LT1782 Micropower, Over-The-Top SOT-23, Rail-to-Rail Input and Output Op Amp U DESCRIPTIO FEATURES ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ Operates with Inputs Above V + Rail-to-Rail Input and Output Micropower: 55µA Supply Current Max Small SOT-23 Package Low Input Offset Voltage: 800µV Max Single Supply Input Range: 0V to 18V High Output Current: 18mA Min Specified on 3V, 5V and ±5V Supplies Output Shutdown on 6-Lead Version Reverse Battery Protection to 18V High Voltage Gain: 1500V/mV Gain Bandwidth Product: 200kHz Slew Rate: 0.07V/µs Operating Temperature Range: –40°C to 85°C U APPLICATIO S ■ ■ ■ ■ ■ ■ The input range of the LT1782 includes ground, and a unique feature of this device is its Over-The-TopTM operation capability with either or both of its inputs above the positive rail. The inputs handle 18V both differential and common mode, independent of supply voltage. The input stage incorporates phase reversal protection to prevent false outputs from occurring even when the inputs are 9V below the negative supply. The LT1782 can drive loads up to 18mA and still maintain rail-to-rail capability. A shutdown feature on the 6-lead version can disable the part, making the output high impedance and reducing quiescent current to 5µA. The LT1782 op amp is available in the 5- and 6-lead SOT-23 packages. For applications requiring higher speed, refer to the LT1783. Portable Instrumentation Battery- or Solar-Powered Systems Sensor Conditioning Supply Current Sensing Battery Monitoring MUX Amplifiers 4mA to 20mA Transmitters , LTC and LT are registered trademarks of Linear Technology Corporation. Over-The-Top is a trademark of Linear Technology Corporation. U ■ The LT®1782 is a 200kHz op amp available in the small SOT-23 package that operates on all single and split supplies with a total voltage of 2.5V to 18V. The amplifier draws less than 55µA of quiescent current and has reverse battery protection, drawing negligible current for reverse supply voltages up to 18V. TYPICAL APPLICATIO Distribution of Input Offset Voltage Positive Supply Rail Current Sense 200Ω 5V 0.2Ω 200Ω LOAD ILOAD + LT1782 2N3904 – VOUT = 2Ω(ILOAD) 0V TO 4.3V PERCENTAGE OF AMPLIFIERS V+ 5V TO 18V 25 20 VS = 5V, 0V VCM = 2.5V 15 10 5 2k 1782 TA01 0 –900 –600 –300 0 300 600 INPUT OFFSET VOLTAGE (µV) 900 1782 TA01a 1 LT1782 W W U W ABSOLUTE MAXIMUM RATINGS (Note 1) Total Supply Voltage (V + to V –) .............................. 18V Input Differential Voltage ........................................ 18V Input Pin Voltage to V – ............................... + 24V/–10V Shutdown Pin Voltage Above V – ............................ 18V Shutdown Pin Current ....................................... ±10mA Output Short-Circuit Duration (Note 2) ........... Indefinite Operating Temperature Range (Note 10) – 40°C to 85°C Specified Temperature Range ...................... 