500 1.8 –2.5 –1.5 –0.5 0 0.5 DISTRIBUTION (µV/°C) 1.5 2.3 2.8 3.3 3.8 4.3 SUPPLY VOLTAGE (V) 100 INPUT BIAS CURRENT (nA) 0 –5 –55°C, 25°C 125°C –10 –15 –20 –25 100 40 20 +IN –20 –IN –40 –60 –80 –5 –4 –3 –2 –1 0 1 IOUT (mA) 2 3 4 5 625567 G07 –100 4 3 5 625567 G06 VS = 1.8V, 0V 80 60 0 2 Input Bias Current vs Common Mode Voltage VS = 5V, 0V 80 10 1 VCM (V) Input Bias Current vs Common Mode Voltage VOS vs IOUT 15 0 625567 G05 VS = ±2.5V 20 VCM = 0V 5 –500 4.8 INPUT BIAS CURRENT (nA) 25 VS = 5V, 0V 400 625567 G04 VOS (mV) 1000 625567 G02 VOS vs Supply Voltage (25°C) 400 VOS (µV) 12 0 VOS (µV) VOS TC (–40°C to 125°C) 18 14 –500 300 VS = ±2.5V 250 VCM = 0V 200 150 100 50 0 –50 –100 –150 –200 –250 –300 –350 –400 –40 –25 –10 5 20 35 50 65 80 95 110 125 TEMPERATURE (°C) VOS (µV) NUMBER OF UNITS 150 VOS vs Temperature VS = ±2.5V VCM = 2.2V 120 200 VOS (µV) Input VOS Histogram VOS (µV) 250 60 40 20 +IN 0 –IN –20 –40 –60 –80 0 1 2 3 VCM (V) 4 5 625567 G08 –100 0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 VCM (V) 625567 G09 625567f LTC6255/LTC6256/LTC6257 Typical Performance Characteristics Input Bias Current vs Supply Voltage 50 15 10 5 0 –5 +IN –10 –15 –IN –20 100 VS = ±2.5V 40 30 20 10 0 –10 –20 VCM = –2V –30 –50 –40 4.8 10 60 TEMPERATURE (°C) 60 VS = 1.8V, 0V 40 20 0 –40 –15 10 35 60 85 TEMPERATURE (°C) 110 –0.05 –0.10 –0.15 –0.20 –0.25 125°C, VS = 5V 85°C, VS = 5V 25°C, VS = 5V –40°C, VS = 5V –0.30 –0.35 0 1 2 3 LOAD CURRENT (mA) 4 100 MAXIMUM SINKING CURRENT (mA) 50 125°C 40 –40°C 30 20 25°C 10 0 1.8 2.3 2.8 3.3 3.8 4.3 SUPPLY VOLTAGE (V) 4.8 625567 G16 5 0.5 90 0.3 0.2 0.1 0 0 1 2 3 LOAD CURRENT (mA) 4 5 625567 G15 0.1Hz to 10Hz Output Voltage Noise 5 VS = ±2.5V 4 VCM = 0V AV = 1 3 VCM = 0.4V 80 70 –40°C 60 50 25°C 40 30 20 2 1 0 –1 –2 –3 125°C 10 0 1.8 5 125°C, VS = 1.8V 125°C, VS = 5V 85°C, VS = 1.8V 85°C, VS = 5V 25°C, VS = 1.8V 25°C, VS = 5V –40°C, VS = 1.8V –40°C, VS = 5V 0.4 Output Short-Circuit Current vs Supply Voltage (Sinking) VCM = 0.4V 60 4 625567 G14 Output Short-Circuit Current vs Supply Voltage (Sourcing) 70 2 3 SUPPLY VOLTAGE (V) Output Saturation Voltage vs Load Current (Output Low) 125°C, VS = 1.8V 85°C, VS = 1.8V 25°C, VS = 1.8V –40°C, VS = 1.8V 625567 G13 80 1 625567 G32 Output Saturation Voltage vs Load Current (Output High) SATURATION VOLTAGE FROM TOP RAIL (V) SUPPLY CURRENT (µA) VS = 5V, 0V 0 625567 G11 0 VCM = 0.4V 80 MAXIMUM SOURCING CURRENT (mA) –40°C 40 0 110 SATURATION VOLTAGE FROM BOTTOM RAIL (V) 2.8 3.8 SUPPLY VOLTAGE (V) Supply Current vs Temperature 90 25°C 60 20 625567 G10 100 125°C –40 –25 1.8 100 VCM = 0.4V 80 VCM = 2V SUPPLY CURRENT (µA) VCM = 0.4V INPUT BIAS CURRENT (nA) INPUT BIAS CURRENT (nA) 20 NOISE VOLTAGE (µV) 25 Supply Current vs Supply Voltage per Channel, –40°C, 25°C, 125°C Input Bias Current vs Temperature 2.3 2.8 3.3 3.8 4.3 SUPPLY VOLTAGE (V) –4 4.8 625567 G17 –5 0 2 4 6 TIME (s) 8 10 625567 G18 625567f LTC6255/LTC6256/LTC6257 300 VS = ±2.5V VCM = 0V 250 200 150 100 50 0 1 10 100 1k FREQUENCY (Hz) 10k 100k Wide Band Noise Voltage Density vs Frequency VS = ±2.5V 70 VCM = 0V 60 50 40 30 20 10 0 0 2M 4M FREQUENCY (Hz) 6M 625567 G19 625567 G20 Total Harmonic Distortion and Noise 1 1 0.01 0.1 1kHz 1 VOUTP-P (V) 10 625567 G22 0.001 0.01 500Hz 0.1 VOUTP-P (V) 10 5 0 1 10 100 1k FREQUENCY (Hz) 10k 50 625567 G23 –100 –110 30 10 –70 –90 PHASE 40 20 –60 –80 60 –120 MAGNITUDE –130 0 –140 –10 –150 –20 10k 1 VS = ±2.5V VCM = 0V 70 AMPLITUDE (dB) THD+N (%) 0.001 0.01 15 80 VS = ±2.5V VCM = 0V AV = 2 RF = RG = 10kΩ 500Hz 20 100k 1M FREQUENCY (Hz) PHASE 1kHz VS = ±2.5V VCM = 0V Gain and Phase vs Frequency 0.1 THD+N (%) 0.1 25 625567 G21 Total Harmonic Distortion and Noise VS = ±0.9V VCM = 0V AV = 2 RG = RF = 10kΩ 0.01 Input Noise Current vs Frequency 80 INPUT REFERRED NOISE CURRENT (pA/√Hz) Noise Voltage Density vs Frequency INPUT REFERRED NOISE VOLTAGE DENSITY (nV/√Hz) INPUT REFERRED NOISE VOLTAGE DENSITY (nV/√Hz) Typical Performance Characteristics –160 10M 625567 G24 625567f LTC6255/LTC6256/LTC6257 Typical Performance Characteristics Common Mode Rejection Ratio vs Frequency Slew Rate vs Supply Voltage 150 2.5 Power Supply Rejection Ratio vs Frequency 150 VS = ±2.5V VCM = 0V V+, VS = 1.8V, 0V V+, VS = 5V, 0V V–, VS = 1.8V, 0V V–, VS = 5V, 0V RISING 100 1.5 PSSR (dB) FALLING 1.0 100 CMMR (dB) 50 V – = 0V 0.5 S VSTEP = VS+ – 1V AV = 1 RF = RG = 10kΩ 0 1.5 2.5 3.5 4.5 VS+, SUPPLY VOLTAGE (V) 0 5.5 50 1k 0.1 1 10 100 FREQUENCY (Hz) 1k 10k 625567 G27 Large-Signal Response Large-Signal Response 2.5 VS = ±2.5V 14 VCM = 0V AV = 1 V = ±2V 12 IN 0.9 2.0 1.0 10 8 6 0.5 0 –0.5 –10 4 CLOAD = 10pF CLOAD = 100pF CLOAD = 1nF CLOAD = 10nF –1.5 2 –2.0 1 CLOAD (nF) 10 100 625567 G28 0.6 VS = ±2.5V AV = 1 RLOAD = 10kΩ 1.5 VOLTAGE (V) OVERSHOOT (%) 0 0.001 0.01 10M 625567 G26 16 0.1 100k 1M FREQUENCY (Hz) 625567 G25 Capacitive Load Handling Overshoot vs Capacitive Load 0 0.01 10k VOLTAGE (V) SLEW RATE (V/µs) 2.0 –2.5 0 20 40 60 TIME (ms) VS = ±0.9V AV = 1 RLOAD = 10kΩ 0.3 0 –0.3 CLOAD = 10pF CLOAD = 100pF CLOAD = 1nF CLOAD = 10nF –0.6 80 100 625567 G29 –0.9 0 20 60 40 TIME (µs) 80 100 625567 G30 625567f 10 LTC6255/LTC6256/LTC6257 Typical Performance Characteristics Large-Signal Response Small-Signal Response VS = ±0.9V AV = 1 RLOAD = 10kΩ 0.04 0.03 VOLTAGE (V) 0.04 0 –0.01 –0.02 CLOAD = 10pF CLOAD = 100pF CLOAD = 1nF CLOAD = 10nF –0.03 –0.04 0 20 40 60 TIME (µs) 80 0.5 100 –0.5 –0.02 –0.03 –2.0 –0.04 0 20 80 100 –0.05 VS = 1.8V, 0V 70 VCM = 0.4V AV = 10 1 AV = 1 0.1 1k 10k 625567 G12 200 400 600 TIME (µs) 800 60 90 VS = 5V, 0V 80 VCM = 0.4V 125°C –40°C 50 25°C 40 30 20 0 1000 Supply Current vs SHDN Pin Voltage 10 1 10 100 FREQUENCY (Hz) 0 625567 G34 80 SUPPLY CURRENT (µA) OUTPUT IMPEDANCE (Ω) 40 60 TIME (µs) Supply Current vs SHDN Pin Voltage 100 0.1 –0.01 625567 G33 VS = ±2.5V VCM = 0V 0.01 0.01 0 –1.5 Output Impedance vs Frequency 10 0.01 –1.0 625567 G31 1000 0.02 0 –2.5 VS = ±2.5V AV = 1 CLOAD = 100nF 0.03 VS = ±2.5V AV = 1 CLOAD = 100nF SUPPLY CURRENT (µA) VOLTAGE (V) 2.0 1.0 0.01 –0.05 0.05 1.5 0.02 Small-Signal Response 2.5 VOLTAGE (V) 0.05 –40°C 70 25°C 60 125°C 50 40 30 20 10 0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 VSHDN (V) 625567 G35 0 0 0.2 0.4 0.6 0.8 1.0 VSHDN (V) 1.2 1.4 1.6 625567 G36 625567f 11 LTC6255/LTC6256/LTC6257 Pin Functions V–: Negative Power Supply. It is normally tied to ground. It can also be tied to a voltage other than ground as long as the voltage between V+ and V– is from 1.8V to 5.25V. If it is not connected to ground, bypass it with a capacitor of 0.1µF as close to the part as possible. –IN: Inverting Input of the Amplifier. Voltage range of this pin can go from V– – 0.1V to V+ + 0.1V. +IN: Non-Inverting Input of Amplifier. This pin has the same voltage range as –IN. V+: Positive Power Supply. Typically the voltage is from 1.8V to 5.25V. Split supplies are possible as long as the voltage between