MIC7300 Micrel MIC7300 High-Output Drive Rail-to-Rail Op Amp General Description Features The MIC7300 is a high-performance CMOS operational amplifier featuring rail-to-rail input and output with strong output drive capability. It is able to source and sink in excess of 80mA into large capacitive loads. * * * * * * * The input common-mode range extends beyond the rails by 300mV, and the output voltage typically swings to within 150V of both rails when driving a 100k load. Small footprint SOT-23-5 and power MSOP-8 packages >80mA peak output sink and source with 5V supply Drives large capacitive loads (6000pF with 10V supply) Guaranteed 2.2V, 3V, 5V, and 10V performance 500kHz gain-bandwidth product 0.01% total harmonic distortion at 1kHz (10V, 2k) 1mA typical power supply current at 5V Applications The amplifier operates from 2.2V to 10V and is fully specified at 2.2V, 3V, 5V, and 10V. Gain bandwidth and slew rate are 500kHz and 0.5V/s, respectively. * Battery-powered instrumentation * PCMCIA, USB peripherals * Portable computers and PDAs The MIC7300 is available in Micrel's IttyBittyTM SOT-23-5 package for space-conscious circuits and in high-power MM8TM 8-lead MSOP for improved heat dissipation in higher power applications. Ordering Information Pin Configurations Part Number IN+ Standard V- OUT 3 2 Part Identification 1 A17 4 5 IN- V+ SOT-23-5 (M5) Pb-free Temp. Range Package MIC7300BM5 MIC7300YM5 -40C to +85C SOT-23-5 MIC7300BMM MIC7300YMM -40C to +85C MSOP-8 Functional Configuration IN+ V- OUT 3 V+ 1 8 V- IN- 2 7 V- IN+ 3 6 V- OUT 4 V- 5 2 1 4 5 IN- V+ SOT-23-5 (M5) MSOP-8 (MM) Pin Description Pin Number SOT-23-5 Pin Number MSOP-8 Pin Name Pin Function 1 4 OUT 2 5-8 V- Negative Supply: Negative supply for split supply application or ground for single supply application. 3 3 IN+ Noninverting Input 4 2 IN- Inverting Input 5 1 V+ Positive Supply Amplifier Output IttyBitty and MM8 are trademarks of Micrel, Inc. Micrel, Inc. * 2180 Fortune Drive * San Jose, CA 95131 * USA * tel + 1 (408) 944-0800 * fax + 1 (408) 474-1000 * http://www.micrel.com June 2005 1 MIC7300 MIC7300 Micrel Absolute Maximum Ratings (Note 1) Operating Ratings (Note 2) Supply Voltage (VV+ - VV-) ........................................... 12V Differential Input Voltage (VIN+ - VIN-) ....................... 12V I/O Pin Voltage (VIN, VOUT), Note 3 ............................................. VV+ + 0.3V to VV- - 0.3V Junction Temperature (TJ) ...................................... +150C Storage Temperature ............................... -65C to +150C Lead Temperature (soldering, 10 sec.) ..................... 260C ESD, Note 6 Supply Voltage (VV+ - VV-) .............................. 2.2V to 10V Junction Temperature (TJ) ......................... -40C to +85C Package Thermal Resistance, Note 5 SOT-23-5 (JA) .................................................. 260C/W MSOP-8 (JA) ...................................................... 85C/W Max. Power Dissipation ............................................ Note 4 DC Electrical Characteristics (2.2V) VV+ = +2.2V, VV- = 0V, VCM = VOUT = VV+/2; RL = 1M; TJ = 25C, bold values indicate -40C TJ +85C; Note 7; unless noted Symbol Parameter VOS Typ Max Units Input Offset Voltage 1.0 9 mV TCVOS Input Offset Voltage Average Drift 1.0 V/C IB Input Bias Current 0.5 pA IOS Input Offset Current 0.25 pA RIN Input Resistance >1 T CMRR Common-Mode Rejection Ratio 0V VCM 2.2V, Note 9 65 dB VCM Input Common-Mode Voltage input low, CMRR 45dB PSRR Power Supply Rejection Ratio CIN Common-Mode Input Capacitance VO Output Swing Condition Min 45 -0.3 0.0 V input high, CMRR 45dB 2.2 2.5 V VV+ = VV- = 1.1V to 2.5V, VCM = 0 55 75 dB 3 pF output high, RL = 100k, specified as VV+ - VOUT 0.15 1 1 mV mV output low, RL = 100k 0.15 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 output high, RL = 600 specified as VV+ - VOUT 33 110 165 mV mV output low, RL = 600 33 110 165 mV mV ISC Output Short Circuit Current sinking or sourcing, Note 8 IS Supply Current VOUT = V+/2 20 40 0.7 mA 2.0 mA AC Electrical Characteristics (2.2V) VV+ = 2.2V, VV- = 0V, VCM = VOUT = VV+/2; RL = 1M; TJ = 25C, bold values indicate -40C TJ +85C; Note 7; unless noted Symbol Parameter SR Slew Rate 0.5 V/s GBW Gain-Bandwidth Product 0.55 MHz m Phase Margin CL = 0pF 80 CL = 2500pF 40 10 dB Gm MIC7300 Condition Min Gain Margin 2 Typ Max Units June 2005 MIC7300 Micrel DC Electrical Characteristics (3.0V) VV+ = +3.0V, VV- = 0V, VCM = VOUT = VV+/2; RL = 1M; TJ = 25C, bold values indicate -40C TJ +85C; Note 7; unless noted Symbol Parameter VOS Typ Max Units Input Offset Voltage 1.0 9 mV TCVOS Input Offset Voltage Average Drift 1.0 V/C IB Input Bias Current 0.5 pA IOS Input Offset Current 0.25 pA RIN Input Resistance >1 T CMRR Common-Mode Rejection Ratio 0V VCM 3.0V, Note 9 70 dB VCM Input Common-Mode Voltage input low, CMRR 50dB PSRR Power Supply Rejection Ratio CIN Common-Mode Input Capacitance VOUT Output Swing ISC Output Short Circuit Current IS Supply Current Condition Min 50 -0.3 0 V input high, CMRR 50dB 3.0 3.3 V VV+ = VV- = 1.5V to 5.0V, VCM = 0 55 75 dB 3 pF 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 output high, RL = 600 specified as VV+ - VOUT 33 110 165 mV mV output low, RL = 600 33 110 165 mV mV sinking or sourcing, Note 8 60 95 0.8 mA 2.2 mA AC Electrical Characteristics (3V) VV+ = 3V, VV- = 0V, VCM = 1.5V, VOUT = VV+/2; RL = 1M; TJ = 25C, bold values indicate -40C TJ +85C; Note 7; unless noted Symbol Parameter SR Slew Rate 0.5 V/s GBW Gain-Bandwidth Product 0.45 MHz m Phase Margin CL = 0pF 85 CL = 3500pF 40 10 dB Gm June 2005 Condition Min Gain Margin 3 Typ Max Units MIC7300 MIC7300 Micrel DC Electrical Characteristics (5V) VV+ = +5.0V, VV- = 0V, VCM = 1.5V, VOUT = VV+/2; RL = 1M; TJ = 25C, bold values indicate -40C TJ +85C; Note 7; unless noted Symbol Parameter VOS Typ Max Units Input Offset Voltage 1.0 9 mV TCVOS Input Offset Voltage Average Drift 1.0 V/C IB Input Bias Current 0.5 pA IOS Input Offset Current 0.25 pA RIN Input Resistance >1 T CMRR Common-Mode Rejection Ratio 0V VCM 5V, Note 9 80 dB VCM Input Common-Mode Voltage input low, CMRR 55dB PSRR Power Supply Rejection Ratio CIN Common-Mode Input Capacitance VOUT Output Swing Condition Min 55 -0.3 -0.0 V input high, CMRR 55dB 5.0 5.3 V VV+ = VV- = 2.5V to 5.0V, VCM = 0 55 75 dB 3 pF output high, RL = 100k specified as VV+ - VOUT 0.3 1.0 1.5 mV mV output