19-1525; Rev 2; 4/01 Low-Cost, High-Slew-Rate, Rail-to-Rail I/O Op Amps in SC70 General Description Features M The MAX4490/MAX4491/MAX4492 single/dual/quad, (cid:2) 2.7V to 5.5V Single-Supply Operation A low-cost CMOS op amps feature Rail-to-Rail®input and (cid:2) 10V/µs Slew Rate X output capability from either a single 2.7V to 5.5V sup- ply or dual ±1.35V to ±2.75V supplies. These amplifiers (cid:2) Rail-to-Rail Input Common-Mode Voltage Range 4 exhibit a high slew rate of 10V/µs and a gain-bandwidth (cid:2) Rail-to-Rail Output Voltage Swing 4 product of 10MHz. They can drive 2kΩ resistive loads to within 55mV of either supply rail and remain unity- (cid:2) 10MHz Gain-Bandwidth Product 9 0 gain stable with capacitive loads up to 300pF. (cid:2) Unity-Gain Stable with Capacitive Loads / The MAX4490 is offered in the ultra-small, 5-pin SC70 Up to 300pF M package, which is 50% smaller than the standard 5-pin (cid:2) 50pA Input Bias Current A SOT23 package. Specifications for all parts are guaran- teed over the automotive (-40°C to +125°C) tempera- (cid:2) Ultra-Small, 5-Pin SC70 Package (MAX4490) X ture range. 4 4 9 Ordering Information 1 Applications / M PIN- TOP Battery-Powered Instruments PART TEMP RANGE PACKAGE MARK A Portable Equipment MAX4490AXK-T -40°C to +125°C 5 SC70-5 AAB X Audio Signal Conditioning MAX4490AUK-T -40°C to +125°C 5 SOT23-5 ADKQ 4 Low-Power/Low-Voltage Applications MAX4491AKA-T -40°C to +125°C 8 SOT23-5 AADB 4 MAX4491AUA -40°C to +125°C 8 µMAX — Sensor Amplifiers 9 MAX4492AUD -40°C to +125°C 14 TSSOP — RF Power Amplifier Control 2 MAX4492ASD -40°C to +125°C 14 SO — High-Side/Low-Side Current Sensors Pin Configurations/ Capacitive-Load Stability Functional Diagrams 6000 TOP VIEW 5000 D (pF)4000 IN+ 1 MAX4490 5 VDD A O L TIVE 3000 VSS 2 - + ACI UNSTABLE AP2000 C IN- 3 4 OUT 1000 STABLE SOT23-5/SC70-5 0 100 1k 10k 100k RESISTIVE LOAD (Ω) Pin Configurations continued at end of data sheet. Rail-to-Rail is a registered trademark of Nippon Motorola, Ltd. ________________________________________________________________Maxim Integrated Products 1 For pricing, delivery, and ordering information,please contact Maxim/Dallas Direct!at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.