V+ and V– is between 1.8V and 5.25V. A bypass capacitor of 0.1µF as close to the part as possible should be used between power supply pins or between supply pins and ground. SHDN: Active Low Shutdown. Shutdown threshold is 0.6V above negative rail. If left unconnected, the amplifier will be on. OUT: Amplifier Output. The voltage range extends to within millivolts of each supply rail. Simplified Schematic V+ R6 5M + R3 V+ I2 R5 Q15 V– ESDD1 R4 + ESDD2 C2 I1 Q12 Q11 ESDD5 Q13 +IN SHDN LOGIC D6 D8 D5 D7 Q5 Q4 –IN ESDD4 – V Q3 + VBIAS Q1 CC Q2 ESDD3 Q9 V– BUFFER AND OUTPUT BIAS Q10 V+ OUT I3 ESDD6 Q8 Q16 C1 Q17 Q18 Q19 Q7 Q14 Q6 R1 V– R2 625567 F01 Figure 1. LTC6255/LTC6256/LTC6257 Simplified Schematic 625567f 12 LTC6255/LTC6256/LTC6257 Operation The LTC6255 family input signal range extends beyond the negative and positive power supplies. The output can even extend all the way to the negative supply with the proper external pull-down current source. Figure 1 depicts a Simplified Schematic of the amplifier. The input stage is comprised of two differential amplifiers, a PNP stage Q1/Q2 and NPN stage Q3/Q4 that are active over different ranges of common mode input voltage. The PNP stage is active between the negative power supply to approximately 1V below the positive supply. As the input voltage approaches the positive supply, transistor Q5 will steer the tail current I1 to the current mirror Q6/Q7, activating the NPN differential pair and the PNP pair becomes inactive for the remaining input common mode range. Also for the input stage, devices Q17, Q18 and Q19 act to cancel the bias current of the PNP input pair. When Q1/Q2 is active, the current in Q16 is controlled to be the same as the current Q1/Q2. Thus, the base current of Q16 is normally equal to the base current of the input devices of Q1/Q2. Similar circuitry (not shown) is used to cancel the base current of Q3/Q4. The buffer and output bias stage uses a special compensation technique to take full advantage of the process technology to drive high capacitive loads. The common emitter topology of Q14/Q15 enables the output to swing from rail to rail. Applications Information Low Supply Voltage and Low Power Consumption Low Input Referred Noise The LTC6255 family of operational amplifiers can operate with power supply voltages from 1.8V to 5.25V. Each amplifier draws only 65µA. The low supply voltage capability and low supply current are ideal for portable applications. The LTC6255 family provides a low input referred noise of 20nV/√Hz at 1kHz. The noise density will grow slowly with the frequency in wideband range. The average noise voltage density over 3MHz range is less than 24nV/√Hz. The LTC6255 family is ideal for low noise and low power signal processing applications. High Capacitive Load Driving Capability and Wide Bandwidth The LTC6255 family is optimized for wide bandwidth low power applications. They have an extremely high gain-bandwidth to power ratio and are unity gain stable. When the load capacitance increases, the increased capacitance at the output pushed the non-dominant pole to lower frequency in the open loop frequency response, worsening the phase and gain margin. They are designed to directly drive up to 100nF capacitive load in unity gain configuration (see Typical Performance Characteristics, Capacitive Load Handling). Higher gain configurations tend to have better capacitive drive capability than lower