MIC7111 Micrel MIC7111 1.8V IttyBitty™ Rail-to-Rail Input/Output Op Amp Preliminary Information General Description Features The MIC7111 is a micropower operational amplifier featuring rail-to-rail input and output performance in Micrel’s IttyBitty™ SOT-23-5 package. The MIC7111 is ideal for systems where small size is a critical consideration. • • • • • Small footprint SOT-23-5 package Guaranteed performance at 1.8V, 2.7V, 5V, and 10V 15µA typical supply current at 1.8V 25kHz gain-bandwidth at 5V Output swing to within 1mV of rails with 1.8V supply and 100kΩ load • Suitable for driving capacitive loads The MIC7111 is designed to operate from 1.8V to 11V power supplies. The MIC7111 benefits small battery operated portable electronic devices where small size and the ability to place the amplifier close to the signal source are primary design concerns. For other package options, please contact the factory. Applications • • • • • • Wireless and cellular communications GaAs RF amplifier bias amplifier Current sensing for battery chargers Reference voltage buffer Transducer linearization and interface Portable computing Ordering Information Junction Temp. Range Package MIC7111BM5 –40°C to +85°C SOT-23-5 Functional Configuration Pin Configuration IN+ Part Number IN+ V+ OUT 3 2 1 Part Identification 3 V+ OUT 2 1 A13 4 IN– 5 4 5 V– IN– V– SOT-23-5 (M5) Pin Description Pin Number Pin Name Pin Function 1 OUT Amplifier Output 2 V+ Positive Supply 3 IN+ Noninverting Input 4 IN– Inverting Input 5 V– Negative Suppy IttyBitty is a trademark of Micrel, Inc. Micrel, Inc. • 1849 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 944-0970 • http://www.micrel.com June 1998 1 MIC7111 MIC7111 Micrel Absolute Maximum Ratings (Note 1) Operating Ratings (Note 1) Supply Voltage (VV+ – VV–) ........................................... 12V Differential Input Voltage (VIN+ – VIN–) ........... ±(VV+ – VV–) I/O Pin Voltage (VIN, VOUT), Note 2 ............................................. VV+ + 0.3V to VV– – 0.3V Junction Temperature (TJ) ...................................... +150°C Storage Temperature ............................... –65°C to +150°C Lead Temperature (soldering, 10 sec.) ..................... 260°C ESD, Note 5 .................................................................. 2kV Supply Voltage (VV+ – VV–) .............................. 1.8V to 11V Junction Temperature (TJ) ......................... –40°C to +85°C Max. Junction Temperature (TJ(max)), Note 3 ........... +85°C Package Thermal Resistance (θJA), Note 4.......... 325°C/W Max. Power Dissipation ............................................ Note 3 DC Electrical Characteristics (1.8V) VV+ = +1.8V, VV– = 0V, VCM = VOUT = VV+/2; RL = 1M; TJ = 25°C, bold values indicate –40°C ≤ TJ ≤ +85°C; unless noted Symbol Parameter VOS Condition Min Typ Max Units Input Offset Voltage 0.9 7 9 mV mV TCVOS Input Offset Voltage Temperature Drift 2.0 IB Input Bias Current IOS µV/°C 1 10 500 pA pA Input Offset Current 0.01 0.5 75 pA pA RIN Input Resistance >10 TΩ +PSRR Positive Power Supply Rejection Ratio 1.8V ≤ VV+ ≤ 5V, VV– = 0V, VCM = VOUT = 0.9V 60 85 dB –PSRR Negative Power Supply Rejection Ratio –1.8V ≤ VV– ≤ –5V, VV+ = 0V, VCM = VOUT = –0.9V 60 85 dB CMRR Common-Mode Rejection Ratio VCM = –0.2V to +2.0V 50 70 dB CIN Common Mode Input Capacitance 3 pF VOUT Output Voltage Swing ISC AVOL Is Output Short Circuit Current Note 6 Voltage Gain Supply Current output high, RL = 100k, specified as VV+ – VOUT 0.14 1 1 mV mV output low, RL = 100k 0.14 1 1 mV mV output high, RL = 2k, specified as VV+ – VOUT 