Low-Cost, High-Slew-Rate, Rail-to-Rail I/O Op Amps in SC70 2 ABSOLUTE MAXIMUM RATINGS 9 Supply Voltage (VDDto VSS)....................................................6V 8-Pin µMAX (derate 4.1mW/°C above +70°C)...........330mW 4 All Other Pins...................................(VSS- 0.3V) to (VDD+ 0.3V) 14-Pin TSSOP (derate 8.3mW/°C above +70°C).......667mW Output Short-Circuit Duration.................................................10s 14-Pin SO (derate 8.3mW/°C above +70°C)..............667mW 4 Continuous Power Dissipation (TA= +70°C) Operating Temperature Range........................-40°C to +125°C X 5-Pin SC70 (derate 2.5mW/°C above +70°C)............200mW Junction Temperature.....................................................+150°C 5-Pin SOT23 (derate 7.1mW/°C above +70°C)..........571mW Storage Temperature Range............................-65°C to +150°C A 8-Pin SOT23 (derate 5.26mW/°C above +70°C)........421 mW Lead Temperature (soldering, 10s)................................+300°C M Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional / 1 operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. 9 4 ELECTRICAL CHARACTERISTICS 4 (VDD= 5V, VSS= 0, VCM= 0, VOUT= VDD/2, RL= 100kΩconnected to VDD/2, TA= TMINto TMAX, unless otherwise noted. Typical X values are at TA= +25°C.) (Note 1) A PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS M Supply Voltage Range VDD (Note 2) 2.7 5.5 V Supply Current (per amplifier) IS 0.8 2 mA / 0 TA= +25°C ±1.5 ±10 Input Offset Voltage VOS (Note 3) mV 9 TA= TMINto TMAX 16 4 Input Bias Current IB (Note 3) ±0.05 ±2.5 nA 4 Input Offset Current IOS (Note 3) ±0.05 ±2.5 nA X Input Resistance RIN 1000 MΩ A Input Common-Mode Range VCM Inferred from CMRR test VSS VDD V M Common-Mode Rejection Ratio CMRR VSS≤VCM≤VDD 54 75 dB Power-Supply Rejection Ratio PSRR 2.7V ≤VDD≤5.5V 65 100 dB (VSS + 0.25V) ≤VOUT RL= 100kΩ 110 Large-Signal Voltage Gain AV ≤(VDD - 0.25V) RL= 2kΩ 65 85 dB Specified as RL= 100kΩ 1.5 Output-Voltage Swing High VOH VDD- VOH RL= 2kΩ 55 200 mV Specified as RL= 100kΩ 1.5 Output-Voltage Swing Low VOL VOL- VSS RL= 2kΩ 35 150 mV Output Short-Circuit Current IOUT(SC) Sourcing or sinking ±50 mA Gain-Bandwidth Product GBWP CL= 10pF 10 MHz Input Capacitance CIN 5 pF Phase Margin CL= 10pF 60 degrees Gain Margin CL= 10pF 10 dB Slew Rate SR Measured from 10% to 90% of 4VP-Pstep 10 V/µs Voltage-Noise Density en ƒ= 10kHz 12 nV/√Hz Current-Noise Density in ƒ= 10kHz 1 fA√Hz Capacitive-Load Drive AV(CL)= 1, no sustained oscillations 300 pF Note 1: All units production tested at TA= +25°C. Limits over temperature guaranteed by design. Note 2: Guaranteed by the Power-Supply Rejection Ratio (PSRR) test. Note 3: Input Offset Voltage, Input Bias Current, and Input Offset Current are all tested and guaranteed at both ends of the common- mode range. 2 _______________________________________________________________________________________