gain configurations due to lower closed loop bandwidth and hence higher phase margin. Low Input Offset Voltage The LTC6255 family has a low offset voltage of 350μV maximum which is essential for precision applications. The offset voltage is trimmed with a proprietary trim algorithm to ensure low offset voltage over the entire common mode voltage range. Low Input Bias Current The LTC6255 family uses a bias current cancellation circuit to compensate for the base current of the input transistors. When the input common mode voltage is within 200mV of either rail, the bias cancellation circuit are no longer active. For common mode voltages ranging from 0.2V above 625567f 13 LTC6255/LTC6256/LTC6257 Applications Information the negative supply to 0.2V below the positive supply, the low input bias current allows the amplifiers to be used in applications with high resistance sources. Ground Sensing and Rail to Rail Output The LTC6255 family has excellent output drive capability, delivering over 10mA of output drive current. The output stage is a rail-to-rail topology that is capable of swinging to within 30mV of either rail. If output swing to the negative rail is required, an external pull down resistor to a negative supply can be added. For 5V/0V op amp supplies, a pull down resistor of 2.1k to –2V will allow a ‘true zero’ output swing. In this case, the output can swing all the way to the bottom rail while maintaining 80dB of open loop gain. Since the inputs can go 100mV beyond either rail, the op amp can easily perform ‘true ground’ sensing. The maximum output current is a function of total supply voltage. As the supply voltage to the amplifier increases, the output current capability also increases. Attention must be paid to keep the junction temperature of the IC below 150°C when the output is in continuous short-circuit. The output of the amplifier has reverse-biased diodes connected to each supply. The output should not be forced more than 0.5V beyond either supply, otherwise current will flow through these diodes. Input Protection and Output Overdrive To prevent breakdown of the input transistors, the input stages are protected against a large differential input voltage by two pairs of back-to-back diodes, D5 to D8. If the differential input voltage exceeds 1.4V, the current in these diodes must be limited to less than 10mA. These amplifiers are not intended for open loop applications such as comparators. When the output stage is overdriven, internal limiting circuitry is activated to improve overdrive recovery. In some applications, this circuitry may draw as much as 1mA supply current. ESD Supply Voltage Ramping Fast ramping of the supply voltage can cause a current glitch in the internal ESD protection circuits. Depending on the supply inductance, this could result in a supply voltage transient that exceeds the maximum rating. A supply voltage ramp time of greater than 1ms is recommended. Feedback Components Care must be taken to ensure that the pole formed by the feedback resistors and the parasitic capacitance at the inverting input does not degrade stability. For example, in a gain of +2 configuration with gain and feedback resistors of 10k, a poorly designed circuit board layout with parasitic capacitance of 5pF (part +PC board) at the amplifier’s inverting input will cause the amplifier to oscillate due to a pole formed at 3.2MHz. An additional capacitor of 5pF across the feedback resistor as shown in Figure 2 will eliminate any ringing or oscillation. Shutdown The single and dual versions have SHDN pins that can shut down the amplifier to less than 7µA supply current. The SHDN pin voltage needs to be within 0.6V of V– for the amplifier to shut down. During shutdown, the output will be in high output resistance state, which is suitable for multiplexer applications. When left floating, the SHDN pin is internally pulled up to the positive supply and the amplifier remains enabled. 