LTC1541/LTC1542
Micropower Op Amp,
Comparator and Reference
FEATURES
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DESCRIPTION
The LTC
®
1541/LTC1542 combine a micropower ampli-
fier, comparator and bandgap reference (LTC1541) in an
8-pin package. The part operates from a single 2.5V to
12.6V or dual
±1.25V
to
±6.3V
supply with a typical supply
current of 5µA. Both the op amp and comparator feature
a common mode input voltage range that extends from the
negative supply to within 1.3V of the positive supply. The
op amp output stage swings from rail-to-rail. The
comparator’s inverting input is internally connected to the
reference output (LTC1541).
The reference output voltage is 1.2V
±1%
over the
extended temperature range. The output can drive a
bypass capacitor of up to 0.01µF without any oscillations.
It can also source up to 2mA and sink up to 20µA.
The op amp is internally compensated to be unity-gain
stable with typical GBW at 12kHz and slew rate of 8V/ms.
The comparator has
±3mV
of internal hysteresis to ensure
clean output switching, even with slow moving input
signals.
The LTC1541/LTC1542 are available in MSOP and SO-8
packages.
, LTC and LT are registered trademarks of Linear Technology Corporation.
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Quiescent Current: 5
µ
A Typ
Outputs Swing Rail-to-Rail
Low Op Amp Offset Voltage: 700
µ
V Max
Reference Output Drives 0.01µF Capacitor
Internal 1.2V
±0.4%
Reference Output (LTC1541)
Low Input Bias Current: 1nA Max
Reference Output Can Source Up to 2mA
Internal
±3mV
Comparator Hysteresis
Comparator and Op Amp Input Range
Includes Ground
Op Amp Capable of Driving Up to 1000pF Load
Unity-Gain Stable and 12kHz Bandwidth
2.5V to 12.6V Supply Voltage Range
Outputs
Daisy-Chained Control
Pin Compatible Upgrade for MAX951/MAX953
APPLICATIONS
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Battery- or Solar-Powered Systems
Automotive Keyless Entry
Low Frequency, Local Area Alarms/Detectors
Infrared Receivers for Remote Controls
Smoke Detectors and Safety Sensors
GSM Portable Phones
TYPICAL APPLICATION
Pilot Light Flame Detector with Low-Battery Lockout
V
IN
= 3.6V TO 9V
1N457
TYPE R
1k
100k
1N457
10M
3
10k
2.2µF 1/2 LTC1541
2
2N3904
SCR LOAD
–
PERCENT OF UNITS (%)
–
+
+
8
1
OUTPUT HIGH = “ON”
OUTPUT LOW = “OFF”
I
CC
= 7µA AT V
IN
= 5V
2M
5
1M
6
2M
1.2V INTERNAL
REFERENCE
1541/42 • TA01
+
1/2 LTC1541
7
LOW BATTERY
–
10k
VN2222
U
U
U
Op Amp V
OS
Distribution,
V
CM
= 2.5V, SO-8 Package
Total of 839 Units
50
V
CC
= 5V
V
SS
= 0V
40
30
20
10
0
–600
0
300
–300
INPUT OFFSET VOLTAGE (µV)
600
1541/42 TA02
1
LTC1541/LTC1542
ABSOLUTE
MAXIMUM
RATINGS
Supply Voltage ........................................................ 13V
Input Voltage .............................................– 0.3V to 13V
Output Voltage ...........................................– 0.3V to 13V
Output Short-Circuit Duration .......................... Indefinite
Storage Temperature Range ................. – 65°C to 150°C
Operating Temperature Range
Commercial ............................................. 0°C to 70°C
Industrial ............................................ – 40°C to 85°C
Lead Temperature (Soldering, 10 sec).................. 300°C
PACKAGE/ORDER I FOR ATIO
TOP VIEW
AMPOUT
AMPIN
–
AMPIN
+
V
SS
1
2
3
4
8
7
6
5
V
CC
COMPOUT
REF
COMPIN
+
ORDER PART
NUMBER
LTC1541CMS8
MS8 PART MARKING
LTBE
MS8 PACKAGE
8-LEAD PLASTIC MSOP
T
JMAX
= 125°C,
θ
JA
= 250°C/W
TOP VIEW
AMPOUT
AMPIN
–
AMPIN
+
V
SS
1
2
3
4
8
7
6
5
V
CC
COMPOUT
COMPIN
–
COMPIN
+
ORDER PART
NUMBER
LTC1542CMS8
MS8 PART MARKING
LTDE
MS8 PACKAGE
8-LEAD PLASTIC MSOP
T
JMAX
= 125°C,
θ
JA
= 250°C/W
Consult factory for Military grade parts.
