LTC1541/LTC1542
Micropower Op Amp,
Comparator and Reference
FEATURES
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DESCRIPTIO
Quiescent Current: 5µA Typ
Outputs Swing Rail-to-Rail
Low Op Amp Offset Voltage: 700µV 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
±2.25mV
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
Daisy-Chained Control Outputs
Pin Compatible Upgrade for MAX951/MAX953
Available in 3mm x 3mm x 0.8mm DFN Package
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
±2.25mV
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. For space-limited applications, the LTC1541/
LTC1542 are available in a 3mm x 3mm low profile
(0.8mm) dual fine-pitch leadless package (DFN).
APPLICATIO S
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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
, LTC and LT are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
TYPICAL APPLICATIO
1N457
TYPE R
1k
100k
1N457
10M
Pilot Light Flame Detector with Low-Battery Lockout
V
IN
= 3.6V TO 9V
3
–
+
+
–
8
1
10k
2.2µF 1/2 LTC1541
2
OUTPUT HIGH = “ON”
OUTPUT LOW = “OFF”
PERCENT OF UNITS (%)
2N3904
SCR LOAD
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
–
0
–600
0
300
–300
INPUT OFFSET VOLTAGE (µV)
600
1541/42 TA02
10k
VN2222
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
U
U
15412fd
1
LTC1541/LTC1542
ABSOLUTE
AXI U
RATI GS
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
(DD Package) ................................... – 65°C to 125°C
PACKAGE/ORDER I FOR ATIO
TOP VIEW
AMPOUT
AMPIN
–
1
2
3
4
8
7
6
5
V
CC
COMPOUT
REF
COMPIN
+
AMPOUT
AMPIN
–
AMPIN
+
V
SS
1
2
3
4
AMPIN
+
V
SS
DD PACKAGE
8-LEAD (3mm
×
3mm) PLASTIC DFN
T
JMAX
= 125°C,
θ
JA
= 160°C/W (NOTE 6)
UNDERSIDE METAL CONNECTED TO V
–
(PCB CONNECTION OPTIONAL)
MS8 PACKAGE
8-LEAD PLASTIC MSOP
T
JMAX
= 150°C,
θ
JA
= 250°C/W
ORDER PART
NUMBER
LTC1541CDD
LTC1541IDD
DD
PART MARKING*
LAAT
ORDER PART
NUMBER
LTC1541CMS8
LTC1541IMS8
TOP VIEW
TOP VIEW
AMPOUT
AMPIN
–
AMPIN
+
V
SS
1
2
3
4
8
7
6
5
V
CC
COMPOUT
COMPIN
–
COMPIN
+
AMPOUT
AMPIN
–
AMPIN
+
V
SS
1
2
3
4
DD PACKAGE
8-LEAD (3mm
×
3mm) PLASTIC DFN
T
JMAX
= 125°C,
θ
JA
= 160°C/W (NOTE 6)
UNDERSIDE METAL CONNECTED TO V
–
(PCB CONNECTION OPTIONAL)
MS8 PACKAGE
8-LEAD PLASTIC MSOP
T
JMAX
= 150°C,
θ
JA
= 250°C/W
ORDER PART
NUMBER
LTC1542CDD
LTC1542IDD
DD
PART MARKING*
LAAU
ORDER PART
NUMBER
LTC1542CMS8
LTC1542IMS8
Order Options
Tape and Reel: Add #TR
Lead Free: Add #PBF Lead Free Tape and Reel: Add #TRPBF
Lead Free Part Marking:
http://www.linear.com/leadfree/
Consult LTC Marketing for parts specified with wider operating temperature ranges.
*Temperature grades are identified by a label on the shipping container.