0°C to 70°C Junction Temperature........................................... 150°C Storage Temperature Range ................ – 65°C to 150°C Lead Temperature (Soldering, 10 sec)................. 300°C U W U PACKAGE/ORDER INFORMATION TOP VIEW 5 V OUT 1 V– 2 + OUT 1 LT1782CS5 +IN 3 + – +IN 3 4 –IN S5 PACKAGE 5-LEAD PLASTIC SOT-23 TOP VIEW ORDER PART NUMBER V– 2 S5 PART MARKING LTLD TJMAX = 150°C, θJA = 250°C/ W ORDER PART NUMBER + 6 V 5 SHDN + – LT1782CS6 4 –IN S6 PART MARKING S6 PACKAGE 6-LEAD PLASTIC SOT-23 LTIS TJMAX = 150°C, θJA = 230°C/ W Consult factory for Industrial and Military grade parts. ELECTRICAL CHARACTERISTICS The ● denotes specifications which apply over the specified temperature range, otherwise specifications are TA = 25°C. VS = 3V, 0V; VS = 5V, 0V, VCM = VOUT = half supply, for the 6-lead part VPIN5 = 0V, pulse power tested unless otherwise specified. SYMBOL PARAMETER CONDITIONS VOS TA = 25°C 0°C ≤ TA ≤ 70°C ● 0°C ≤ TA ≤ 70°C VCM = 18V (Note 3) Input Offset Voltage Input Offset Voltage Drift (Note 7) IOS IB Input Offset Current Input Bias Current VCM = 18V (Note 3) SHDN or VS = 0V, VCM = 0V to 18V MIN TYP MAX UNITS 400 800 950 µV µV ● 2 5 µV/°C ● ● 0.7 2 1 nA µA ● ● 8 6 0.1 15 12 nA µA nA ● Input Bias Current Drift 0°C ≤ TA ≤ 70°C 0.01 nA/°C Input Noise Voltage 0.1Hz to 10Hz 1 µVP-P en Input Noise Voltage Density f = 1kHz 50 nV/√Hz in Input Noise Current Density f = 1kHz 0.05 pA/√Hz RIN Input Resistance Differential Common Mode, VCM = 0V to (VCC – 1V) Common Mode, VCM = 0V to 18V 6.5 5 3 MΩ GΩ MΩ CIN 3.4 1.5 Input Capacitance 5 Input Voltage Range ● 0 pF 18 V CMRR Common Mode Rejection Ratio (Note 3) VCM = 0V to VCC – 1V VCM = 0V to 18V (Note 6) ● ● 90 68 100 80 dB dB PSRR Power Supply Rejection Ratio VS = 3V to 12.5V, VCM = VO = 1V ● 90 100 dB AVOL Large-Signal Voltage Gain VS = 3V, VO = 500mV to 2.5V, RL = 10k VS = 3V, 0°C ≤ TA ≤ 70°C 200 133 1500 ● V/mV V/mV VS = 5V, VO = 500mV to 4.5V, RL = 10k VS = 5V, 0°C ≤ TA ≤ 70°C 400 250 1500 ● V/mV V/mV 2 LT1782 ELECTRICAL CHARACTERISTICS The ● denotes specifications which apply over the specified temperature range, otherwise specifications are TA = 25°C. VS = 3V, 0V; VS = 5V, 0V, VCM = VOUT = half supply, for the 6-lead part VPIN5 = 0V, pulse power tested unless otherwise specified. SYMBOL PARAMETER CONDITIONS VOL Output Voltage Swing LOW No Load ISINK = 5mA VS = 5V, ISINK = 10mA ● ● ● VOH Output Voltage Swing HIGH VS = 3V, No Load VS = 3V, ISOURCE = 5mA ● ● 2.91 2.6 2.94 2.8 V V VS = 5V, No Load VS = 5V, ISOURCE = 10mA ● ● 4.91 4.5 4.94 4.74 V V VS = 3V, Short to GND VS = 3V, Short to VCC 5 15 10 30 mA mA VS = 5V, Short to GND VS = 5V, Short to VCC 15 20 30 40 mA mA ISC Short-Circuit Current (Note 2) Minimum Supply Voltage Reverse Supply Voltage IS MIN Supply Current (Note 4) ● MAX UNITS 3 200 400 8 500 800 mV mV mV 2.5 ● IS = –100µA TYP 2.7 18 V V 40 55 60 µA µA ● Supply Current, SHDN VPIN5 = 2V, No Load (Note 8) ● 5 15 µA Shutdown Pin Current VPIN5 = 0.3V, No load (Note 8) VPIN5 = 2V, No Load (Note 8) VPIN5 = 5V, No Load (Note 8) ● ● ● 0.5 2 5 8 nA µA µA Shutdown Output Leakage Current VPIN5 = 2V, No Load (Note 8) ● 0.05 1 µA Maximum Shutdown Pin Current VPIN5 = 18V, No Load (Note 8) ● 10 30 µA VL Shutdown Pin Input Low Voltage (Note 8) ● 0.3 V VH Shutdown Pin Input High Voltage (Note 8) ● tON Turn-On Time VPIN5 = 5V to 0V, RL = 10k (Note 8) 100 µs tOFF Turn-Off Time VPIN5 = 0V to 5V, RL = 10k (Note 8) 6 µs GBW Gain Bandwidth Product (Note 3) f = 5kHz 0°C ≤ TA ≤ 70°C 110 100 200 ● kHz kHz Slew Rate (Note 5) AV = –1, RL = ∞ 0°C ≤ TA ≤ 70°C 0.035 0.031 0.07 ● V/µs V/µs ISHDN SR tS Settling Time VS = 5V, ∆VOUT = 2V to 0.1%, AV = –1 THD Distortion VS = 3V, VO = 2VP–P, AV = 1, RL = 10k, f =1kHz FPBW Full-Power Bandwidth (Note 9) VOUT = 2VP–P 2 V 45 µs 0.003 % 11 kHz VS = ±5V, VCM = 0V,VOUT = 0V, for the 6-lead part VSHDN = V – VOS Input Offset Voltage TA = 25°C 0°C ≤ TA ≤ 70°C ● 0°C ≤ TA ≤ 70°C 500 900 1050 µV µV ● 2 5 µV/°C IOS Input Offset Current ● 0.7 2 nA IB Input Bias Current ● 8 15 nA ● Input Offset Voltage Drift (Note 7) Input Bias Current Drift 0°C ≤ TA ≤ 70°C 0.01 nA/°C Input Noise Voltage 0.1Hz to 10Hz 1 µVP-P en Input Noise Voltage Density f = 1kHz 50 nV/√Hz in Input Noise Current Density f = 1kHz 0.05 pA/√Hz 3 LT1782 ELECTRICAL CHARACTERISTICS The ● denotes specifications which apply over the specified temperature range, otherwise specifications are TA = 25°C. VS = ±5V, VCM = 0V,VOUT = 0V, for the 6-lead part VSHDN = V–, unless otherwise specified. SYMBOL PARAMETER CONDITIONS RIN Input Resistance Differential Common Mode, VCM = –5V to 13V CIN Input Capacitance MIN TYP ● ● 3.4 1.5 6.5 3 ● –5 MAX MΩ MΩ 5 Input Voltage Range UNITS pF 13 V CMRR Common Mode Rejection Ratio VCM = –5V to 13V ● 68 80 dB AVOL Large-Signal Voltage Gain VO = ±4V, RL= 10k 0°C ≤ TA ≤ 70°C 55 40 150 ● V/mV V/mV VOL Output Voltage Swing LOW No Load ISINK = 5mA ISINK = 10mA ● ● ● VOH Output Voltage Swing HIGH No Load ISOURCE = 5mA ISOURCE = 10mA ● ● ● 4.91 4.6 4.5 4.94 4.8 4.74 ISC Short-Circuit Current (Note 2) Short to GND 0°C ≤ TA ≤ 70°C 18 15 30 ● VS = ±1.5V to ±9V ● 90 100 PSRR Power Supply Rejection Ratio IS Supply Current –4.997 –4.8 –4.6 V V V V V V mA mA dB 45 60 65 µA µA ● ISHDN –4.992 –4.5 –4.2 Supply Current, SHDN VPIN5 = –3V, VS = ±5V, No Load (Note 8) ● 6 20 µA Shutdown Pin Current VPIN5 = –4.7V, VS = ±5V, No load (Note 8) VPIN5 = –3V, VS = ±5V, No Load (Note 8) ● ● 0.5 2 8 nA µA VPIN5 = 9V, VS = ±9V (Note 8) ● 10 30 µA 0.05 1 µA –4.7 V Maximum Shutdown Pin Current Shutdown Output Leakage Current VPIN5 = –7V, VS = ±9V, No Load (Note 8) ● VL Shutdown Pin Input Low Voltage VS = ±5V (Note 8) ● VH Shutdown Pin Input High Voltage VS = ±5V (Note 8) ● tON Turn-On Time VPIN5 = 0V to –5V, RL = 10k (Note 8) ● 100 µs tOFF Turn-Off Time VPIN5 = –5V to 0V, RL = 10k (Note 8) ● 6 µs GBW Gain Bandwidth Product f = 5kHz 0°C ≤ TA ≤ 70°C 120 110 225 ● kHz kHz AV = –1, RL = ∞, VO = ±4V, Measured at VO = ±2V 0°C ≤ TA ≤ 70°C 0.0375 0.033 0.075 ● V/µs V/µs SR Slew Rate –3 V tS Settling Time ∆VOUT = 4V to 0.1%, AV = 1 50 µs FPBW Full-Power Bandwidth (Note 9) VOUT = 8VP–P 3 kHz Note 1: Absolute Maximum Ratings are those values beyond which the life of a device may be impaired. Note 2: A heat sink may be required to keep the junction temperature below absolute maximum. Note 3: VS = 5V limits are guaranteed by correlation to VS = 3V and VS = ±5V or VS = ±9V tests. Note 4: VS = 3V limits are guaranteed by correlation to VS = 5V and VS = ±5V or VS = ±9V tests. Note 5: Guaranteed by correlation to slew rate at VS = ±5V, and GBW at VS = 3V and VS = ±5V tests. 4 Note 6: This specification implies a typical input offset voltage of 1.8mV at VCM = 18V and a maximum input offset voltage of 7.2mV at VCM = 18V. Note 7: This parameter is not 100% tested. Note 8: Specifications apply to 6-lead SOT-23 with shutdown. Note 9: Full-power bandwidth is calculated for the slew rate. FPBW = SR/2πVP. Note 10: The LT1782 is guaranteed functional over the operating temperature range – 40°C to 85°C. LT1782 U W TYPICAL PERFOR A CE CHARACTERISTICS 50 400 INPUT OFFSET VOLTAGE CHANGE (µV) 40 TA = 25°C 35 TA = –55°C 30 25 4 6 8 10 12 14 SUPPLY VOLTAGE (V) 16 4 200 100 0 TA = 125°C TA = –55°C –100 –400 18 0 1 2 3 4 TOTAL SUPPLY VOLTAGE (V) 1782 G02a Output Saturation Voltage vs Load Current (Output Low) 1 1 VS = 5V, 0V 2000 TA = 25°C 1000 40 30 VS = ±2.5V VOD = 30mV OUTPUT SATURATION VOLTAGE (V) 3000 TA = –55°C 20 10 0 –10 15 16 18 3.8 4 4.2 4.4 4.6 4.8 5 5.2 5.4 COMMON MODE VOLTAGE (V) – 0 –10–8 –6 –4 –2 0 2 4 6 8 10 12 14 16 18 VIN (V) 5 Output Saturation Voltage vs Load Current (Output High) TA = 125°C + 1782 G02 6000 TA = 125°C 0.1 TA = 25°C 0.01 1µ TA = –55°C VS = ±2.5V VOD = 30mV TA = 125°C 0.1 TA = –55°C TA = 25°C 0.01 0.001 10µ 100µ 1m SOURCING LOAD CURRENT (A) 1782 G03 10m 10µ 1µ 1m SINKING LOAD CURRENT (A) 1µ 1782 G05 1782 G04 Output Saturation Voltage vs Input Overdrive 10m Output Short-Circuit Current vs Temperature 0.1Hz to 10Hz Noise Voltage 40 100 VS = ±5V OUTPUT HIGH VS = ±2.5V OUTPUT CURRENT (mA) 35 10 OUTPUT LOW 1 10 20 30 40 50 INPUT OVERDRIVE (mV) SINKING CURRENT 30 SOURCING CURRENT 25 20 VS = ±2.5V NO LOAD 0 NOISE VOLTAGE (400nV/DIV) INPUT BIAS CURRENT (nA) VIN 1 Input Bias Current vs Common Mode Voltage 4000 5V 2 –300 1782 G01 5000 3 TA = 25°C –200 20 2 VS = 5V, 0V 300 OUTPUT SATURATION VOLTAGE (V) SUPPLY CURRENT (µA) 45 5 VOUT (V) TA = 125°C OUTPUT SATURATION VOLTAGE (mV) Output Voltage vs Large Input Voltage Minimum Supply Voltage Supply Current vs Supply Voltage 60 1782 