LMC6442
Dual Micropower Rail-to-Rail Output Single Supply
Operational Amplifier
General Description
The LMC6442 is ideal for battery powered systems, where
very low supply current (less than one microamp per ampli-
fier) and Rail-to-Rail output swing is required. It is character-
ized for 2.2V to 10V operation, and at 2.2V supply, the
LMC6442 is ideal for single (Li-Ion) or two cell (NiCad or
alkaline) battery systems.
The LMC6442 is designed for battery powered systems that
require long service life through low supply current, such as
smoke and gas detectors, and pager or personal communi-
cations systems.
Operation from single supply is enhanced by the wide com-
mon mode input voltage range which includes the ground (or
negative supply) for ground sensing applications. Very low
(5fA, typical) input bias current and near constant supply
current over supply voltage enhance the LMC6442's perfor-
mance near the end-of-life battery voltage.
Designed for closed loop gains of greater than plus two (or
minus one), the amplifier has typically 9.5 KHz GBWP (Gain
Bandwidth Product). Unity gain can be used with a simple
compensation circuit, which also allows capacitive loads of
up to 300 pF to be driven, as described in the Application
Notes section.
For compact assembly the LMC6442 is available in the
MSOP 8 pin package, about one half the size required by the
SOIC 8 pin package. 8 pin DIP and 8 pin SOIC are also
available.
Features
(Typical, V
S
= 2.2V)
n
Output Swing to within 30 mV of supply rail
n
High voltage gain
103 dB
n
Gain Bandwidth Product
9.5 KHz
n
Guaranteed for:
2.2V, 5V, 10V
n
Low Supply Current
0.95 A/Amplifier
n
Input Voltage Range
-0.3V to V
+
-0.9V
n
2.1 W/Amplifier
Power consumption
n
Stable for A
V
+2 or A
V
-1
Applications
n
Portable instruments
n
Smoke/gas/CO/fire detectors
n
Pagers/cell phones
n
Instrumentation
n
Thermostats
n
Occupancy sensors
n
Cameras
n
Active badges
Connection Diagram
10006440
Top View
August 2000
LMC6442
Dual
Micropower
Rail-to-Rail
Output
Single
Supply
Operational
Amplifier
2004 National Semiconductor Corporation
DS100064
www.national.com
Absolute Maximum Ratings
(Note 1)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
ESD Tolerance (Note 2)
2 kV
Differential Input Voltage
Supply Voltages
Voltage at Input/Output Pin
(V
+
) + 0.3V, (V
-
) - 0.3V
Supply Voltage (V
+
- V
-
):
16V
Current at Input Pin (Note 10)
5 mA
Current at Output Pin(Notes 3, 7)
30 mA
Lead Temp. (soldering 10 sec)
260C
Storage Temp. Range:
-65C to +150C
Junction Temp. (Note 4)
150C
Operating Ratings
(Note 1)
Supply Voltage
1.8V
V
S
11V
Junction Temperature
-40C
<
T
J
<
+85C
Range: LMC6442AI, LMC6442I
Thermal Resistance (
JA
)
M Package, 8-pin Surface
Mount
193C/W
MSOP Package
235C/W
N Package, 8-pin Molded DIP
115C/W
2.2V Electrical Characteristics
Unless otherwise specified, all limits guaranteed for T
J
= 25C, V
+
= 2.2V, V
-
= 0V, V
CM
= V
O
= V
+
/2, and R
L
= 1 M
to V
+
/2.
Boldface limits apply at the temperature extremes.
Symbol
Parameter
Conditions
Typ
(Note 5)
LMC6442AI
Limit
(Note 6)
LMC6442I
Limit
(Note 6)
Units
DC Electrical Characteristics
V
OS
Input Offset Voltage
-0.75
3
4
7
8
mV
max
TCV
OS
Temp. coefficient of
input offset voltage
0.4
V/C
I
B
Input Bias Current
(Note 14)
0.005
4
4
pA
max
I
OS
Input Offset Current
(Note 14)
0.0025
2
2
pA
max
CMRR
Common Mode
Rejection Ratio
-0.1V
V
CM
0.5V
92
67
67
67
67
dB min
C
IN
Common Mode Input
Capacitance
4.7
pF
PSRR
Power Supply
Rejection Ratio
V
S
= 2.5 V to 10V
95
75
75
75
75
dB
min
V
CM
Input Common-Mode
Voltage Range
CMRR
50 dB
1.3
1.05
0.95
1.05
0.95
V
min
-0.3
-0.2
0
-0.2
0
V
max
A
V
Large Signal Voltage
Gain
Sourcing (Note 11)
100
dB
min
Sinking(Note 11)
94
V
O
= 0.22V to 2V
103
80
80
V
O
Output Swing
V
ID
= 100 mV (Note 13)
2.18
2.15
2.15
2.15
2.15
V
min
V
ID
= -100 mV (Note 13)
22
60
60
60
60
mV
max
I
SC
Output Short Circuit
Current
Sourcing, V
ID
= 100 mV
(Notes 12, 13)
50
18
17
18
17
A
min
Sinking, V
ID
= -100 mV
(Notes 12, 13)
50
20
19
20
19
I
S
Supply Current (2
amplifiers)
R
L
= open
1.90
2.4
3.0
2.6
3.2
A
max
V
+
= 1.8V, R
L
= open
2.10
AC Electrical Characteristics
SR
Slew Rate (Note 8)
2.2
V/ms
LMC6442
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2
2.2V Electrical Characteristics
(Continued)
Unless otherwise specified, all limits guaranteed for T
J
= 25C, V
+
= 2.2V, V
-
= 0V, V
CM
= V
O
= V
+
/2, and R
L
= 1 M
to V
+
/2.
