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MIC7300
Micrel
MIC7300
High-Output Drive Rail-to-Rail Op Amp Preliminary Information
General Description
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. 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. 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.
Features
* * * * * * * 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
* Battery-powered instrumentation * PCMCIA, USB peripherals * Portable computers and PDAs
Pin Configurations
IN+
3
Ordering Information
Part Number
V- OUT
2 1
Temperature Range -40C to +85C -40C to +85C
Package SOT-23-5 MSOP-8
MIC7300BM5
Part Identification
MIC7300BMM
A17
4 5
IN-
V+
SOT-23-5 (M5)
Functional Configuration
IN+ V- OUT
V+ 1 IN- 2 IN+ 3 OUT 4
8 7 6 5
V- V- V- V-
3
2
1
4
5
IN-
V+
SOT-23-5 (M5) MSOP-8 (MM)
Pin Description
Pin Number SOT-23-5 1 2 3 4 5 Pin Number MSOP-8 4 5-8 3 2 1 Pin Name OUT V- IN+ IN- V+ Pin Function Amplifier Output Negative Supply: Negative supply for split supply application or ground for single supply application. Noninverting Input Inverting Input Positive Supply
IttyBitty and MM8 are trademarks 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
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Micrel
Absolute Maximum Ratings (Note 1)
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
Operating Ratings (Note 2)
Supply Voltage (VV+ - VV-) .............................. 2.2V to 10V Junction Temperature (TJ) ......................... -40C to +85C Max. Junction Temperature (TJ(max)), Note 4 ......... +125C 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 VOS TCVOS IB IOS RIN CMRR VCM PSRR CIN VO Parameter Input Offset Voltage Input Offset Voltage Average Drift Input Bias Current Input Offset Current Input Resistance Common-Mode Rejection Ratio Input Common-Mode Voltage 0V VCM 2.2V, Note 9 input low, CMRR 45dB input high, CMRR 45dB Power Supply Rejection Ratio Common-Mode Input Capacitance Output Swing output high, RL = 100k, specified as VV+ - VOUT output low, RL = 100k output high, RL = 2k specified as VV+ - VOUT output low, RL = 2k output high, RL = 600 specified as VV+ - VOUT output low, RL = 600 ISC IS Output Short Circuit Current Supply Current sinking or sourcing, Note 8 VOUT = V+/2 20 VV+ = VV- = 1.1V to 2.5V, VCM = 0 2.2 55 45 Condition Min Typ 1.0 1.0 0.5 0.25 >1 65 -0.3 2.5 75 3 0.15 0.15 10 10 33 33 40 0.7 2.0 1 1 1 1 33 50 33 50 110 165 110 165 0.0 Max 9 Units mV V/C pA pA T dB V V dB pF mV mV mV mV mV mV mV mV mV mV mV mV mA 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 SR GBW m Gm Parameter Slew Rate Gain-Bandwidth Product Phase Margin CL = 0pF CL = 2500pF Gain Margin Condition Min Typ 0.5 0.55 80 40 10 Max Units V/s MHz dB
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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 VOS TCVOS IB IOS RIN CMRR VCM PSRR CIN VOUT Parameter Input Offset Voltage Input Offset Voltage Average Drift Input Bias Current Input Offset Current Input Resistance Common-Mode Rejection Ratio Input Common-Mode Voltage 0V VCM 3.0V, Note 9 input low, CMRR 50dB input high, CMRR 50dB Power Supply Rejection Ratio Common-Mode Input Capacitance Output Swing output high, RL = 100k specified as VV+ - VOUT output low, RL = 100k output high, RL = 2k specified as VV+ - VOUT output low, RL = 2k output high, RL = 600 specified as VV+ - VOUT output low, RL = 600 ISC IS Output Short Circuit Current Supply Current sinking or sourcing, Note 8 60 VV+ = VV- = 1.5V to 5.0V, VCM = 0 3.0 55 50 Condition Min Typ 1.0 1.0 0.5 0.25 >1 70 -0.3 3.3 75 3 0.2 0.2 10 10 33 33 95 0.8 2.2 1 1 1 1 33 50 33 50 110 165 110 165 0 Max 9 Units mV V/C pA pA T dB V V dB pF mV mV mV mV mV mV mV mV mV mV mV mV mA 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 SR GBW m Gm Parameter Slew Rate Gain-Bandwidth Product Phase Margin CL = 0pF CL = 3500pF Gain Margin Condition Min Typ 0.5 0.45 85 40 10 Max Units V/s MHz dB