G06 15 –50 –25 0 25 50 75 TEMPERATURE (°C) 100 125 1782 G06a 0 1 2 3 4 5 6 TIME (sec) 7 8 9 10 1782 G07 5 LT1782 U W TYPICAL PERFOR A CE CHARACTERISTICS Noise Voltage Density vs Frequency 70 70 60 50 40 30 1 100 1k FREQUENCY (Hz) 10 10k VS = ±2.5V 0.35 50 0.30 0.25 0.20 0.10 20 GAIN 20 0 10 –20 0 –40 –10 –60 0.05 –20 –80 0 –30 1 10 100 1k FREQUENCY (Hz) –100 1M 10k 100k FREQUENCY (Hz) 1k 10k 1782 G10 Gain Bandwidth Product and Phase Margin vs Supply Voltage Slew Rate vs Temperature VS = ±2.5V 0.10 200 190 180 GAIN BAINDWIDTH PRODUCT (kHz) SLEW RATE (V/µs) 210 0.09 0.08 FALLING 0.07 0.06 0.05 –25 0 25 50 75 TEMPERATURE (°C) 100 0.04 –50 125 –25 0 25 50 75 TEMPERATURE (°C) 100 1782 G11 200 50 GAIN BANDWIDTH PRODUCT 150 100 10k LOAD RESISTANCE (Ω) 100k 1782 G14 AV = –1 RF = RG = 10k f = 5kHz 180 160 0 125 2 4 6 8 10 12 14 16 TOTAL SUPPLY VOLTAGE (V) CMRR vs Frequency 110 VS = ±2.5V 80 70 60 50 POSITIVE SUPPLY 40 30 20 10 18 1782 G13 NEGATIVE SUPPLY 0 –10 50 1k GAIN BANDWIDTH PRODUCT 200 90 POWER SUPPLY REJECTION RATIO (dB) 60 PHASE MARGIN (DEG) 250 220 PSRR vs Frequency 70 VS = ±2.5V AV = –1 RF = RG = 10k f = 5kHz 50 1782 G12 Gain Bandwidth Product and Phase Margin vs Load Resistance PHASE MARGIN 240 COMMON MODE REJECTION RATIO (dB) 170 –50 55 PHASE MARGIN RISING PHASE MARGIN (DEG) 60 0.11 f = 5kHz VS = ±2.5V 220 GAIN BANDWIDTH (kHz) 30 0.15 Gain Bandwidth Product vs Temperature GAIN BANDWIDTH PRODUCT (kHz) 60 40 1782 G09 230 80 PHASE 40 1782 G08 6 100 VS = ±2.5V 60 GAIN (dB) INPUT NOISE CURRENT DENSITY (pA/√Hz) 0.40 PHASE SHIFT (DEG) INPUT NOISE VOLTAGE DENSITY (nV/√Hz) 80 20 Gain and Phase Shift vs Frequency Input Noise Current vs Frequency VS = ±2.5V 100 90 80 70 60 50 40 30 1k 10k 100k FREQUENCY (Hz) 1M 1782 G15 1k 10k FREQUENCY (Hz) 100k 1782 G16 LT1782 U W TYPICAL PERFOR A CE CHARACTERISTICS Disabled Output Impedance vs Frequency (Note 8) Output Impedance vs Frequency 1M 10k 4 VS = ±2.5V VPIN5 (SHUTDOWN) = 2.5V VS = ±2.5V AV = 10 100 10 AV = 1 3 100k AV = 1 AV = –1 2 OUTPUT STEP (V) OUTPUT IMPEDANCE (Ω) AV = 100 1k OUTPUT IMPEDANCE (Ω) Settling Time to 0.1% vs Output Step 10k 1k 1 VS = ±5V 0 –1 –2 1 AV = 1 AV = –1 –3 0.1 100 1k 10k 100k FREQUENCY (Hz) 100 100 1M 1k 10k 100k FREQUENCY (Hz) VS = ±5V 10 OUTPUT SWING (VP-P) 30 25 20 AV = 1 AV = 5 10 AV = 10 5 70 80 1 DISTORTION ≤ 1% AV = 1 8 THD + NOISE (%) VS = 5V, 0V VCM = 2.5V 15 35 40 50 60 SETTLING TIME (µs) Total Harmonic Distortion + Noise vs Frequency 12 40 35 30 1782 G18 Undistorted Output Swing vs Frequency Capacitive Load Handling Overshoot vs Capacitive Load 6 4 VS = ±1.5V VS = 3V, 0V VOUT = 2VP-P VCM = 1.2V RL = 10k 0.1 AV = –1 RF = RG = 100k 0.010 2 AV = 1 10 100 1000 CAPACITIVE LOAD (pF) 0.001 0 100 0 10000 1k 10k FREQUENCY (Hz) 10 10 f = 1kHz, RL = 10k VS = 3V TOTAL AV = 1 VIN = 2VP-P AT 1kHz THD + NOISE (%) VS = 3V, 0V VIN = 0.5V TO 2.5V 0.01 0.001 