Low-Cost, High-Slew-Rate, Rail-to-Rail I/O Op Amps in SC70 Typical Operating Characteristics M (VDD= 5V, VSS= 0, VCM= VDD/2, RL= 100kΩto VDD/2, TA= +25°C, unless otherwise noted.) A X SUPPLY CURRENT PER AMPLIFIER SUPPLY CURRENT PER AMPLIFIER INPUT OFFSET VOLTAGE 4 vs. TEMPERATURE vs. SUPPLY VOLTAGE vs. TEMPERATURE 4 880500 VDD = 5V MAX4490 toc 01 1980000000 MAX4490toc02 --00..024 MAX4490 toc03 90 µA) 750 µA) 700 mV) -0.6 /M URRENT ( 700 URRENT ( 560000 OLTAGE ( --10..08 A C C V SUPPLY 660500 VDD = 2.7V SUPPLY 340000 OFFSET --11..42 X4 200 -1.6 4 550 100 -1.8 9 500 0 -2.0 1 -40-25-10 5 20 35 50 65 80 95 110125 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 -40 -25-10 5 20 35 50 65 80 95 110125 TEMPERATURE (°C) SUPPLY VOLTAGE (V) TEMPERATURE (°C) /M OUTPUT SWING HIGH OUTPUT SWING LOW OP AMP GAIN AND PHASE A vs. TEMPERATURE vs. TEMPERATURE vs. FREQUENCY 7800 RVDL D= =2 k5ΩV MAX4490 toc04 7800 MAX4490 toc05 5600 MAX4490 toc06 113850 X44 V - V (mV)DDOUT 36540000 RVDL D= =2 k2Ω.7V V - V (mV)OUTSS 36540000 RVDL D= =2 k5ΩVVRDL D= =2 k2Ω.7V GAIN (dB) 14320000 PHASE GAIN -9404055 PHASE (DEGREES) 92 20 20 0 -90 VDD = 5V OR 2.7V VDD = 5V OR 2.7V 10 RL = 100kΩ 10 RL = 100kΩ -10 AV = 1000 -135 CL = 10pF 0 0 -20 -180 -40-25 -10 5 20 35 50 65 80 95 110125 -40-25 -10 5 20 35 50 65 80 95 110125 100 1k 10k 100k 1M 10M TEMPERATURE (°C) TEMPERATURE (°C) FREQUENCY (Hz) GAIN AND PHASE LARGE-SIGNAL GAIN POWER-SUPPLY REJECTION RATIO vs. FREQUENCY (WITH CLOAD) vs. TEMPERATURE vs. FREQUENCY 5600 MAX4490 toc07 113850 112300 VDD = 5V MAX4490 toc08 --12000 AV = 1 MAX4490 toc09 40 GAIN 90 B) GAIN (dB) 132000 -40455 PHASE (DEGREES) GE-SIGNAL GAIN (d 110100 PSSR (dB) ----63450000 0 PHASE -90 LAR -70 90 -80 -10 ACVL O=A 1D0 =0 0200pF -135 -90 -20 -180 80 -100 100 1k 10k 100k 1M 10M -40-25-10 5 20 35 50 65 80 95 110125 10 100 1k 10k 100k 1M 10M FREQUENCY (Hz) TEMPERATURE (°C) FREQUENCY (Hz) _______________________________________________________________________________________ 3

Low-Cost, High-Slew-Rate, Rail-to-Rail I/O Op Amps in SC70 2 Typical Operating Characteristics (continued) 9 (VDD= 5V, VSS= 0, VCM= VDD/2, RL= 100kΩto VDD/2, TA= +25°C, unless otherwise noted.) 4 4 TOTAL HARMONIC DISTORTION PLUS LARGE-SIGNAL TRANSIENT RESPONSE X OUTPUT IMPEDANCE vs. FREQUENCY NOISE vs. FREQUENCY (NONINVERTING) MA 1010k AV = 1 MAX4490 toc10 00..004305 A25V0V0 p=k- pH1 VzS /LIVGONWAPLASS FILTER MAX4490 toc11 IN MAX4490toc12 4491/ ΩUT IMPEDANCE () 110 HD + NOISE (%) 0000....000012235050 RL = 2kΩ V/div P T X OUT 0.010 RL = 10kΩ OUT 0.1 A V/div 0.005 M 0.01 0 40µs/div / 100 1k 10k 100k 1M 10M 10 100 1k 10k 100k AV = 1 0 FREQUENCY (Hz) FREQUENCY (Hz) 9 4 LARGE-SIGNAL TRANSIENT RESPONSE SMALL-SIGNAL TRANSIENT RESPONSE SMALL-SIGNAL TRANSIENT RESPONSE (INVERTING) (NONINVERTING) (INVERTING) 4 AX MAX4490toc13 MAX4490toc14 MAX4490toc15 IN IN IN M 2V/div 50mV/div 50mV/div OUT OUT OUT 2V/div 50mV/div 50mV/div 40µs/div 40µs/div 40µs/div AV = -1 AV = 1 AV = -1 MAX4491/MAX4492 POWER-UP TRANSIENT RESPONSE SLEW RATE vs. SUPPLY VOLTAGE CROSSTALK vs. FREQUENCY MAX4490toc16 1102 MAX4490 toc17 -200 MAX4492toc18 VDD µS) 8 -40 2V/div W RATE (V/ 6 STALK (dB) -60 SLE 4 ROS -80 C OUT 2 AV = 1 -100 1V/div 10% TO 90% STEP 0 -120 4µs/div 2.5 3.0 3.5 4.0 4.5 5.0 5.5 0.001 0.01 0.1 1 10 100 1000 AV = 1, VIN CONNECTED TO VDD/2, RL = 2kΩ SUPPLY VOLTAGE (V) FREQUENCY (MHz) 4 _______________________________________________________________________________________