ELECTRICAL CHARACTERISTICS
SYMBOL
Power Supply
V
CC
I
CC
Supply Voltage Range
Supply Current (Note 1)
PARAMETER
CONDITIONS
V
CC
= 5V, V
SS
= 0V, T
A
= 25°C, unless otherwise noted.
MIN
q
Commercial Grade
Industrial Grade
Comparator
V
OS
Input Offset Voltage (Note 2)
(SO-8)
Commercial Grade (SO-8)
Industrial Grade (SO-8)
(MSOP)
V
TRIP
Trip Point (Note 3)
q
2
U
U
W
W W
U
W
TOP VIEW
AMPOUT 1
AMPIN
–
2
AMPIN
+
3
8
7
6
5
V
CC
COMPOUT
REF
COMPIN
+
ORDER PART
NUMBER
LTC1541CS8
LTC1541IS8
S8 PART MARKING
1541
1541I
ORDER PART
NUMBER
LTC1542CS8
LTC1542IS8
S8 PART MARKING
1542
1542I
V
SS
4
S8 PACKAGE
8-LEAD PLASTIC SO
T
JMAX
= 125°C,
θ
JA
= 150°C/W
TOP VIEW
AMPOUT 1
AMPIN
–
AMPIN
+
2
3
8
7
6
5
V
CC
COMPOUT
COMPIN
–
COMPIN
+
V
SS
4
S8 PACKAGE
8-LEAD PLASTIC SO
T
JMAX
= 125°C,
θ
JA
= 150°C/W
TYP
MAX
12.6
UNITS
V
µA
µA
µA
mV
mV
mV
mV
mV
mV
mV
2.5
5
q
q
7.5
13
14
1
1.5
2.0
1.2
2.0
q
q
q
1.7
1
2.25
2.8
3.8
LTC1541/LTC1542
ELECTRICAL CHARACTERISTICS
SYMBOL
I
IN
V
CM
CMRR
PARAMETER
Input Leakage Current (Note 4)
Input Common Mode Range
Common Mode Rejection Ratio
CONDITIONS
V
CC
= 5V, V
SS
= 0V, T
A
= 25°C, unless otherwise noted.
MIN
q
q
TYP
0.01
MAX
1
V
CC
– 1.3V
0.25
0.30
0.35
0.25
0.30
0.35
UNITS
nA
V
mV/V
mV/V
mV/V
mV/V
mV/V
mV/V
µs
µs
V
V
SS
V
CM
= V
SS
to (V
CC
– 1.3V) (LTC1542)
Commercial Grade
Industrial Grade
V
CC
= 3V to 12V
Commercial Grade (SO-8)
Industrial Grade (SO-8)
Overdrive = 10mV
Overdrive = 100mV
I
OUT
= – 2mA
I
OUT
= 1.8mA
No Load (SO-8)
Commercial Grade (SO-8)
Industrial Grade (SO-8)
No Load (MSOP)
q
q
q
q
PSRR
Power Supply Rejection Ratio
t
PD
V
OH
V
OL
V
REF
Propagation Delay
Output High Voltage
Output Low Voltage
Reference Voltage
20
8
q
V
CC
– 0.2V
q
V
SS
+ 0.3V
1.195
1.190
1.188
1.190
1.185
1.200
1.205
1.210
1.212
1.210
1.215
6
1.5
5
V
V
V
V
V
V
mV
mV
mV
µV
P-P
Reference (LTC1541 Only)
q
q
q
1.200
2
0.2
16
∆V
REF
Load Regulation
I
SOURCE
= 2mA
I
SINK
= 10µA
0.1Hz to 10Hz
V
CM
= 2.5V (SO-8)
Commercial Grade (SO-8)
Industrial Grade (SO-8)
V
CM
= 2.5V (MSOP)
q
q
e
n
Op Amp
V
OS
Voltage Noise
Input Offset Voltage
q
q
q
0.7
1.25
1.65
1.00
1.75
0.01
80
60
38
35
1000
500
1
mV
mV
mV
mV
mV
nA
V/mV
V/mV
V/mV
V/mV
kHz
V/ms
I
B
A
VOL
Input Bias Current
Large-Signal Gain
V
CM
= 2.5V
AMPOUT = 0.5V to 4.5V, No Load
AMPOUT = 0.5V to 4.5V, R
LOAD
= 100k
Commercial Grade
Industrial Grade
A
V
= 1V/V
A
V
= 1V/V
q
q
q
GBW
SR
V
CM