5pF 10k – 10k LTC6255 CPAR + VIN VOUT 625567 F02 Figure 2. The LTC6255 family has reverse-biased ESD protection diodes on all inputs and output as shown in Figure 1. 625567f 14 LTC6255/LTC6256/LTC6257 Typical Applications Frequency Response of 40dB Gain Amplifier 200kHz 130µA Gain-of-100 Amplifier 50 40 0.9V 30 + 20 1/2 LTC6256 + – 1/2 LTC6256 GAIN (dB) VIN VOUT – –0.9V 10 0 –10 –20 90.9k 10k 90.9k 10k –30 –40 625567 F03a –50 10 100 1k 10k 100k FREQUENCY (Hz) 1M 10M 625567 F03b Figure 3. Gain of 100 Amplifier (3dB Bandwidth of 200kHz on 130µA Supply Current) LTC6255 Very Low Power 2nd Order Lowpass Filter Figure 5 with the equations to calculate the RC components for cutoff frequencies up to 100kHz for a Butterworth or a Bessel approximation (a Bessel lowpass filter has very low transient response overshoot). In addition the equations for a 4th order lowpass filter are provided to calculate the RC components for two cascaded 2nd order sections. The LTC6256 circuit shown in Figure 4 is a 2nd order, 100kHz, Butterworth lowpass filter. The filter’s differential output maximizes the dynamic range in very low voltage operation. A general 2nd order lowpass circuit is shown in A, 1.8V, 140µA, 100kHz, Lowpass Filter (Single-Ended Input and Differential Output) Frequency Response 6 – 2.49k VIN 2.49k 2 1000pF 3 100k 100k – + 2.49k 8 1/2 LTC6256 0 2.49k 100pF 10k 1.8V VOUT 0.1µF 1 6 5 – 1/2 LTC6256 + –6 7 VOUT+ 4 GAIN (dB) 1.8V –12 –18 –24 –30 –36 10µF 625567 F04a –42 10k 100k FREQUENCY (Hz) 1M 625567 F04b Figure 4 625567f 15 LTC6255/LTC6256/LTC6257 Typical Applications Table 1. V+ 0.1µF R2 R1 VIN R3 4 C1 10µF 3 100k V+ + 5 2 625567 F05 1 4 π 2 R2 C1 C2 fO2 R2 R1 R2 Gain C1 > 4 Q 2 (Gain + 1) C2 Maximum f–3dB = 100kHz and Maximum Gain = SHDN 100k C2 1− 1− 4 Q 2 [Gain + 1] C1 R2 = 4 π Q fO C2 R1= 1 LTC6255 RC Component Equations Gain = 2nd Order Lowpass 6 – Figure 5 R3 = fO AND Q VALUES C2 100kHz f–3dB VOUT Butterworth fO = f–3dB Q = 0.707 Bessel fO = 1.274 • f–3dB Q = 0.577 Butterworth fO = f–3dB fO = f–3dB Q = 0.541 Q = 1.307 Bessel fO = 1.419 • f–3dB fO = 1.591 • f–3dB Q = 0.522 Q = 0.806 4th Order Lowpass 2µs Rise Time Analog 1A Pulsed LED Current Driver Figure 6 shows the LTC6255 applied as a fast, efficient analog LED current driver. High power LEDs are used in applications ranging from brake lights to video projectors. Most LED applications pulse the LEDs for the best efficiency, and many applications take advantage of control of both pulse width and analog current amplitude. In order to extend the circuit’s input range to accommodate 5V output DACs, the input voltage is initially divided by 50 through the R1:R2 divider. The reduced step is applied to the LTC6255 non inverting input, and LTC6255 output rises until MOSFETs Q1 through Q3 begin to turn on, increasing the current in their drains and therefore the LED. The amount of current is sensed on R3, and fed back to the LTC6255 inverting input through R5. The loop is compensated by R5 and C1, with R4 distancing the gate capacitance from the op amp output for the best time domain response. 