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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 VOS TCVOS IB IOS RIN CMRR VCM PSRR CIN VOUT Parameter Input Offset Voltage Input Offset Voltage Average Drift Input Bias Current Input Offset Current Input Resistance Common-Mode Rejection Ratio Input Common-Mode Voltage 0V VCM 5V, Note 9 input low, CMRR 55dB input high, CMRR 55dB Power Supply Rejection Ratio Common-Mode Input Capacitance Output Swing output high, RL = 100k specified as VV+ - VOUT output low, RL = 100k output high, RL = 2k specified as VV+ - VOUT output low, RL = 2k output high, RL = 600 specified as VV+ - VOUT output low, RL = 600 ISC IS Output Short Circuit Current Supply Current sinking or sourcing, Note 8 VOUT = V+/2 85 VV+ = VV- = 2.5V to 5.0V, VCM = 0 5.0 55 55 Condition Min Typ 1.0 1.0 0.5 0.25 >1 80 -0.3 5.3 75 3 0.3 0.3 15 15 50 50 105 1.0 2.8 1.0 1.5 1.0 1.5 50 75 50 75 165 250 165 250 -0.0 Max 9 Units mV V/C pA pA T dB V V dB pF mV mV mV mV mV mV mV mV mV mV mV mV mA 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 THD SR GBW m Gm Parameter Total Harmonic Distortion Slew Rate Gain-Bandwidth Product Phase Margin CL = 0pF CL = 4500pF Gain Margin Condition f = 1kHz, AV = -2, RL = 2k, VOUT = 4.0 VPP Min Typ 0.05 0.5 0.4 85 40 10 Max Units % V/s MHz dB
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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 VOS TCVOS IB IOS RIN CMRR VCM PSRR AV Parameter Input Offset Voltage Input Offset Voltage Average Drift Input Bias Current Input Offset Current Input Resistance Common-Mode Rejection Ratio Input Common-Mode Voltage 0V VCM 10V, Note 9 input low, V+ = 10V, CMRR 60dB input high, V+ = 10V, CMRR 60dB Power Supply Rejection Ratio Large Signal Voltage Gain VV+ = VV- = 2.5V to 5.0V, VCM = 0 sourcing or sinking, RL = 2k, Note 10 sourcing or sinking, RL = 600, Note 10 CIN VOUT Common-Mode Input Capacitance Output Swing output high, RL = 100k specified as VV+ - VOUT output low, RL = 100k output high, RL = 2k specified as VV+ - VOUT output low, RL = 2k output high, RL = 600 specified as VV+ - VOUT output low, RL = 600 ISC IS Output Short Circuit Current Supply Current sinking or sourcing, Notes 8 VOUT = V+/2 90 10.0 55 80 15 60 Condition Min Typ 1.0 1.0 0.5 0.25 >1 85 -0.3 10.3 75 340 300 3 0.5 0.5 24 24 80 80 115 1.5 4.0 1.5 2.5 1.5 2.5 80 120 80 120 270 400 270 400 -0.0 Max 9 Units mV V/C pA pA T dB V V dB V/mV V/mV pF mV mV mV mV mV mV mV mV mV mV mV mV mA 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 THD SR GBW m Gm en in Parameter Total Harmonic Distortion Slew Rate Gain-Bandwidth Product Phase Margin CL = 0pF CL = 6000pF Gain Margin Input-Referred Voltage Noise Input-Referred Current Noise f = 1kHz, VCM = 1V f = 1kHz Condition f = 1kHz, AV = -2, RL = 2k, VOUT = 8.5 VPP V+ = 10V, Note 11 Min Typ 0.01 0.5 0.37 85 40 10 37 1.5 Max Units % V/s V/s MHz dB
nV/ Hz fA/ Hz
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Note 1. Note 2. Note 3. Note 4. Exceeding the absolute maximum rating may damage the device. The device is not guaranteed to function outside its operating rating. I/O Pin Voltage is any external voltage to which an input or output is referenced.