15412fd
2
U
U
W
W W
U
W
(Note 1)
Operating Temperature Range (Note 7) .. – 40°C to 85°C
Specified Temperature Range (Note 8) ... – 40°C to 85°C
Lead Temperature (Soldering, 10 sec).................. 300°C
TOP VIEW
TOP VIEW
8
7
6
5
V
CC
COMPOUT
REF
COMPIN
+
AMPOUT 1
AMPIN
–
2
8
7
6
5
V
CC
COMPOUT
REF
COMPIN
+
AMPIN
+
3
V
SS
4
S8 PACKAGE
8-LEAD PLASTIC SO
T
JMAX
= 150°C,
θ
JA
= 150°C/W
MS8
PART MARKING
LTBE
LTADW
ORDER PART
NUMBER
LTC1541CS8
LTC1541IS8
S8
PART MARKING
1541
1541I
TOP VIEW
8
7
6
5
V
CC
COMPOUT
COMPIN
–
COMPIN
+
AMPOUT 1
AMPIN
–
2
AMPIN
+
3
V
SS
4
8
7
6
5
V
CC
COMPOUT
COMPIN
–
COMPIN
+
S8 PACKAGE
8-LEAD PLASTIC SO
T
JMAX
= 150°C,
θ
JA
= 150°C/W
MS8
PART MARKING
LTDE
LTADX
ORDER PART
NUMBER
LTC1542CS8
LTC1542IS8
S8
PART MARKING
1542
1542I
LTC1541/LTC1542
ELECTRICAL CHARACTERISTICS
SYMBOL
Power Supply
V
CC
I
CC
Supply Voltage Range
Supply Current (Note 2)
PARAMETER
CONDITIONS
The
●
denotes specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
CC
= 5V, V
SS
= 0V, unless otherwise noted.
MIN
●
TYP
MAX
12.6
UNITS
V
µA
µA
µA
mV
mV
mV
mV
mV
mV
mV
mV
nA
V
mV/V
mV/V
mV/V
mV/V
mV/V
mV/V
µs
µs
V
2.5
5
Commercial Grade
Industrial Grade
Comparator
V
OS
Input Offset Voltage (Note 3)
(SO-8)
Commercial Grade (SO-8)
Industrial Grade (SO-8)
(MSOP)(DFN)
Commercial Grade (MSOP)(DFN)
Industrial Grade (MSOP)(DFN)
V
TRIP
I
IN
V
CM
CMRR
Trip Point (Note 4)
●
●
10
16
17
1
1.5
2.0
1.2
2.0
2.5
●
●
●
●
●
1.7
1
V
SS
2.25
0.01
2.8
3.8
1
V
CC
– 1.3V
0.7
0.8
0.9
0.25
0.30
0.35
Input Leakage Current (Note 5)
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 (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)
Commercial Grade (MSOP)
Industrial Grade (MSOP)
No Load (DFN)
Commercial Grade (DFN)
Industrial Grade (DFN)
●
●
●
●
●
●
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
●
V
CC
– 0.2V
●
V
SS
+ 0.3V
1.195
1.190
1.188
1.190
1.185
1.183
1.185
1.180
1.178
1.200
1.205
1.210
1.212
1.210
1.215
1.217
1.215
1.220
1.222
6
1.5
5
V
V
V
V
V
V
V
V
V
V
mV
mV
mV
µV
P-P
Reference (LTC1541 Only)
●
●
●
●
●
●
●
●
1.200
1.200
∆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) (DFN)
Commercial Grade (MSOP) (DFN)
Industrial Grade (MSOP) (DFN)
2
0.2
16
e
n
Op Amp
V
OS
Voltage Noise
Input Offset Voltage
●
●
●
●
0.7
1.25
1.65
1.00
1.75
2.0
mV
mV
mV
mV
mV
mV
15412fd
3
LTC1541/LTC1542
ELECTRICAL CHARACTERISTICS
SYMBOL
I
B
A
VOL
PARAMETER
Input Bias Current
Large-Signal Gain
CONDITIONS
V
CM
= 2.5V
The
●
denotes specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
CC
= 5V, V
SS
= 0V, unless otherwise noted.
MIN
●
TYP
0.01
1000
500
MAX
1
UNITS
nA
V/mV
V/mV
V/mV
V/mV
kHz
V/ms
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
●
●
80
60
38
35
GBW
SR
V
CM
CMRR
Gain Bandwidth
Slew Rate
Input Common Mode Range
Common Mode Rejection Ratio
12
8
●
V
SS
V
CC
– 1.3V
0.5
0.6
0.6
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
CC
Commercial Grade
Industrial Grade
●
●
●
●
●
●
●
●
●
PSRR
Power Supply Rejection Ratio
V
OH
Output High Voltage
V
CC
– 0.07
V
CC
– 0.10
V
CC
– 0.12
V
SS
+ 0.05
V
SS
+ 0.10
V
SS
+ 0.12
0.9
0.7
1.3
0.9
1.8
1.8
3
V
OL
Output Low Voltage
V
V
V
mA
mA
mA
mA
µV
P-P
I
SOURCE
I
SINK
e
n
Output Source Current
Output Sink Current
●
Input Noise Voltage
f
O
= 0.1Hz to 10Hz
The
●
denotes specifications which apply over the full operating temperature range, otherwise specifications are at T
A
= 25°C.