100 AV = 1 VS = ±1.5V VCM = 0V 1 0.1 AV = –1, RF = RG = 100k VS = ±1.5V VCM = 0V 0.1 0.01 VS = 3V, 0V VIN = 0.2V TO 2.2V AV = 1 VS = 3V. 0V VCM = 1.5V 0.001 1k 10k LOAD RESISTANCE TO GROUND (Ω) 100k 1782 G22 1k 100 FREQUENCY (Hz) 10k 1782 G21 Total Harmonic Distortion + Noise vs Output Voltage Amplitude Total Harmonic Distortion + Noise vs Load Resistance VS = ±1.5V VIN = ±1V 10 1782 G20 1782 G19 1 100k 0 AV = –1, RF = RG = 100k VS = 3V, 0V VCM = 1.5V 1 2 OUTPUT VOLTAGE AMPLITUDE (VP-P) Open-Loop Gain INPUT OFFSET VOLTAGE CHANGE (50µV/DIV) OVERSHOOT (%) 25 1782 G17a 1782 G17 THD + NOISE (%) –4 1M 3 1782 G23 VS = ±5V RL = 10k RL = 50k RL = 2k –6 –5 –4 –3 –2 –1 0 1 2 3 OUTPUT VOLTAGE (V) 4 5 6 1782 G24 7 LT1782 U W TYPICAL PERFOR A CE CHARACTERISTICS Supply Current vs Shutdown Voltage Small-Signal Response Large-Signal Response 50 VS = 5V, 0V TA = 125°C SUPPLY CURRENT (µA) 40 TA = 25°C 30 TA = –55°C 20 10 0 0 0.5 1 1.5 2 SHUTDOWN PIN VOLTAGE (V) 2.5 VS = ±5V AV = 1 CL = 15pF 1782 G26 VS = ±5V AV = 1 CL = 15pF 1782 G27 1782 G25 U W U U APPLICATIO S I FOR ATIO Supply Voltage The positive supply pin of the LT1782 should be bypassed with a small capacitor (typically 0.1µF) within an inch of the pin. When driving heavy loads, an additional 4.7µF electrolytic capacitor should be used. When using split supplies, the same is true for the negative supply pin. The LT1782 is protected against reverse battery voltages up to 18V. In the event a reverse battery condition occurs, the supply current is typically less than 1nA. Inputs The LT1782 has two input stages, NPN and PNP (see the Simplified Schematic), resulting in three distinct operating regions as shown in the Input Bias Current vs Common Mode typical performance curve. For input voltages about 0.8V or more below V +, the PNP input stage is active and the input bias current is typically –8nA. When the input common mode voltage is within 0.5V of the positive rail, the NPN stage is operating and the input bias current is typically 15nA. Increases in temperature will cause the voltage at which operation switches from the PNP input stage to the NPN input stage to move towards V +. The input offset voltage of the NPN stage is untrimmed and is typically 1.8mV. 8 A Schottky diode in the collector of the input NPN transistors, along with special geometries for these NPN transistors, allows the LT1782 to operate with either or both of its inputs above V +. At about 0.3V above V +, the NPN input transistor is fully saturated and the input bias current is typically 4µA at room temperature. The input offset voltage is typically 1.8mV when operating above V +. The LT1782 will operate with its inputs 18V above V – regardless of V +. The inputs are protected against excursions as much as 10V below V – by an internal 6k resistor in series with each input and a diode from the input