2004 Microchip Technology Inc.
DS21881A-page 1
MCP6231
Features
Gain Bandwidth Product: 300 kHz (typ.)
Supply Current: I
Q
= 20 A (typ.)
Supply Voltage: 1.8V to 5.5V
Rail-to-Rail Input/Output
Extended Temperature Range: -40C to +125C
Available in 5-Pin SC-70 and SOT-23 packages
Applications
Automotive
Portable Equipment
Transimpedance amplifiers
Analog Filters
Notebooks and PDAs
Battery-Powered Systems
Available Tools
Spice Macro Models (at www.microchip.com)
FilterLab
Software (at www.microchip.com)
Typical Application
Description
The Microchip Technology Inc. MCP6231 operational
amplifier (op amp) provides wide bandwidth for the
quiescent current. The MCP6231 has a 300 kHz Gain
Bandwidth Product (GBWP) and 65 (typ.) phase
margin. This op amp operates from a single supply
voltage as low as 1.8V, while drawing 20 A (typ.)
quiescent current. In addition, the MCP6231 supports
rail-to-rail input and output swing, with a common mode
input voltage range of V
DD
+ 300 mV to V
SS
- 300 mV.
This op amp is designed in one of Microchip's
advanced CMOS processes.
The MCP6231 operates in the Extended temperature
range of -40C to +125C. It has a power supply range
of 1.8V to 5.5V.
Package Types
MCP6231
V
OUT
V
IN2
+
V
IN1
R
g2
R
g1
R
f
R
z
V
DD
R
x
R
y
Summing Amplifier Circuit
4
MCP6231
1
2
3
+
5 V
DD
V
IN
V
OUT
V
SS
V
IN
+
SOT-23-5
4
1
2
3
+
5 V
DD
V
OUT
V
SS
MCP6231R
SOT-23-5
4
1
2
3
+
5 V
SS
V
IN
V
OUT
V
DD
V
IN
+
MCP6231U
SC-70-5, SOT-23-5
4
1
2
3
+
5 V
DD
V
OUT
V
IN
+
V
SS
V
IN
V
IN
+
V
IN
MCP6231
V
SS
V
DD
V
OUT
1
2
3
4
8
7
6
5
+
NC
NC
NC
PDIP, SOIC, MSOP
20 A, 300 kHz Rail-to-Rail Op Amp
MCP6231
DS21881A-page 2
2004 Microchip Technology Inc.
1.0
ELECTRICAL
CHARACTERISTICS
Absolute Maximum Ratings
V
DD
- V
SS
.........................................................................7.0V
All Inputs and Outputs ................... V
SS
0.3V to V
DD
+ 0.3V
Difference Input Voltage ...................................... |V
DD
V
SS
|
Output Short Circuit Current ..................................continuous
Current at Input Pins ....................................................2 mA
Current at Output and Supply Pins ............................30 mA
Storage Temperature.................................... 65C to +150C
Maximum Junction Temperature (T
J
) .......................... +150C
ESD Protection On All Pins (HBM;MM)
...............
4 kV; 400V
Notice: Stresses above those listed under "Maximum
Ratings" may cause permanent damage to the device. This is
a stress rating only and functional operation of the device at
those or any other conditions above those indicated in the
operational listings of this specification is not implied.
Exposure to maximum rating conditions for extended periods
may affect device reliability.
PIN FUNCTION TABLE
DC ELECTRICAL SPECIFICATIONS
Name
Function
V
IN
+
Non-inverting Input
V
IN
Inverting Input
V
DD
Positive Power Supply
V
SS
Negative Power Supply
V
OUT
Output
Electrical Characteristics: Unless otherwise indicated, T
A
= +25C, V
DD
= +1.8V to +5.5V, V
SS
= GND, V
CM
= V
DD
/2, R
L
= 100 k
to V
DD
/2 and V
OUT
V
DD
/2.