CMRR
Gain Bandwidth
Slew Rate
Input Common Mode Range
Common Mode Rejection Ratio
12
8
q
V
SS
V
CC
– 1.3V
0.28
0.33
0.38
0.19
0.21
0.23
V
mV/V
mV/V
mV/V
mV/V
mV/V
mV/V
V
V
V
V
CM
= V
SS
to (V
CC
– 1.3V)
Commercial Grade
Industrial Grade
V
CC
= 3V to 12V
Commercial Grade
Industrial Grade
R
LOAD
= 100k to V
SS
Commercial Grade
Industrial Grade
R
LOAD
= 100k to V
SS
Commercial Grade
Industrial Grade
q
q
q
q
PSRR
Power Supply Rejection Ratio
V
OH
Output High Voltage
V
CC
– 0.07
q
V
CC
– 0.10
q
V
CC
– 0.12
q
q
V
OL
Output Low Voltage
V
SS
+ 0.05
V
SS
+ 0.10
V
SS
+ 0.12
V
V
V
3
LTC1541/LTC1542
ELECTRICAL CHARACTERISTICS
SYMBOL
I
SOURCE
I
SINK
e
n
PARAMETER
Output Source Current
q
V
CC
= 5V, V
SS
= 0V, T
A
= 25°C, unless otherwise noted.
MIN
0.9
0.7
1.3
0.9
TYP
1.8
1.8
3
MAX
UNITS
mA
mA
mA
mA
µV
P-P
CONDITIONS
Output Sink Current
q
Input Noise Voltage
f
O
= 0.1Hz to 10Hz
V
CC
= 3V, V
SS
= 0V, T
A
= 25°C, unless otherwise noted.
SYMBOL
Power Supply
V
CC
I
CC
Supply Voltage Range
Supply Current (Note 1)
Commercial Grade
Industrial Grade
Comparator
V
OS
Input Offset Voltage (Note 2)
(SO-8)
Commercial Grade (SO-8)
Industrial Grade (SO-8)
(MSOP)
q
q
q
q
q
q
PARAMETER
CONDITIONS
MIN
2.5
TYP
MAX
12.6
UNITS
V
µA
µA
µA
mV
mV
mV
mV
mV
mV
mV
nA
V
mV/V
mV/V
mV/V
mV/V
mV/V
mV/V
µs
µs
V
4.5
7.0
12
13
1.0
1.5
2.0
1.2
2.0
V
TRIP
I
IN
V
CM
CMRR
Trip Point (Note 3)
q
1.80
1.00
V
SS
2.35
0.01
2.90
3.90
1
V
CC
– 1.3
0.35
0.40
0.45
0.25
0.30
0.35
Input Leakage Current (Note 4)
Input Common Mode Range
Common Mode Rejection Ratio
V
CM
= V
SS
to (V
CC
– 1.3V) (LTC1542)
Commercial Grade
Industrial Grade
V
CC
= 3V to 12V
Commercial Grade
Industrial Grade
Overdrive = 10mV
Overdrive = 100mV
I
OUT
= – 2mA
I
OUT
= 1.8mA
No Load (SO-8)
Commercial Grade (SO-8)
Industrial Grade (SO-8)
No Load (MSOP)
q
q
q
q
q
q
PSRR
Power Supply Rejection Ratio
t
PD
V
OH
V
OL
V
REF
Propagation Delay
Output High Voltage
Output Low Voltage
Reference Voltage
25
12
q
q
V
CC
– 0.2
V
SS
+ 0.3
1.195
1.190
1.188
1.190
1.185
1.200
1.205
1.210
1.212
1.210
1.215
6
1.5
5
V
V
V
V
V
V
mV
mV
mV
µV
P-P
Reference (LTC1541 Only)
q
q
q
1.200
2
0.2
16
∆V
REF
Load Regulation
I
SOURCE
= 1mA
I
SINK
= 10µA
0.1Hz to 10Hz
q
q
e
n
Voltage Noise
4
LTC1541/LTC1542
ELECTRICAL CHARACTERISTICS
SYMBOL
Op Amp
V
OS
Input Offset Voltage
PARAMETER
CONDITIONS
V
CC
= 3V, V
SS
= 0V, T
A
= 25°C, unless otherwise noted.