V
CC
= 3V, V
SS
= 0V, unless otherwise noted.
SYMBOL
Power Supply
V
CC
I
CC
Supply Voltage Range
Supply Current (Note 2)
Commercial Grade
Industrial Grade
Comparator
V
OS
Input Offset Voltage (Note 3)
(SO-8)
Commercial Grade (SO-8)
Industrial Grade (SO-8)
(MSOP)(DFN)
Commercial Grade (MSOP)(DFN)
Industrial Grade (MSOP)(DFN)
V
TRIP
I
IN
V
CM
CMRR
Trip Point (Note 4)
●
●
●
●
●
●
●
●
PARAMETER
CONDITIONS
MIN
2.5
TYP
MAX
12.6
UNITS
V
µA
µA
µA
mV
mV
mV
mV
mV
mV
mV
mV
nA
V
mV/V
mV/V
mV/V
15412fd
4.5
9.5
15
16
1.0
1.5
2.0
1.2
2.0
2.5
1.80
1.00
V
SS
2.35
0.01
2.90
3.90
1
V
CC
– 1.3
0.8
0.9
1.0
Input Leakage Current (Note 5)
Input Common Mode Range
Common Mode Rejection Ratio
V
CM
= V
SS
to (V
CC
– 1.3V) (LTC1542)
Commercial Grade
Industrial Grade
●
●
●
●
4
LTC1541/LTC1542
ELECTRICAL CHARACTERISTICS
SYMBOL
PSRR
PARAMETER
Power Supply Rejection Ratio
CONDITIONS
The
●
denotes specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
CC
= 3V, V
SS
= 0V, unless otherwise noted.
MIN
●
●
TYP
MAX
0.25
0.30
0.35
UNITS
mV/V
mV/V
mV/V
µs
µs
V
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)
Commercial Grade (MSOP)
Industrial Grade (MSOP)
No Load (DFN)
Commercial Grade (DFN)
Industrial Grade (DFN)
t
PD
V
OH
V
OL
V
REF
Propagation Delay
Output High Voltage
Output Low Voltage
Reference Voltage
25
12
●
●
V
CC
– 0.2
V
SS
+ 0.3
1.195
1.190
1.188
1.190
1.185
1.183
1.185
1.180
1.178
1.200
1.205
1.210
1.212
1.210
1.215
1.217
1.215
1.220
1.222
6
1.5
5
V
V
V
V
V
V
V
V
V
V
mV
mV
mV
µV
P-P
Reference (LTC1541 Only)
●
●
●
●
●
●
●
●
1.200
1.200
∆V
REF
Load Regulation
I
SOURCE
= 1mA
I
SINK
= 10µA
0.1Hz to 10Hz
V
CM
= 1.5V (SO-8)
Commercial Grade (SO-8)
Industrial Grade (SO-8)
V
CM
= 1.5V (MSOP)
Commercial Grade (MSOP) (DFN)
Industrial Grade (MSOP) (DFN)
2
0.2
16
e
n
Op Amp
V
OS
Voltage Noise
Input Offset Voltage
●
●
●
●
●
0.7
1.25
1.65
1.00
1.75
2.0
0.01
80.0
45.5
22.0
20.0
1000
500
1
mV
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
= 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
●
●
GBW
SR
V
CM
CMRR
Gain Bandwidth
Slew Rate
Input Common Mode Range
Common Mode Rejection Ratio
12
8
●
V
SS
V
CC
– 1.3
0.7
0.8
0.8
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
CC
Commercial Grade
Industrial Grade
●
●
●
●
PSRR
Power Supply Rejection Ratio
V
OH
Output High Voltage
V
CC
– 0.07
●
V
CC
– 0.10
●
V
CC
– 0.12
●
●
V
OL
Output Low Voltage
V
CC
+ 0.05
V
CC
+ 0.10
V
CC
+ 0.12
V
V
V
15412fd
5
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