Parameters
Sym
Min
Typ
Max
Units
Conditions
Input Offset
Input Offset Voltage
V
OS
5.0
--
+5.0
mV
V
CM
= V
SS
Extended Temperature
V
OS
7.0
--
+7.0
mV
T
A
= 40C to +125C (Note)
Input Offset Drift with Temperature
V
OS
/
T
A
--
3.0
--
V/C
T
A
= 40C to +125C,
V
CM
= V
SS
Power Supply Rejection
PSRR
--
83
--
dB
V
CM
= V
SS
Input Bias Current and Impedance
Input Bias Current:
I
B
--
1.0
--
pA
At Temperature
I
B
--
20
--
pA
T
A
= +85C
At Temperature
I
B
--
1100
--
pA
T
A
= +125C
Input Offset Current
I
OS
--
1.0
--
pA
Common Mode Input Impedance
Z
CM
--
10
13
||6
--
||pF
Differential Input Impedance
Z
DIFF
--
10
13
||3
--
||pF
Common Mode
Common Mode Input Range
V
CMR
V
SS
0.3
--
V
DD
+ 0.3
V
Common Mode Rejection Ratio
CMRR
61
75
--
dB
V
CM
= 0.3V to 5.3V, V
DD
= 5V
Open-Loop Gain
DC Open-Loop Gain (large signal)
A
OL
90
110
--
dB
V
OUT
= 0.3V to V
DD
- 0.3V,
V
CM
= V
SS
Output
Maximum Output Voltage Swing
V
OL
, V
OH
V
SS
+
35
--
V
DD
35
mV
R
L
= 10 k
Output Short-Circuit Current
I
SC
--
6
--
mA
V
DD
= 1.8V
I
SC
--
23
--
mA
V
DD
= 5.5V
Power Supply
Supply Voltage
V
DD
1.8
--
5.5
V
Quiescent Current per Amplifier
I
Q
10
20
30
A
I
O
= 0, V
CM
= V
DD
0.5V
Note:
The SC70 package is only tested at 25C.
2004 Microchip Technology Inc.
DS21881A-page 3
MCP6231
AC ELECTRICAL SPECIFICATIONS
TEMPERATURE SPECIFICATIONS
Electrical Characteristics: Unless otherwise indicated, T
A
= +25C, V
DD
= +1.8 to 5.5V, V
SS
= GND, V
CM
= V
DD
/2,
V
OUT
V
DD
/2, R
L
= 100 k
to V
DD
/2 and C
L
= 60 pF.
Parameters
Sym
Min
Typ
Max
Units
Conditions
AC Response
Gain Bandwidth Product
GBWP
--
300
--
kHz
Phase Margin
PM
--
65
--
G = +1
Slew Rate
SR
--
0.10
--
V/s
Noise
Input Noise Voltage
E
ni
--
6.0
--
Vp-p
f = 0.1 Hz to 10 Hz
Input Noise Voltage Density
e
ni
--
52
--
nV/
Hz
f = 1 kHz
Input Noise Current Density
i
ni
--
0.6
--
fA/
Hz
f = 1 kHz
Electrical Characteristics: Unless otherwise indicated, V
DD
= +1.8V to +5.5V and V
SS
= GND.
Parameters
Sym
Min
Typ
Max
Units
Conditions
Temperature Ranges
Extended Temperature Range
T
A
40
--
+125
C
Operating Temperature Range
T
A
40
--
+125
C
Note
Storage Temperature Range
T
A
65
--
+150
C
Thermal Package Resistances
Thermal Resistance, 5L-SC70
JA
--
331
--
C/W
Thermal Resistance, 5L-SOT-23
JA
--
256
--
C/W
Thermal Resistance, 8L-PDIP
JA
--
85
--
C/W
Thermal Resistance, 8L-SOIC
JA
--
163
--
C/W
Thermal Resistance, 8L-MSOP
JA
--
206
--
C/W
Note:
The internal Junction Temperature (T
J
) must not exceed the Absolute Maximum specification of +150C.
MCP6231
DS21881A-page 4
2004 Microchip Technology Inc.
2.0
TYPICAL PERFORMANCE CURVES
Note: Unless otherwise indicated, T
A
= +25C, V
DD
= +1.8V to +5.5V, V
SS
= GND, V
CM
= V
DD
/2, V
OUT
V
DD
/2,
R
L
= 100 k
to V
DD
/2 and C
L
= 60 pF.
FIGURE 2-1:
Input Offset Voltage.
FIGURE 2-2:
PSRR, CMRR vs.
Frequency.
FIGURE 2-3:
Input Bias Current at +85C.
FIGURE 2-4:
CMRR, PSRR vs. Ambient
Temperature.
FIGURE 2-5:
Open-Loop Gain, Phase vs.
Frequency.
FIGURE 2-6:
Input Bias Current at +125C.
Note:
The graphs and tables provided following this note are a statistical summary based on a limited number of
samples and are provided for informational purposes only. The performance characteristics listed herein
are not tested or guaranteed. In some graphs or tables, the data presented may be outside the specified
operating range (e.g., outside specified power supply range) and therefore outside the warranted range.