MIN
TYP
MAX
0.70
1.25
1.65
1.00
1.75
0.01
80.0
45.5
22.0
20.0
1000
500
1
UNITS
mV
mV
mV
mV
mV
nA
V/mV
V/mV
V/mV
V/mV
kHz
V/ms
V
CC
– 1.3
0.40
0.50
1.00
0.19
0.21
0.23
V
mV/V
mV/V
mV/V
mV/V
mV/V
mV/V
V
V
V
V
CC
+ 0.05
V
CC
+ 0.10
V
CC
+ 0.12
0.6
0.4
1.2
0.8
0.95
1.8
3
V
V
V
mA
mA
mA
mA
µV
P-P
V
CM
= 1.5V (SO-8)
Commercial Grade (SO-8)
Industrial Grade (SO-8)
V
CM
= 1.5V (MSOP)
q
q
q
I
B
A
VOL
Input Bias Current
Large-Signal Gain
V
CM
= 1.5V
AMPOUT = 0.5V to 2.5V, No Load
AMPOUT = 0.5V to 2.5V, R
LOAD
= 100k
Commercial Grade
Industrial Grade
A
V
= 1V/V
A
V
= 1V/V
q
q
q
GBW
SR
V
CM
CMRR
Gain Bandwidth
Slew Rate
Input Common Mode Range
Common Mode Rejection Ratio
12
8
q
V
SS
V
CM
= V
SS
to (V
CC
– 1.3V)
Commercial Grade
Industrial Grade
V
CC
= 3V to 12V
Commercial Grade
Industrial Grade
R
LOAD
= 100k to V
SS
Commercial Grade
Industrial Grade
R
LOAD
= 100k to V
CC
Commercial Grade
Industrial Grade
q
q
q
q
PSRR
Power Supply Rejection Ratio
V
OH
Output High Voltage
V
CC
– 0.07
q
V
CC
– 0.10
q
V
CC
– 0.12
q
q
q
V
OL
Output Low Voltage
I
SOURCE
I
SINK
e
n
Output Source Current
Output Sink Current
q
Input Noise Voltage
f
O
= 0.1Hz to 10Hz
The
q
denotes specifications which apply over the full operating
temperature range.
Note 1:
Supply current is tested with COMPIN
+
= (REF – 100mV) for
LTC1541 and COMPIN
+
= 0V, COMPIN
–
= 100mV for LTC1542.
Note 2:
Input offset voltage is defined as the center of the input referred
hysteresis, V
CM
= REF (LTC1541). V
CM
= 1/2 V
CC
(LTC1542).
Note 3:
Trip point is defined as the differential input voltage required to
make the comparator output change state. The difference between upper
and lower trip point is equal to the width of the input referred hysteresis,
V
CM
= REF (LTC1541). V
CM
= 1/2 V
CC
(LTC1542).
Note 4:
The input leakage current is measured for COMPIN
+
at 1.5V
(LTC1541) and COMPIN
+
= COMPIN
–
= 1.5V (LTC1542).
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