Boldface limits apply at the temperature extremes.
Symbol
Parameter
Conditions
Typ
(Note 5)
LMC6442AI
Limit
(Note 6)
LMC6442I
Limit
(Note 6)
Units
GBWP
Gain-Bandwidth
Product
9.5
KHz
m
Phase Margin
(Note 15)
63
Degree
5V Electrical Characteristics
Unless otherwise specified, all limits guaranteed for T
J
= 25C, V
+
= 5V, V
-
= 0V, V
CM
= V
O
= V
+
/2, and R
L
= 1 M
to V
+
/2.
Boldface limits apply at the temperature extremes.
Symbol
Parameter
Conditions
Typ
(Note 5)
LMC6442AI
Limit
(Note 6)
LMC6442I
Limit
(Note 6)
Units
DC Electrical Characteristics
V
OS
Input Offset Voltage
-0.75
3
4
7
8
mV
max
TCV
OS
Temp. coefficient of
input offset voltage
0.4
V/C
I
B
Input Bias Current
(Note 14)
0.005
4
4
pA
max
I
OS
Input Offset Current
(Note 14)
0.0025
2
2
pA
max
CMRR
Common Mode
Rejection Ratio
-0.1V
V
CM
3.5V
102
70
70
70
70
dB
min
C
IN
Common Mode Input
Capacitance
4.1
pF
PSRR
Power Supply
Rejection Ratio
V
S
= 2.5 V to 10V
95
75
75
75
75
dB
min
V
CM
Input Common-Mode
Voltage Range
CMRR
50 dB
4.1
3.85
3.75
3.85
3.75
V
min
-0.4
-0.2
0
-0.2
0
V
max
A
V
Large Signal Voltage
Gain
Sourcing (Note 11)
100
dB
min
Sinking (Note 11)
94
V
O
= 0.5V to 4.5V
103
80
80
V
O
Output Swing
V
ID
= 100 mV
(Note 13)
4.99
4.95
4.95
4.95
4.95
V
min
V
ID
= -100 mV
(Note 13)
20
50
50
50
50
mV
max
I
SC
Output Short Circuit
Current
Sourcing, V
ID
= 100 mV
(Notes 12, 13)
500
300
200
300
200
A
min
Sinking, V
ID
= -100 mV
(Notes 12, 13)
350
200
150
200
150
I
S
Supply Current (2
amplifiers)
R
L
= open
1.90
2.4
3.0
2.6
3.2
A
max
AC Electrical Characteristics
SR
Slew Rate (Note 8)
4.1
2.5
2.5
V/ms
GBWP
Gain-Bandwidth
Product
10
KHz
m
Phase Margin
(Note 15)
64
Degree
LMC6442
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3
5V Electrical Characteristics
(Continued)
Unless otherwise specified, all limits guaranteed for T
J
= 25C, V
+
= 5V, V
-
= 0V, V
CM
= V
O
= V
+
/2, and R
L
= 1 M
to V
+
/2.
Boldface limits apply at the temperature extremes.
Symbol
Parameter
Conditions
Typ
(Note 5)
LMC6442AI
Limit
(Note 6)
LMC6442I
Limit
(Note 6)
Units
THD
Total Harmonic
Distortion
A
V
= +2, f = 100 Hz,
R
L
= 10M
, V
OUT
= 1 Vpp
0.08
%
10V Electrical Characteristics
Unless otherwise specified, all limits guaranteed for T
J
= 25C, V
+
= 10V, V
-
= 0V, V
CM
= V
O
= V
+
/2, and R
L
= 1 M
to V
+
/2.
Boldface limits apply at the temperature extremes.