low, RL = 100k 0.3 1.0 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 output high, RL = 600 specified as VV+ - VOUT 50 165 250 mV mV output low, RL = 600 50 165 250 mV mV ISC Output Short Circuit Current sinking or sourcing, Note 8 IS Supply Current VOUT = V+/2 85 105 1.0 mA 2.8 mA AC Electrical Characteristics (5V) VV+ = 5V, VV- = 0V, VCM = 1.5V, VOUT = VV+/2; RL = 1M; TJ = 25C, bold values indicate -40C TJ +85C; Note 7; unless noted Symbol Parameter Condition Min THD Total Harmonic Distortion f = 1kHz, AV = -2, RL = 2k, VOUT = 4.0 VPP SR Typ Max Units 0.05 % Slew Rate 0.5 V/s GBW Gain-Bandwidth Product 0.4 MHz m Phase Margin CL = 0pF 85 CL = 4500pF 40 10 dB Gm MIC7300 Gain Margin 4 June 2005 MIC7300 Micrel DC Electrical Characteristics (10V) VV+ = +10V, VV- = 0V, VCM = 1.5V, VOUT = VV+/2; RL = 1M; TJ = 25C, bold values indicate -40C TJ +85C; Note 7; unless noted Symbol Parameter VOS Condition Min Typ Max Units Input Offset Voltage 1.0 9 mV TCVOS Input Offset Voltage Average Drift 1.0 V/C IB Input Bias Current 0.5 pA IOS Input Offset Current 0.25 pA RIN Input Resistance >1 T CMRR Common-Mode Rejection Ratio 0V VCM 10V, Note 9 85 dB VCM Input Common-Mode Voltage input low, V+ = 10V, CMRR 60dB 60 -0.3 -0.0 V input high, V+ = 10V, CMRR 60dB 10.0 10.3 V PSRR Power Supply Rejection Ratio VV+ = VV- = 2.5V to 5.0V, VCM = 0 55 75 dB AV Large Signal Voltage Gain sourcing or sinking, RL = 2k, Note 10 80 340 V/mV sourcing or sinking, RL = 600, Note 10 15 300 V/mV 3 pF CIN Common-Mode Input Capacitance VOUT Output Swing output high, RL = 100k specified as VV+ - VOUT 0.5 1.5 2.5 mV mV output low, RL = 100k 0.5 1.5 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 output high, RL = 600 specified as VV+ - VOUT 80 270 400 mV mV output low, RL = 600 80 270 400 mV mV ISC Output Short Circuit Current sinking or sourcing, Notes 8 IS Supply Current VOUT = V+/2 90 115 1.5 mA 4.0 mA AC Electrical Characteristics (10V) VV+ = 10V, VV- = 0V, VCM = 1.5V, VOUT = VV+/2; RL = 1M; TJ = 25C, bold values indicate -40C TJ +85C; Note 7; unless noted Symbol Parameter Condition Min Typ Max Units THD Total Harmonic Distortion f = 1kHz, AV = -2, RL = 2k, VOUT = 8.5 VPP 0.01 % SR Slew Rate V+ = 10V, Note 11 0.5 V/s V/s GBW Gain-Bandwidth Product 0.37 MHz m Phase Margin CL = 0pF 85 CL = 6000pF 40 10 dB Gm Gain Margin en Input-Referred Voltage Noise f = 1kHz, VCM = 1V 37 nV/ Hz in Input-Referred Current Noise f = 1kHz 1.5 fA/ Hz June 2005 5 MIC7300 MIC7300 Micrel Note 1. Exceeding the absolute maximum rating may damage the device. Note 2. The device is not guaranteed to function outside its operating rating. Note 3. I/O Pin Voltage is any external voltage to which an input or output is referenced. Note 4. The maximum allowable power dissipation is a function of the maximum junction temperature, TJ(max); the junction-to-ambient thermal resistance, JA; and the ambient temperature, TA. The maximum allowable power dissipation at any ambient temperature is calculated using: PD = (TJ(max) - TA) / JA. Exceeding the maximum allowable power dissipation will result in excessive die temperature. Note 5. Thermal resistance, JA, applies to a part soldered on a printed-circuit board. Note 