Low-Cost, High-Slew-Rate, Rail-to-Rail I/O Op Amps in SC70 Pin Description M PIN A NAME FUNCTION X MAX4490 MAX4491 MAX4492 4 1 — — IN+ Noninverting Input 4 2 4 11 VSS Negative Supply Input. Connect to ground for single-supply operation. 9 3 — — IN- Inverting Input 0 / 4 — — OUT Amplifier Output M 5 8 4 VDD Positive Supply Input A X — 3 3 INA+ Noninverting Input to Amplifier A 4 — 2 2 INA- Inverting Input to Amplifier A 4 — 1 1 OUTA Amplifier A Output 9 — 5 5 INB+ Noninverting Input to Amplifier B 1 / — 6 6 INB- Inverting Input to Amplifier B M — 7 7 OUTB Amplifier B Output A — — 10, 12 INC+, IND+ Noninverting Inputs to Amplifiers C and D X 4 — — 9, 13 INC-, IND- Inverting Inputs to Amplifiers C and D 4 — — 8, 14 OUTC, OUTD Amplifiers C and D Outputs 9 2 Detailed Description the load is connected to VDD/2. Consistent resistive- drive capability is (2.5 - 0.1) / 2.2 = 1.1kΩ. For the same Rail-to-Rail Input Stage application, resistive-drive capability is 2.2kΩ when the The MAX4490/MAX4491/MAX4492 CMOS operational load is connected to VDDor VSS. amplifiers have parallel-connected N- and P-channel Applications Information differential input stages that combine to accept a com- mon-mode range extending to both supply rails. The N- Power-Supply Considerations channel stage is active for common-mode input The MAX4490/MAX4491/MAX4492 operate from a sin- voltages typically greater than (VSS + 1.2V), and the P- gle 2.7V to 5.5V supply or from dual ±1.35V to ±2.75V channel stage is active for common-mode input volt- supplies with typically 800µA supply current per ampli- ages typically less than (VDD- 1.2V). fier. A high power-supply rejection ratio of 100dB Rail-to-Rail Output Stage allows for extended operation from a decaying battery The MAX4490/MAX4491/MAX4492 CMOS operational voltage, thereby simplifying designs for portable appli- amplifiers feature class-AB push-pull output stages that cations. For single-supply operation, bypass the power can drive a 100kΩload to within 1.5mV of either supply supply with a 0.1µF ceramic capacitor placed close to rail. Short-circuit output current is typically ±50mA. the VDD pin. For dual-supply operation, bypass each supply to ground. Figures 1a and 1b show the typical temperature depen- dence of output source and sink currents, respectively, Input Capacitance for three fixed values of (VDD - VOH) and (VOL - VSS). One consequence of the parallel-connected differential For example, at VDD= 5.0V, the load currents that main- input stages for rail-to-rail operation is a relatively large tain (VDD - VOH) = 100mV and (VOL - VSS) = 100mV at input capacitance CIN(typically 5pF). This introduces a TA = +25°C are 2.2mA and 3.3mA, respectively, when _______________________________________________________________________________________ 5

Low-Cost, High-Slew-Rate, Rail-to-Rail I/O Op Amps in SC70 2 pole at frequency (2πR′CIN)-1, where R′ is the parallel capacitor Cf between the inverting input and output. 