Symbol
Parameter
Conditions
Typ
(Note 5)
LMC6442AI
Limit
(Note 6)
LMC6442I
Limit
(Note 6)
Units
DC Electrical Characteristics
V
OS
Input Offset Voltage
-1.5
3
4
7
8
mV
max
TCV
OS
Temp. coefficient of
input offset voltage
0.4
V/C
I
B
Input Bias Current
(Note 14)
0.005
4
4
pA
max
I
OS
Input Offset Current
(Note 14)
0.0025
2
2
pA
max
CMRR
Common Mode
Rejection Ratio
-0.1V
V
CM
8.5V
105
70
70
70
70
dB
min
C
IN
Common Mode Input
Capacitance
3.5
pF
PSRR
Power Supply
Rejection Ratio
V
S
= 2.5 V to 10V
95
75
75
75
75
dB
min
V
CM
Input Common-Mode
Voltage Range
CMRR
50 dB
9.1
8.85
8.75
8.85
8.75
V
min
-0.4
-0.2
0
-0.2
0
V
max
A
V
Large Signal Voltage
Gain
Sourcing (Note 11)
120
dB
min
Sinking (Note 11)
100
V
O
= 0.5V to 9.5V
104
80
80
V
O
Output Swing
V
ID
= 100 mV
(Note 13)
9.99
9.97
9.97
9.97
9.97
V
min
V
ID
= -100 mV(Note 13)
22
50
50
50
50
mV
max
I
SC
Output Short Circuit
Current
Sourcing, V
ID
= 100 mV
(Notes 12, 13)
2100
1200
1000
1200
1000
A
min
Sinking, V
ID
= -100 mV
(Notes 12, 13)
900
600
500
600
500
I
S
Supply Current (2
amplifiers)
R
L
= open
1.90
2.4
3.0
2.6
3.2
A
max
AC Electrical Characteristics
SR
Slew Rate(Note 8)
4.1
2.5
2.5
V/ms
GBWP
Gain-Bandwidth
Product
10.5
KHz
m
Phase Margin
(Note 15)
68
Degree
e
n
Input-Referred
Voltage Noise
R
L
= open
f = 10 Hz
170
nV/
Hz
LMC6442
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4
10V Electrical Characteristics
(Continued)
Unless otherwise specified, all limits guaranteed for T
J
= 25C, V
+
= 10V, V
-
= 0V, V
CM
= V
O
= V
+
/2, and R
L
= 1 M
to V
+
/2.
Boldface limits apply at the temperature extremes.
Symbol
Parameter
Conditions
Typ
(Note 5)
LMC6442AI
Limit
(Note 6)
LMC6442I
Limit
(Note 6)
Units
i
n
Input-Referred
Current Noise
R
L
= open
f = 10 Hz
0.0002
pA/
Hz
Crosstalk Rejection
(Note 9)
85
dB
Electrical Characteristics (continued)
Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is
intended to be functional, but specific performance is not guaranteed. For guaranteed specifications and the test conditions, see the Electrical Characteristics.
Note 2: Human body model, 1.5 k
in series with 100 pF.
Note 3: Applies to both single-supply and split-supply operation. Continuous short circuit operation at elevated ambient temperature can result in exceeding the
maximum allowed junction temperature of 150C. Output currents in excess of
30 mA over long term may adversely affect reliability.
Note 4: The maximum power dissipation is a function of T
J(max)
,
JA
, and T
A
. The maximum allowable power dissipation at any ambient temperature is P
D
= (T
J(max)
- T
A
)/
JA
. All numbers apply for packages soldered directly into a PC board.
Note 5: Typical Values represent the most likely parametric norm.
Note 6: All limits are guaranteed by testing or statistical analysis unless otherwise specified.
Note 7: Do not short circuit output to V
+
,when V
+
is greater than 13V or reliability will be adversely affected.
Note 8: Slew rate is the slower of the rising and falling slew rates.
Note 9: Input referred, V
+
= 10V and R
L
= 10 M
connected to 5V. Each amp excited in turn with 1 KHz to produce about 10 Vpp output.
Note 10: Limiting input pin current is only necessary for input voltages that exceed absolute maximum input voltage ratings.
Note 11: R
L
connected to V
+
/2. For Sourcing Test, V
O
>
V
+
/2. For Sinking tests, V
O
<
V
+
/2.
Note 12: Output shorted to ground for sourcing, and shorted to V+ for sinking short circuit current test.
Note 13: V
ID
is differential input voltage referenced to inverting input.
Note 14: Limits guaranteed by design.
Note 15: See the Typical Performance Characteristics and Application Notes sections for more details.
Typical Performance Characteristics
V
S
= 5V, Single Supply, T
A
= 25C unless otherwise
specified
Total Supply Current
vs Supply Voltage
Total Supply Current
vs Supply Voltage
(Negative Input Overdrive)
10006408
10006409
LMC6442
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5
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