10% to 90% rise time was measured at 2µs on a 10mA to 1A pulse. Starting at 0 current there is an additional delay of 2.7µs. It may seem strange to use a micropower op amp in a high current LED application, but it can be justified by the low duty cycles encountered in LED drive applications. A one 625567f 16 LTC6255/LTC6256/LTC6257 Typical Applications amp LED is quite bright even when driven at 1% or even 0.1% duty cycles and these constitute 10mA and 1mA average current levels respectively, in which case the supply current of the op amp becomes noticeable. The LTC6255 combines 6.5MHz of gain-bandwidth product and 1.8V/μs slew rate on a supply current budget of only 65µA. When VIN is at 0V, the op amp supply current is nominally 65µA, but the 450µV maximum input offset may appear across R3 inducing a 4.5mA current in the LED. Some applications want a guaranteed zero LED current at VIN = 0, and 2µs Rise Time Analog 1A Pulsed LED Current Driver VIN R1 9.76k R2 200Ω 5V RUP 1M** 5V + – 5V ILED = VIN • 200mA/V SHDN LTC6255 C1 220pF R4 51Ω Q1 Q2 RSD 100k* R5 240Ω *RSD GUARANTEES LED OFF WHEN OP AMP SHDN. OTHERWISE OPTIONAL. *RUP FORCES LED COMPLETELY OFF WHEN VIN = 0. OTHERWISE OPTIONAL. STANDBY SUPPLY CURRENT WITH VIN = 0: 65µA RUP OPEN 650µA RUP INSTALLED 10% TO 90% RISE TIME: 10mA TO 1A, 2µs 0mA TO 1A, ADD 2.7µs DELAY VIN LED OSRAM LRW5SM ILED this is the purpose of RUP. RUP forces 5µA reverse current through R5 creating a negative 1.2mV output offset at R3. This guarantees a zero LED current, but note that the op amp supply current rises from 65µA to a still respectable 650µA in this case due to internal protection circuitry for the output stage. For reduced current, the LTC6255 can be shut down, but the output becomes high impedance and may leak high which will turn on the MOSFETs and LED hard. Adding pull-down resistor RSD ensures that the LTC6255 output goes low when shutting down. 10mA TO 1A Q3 Q1 TO Q3 MOSFETs 3s 2N7000 0mA TO 1A (EXTRA DELAY) 625567 F07 R3 0.1Ω 100mW 625567 F06 Figure 7: Time Domain Response Showing 2µs Rise Time. Top Waveform Is VIN. Middle Waveform Is the 10mA to 1A Step Measured at R3, then the 0mA to 1A Step Showing Extra 2.7µs Delay When Recovering From 0mA Figure 6: LTC6255 Applied as a LED Current Driver with 2µs Rise Time 625567f 17 LTC6255/LTC6256/LTC6257 Package Description KC Package 8-Lead Plastic UTDFN (2mm × 2mm) (Reference LTC DWG # 05-08-1749 Rev Ø) 1.37 ±0.05 R = 0.115 TYP 5 R = 0.05 TYP 2.00 ±0.10 0.70 ±0.05 2.55 ±0.05 0.64 ±0.05 1.15 ±0.05 2.00 ±0.10 PACKAGE OUTLINE 1.37 ± 0.10 8 0.40 ± 0.10 PIN 1 NOTCH R = 0.20 OR 0.25 s 45° CHAMFER 0.64 ± 0.10 PIN 1 BAR TOP MARK (SEE NOTE 6) 0.25 ± 0.05 0.45 BSC 1.35 REF RECOMMENDED SOLDER PAD PITCH AND DIMENSIONS APPLY SOLDER MASK TO AREAS THAT ARE NOT SOLDERED (KC8) UTDFN 0107 REVØ 4 0.125 REF 0.55 ±0.05 0.00 – 0.05 1 0.23 ± 0.05 0.45 BSC 1.35 REF BOTTOM VIEW—EXPOSED PAD NOTE: 1. DRAWING IS NOT A JEDEC PACKAGE OUTLINE 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 625567f 18 LTC6255/LTC6256/LTC6257 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 625567f 19 LTC6255/LTC6256/LTC6257 Package Description TS8 Package 8-Lead Plastic TSOT-23 (Reference LTC DWG # 05-08-1637) 0.52 MAX 2.90 BSC (NOTE 4) 0.65 REF 1.22 REF 1.4 MIN 3.85 MAX 2.62 