6.8 23 34 mV mV output low, RL = 2k 6.8 23 34 mV mV sourcing, VOUT = 0V 15 25 mA sinking, VOUT = 1.8V 15 25 mA sourcing 400 V/mV sinking 400 V/mV VV+ = 1.8V, VOUT = VV+/2 15 35 µA AC Electrical Characteristics (1.8V) V+ = +1.8V, V– = 0V, VCM = VOUT = VV+/2; RL = 1M; TJ = 25°C, bold values indicate –40°C ≤ TJ ≤ +85°C; unless noted SR Slew Rate GBW Gain Bandwidth Product MIC7111 voltage follower, 1V step, RL = [email protected] VOUT = 1VP–P 2 0.015 V/µs 25 kHz June 1998 MIC7111 Micrel DC Electrical Characteristics (2.7V) VV+ = +2.7V, VV– = 0V, VCM = VOUT = VV+/2; RL = 1M; TJ = 25°C, bold values indicate –40°C ≤ TJ ≤ +85°C; unless noted Symbol Parameter VOS Condition Min Typ Max Units Input Offset Voltage 0.9 7 9 mV mV TCVOS Input Offset Voltage Temperature Drift 2.0 IB Input Bias Current IOS µV/°C 1 10 500 pA pA Input Offset Current 0.01 0.5 75 pA pA RIN Input Resistance >10 TΩ +PSRR Positive Power Supply Rejection Ratio 2.7V ≤ VV+ ≤ 5V, VV– = 0V, VCM = VOUT = 1.35V 60 90 dB –PSRR Negative Power Supply Rejection Ratio –2.7V ≤ VV– ≤ –5V, VV+ = 0V, VCM = VOUT = –1.35V 60 90 dB CMRR Common-Mode Rejection Ratio VCM = –0.2V to +2.9V 52 75 dB CIN Common Mode Input Capacitance 3 pF VOUT Output Voltage Swing ISC AVOL Is Output Short Circuit Current Note 6 Voltage Gain Supply Current output high, RL = 100k, specified as VV+ – VOUT 0.2 1 1 mV mV output low, RL = 100k 0.2 1 1 mV mV output high, RL = 2k, specified as VV+ – VOUT 10 33 50 mV mV output low, RL = 2k 10 33 50 mV mV sourcing, VOUT = 0V 30 50 mA sinking, VOUT = 2.7V 30 50 mA sourcing 400 V/mV sinking 400 V/mV VV+ = 2.7V, VOUT = VV+/2 17 42 µA Max Units AC Electrical Characteristics (2.7V) V+ = +2.7V, V– = 0V, VCM = VOUT = VV+/2; RL = 1M; TJ = 25°C, bold values indicate –40°C ≤ TJ ≤ +85°C; unless noted Symbol Parameter Condition SR Slew Rate voltage follower, 1V step, RL = [email protected] VOUT = 1VP–P GBW Gain Bandwidth Product June 1998 Min 3 Typ 0.015 V/µs 25 kHz MIC7111 MIC7111 Micrel DC Electrical Characteristics (5V) VV+ = +5.0V, VV– = 0V, VCM = VOUT = VV+/2; RL = 1M; TJ = 25°C, bold values indicate –40°C ≤ TJ ≤ +85°C; unless noted Symbol Parameter VOS Condition Min Typ Max Units Input Offset Voltage 0.9 7 9 mV mV TCVOS Input Offset Voltage Temperature Drift 2.0 IB Input Bias Current IOS µV/°C 1 10 500 pA pA Input Offset Current 0.01 0.5 75 pA pA RIN Input Resistance >10 TΩ +PSRR Positive Power Supply Rejection Ratio 5V ≤ VV+ ≤ 10V, VV– = 0V, VCM = VOUT = 2.5V 65 95 dB –PSRR Negative Power Supply Rejection Ratio –5V ≤ VV– ≤ –10V, VV+ = 0V, VCM = VOUT = –2.5V 65 95 dB CMRR Common-Mode Rejection Ratio VCM = –0.2V to +5.2V 57 80 dB CIN Common Mode Input Capacitance 3 pF VOUT Output Voltage Swing ISC AVOL IS Output Short Circuit Current Note 6 Voltage Gain Supply Current output high, RL = 100k, specified as VV+ – VOUT 0.3 1.5 1.5 mV mV output low, RL = 100k 0.3 1.5 1.5 mV mV output high, RL = 2k, specified as VV+ – VOUT 15 50 75 mV mV output low, RL = 2k 15 50 75 mV mV sourcing, VOUT = 0V 80 100 mA sinking, VOUT = 5V 80 100 mA sourcing 500 V/mV sinking 500 V/mV VV+ = 5V, VOUT = VV+/2 20 50 µA Max Units AC Electrical Characteristics (5V) V+ = +5V, V– = 0V, VCM = VOUT = VV+/2; RL = 1M; TJ = 25°C, bold values indicate –40°C ≤ TJ ≤ +85°C; unless noted Symbol Parameter Condition Min SR Slew Rate voltage follower, 1V step, RL = [email protected] VOUT = 1VP–P GBW Gain Bandwidth Product Typ 0.02 V/µs 25 kHz DC Electrical Characteristics (10V) VV+ = +10V, VV– = 0V, VCM = VOUT = VV+/2; RL = 1M; TJ = 25°C, bold values indicate –40°C ≤ TJ ≤ +85°C; unless noted Symbol Parameter VOS TCVOS