0%
2%
4%
6%
8%
10%
12%
14%
16%
18%
20%
-5
-4
-3
-2
-1
0
1
2
3
4
5
Input Offset Voltage (mV)
P
e
r
cent
a
ge of
O
ccur
r
e
nces
630 Samples
V
CM
= V
SS
20
30
40
50
60
70
80
90
100
1.E+01
1.E+02
1.E+03
1.E+04
1.E+05
Frequency (Hz)
PS
RR, CM
RR (
d
B)
10
1k
10k
100k
100
V
DD
= 5.0V
PSRR+
PSRR-
CMRR
0%
2%
4%
6%
8%
10%
12%
14%
16%
18%
20%
22%
0
6
12
18
24
30
36
42
Input Bias Current (pA)
P
e
r
centage of Occur
r
e
nces
630 Samples
V
CM
= V
SS
T
A
= +85C
70
75
80
85
90
-40
-20
0
20
40
60
80
100
120
Ambient Temperature (C)
CMRR,
PSRR (
d
B)
PSRR (V
CM
= V
SS
)
CMRR (V
CM
= -0.3 V to +5.3 V)
V
DD
= 5.0V
-20
0
20
40
60
80
100
120
1.E-01
1.E+00
1.E+01
1.E+02
1.E+03
1.E+04
1.E+05
1.E+06
1.E+07
Frequency (Hz)
O
p
en
-L
o
o
p
Gain
(
d
B)
-210
-180
-150
-120
-90
-60
-30
0
O
p
en-
L
o
o
p P
h
ase
(
)
R
L
= 100.0 k
V
DD
= 5.0V
V
CM
= V
DD
/2
0.1
1
10 100
1k 10k 100k 1M 10M
Gain
Phase
0%
5%
10%
15%
20%
25%
30%
0.0
0.2
0.3
0.5
0.6
0.8
0.9
1.1
1.2
1.4
1.5
1.7
1.8
2.0
Input Bias Current (nA)
P
e
r
centage of Occur
r
e
nces
632 Samples
V
CM
= V
SS
T
A
= +125C
2004 Microchip Technology Inc.
DS21881A-page 5
MCP6231
Note: Unless otherwise indicated, T
A
= +25C, V
DD
= +1.8V to +5.5V, V
SS
= GND, V
CM
= V
DD
/2, V
OUT
V
DD
/2,
R
L
= 100 k
to V
DD
/2 and C
L
= 60 pF.
FIGURE 2-7:
Input Noise Voltage Density
vs. Frequency.
FIGURE 2-8:
Input Offset Voltage vs.
Common Mode Input Voltage at V
DD
= 1.8V.
FIGURE 2-9:
Input Offset Voltage vs.
Common Mode Input Voltage at V
DD
= 5.5V.
FIGURE 2-10:
Input Offset Voltage Drift.
FIGURE 2-11:
Input Offset Voltage vs.
Output Voltage.
FIGURE 2-12:
Output Short-Circuit Current
vs. Ambient Temperature.
10
100
1,000
1.E-01
1.E+00
1.E+01
1.E+02
1.E+03
1.E+04
1.E+05
Frequency (Hz)
In
p
u
t
No
is
e V
o
lt
ag
e
D
e
n
s
it
y
(n
V
/
Hz)
0.1
100
1k
10k
100k
10
1
150
250
350
450
550
-0.4
-0.2
0.0
0.2
0.4
0.6
0.8
1.0
1.2
1.4
1.6
1.8
2.0
2.2
Common Mode Input Voltage (V)
I
nput O
ffset V
o
l
t
age (
V
)
V
DD
= 1.8 V
T
A
= +125C
T
A
= +85C
T
A
= +25C
T
A
= -40C
-300
-200
-100
0
100
200
300
-0.5
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
4.5
5.0
5.5
6.0
Common Mode Input Voltage (V)
I
nput O
ffset V
o
l
t
age (
V
)
V
DD
= 5.5 V
T
A
= +125C
T
A
= +85C
T
A
= +25C
T
A
= -40C
0%
2%
4%
6%
8%
10%
12%
14%
16%
18%
20%
-1
2
-1
0
-8
-6
-4
-2
0
2
4
6
8
10
12
Input Offset Voltage Drift (V/C)
P
e
r
cen
t
a
g
e
o
f
O
ccu
r
r
e
n
ces
628 Samples
V
CM
= V
SS
T
A
= -40C to +125C
-300
-250
-200
-150
-100
-50
0
50
100
0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5
Output Voltage (V)
I
nput O
ffset V
o
l
t
age (
V
)
V
DD
= 1.8 V
V
CM
= V
SS
V
DD
= 5.5 V
-30
-20
-10
0
10
20
30
-50
-25
0
25
50
75
100
125
Ambient Temperature (C)
O
u
t
put
S
hor
t
C
i
r
c
ui
t
C
u
r
r
e
nt
(mA)
-I
SC
, V
DD
= 1.8 V
+I
SC
, V
DD
= 1.8 V
+I
SC
, V
DD
= 5.5 V
-I
SC
, V
DD
= 5.5 V
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