REF 2.80 BSC 1.50 – 1.75 (NOTE 4) PIN ONE ID RECOMMENDED SOLDER PAD LAYOUT PER IPC CALCULATOR 0.22 – 0.36 8 PLCS (NOTE 3) 0.65 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 1.95 BSC TS8 TSOT-23 0802 625567f 20 LTC6255/LTC6256/LTC6257 Package Description MS8 Package 8-Lead Plastic MSOP (Reference LTC DWG # 05-08-1660 Rev F) 3.00 p 0.102 (.118 p .004) (NOTE 3) 0.889 p 0.127 (.035 p .005) 5.23 (.206) MIN 3.20 – 3.45 (.126 – .136) 0.254 (.010) 8 7 6 5 3.00 p 0.102 (.118 p .004) (NOTE 4) 4.90 p 0.152 (.193 p .006) DETAIL “A” 0.52 (.0205) REF 0o – 6o TYP GAUGE PLANE 0.42 p 0.038 (.0165 p .0015) TYP 0.65 (.0256) BSC 0.53 p 0.152 (.021 p .006) DETAIL “A” RECOMMENDED SOLDER PAD LAYOUT 1 1.10 (.043) MAX 2 3 4 0.86 (.034) REF 0.18 (.007) SEATING PLANE 0.22 – 0.38 (.009 – .015) TYP 0.65 (.0256) BSC 0.1016 p 0.0508 (.004 p .002) MSOP (MS8) 0307 REV F NOTE: 1. DIMENSIONS IN MILLIMETER/(INCH) 2. DRAWING NOT TO SCALE 3. DIMENSION DOES NOT INCLUDE MOLD FLASH, PROTRUSIONS OR GATE BURRS. MOLD FLASH, PROTRUSIONS OR GATE BURRS SHALL NOT EXCEED 0.152mm (.006") PER SIDE 4. DIMENSION DOES NOT INCLUDE INTERLEAD FLASH OR PROTRUSIONS. INTERLEAD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.152mm (.006") PER SIDE 5. LEAD COPLANARITY (BOTTOM OF LEADS AFTER FORMING) SHALL BE 0.102mm (.004") MAX 625567f 21 LTC6255/LTC6256/LTC6257 Package Description MS Package 10-Lead Plastic MSOP (Reference LTC DWG # 05-08-1661 Rev E) 0.889 ± 0.127 (.035 ± .005) 5.23 (.206) MIN 3.20 – 3.45 (.126 – .136) 3.00 ± 0.102 (.118 ± .004) (NOTE 3) 0.50 0.305 ± 0.038 (.0197) (.0120 ± .0015) BSC TYP RECOMMENDED SOLDER PAD LAYOUT 0.254 (.010) 10 9 8 7 6 3.00 ± 0.102 (.118 ± .004) (NOTE 4) 4.90 ± 0.152 (.193 ± .006) DETAIL “A” 0.497 ± 0.076 (.0196 ± .003) REF 0° – 6° TYP GAUGE PLANE 1 2 3 4 5 0.53 ± 0.152 (.021 ± .006) DETAIL “A” 0.18 (.007) SEATING PLANE 1.10 (.043) MAX 0.17 – 0.27 (.007 – .011) TYP 0.50 (.0197) NOTE: BSC 1. DIMENSIONS IN MILLIMETER/(INCH) 2. DRAWING NOT TO SCALE 3. DIMENSION DOES NOT INCLUDE MOLD FLASH, PROTRUSIONS OR GATE BURRS. MOLD FLASH, PROTRUSIONS OR GATE BURRS SHALL NOT EXCEED 0.152mm (.006") PER SIDE 4. DIMENSION DOES NOT INCLUDE INTERLEAD FLASH OR PROTRUSIONS. INTERLEAD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.152mm (.006") PER SIDE 5. LEAD COPLANARITY (BOTTOM OF LEADS AFTER FORMING) SHALL BE 0.102mm (.004") MAX 0.86 (.034) REF 0.1016 ± 0.0508 (.004 ± .002) MSOP (MS) 0307 REV E 625567f 22 LTC6255/LTC6256/LTC6257 Package Description MS Package 16-Lead Plastic MSOP (Reference LTC DWG # 05-08-1669 Rev Ø) 0.889 p 0.127 (.035 p .005) 5.23 (.206) MIN 3.20 – 3.45 (.126 – .136) 4.039 p 0.102 (.159 p .004) (NOTE 3) 0.50 (.0197) BSC 0.305 p 0.038 (.0120 p .0015) TYP RECOMMENDED SOLDER PAD LAYOUT 0.254 (.010) DETAIL “A” 3.00 p 0.102 (.118 p .004) (NOTE 4) 4.90 p 0.152 (.193 p .006) 0o – 6o TYP 0.280 p 0.076 (.011 p .003) REF 16151413121110 9 GAUGE PLANE 0.53 p 0.152 (.021 p .006) DETAIL “A” 0.18 (.007) SEATING PLANE 1.10 (.043) MAX 0.17 – 0.27 (.007 – .011) TYP 1234567 8 0.50 (.0197) BSC NOTE: 1. DIMENSIONS IN MILLIMETER/(INCH) 2. DRAWING NOT TO SCALE 3. DIMENSION DOES NOT INCLUDE MOLD FLASH, PROTRUSIONS OR GATE BURRS. MOLD FLASH, PROTRUSIONS OR GATE BURRS SHALL NOT EXCEED 0.152mm (.006") PER SIDE 4. DIMENSION DOES NOT INCLUDE INTERLEAD FLASH OR PROTRUSIONS. INTERLEAD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.152mm (.006") PER SIDE 5. LEAD COPLANARITY (BOTTOM OF LEADS AFTER FORMING) SHALL BE 0.102mm (.004") MAX 0.86 (.034) REF 0.1016 p 0.0508 (.004 p .002) MSOP (MS16) 1107 REV Ø 625567f 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. 