Micrel
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. Thermal resistance, JA, applies to a part soldered on a printed-circuit board. Devices are ESD protected; however, handling precautions are recommended. All limits guaranteed by testing or statistical analysis. Continuous short circuit may exceed absolute maximum TJ under some conditions. 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 5. Note 6. Note 7. Note 8. Note 9.
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.
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Typical Characteristics
Input Current vs. Junction Temperature
TA = 25C INPUT CURRENT (pA) 1000
10000
100
10
1 -40 0 40 80 120 160 JUNCTION TEMPERATURE (C)
Sink / Source Currents vs. Output Voltage
CURRENT SINK / SOURCE (mA) 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
7000 LOAD CAPACITANCE (pF) 6000 5000 4000 3000 2000 1000 2 4 6 8 SUPPLY VOLTAGE (V) 10 TA = 25C
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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: PD = PS + PO PD = VS IS + VDROP IOUT where: PD = total on-chip power PS = supply power dissipation PO = output power dissipation VS = VV+ - VV- IS = power supply current VDROP = VV+ - VOUT (sourcing current) VDROP = VOUT - VV-
Application Information
Input Common-Mode Voltage The MIC7300 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 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.
RIN VIN 10k
VOUT
(sinking current)
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 =
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: 4.985V - 2.5V = 1.243mA . 2k 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: 0.015V = 12 0.001243A Power Dissipation 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. 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). ROUT =
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. 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.
PD(max) = TJ(max) - TA JA
JA(SOT-23-5) = 260C/W JA(MSOP-8) = 85C/W 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 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. Using Large-Value Feedback Resistors 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. 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
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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:
V+ 2.2V to 10V VIN 0V to V+
3 5
Micrel
MIC7300
1
RIN x CIN RFB x CFB
CFB RFB RIN VOUT CIN
4 2
VOUT 0V to V+ VOUT = VIN
Figure 4. Voltage Follower/Buffer
VS 0.5V to Q1 VCEO(sus)
Load
VIN
V+ 2.2V to 10V
VOUT 0V to V+
Figure 2. Cancelling Feedback Phase Lag 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. 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.
V+ 2.2V to 10V VIN
3 5
VIN 0V to 2V
3
5
MIC7300
1
IOUT Q1 VCEO = 40V 2N3904 IC(max) = 200mA
4 2
{
Change Q1 and RS for higher current and/or different gain.
RS 10 12W
V IOUT = IN = 100mA/V as shown RS
Figure 5. Voltage-Controlled Current Sink
R4 C1 0.001F
4
MIC7300
1
0V to
V+ AV
4 2
VOUT 0V to V+
100k V+
5
MIC7300
1
R2
3
VOUT
V+ 0V
R1 100k
910k
R2 100k R3 100k
2
V+
R4 100k
Figure 3a. Noninverting Amplifier
100 V+
Figure 6. Square Wave Oscillator
CIN R1 33k
A V = 1+ R2 10 R1
4
VOUT (V)
R2 330k V+
5
MIC7300
1
COUT RL
VOUT
0V
0
3
0
VIN (V)
100
2
Figure 3b. Noninverting Amplifier Behavior
V+
R3 330k C1 1F
= = -10 R4 A V = - R1 33k 330k
R2
330k
Figure 7. AC-Coupled Inverting Amplifier
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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) 1.30 (0.051) 0.90 (0.035) 10 0 0.15 (0.006) 0.00 (0.000) 0.20 (0.008) 0.09 (0.004)
0.50 (0.020) 0.35 (0.014)
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
0.007 (0.18) 0.005 (0.13)
0.012 (0.03) 0.0256 (0.65) TYP
0.008 (0.20) 0.004 (0.10)
5 MAX 0 MIN
0.012 (0.03) R 0.039 (0.99) 0.035 (0.89) 0.021 (0.53)
8-Pin MSOP (MM)
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MICREL INC. 1849 FORTUNE DRIVE SAN JOSE, CA 95131
TEL
USA
+ 1 (408) 944-0800
FAX
+ 1 (408) 944-0970
WEB
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) 1999 Micrel Incorporated
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