to the negative supply. The input stage of the LT1782 incorporates phase reversal protection to prevent the output from phase reversing for inputs up to 9V below V –. There are no clamping diodes between the inputs and the maximum differential input voltage is 18V. Output The output of the LT1782 can swing to within 60mV of the positive rail with no load and within 3mV of the negative rail with no load. When monitoring voltages within 60mV of the positive rail or within 3mV of the negative rail, gain should be taken to keep the output from clipping. The LT1782 can sink and source over 30mA at ±5V supplies, LT1782 U U W U APPLICATIO S I FOR ATIO sourcing current is reduced to 10mA at 3V total supplies as noted in the Electrical Characteristics. The LT1782 is internally compensated to drive at least 600pF of capacitance under any output loading conditions. A 0.22µF capacitor in series with a 150Ω resistor between the output and ground will compensate these amplifiers for larger capacitive loads, up to 10,000pF, at all output currents. Distortion There are two main contributors to distortion in op amps: output crossover distortion as the output transitions from sourcing to sinking current, and distortion caused by nonlinear common mode rejection. If the op amp is operating inverting, there is no common mode induced distortion. If the op amp is operating in the PNP input stage (input is not within 0.8V of V +), the CMRR is very good, typically 100dB. When the LT1782 switches between input stages, there is significant nonlinearity in the CMRR. Lower load resistance increases the output crossover distortion but has no effect on the input stage transition distortion. For lowest distortion, the LT1782 should be operated single supply, with the output always sourcing current and with the input voltage swing between ground and (V + – 0.8V). See the Typical Performance Characteristics curves, “Total Harmonic Distortion + Noise vs Ouput Voltage Amplitude.” Gain The open-loop gain is almost independent of load when the output is sourcing current. This optimizes performance in single supply applications where the load is returned to ground. The typical performance curve of open-loop gain for various loads shows the details. Shutdown The 6-lead part includes a shutdown feature that disables the part, reducing quiescent current and making the output high impedance. The part can be shut down by bringing the SHDN pin 1.2V or more above V –. When shut down, the supply current is about 5µA and the output leakage current is less than 1µA (V – ≤ VOUT ≤ V +). In normal operation, the SHDN pin can be tied to V – or left floating. See the Typical Performance Characteristics curves, “Supply Current vs Shutdown Pin Voltage.” W W SI PLIFIED SCHE ATIC V+ Q2 Q1 Q3 SHDN R1 30k R2 6k Q4 Q19 – IN Q17 + J1 Q7 R3 6k 2µA Q8 Q11 OUT +IN Q5 Q18 Q15 