6. Devices are ESD protected; however, handling precautions are recommended. Note 7. All limits guaranteed by testing or statistical analysis. Note 8. Continuous short circuit may exceed absolute maximum TJ under some conditions. Note 9. CMRR is determined as follows: The maximum VOS over the VCM range is divided by the magnitude of the VCM range. The measurement points are: VV-, (VV+ - VV-)/2, and VV+. Note 10. RL connected to 5V. Sourcing: 5V VOUT 10V. Sinking: 2.5V VOUT 5V. Note 11. Device connected as a voltage follower with a 10V step input. The value is the positive or negative slew rate, whichever is slower. MIC7300 6 June 2005 MIC7300 Micrel Typical Characteristics Input Current vs. Junction Temperature 10000 INPUT CURRENT (pA) TA = 25C 1000 100 10 1 -40 0 40 80 120 160 JUNCTION TEMPERATURE (C) CURRENT SINK / SOURCE (mA) Sink / Source Currents vs. Output Voltage 1000 TA = 25C 100 10 1 0.1 0.01 0.001 0.01 0.1 1 OUTPUT VOLTAGE (V) 10 Capacitive Load Capability vs. Supply Voltage LOAD CAPACITANCE (pF) 7000 5000 4000 3000 2000 1000 June 2005 TA = 25C 6000 2 4 6 8 SUPPLY VOLTAGE (V) 7 10 MIC7300 MIC7300 Micrel Output stage power (PO) is the product of the output stage voltage drop (VDROP) and the output (load) current (IOUT). Total on-chip power dissipation is: Application Information Input Common-Mode Voltage The MIC7300 tolerates input overdrive by at least 300mV beyond either rail without producing phase inversion. PD = PS + PO PD = VS IS + VDROP IOUT If the absolute maximum input voltage is exceeded, the input current should be limited to 5mA maximum to prevent reducing reliability. A 10k 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. where: PD = total on-chip power PS = supply power dissipation PO = output power dissipation VS = VV+ - VV- IS = power supply current RIN VDROP = VV+ - VOUT VOUT VDROP = VOUT - VV- VIN (sourcing current) (sinking current) 10k The above addresses only steady state (dc) conditions. For non-dc conditions the user must estimate power dissipation based on rms value of the signal. Figure 1. Input Current-Limit Protection Output Voltage Swing Sink and source output resistances of the MIC7300 are equal. Maximum output voltage swing is determined by the load and the approximate output resistance. The output resistance is: ROUT = The task is one of determining the allowable on-chip power dissipation for operation at a given ambient temperature and power supply voltage. From this determination, one may calculate the maximum allowable power dissipation and, after subtracting PS, determine the maximum allowable load current, which in turn can be used to determine the miniumum load impedance that may safely be driven. The calculation is summarized below. VDROP 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 high voltage using a 2k load (connected to V+/2) is 4.985V, which produces an ILOAD of: PD(max) = TJ(max) - TA JA JA(SOT-23-5) = 260C/W JA(MSOP-8) = 85C/W Driving Capacitive Loads 4.985V - 2.5V = 1.243mA . 