23 LTC6255/LTC6256/LTC6257 Typical Application 2µs Rise Time Analog 1A Pulsed LED Current Driver. LTC6255 Applied as a LED Current Driver with 2µs Rise Time VIN R1 9.76k + R2 200Ω 5V – RUP 1M** 5V ILED = VIN • 200mA/V 5V SHDN LTC6255 C1 220pF LED OSRAM LRW5SM ILED R4 51Ω Q1 Q2 RSD 100k* R5 240Ω *RSD GUARANTEES LED OFF WHEN OP AMP SHDN. OTHERWISE OPTIONAL. *RUP FORCES LED COMPLETELY OFF WHEN VIN = 0. OTHERWISE OPTIONAL. STANDBY SUPPLY CURRENT WITH VIN = 0: 65µA RUP OPEN 650µA RUP INSTALLED 10% TO 90% RISE TIME: 10mA TO 1A, 2µs 0mA TO 1A, ADD 2.7µs DELAY Time Domain Response Showing 2µs Rise Time. Top Waveform Is VIN. Middle Waveform Is the 10mA to 1A Step Measured at R3, then the 0mA to 1A Step Showing Extra 2.7µs Delay When Recovering From 0mA VIN Q3 Q1 TO Q3 MOSFETs 3s 2N7000 10mA TO 1A R3 0.1Ω 100mW 0mA TO 1A (EXTRA DELAY) 625567 TA02b 625567 TA02a Related Parts PART NUMBER DESCRIPTION COMMENTS LTC6246/LTC6247/ 180MHz, 1µA, Power Efficient Rail-to-Rail Op Amps LTC6248 180MHz GBW, 1mA, 500μV VOS, RR In/Out, 2.5V to 5.25V, 90V/µs Slew Rate LT1498/LT1499 10MHz, 6V/µs, Dual/Quad,Rail-to-Rail Input and Output, Precision C-Load Op Amps 10MHz GBW, 1.7mA, 475μV VOS, RR In/Out, 2.2V to ±15V, 10nF CLOAD LTC6081/LT6082 Precision Dual/Quad CMOS Rail-to-Rail Input/Output Amplifiers 3.6MHz GBW, 330μA, 70μV VOS, RR In/Out, 2.7V to 5.5V, 100dB CMRR LTC2050/LTC2051/ Zero-Drift Operational Amplifiers in SOT-23 LTC2052 3MHz GBW, 800μA, 3μV VOS, V– to V+ – 1V In, RR Out, 2.7V to 6V, 130dB CMRR/PSRR LTC1050/LTC1051/ Precision Zero-Drift, Operational Amplifierwith Internal LTC1052 Capacitors 2.5MHz GBW, 1mA, 5μV VOS, V– to V+ – 2.3V In, RR Out, 4.75V to 16V, 120dB CMRR, 125dB PSRR LTC6084/LTC6085 Dual/Quad 1.5MHz, Rail-to-Rail, CMOS Amplifiers 1.5MHz GBW, 110μA, 750μV VOS, RR In/Out, 2.5V to 5.5V LT1783 1.25MHz, Over-The-Top Micropower, Rail-to-Rail Input and Output Op Amp in SOT-23 1.25MHz GBW, 300μA, 800μV VOS, RR In/Out, 2.5V to 18V LT1637/LT1638/ LT1639 1.1MHz, 0.4V/μs Over-The-Top Micropower, Rail-to-Rail Input and Output Op Amps 1.1MHz GBW, 250μA, 350μV VOS, RR In/Out, 2.7V to 44V, 110dB CMRR LT2054/LT2055 Single/Dual Micropower Zero-Drift Operational Amplifiers 500kHz GBW, 150μA, 3μV VOS, V– to V+ – 0.5V In, RR Out, 2.7V to 6V LT6010/LT6011/ LT6012 135μA, 14nV/√Hz, Rail-to-Rail Output Precision Op Amp with Shutdown 330kHz GBW, 135μA, 35μV VOS, V– + 1.0V to V+ – 1.2V In, RR Out, 2.7V to 36V LT1782 Micropower, Over-The-Top, SOT-23, Rail-to-Rail Input and 200kHz GBW, 55μA, 800μV VOS, RR In/Out, 2.5V to 18V Output Op Amp LT1636 Over-The-Top, Micropower Rail-to-Rail, Input and Output Op Amp 200kHz GBW, 50μA, 225μV VOS, RR In/Out, 2.7V to 44V, –40°C to 125°C LT1490A/LT1491A Dual/Quad Over-The-Top, Micropower Rail-to-Rail Input and Output Op Amps 200kHz GBW, 50μA, 500μV VOS, RR In/Out, 2V to 44V LT2178/LT2179 17μA Max, Dual and Quad, Single Supply, Precision Op Amps 85kHz GBW, 17μA, 70μV VOS, RR In/Out, 5V to 44V LT6000/LT6001/ LT6002 Single, Dual and Quad, 1.8V, 13μA Precision Rail-to-Rail Op Amps 50kHz GBW, 16μA , 600μV VOS(MAX), RR In/Out, 1.8V to 18V ® 625567f 24 Linear Technology Corporation 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 ● FAX: (408) 434-0507 ● www.linear.com LT 0610 • PRINTED IN USA LINEAR TECHNOLOGY CORPORATION 2010