Q9 Q24 Q20 Q12 Q16 Q26 Q25 Q23 Q22 D3 D1 Q6 D4 D5 Q10 Q13 Q14 R4 40k Q21 R5 40k V– 1782 SS 9 LT1782 U PACKAGE DESCRIPTIO Dimensions in inches (millimeters) unless otherwise noted. S5 Package 5-Lead Plastic SOT-23 (LTC DWG # 05-08-1633) 2.80 – 3.00 (0.110 – 0.118) (NOTE 3) 2.60 – 3.00 (0.102 – 0.118) 1.50 – 1.75 (0.059 – 0.069) 0.35 – 0.55 (0.014 – 0.022) 1.90 (0.074) REF 0.00 – 0.15 (0.00 – 0.006) 0.09 – 0.20 (0.004 – 0.008) (NOTE 2) 0.90 – 1.45 (0.035 – 0.057) 0.35 – 0.50 0.90 – 1.30 (0.014 – 0.020) (0.035 – 0.051) FIVE PLACES (NOTE 2) S5 SOT-23 0599 NOTE: 1. DIMENSIONS ARE IN MILLIMETERS 2. DIMENSIONS ARE INCLUSIVE OF PLATING 3. DIMENSIONS ARE EXCLUSIVE OF MOLD FLASH AND METAL BURR 4. MOLD FLASH SHALL NOT EXCEED 0.254mm 5. PACKAGE EIAJ REFERENCE IS SC-74A (EIAJ) 10 0.95 (0.037) REF LT1782 U PACKAGE DESCRIPTIO Dimensions in inches (millimeters) unless otherwise noted. S6 Package 6-Lead Plastic SOT-23 (LTC DWG # 05-08-1634) 2.80 – 3.00 (0.110 – 0.118) (NOTE 3) PIN 1 1.90 (0.074) REF 2.6 – 3.0 (0.110 – 0.118) 1.50 – 1.75 (0.059 – 0.069) 0.35 – 0.55 (0.014 – 0.022) 0.00 – 0.15 (0.00 – 0.006) 0.09 – 0.20 (0.004 – 0.008) (NOTE 2) 0.95 (0.037) REF 0.90 – 1.45 (0.035 – 0.057) 0.35 – 0.50 0.90 – 1.30 (0.014 – 0.020) (0.035 – 0.051) SIX PLACES (NOTE 2) S6 SOT-23 0898 NOTE: 1. DIMENSIONS ARE IN MILLIMETERS 2. DIMENSIONS ARE INCLUSIVE OF PLATING 3. DIMENSIONS ARE EXCLUSIVE OF MOLD FLASH AND METAL BURR 4. MOLD FLASH SHALL NOT EXCEED 0.254mm 5. PACKAGE EIAJ REFERENCE IS SC-74A (EIAJ) 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. 11 LT1782 U TYPICAL APPLICATIO S Current Source VCC LT1634-1.25 R1 + LT1782 2N3906 – IOUT = 1.25V R1 1782 TA02 Protected Fault Conditions OK! –18V OK! 5V V+ LT1782 LT1782 + 24V REVERSE BATTERY OK! OK! 5V + LT1782 LT1782 10V INPUT DIFFERENTIAL VOLTAGE + 18V 5V INPUT OVERVOLTAGE INPUT BELOW GROUND 1782 TA03 RELATED PARTS PART NUMBER DESCRIPTION COMMENTS LT1783 Micropower Over-The-Top SOT-23 Rail-to-Rail Input and Output Op Amp SOT-23 Package, Micropower 210µA per Amplifier, Rail-to-Rail Input and Output , 1.25MHz GBW LT1490/LT1491 Dual/Quad Over-The-Top Micropower Rail-to-Rail Input and Output Op Amps Single Supply Input Range: –0.4V to 44V, Micropower 50µA per Amplifier, Rail-to-Rail Input and Output , 200kHz GBW LT1636 Single Over-The-Top Micropower Rail-to-Rail Input and Output Op Amp 55µA Supply Current, VCM Extends 44V Above VEE, Independent of VCC, MSOP Package, Shutdown Function LT1638/LT1639 Dual/Quad, 1.2MHz, 0.4V/µs, Over-The-Top Micropower Rail-to-Rail Input and Output Op Amps 170µA Supply Current, Single Supply Input Range: –0.4V to 44V, Rail-to-Rail Input and Output 12 Linear Technology Corporation 1782f LT/TP 0400 4K • PRINTED IN USA 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408)432-1900 ● FAX: (408) 434-0507 ● www.linear-tech.com LINEAR TECHNOLOGY CORPORATION 1999