9 combination of the gain-setting resistors for the invert- Choose Cfas follows: ing or noninverting amplifier configuration (Figure 2). If 4 Cf= 5(R / Rf) [pf] the pole frequency is less than or comparable to the 4 unity-gain bandwidth (10MHz), the phase margin will where Rf is the feedback resistor and R is the gain-set- X be reduced, and the amplifier will exhibit degraded ting resistor (Figure 2). AC performance through either ringing in the step Figure 3 shows the step response for a noninverting A response or sustained oscillations. The pole frequency is amplifier subject to R′ = 4kΩ with and without the Cf M 10MHz when R′= 3.2kΩ. To maximize stability, R′<3kΩ feedback capacitor. is recommended. / 1 Applications that require rail-to-rail operation with mini- 9 mal loading (for small VDD - VOH and VOL - VSS) will 4 typically require R′ values >3kΩ. To improve step 4 response under these conditions, connect a small X A 6 INVERTING M VVDDDD -- VVOOHH == 210000mmVV Cf A) 5 VDD - VOH = 50mV / m 90 RENT ( 4 VDD = 2.7V VDD = 5V Rf R U 4 CE C 3 VIN R 4 UR X T SO 2 VOUT PU MAX4490 A UT O 1 R′ = R || Rf M RfCf = RCIN 0 -40-25-10 5 20 35 50 65 80 95 110125 TEMPERATURE (°C) Figure 1a. Output Source Current vs. Temperature NONINVERTING VIN 9 VDD - VOH = 200mV VOUT 8 VDD - VOH = 100mV MAX4490 A) 7 VDD - VOH = 50mV ENT (m 6 VDD = 2.7V VDD = 5V Rf R UR 5 K C Cf N 4 SI T U 3 P OUT 2 R RR′fC =f R= R|| CRIfN 1 0 -40 -25 -10 5 20 35 50 65 80 95110125 TEMPERATURE (°C) Figure 2. Inverting and Noninverting Amplifier with Feedback Compensation Figure 1b. Output Sink Current vs. Temperature 6 _______________________________________________________________________________________

Low-Cost, High-Slew-Rate, Rail-to-Rail I/O Op Amps in SC70 Driving Capacitive Loads Improve stability for large capacitive loads by adding M In conjunction with op amp output resistance, capaci- an isolation resistor (typically 10Ω) in series with the tive loads introduce a pole frequency that can reduce output (Figure 5). Note that the isolation resistor forms a A phase margin and lead to unstable operation. The voltage divider with potential for gain error. X MAX4490/MAX4491/MAX4492 drive capacitive loads Chip Information 4 up to 300pF without significant degradation of step response and slew rate (Figure 4). Capacitive-Load MAX4490 TRANSISTOR COUNT: 60 4 Stability (page 1) shows regions of stable and margin- MAX4491 TRANSISTOR COUNT: 120 9 ally stable (step overshoot <10%) operation for different MAX4492 TRANSISTOR COUNT: 240 0 combinations of capacitive and resistive loads. SUBSTRATECONNECTED TO VSS / M A 3a) 4a) X 4 4 9 1 / M A X 4 4 WITHOUT FEEDBACK COMPENSATION WITHOUT CAPACITIVE LOADING 9 AV = -1, RL = 4kΩ, Cf = 0 AV = +1, RL = 100kΩ, CL = 0 2 3b) 4b) WITH FEEDBACK COMPENSATION WITH CAPACITIVE LOADING AV = -1, RL = 4kΩ, Cf = 5pF AV = +1, RL = 100kΩ, CL = 300pF Figure 3. Step Response With and Without Feedback Figure 4. Step Response With and Without Capacitive Loading Compensation _______________________________________________________________________________________ 7

Low-Cost, High-Slew-Rate, Rail-to-Rail I/O Op Amps in SC70 2 Pin Configurations/ 9 Functional Diagrams (continued) 4 4 X TOP VIEW A OUTA 1 14 OUTD M VIN INA- 2 - + + - 13 IND- 1/ RS VOUT OIUNTAA- 12 - + MAX4491 78 VODUDTB INA+ 3 12 IND+ + - 9 MAX4490 INA+ 3 6 INB- VDD 4 MAX4492 11 VSS 4 CLOAD VSS 4 5 INB+ INB+ 5 10 INC+ 4 SOT23-8/µMAX INB- 6 - + + - 9 INC- X OUTB 7 8 OUTC A TSSOP/SO M / 0 Figure 5. Isolation Resistor for Large Capacitive Loads 9 Package Information 4 4 AX C70, 5L.EPS S M Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. 8 _____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 © 2001 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.