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
150µV of both rails when driving a 100kΩ 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, 2kΩ)
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/µs, respectively.
• Battery-powered instrumentation
• PCMCIA, USB peripherals
• Portable computers and PDAs
The MIC7300 is available in Micrel’s IttyBitty™ SOT-23-5
package for space-conscious circuits and in high-power
MM8™ 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
–40°C to +85°C
SOT-23-5
MIC7300BMM
MIC7300YMM
–40°C to +85°C
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) ...................................... +150°C
Storage Temperature ............................... –65°C to +150°C
Lead Temperature (soldering, 10 sec.) ..................... 260°C
ESD, Note 6
Supply Voltage (VV+ – VV–) .............................. 2.2V to 10V
Junction Temperature (TJ) ......................... –40°C to +85°C
Package Thermal Resistance, Note 5
SOT-23-5 (θJA) .................................................. 260°C/W
MSOP-8 (θJA) ...................................................... 85°C/W
Max. Power Dissipation ............................................ Note 4
DC Electrical Characteristics (2.2V)
VV+ = +2.2V, VV– = 0V, VCM = VOUT = VV+/2; RL = 1MΩ; TJ = 25°C, bold values indicate –40°C ≤ TJ ≤ +85°C; 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
µV/°C
IB
Input Bias Current
0.5
pA
IOS
Input Offset Current
0.25
pA
RIN
Input Resistance
>1
TΩ
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 = 600Ω
specified as VV+ – VOUT
33
110
165
mV
mV
output low, RL = 600Ω
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 = 1MΩ; TJ = 25°C, bold values indicate –40°C ≤ TJ ≤ +85°C; Note 7; unless noted
Symbol
Parameter
SR
Slew Rate
0.5
V/µs
GBW
Gain-Bandwidth Product
0.55
MHz
φm
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 = 1MΩ; TJ = 25°C, bold values indicate –40°C ≤ TJ ≤ +85°C; 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
µV/°C
IB
Input Bias Current
0.5
pA
IOS
Input Offset Current
0.25
pA
RIN
Input Resistance
>1
TΩ
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 = 600Ω
specified as VV+ – VOUT
33
110
165
mV
mV
output low, RL = 600Ω
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 = 1MΩ; TJ = 25°C, bold values indicate –40°C ≤ TJ ≤ +85°C; Note 7; unless noted
Symbol
Parameter
SR
Slew Rate
0.5
V/µs
GBW
Gain-Bandwidth Product
0.45
MHz
φm
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 = 1MΩ; TJ = 25°C, bold values indicate –40°C ≤ TJ ≤ +85°C; 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
µV/°C
IB
Input Bias Current
0.5
pA
IOS
Input Offset Current
0.25
pA
RIN
Input Resistance
>1
TΩ
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 = 600Ω
specified as VV+ – VOUT
50
165
250
mV
mV
output low, RL = 600Ω
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 = 1MΩ; TJ = 25°C, bold values indicate –40°C ≤ TJ ≤ +85°C; Note 7; unless noted
Symbol
Parameter
Condition
Min
THD
Total Harmonic Distortion
f = 1kHz, AV = –2,
RL = 2kΩ, VOUT = 4.0 VPP
SR
Typ
Max
Units
0.05
%
Slew Rate
0.5
V/µs
GBW
Gain-Bandwidth Product
0.4
MHz
φm
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 = 1MΩ; TJ = 25°C, bold values indicate –40°C ≤ TJ ≤ +85°C; 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
µV/°C
IB
Input Bias Current
0.5
pA
IOS
Input Offset Current
0.25
pA
RIN
Input Resistance
>1
TΩ
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 = 600Ω, 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 = 600Ω
specified as VV+ – VOUT
80
270
400
mV
mV
output low, RL = 600Ω
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 = 1MΩ; TJ = 25°C, bold values indicate –40°C ≤ TJ ≤ +85°C; 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/µs
V/µs
GBW
Gain-Bandwidth Product
0.37
MHz
φm
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, 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 5.
Thermal resistance, θJA, 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 = 25°C
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 = 25°C
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 = 25°C
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 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.
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)
10kΩ
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 2kΩ load (connected to V+/2) is 4.985V,
which produces an ILOAD of:
PD(max) =
TJ(max) − TA
θ JA
θJA(SOT-23-5) = 260°C/W
θJA(MSOP-8) = 85°C/W
Driving Capacitive Loads
4.985V − 2.5V
= 1.243mA .
2kΩ
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
= 12Ω
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 125°C junction
temperature rating.
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 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 × CIN ≤ RFB × 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
10Ω
1⁄2W
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
0.001µF
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
1µF
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.
© 2005 Micrel Incorporated
MIC7300
12
June 2005