MIC7111 Condition Min Typ Max Units Input Offset Voltage 0.9 7 9 mV mV Input Offset Voltage Temperature Drift 2.0 4 µV/°C June 1998 MIC7111 Micrel Symbol Parameter IB Input Bias Current IOS Typ Max Units 1 10 500 pA pA Input Offset Current 0.01 0.5 75 pA pA RIN Input Resistance >10 TΩ +PSRR Positive Power Supply Rejection Ratio 5V ≤ VV+ ≤ 10V, VV– = 0V, VCM = VOUT = 2.5V 65 95 dB –PSRR Negative Power Supply Rejection Ratio –5V ≤ VV– ≤ –10V, VV+ = 0V, VCM = VOUT = –2.5V 65 95 dB CMRR Common-Mode Rejection Ratio VCM = –0.2V to +10.2V 60 85 dB CIN Common Mode Input Capacitance 3 pF VOUT Output Voltage Swing ISC Output Short Circuit Current Note 6 AVOL Voltage Gain IS Supply Current Condition Min output high, RL = 100k, specified as VV+ – VOUT 0.45 2.5 2.5 mV mV output low, RL = 100k 0.45 2.5 2.5 mV mV output high, RL = 2k, specified as VV+ – VOUT 24 80 120 mV mV output low, RL = 2k 24 80 120 mV mV sourcing, VOUT = 0V 100 200 mA sinking, VOUT = 10V 100 200 mA sourcing 500 V/mV sinking 500 V/mV VV+ = 10V, VOUT = VV+/2 25 65 µA Max Units AC Electrical Characteristics (10V) V+ = +10V, V– = 0V, VCM = VOUT = VV+/2; RL = 1M; TJ = 25°C, bold values indicate –40°C ≤ TJ ≤ +85°C; unless noted Symbol Parameter Condition Min SR Slew Rate voltage follower, 1V step, RL = [email protected] VOUT = 1VP–P GBW Typ 0.02 V/µs Gain Bandwidth Product 25 kHz φM Phase Margin 50 ° GM Gain Margin 15 dB eN Input Referred Voltage Noise f = 1kHz, VCM = 1.0V 110 nV/ Hz iN Input Referred Current Noise f = 1kHz 0.03 pA/ Hz General Notes: Devices are ESD protected; however, handling precautions are recommended. All limits guaranteed by testing on statistical analysis. Note 1: Absolute maximum ratings indicate limits beyond which damage to the component may occur. Electrical specifications do not apply when operating the device outside its recommended operating ratings. Note 2: I/O Pin Voltage is any external voltage to which an input or output is referenced. Note 3: The maximum allowable power dissipation is a function of the maximum junction temperature, TJ(max); the junction-to-ambient thermal resistance, θJA; and the ambient temperature, TA. The maximum allowable power dissipation at any ambient temperature is calculated using: PD = (TJ(max) – TA) ÷ θJA. Exceeding the maximum allowable power dissipation will result in excessive die temperature. Note 4: Thermal resistance, θJA, applies to a part soldered on a printed-circuit board. Note 5: Human body model, 1.5k in series with 100pF. Note 6: Short circuit may cause the device to exceed maxium allowable power dissipation. See Note 3. June 1998 5 MIC7111 MIC7111 Micrel Driving Capacitive Loads Driving a capacitive load introduces phase-lag into the output signal, and this in turn reduces op-amp system phase margin. The application that is least forgiving of reduced phase margin is a unity gain amplifier. The MIC7111 can typically drive a 500pF capacitive load connected directly to the output when configured as a unity-gain amplifier. Application Information Input Common-Mode Voltage The MIC7111 tolerates input overdrive by at least 300mV beyond either rail without producing phase inversion. If the absolute maximum input voltage is exceeded, the input current should be limited to ±5mA maximum to prevent reducing reliability. A 10kΩ series input resistor, used as a current limiter, will protect the input structure from voltages as large as 50V above the supply or below ground. See Figure 1. RIN Using Large-Value Feedback Resistors A large-value feedback resistor (> 500kΩ) can reduce the phase margin of a system. This