2k 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 MIC7300 can typically drive a 2500pF capacitive load connected directly to the output when configured as a unity-gain amplifier and powered with a 2.2V supply. At 10V operation the circuit typically drives 6000pF. Phase margin is typically 40. Voltage drop in the amplifier output stage is: VDROP = 5.0V - 4.985V VDROP = 0.015V Because of output stage symmetry, the corresponding typical output low voltage (0.015V) also equals VDROP. Then: Using Large-Value Feedback Resistors 0.015V = 12 0.001243A Power Dissipation ROUT = The MIC7300 output drive capability requires considering power dissipation. If the load impedance is low, it is possible to damage the device by exceeding the 125C junction temperature rating. A large-value feedback resistor (> 500k) 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 feedback 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. On-chip power consists of two components: supply power and output stage power. Supply power (PS) is the product of the supply voltage (VS = VV+ - VV-) and supply current (IS). 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 MIC7300 8 June 2005 MIC7300 Micrel V+ 2.2V to 10V 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: VIN 0V to V+ RIN x CIN RFB x CFB MIC7300 5 3 1 VOUT 0V to V+ 4 2 CFB VOUT = VIN RFB Figure 4. Voltage Follower/Buffer RIN VIN VOUT VS 0.5V to Q1 VCEO(sus) CIN Figure 2. Cancelling Feedback Phase Lag 3 VIN 0V to 2V Since a significant percentage of CIN may be caused by board layout, it is important to note that the correct value of CFB may change when changing from a breadboard to the final circuit layout. 5 VOUT 0V to V+ Load V+ 2.2V to 10V MIC7300 IOUT 1 Q1 VCEO = 40V 2N3904 IC(max) = 200mA 4 { 2 RS 10 12W Change Q1 and RS for higher current and/or different gain. Typical Circuits Some single-supply, rail-to-rail applications for which the MIC7300 is well suited are shown in the circuit diagrams of Figures 3 through 7. IOUT = V+ 2.2V to 10V VIN = 100mA/V as shown RS Figure 5. Voltage-Controlled Current Sink R4 VIN 0V to V+ AV 3 5 MIC7300 1 4 2 100k V+ C1 0.001F VOUT 0V to V+ 5 4 MIC7300 1 R2 3 910k R1 100k V+ R2 R4 100k 100k Figure 3a. Noninverting Amplifier VOUT V+ 0V 2 R3 100k Figure 6. Square Wave Oscillator 100 V+ VOUT (V) CIN A V = 1+ R1 R2 33k 330k V+ R2 10 R1 5 4 MIC7300 COUT 1 0 3 0 VIN (V) 2 100 V+ Figure 3b. Noninverting Amplifier Behavior R3 330k RL R2 C1 1F VOUT 0V 330k = = -10 R4 A V = - R1 33k 330k Figure 7. AC-Coupled Inverting Amplifier June 2005 9 MIC7300 MIC7300 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) 3.02 (0.119) 2.80 (0.110) 0.50 (0.020) 0.35 (0.014) 1.30 (0.051) 0.90 (0.035) 0.20 (0.008) 0.09 (0.004) 10 0 0.15 (0.006) 0.00 (0.000) 0.60 (0.024) 0.10 (0.004) SOT-23-5 (M5) 0.122 (3.10) 0.112 (2.84) 0.199 (5.05) 0.187 (4.74) DIMENSIONS: INCH (MM) 0.120 (3.05) 0.116 (2.95) 0.036 (0.90) 0.032 (0.81) 0.043 (1.09) 0.038 (0.97) 0.012 (0.30) R 0.012 (0.03) 0.0256 (0.65) TYP 0.008 (0.20) 0.004 (0.10) 5 MAX 0 MIN 0.007 (0.18) 0.005 (0.13) 0.012 (0.03) R 0.039 (0.99) 0.035 (0.89) 0.021 (0.53) 8-Pin MSOP (MM) MIC7300 10 June 2005 MIC7300 June 2005 Micrel 11 MIC7300 MIC7300 Micrel MICREL INC. 2180 FORTUNE DRIVE TEL + 1 (408) 944-0800 FAX SAN JOSE, CA 95131 + 1 (408) 474-1000 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. (c) 2005 Micrel Incorporated MIC7300 12 June 2005