occurs when the feedback resistor acts in conjunction with input capacitance to create phase lag in the fedback signal. Input capacitance is usually a combination of input circuit components and other parasitic capacitance, such as amplifier input capacitance and stray printed circuit board capacitance. Figure 2 illustrates a method of compensating phase lag caused by using a large-value feedback resistor. Feedback capacitor CFB introduces sufficient phase lead to overcome the phase lag caused by feedback resistor RFB and input capacitance CIN. The value of CFB is determined by first estimating CIN and then applying the following formula: VOUT VIN 10kΩ Figure 1. Input Current-Limit Protection Output Voltage Swing Sink and source output resistances of the MIC7111 are equal. Maximum output voltage swing is determined by the load and the approximate output resistance. The output resistance is: ROUT = RIN × CIN ≤ RFB × CFB CFB VDROP RFB ILOAD VDROP is the voltage dropped within the amplifier output stage. VDROP and ILOAD can be determined from the VO (output swing) portion of the appropriate Electrical Characteristics table. ILOAD is equal to the typical output high voltage minus V+/2 and divided by RLOAD. For example, using the Electrical Characteristics DC (5V) table, the typical output voltage drop using a 2kΩ load (connected to V+/2) is 0.015V, which produces an ILOAD of: VIN RIN VOUT CIN Figure 2. Cancelling Feedback Phase Lag 2.5V − 0.015V = 1.243mA 2kΩ Since a significant percentage of CIN may be caused by board layout, it is important to note that the correct value of CFB may then: ROUT = MIC7111 15mV = 12.1 ≈ 12Ω 1.243mA 6 June 1998 MIC7111 Micrel VS 0.5V to Q1 VCEO(sus) change when changing from a breadboard to the final circuit layout. Typical Circuits Some single-supply, rail-to-rail applications for which the MIC7111 is well suited are shown in the circuit diagrams of Figures 3 through 7. 3 VIN 0V to 2V V+ 1.8V to 10V 2 VOUT 0V to V+ Load V+ 1.8V to 10V MIC7111 IOUT 1 Q1 VCEO = 40V 2N3904 IC(max) = 200mA 4 { 5 3 VIN 1 V+ AV 0V to MIC7111 2 VOUT 0V to V+ 4 5 RS 10Ω 1⁄2W Change Q1 and RS for higher current and/or different gain. IOUT = R2 910k R1 100k VIN = 100mA/V as shown RS Figure 5. Voltage-Controlled Current Sink R4 Figure 3a. Noninverting Amplifier 100k V+ C1 0.001µF 100 V+ 2 4 MIC7111 VOUT (V) 1 3 A V = 1+ 5 R2 ≈ 10 R1 V+ 0 0 R2 R4 100k 100k 100 VIN (V) VOUT V+ 0V R3 100k Figure 3b. Noninverting Amplifier Behavior Figure 6. Square Wave Oscillator V+ 1.8V to 10V VIN 0V to V+ 3 2 CIN MIC7111 1 4 R1 R2 33k 330k V+ VOUT 0V to V+ 5 2 4 MIC7111 COUT 1 VOUT = VIN 3 5 RL VOUT 0V Figure 4. Voltage Follower/Buffer V+ R3 330k R2 C1 1µF 330k = = −10 R4 A V = − R1 33k 330k Figure 7. AC-Coupled Inverting Amplifier June 1998 7 MIC7111 MIC7111 Micrel Package Information 1.90 (0.075) REF 0.95 (0.037) REF 1.75 (0.069) 1.50 (0.059) 3.00 (0.118) 2.60 (0.102) DIMENSIONS: MM (INCH) 1.30 (0.051) 0.90 (0.035) 3.02 (0.119) 2.80 (0.110) 0.20 (0.008) 0.09 (0.004) 10° 0° 0.15 (0.006) 0.00 (0.000) 0.50 (0.020) 0.35 (0.014) 0.60 (0.024) 0.10 (0.004) SOT-23-5 (M5) MICREL INC. 1849 FORTUNE DRIVE SAN JOSE, CA 95131 TEL + 1 (408) 944-0800 FAX + 1 (408) 944-0970 WEB USA http://www.micrel.com This information is believed to be accurate and reliable, however no responsibility is assumed by Micrel for its use nor for any infringement of patents or other rights of third parties resulting from its use. No license is granted by implication or otherwise under any patent or patent right of Micrel Inc. © 1998 Micrel Incorporated MIC7111 8 June 1998