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  • 封装8-Lead DFN (3mm x 3mm x 0.75mm w/ EP) 
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  • 封装8-WFDFN 裸露焊盘 
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  • 封装N/A 
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产品型号LTC1542CDD#PBF的Datasheet PDF文件预览

LTC1541/ LTC1542  
Mic ro p o we r Op Am p ,  
Co m p a ra to r a nd Re fe re nc e  
U
FEATURES  
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  
12.6Vordual±1.25Vto±6.3Vsupplywithatypicalsupply  
current of 5µA. Both the op amp and comparator feature  
acommonmodeinputvoltagerangethatextends fromthe  
negative supply to within 1.3V of the positive supply. The  
op amp output stage swings from rail-to-rail. The  
comparators inverting input is internally connected to the  
reference output (LTC1541).  
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 ±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  
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.  
Daisy-Chained Control Outputs  
Pin Compatible Upgrade for MAX951/MAX953  
U
The op amp is internally compensated to be unity-gain  
stable with typical GBW at 12kHz and slew rate of 8V/ms.  
Thecomparatorhas ±3mVofinternalhysteresis toensure  
clean output switching, even with slow moving input  
signals.  
APPLICATIONS  
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  
The LTC1541/LTC1542 are available in MSOP and SO-8  
packages.  
, LTC and LT are registered trademarks of Linear Technology Corporation.  
U
TYPICAL APPLICATION  
Pilot Light Flame Detector with Low-Battery Lockout  
Op Amp VOS Distribution,  
VCM = 2.5V, SO-8 Package  
V
= 3.6V TO 9V  
IN  
Total of 839 Units  
1N457  
10M  
50  
40  
30  
20  
10  
0
TYPE R  
V
V
SS  
= 5V  
= 0V  
CC  
1k  
100k  
3
8
OUTPUT HIGH = “ON”  
OUTPUT LOW = “OFF”  
+
+
1
10k  
1N457  
2.2µF  
1/2 LTC1541  
2N3904  
2
SCR LOAD  
2M  
1M  
I
CC  
= 7µA AT V = 5V  
IN  
5
6
+
LOW BATTERY  
7
1/2 LTC1541  
2M  
1.2V INTERNAL  
REFERENCE  
10k  
0
300  
–600  
–300  
600  
1541/42 • TA01  
VN2222  
INPUT OFFSET VOLTAGE (µV)  
1541/42 TA02  
1
LTC1541/ LTC1542  
W W  
U W  
ABSOLUTE MAXIMUM RATINGS  
Operating Temperature Range  
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  
Commercial ............................................. 0°C to 70°C  
Industrial ............................................ – 40°C to 85°C  
Lead Temperature (Soldering, 10 sec).................. 300°C  
W
U
/O  
PACKAGE RDER I FOR ATIO  
ORDER PART  
TOP VIEW  
ORDER PART  
NUMBER  
TOP VIEW  
NUMBER  
AMPOUT  
1
2
3
4
8
7
6
5
V
CC  
AMPOUT 1  
8 V  
CC  
7 COMPOUT  
6 REF  
5 COMPIN  
AMPIN  
COMPOUT  
REF  
LTC1541CS8  
LTC1541IS8  
AMPIN  
2
3
4
LTC1541CMS8  
+
+
AMPIN  
AMPIN  
+
V
SS  
+
V
SS  
COMPIN  
MS8 PACKAGE  
8-LEAD PLASTIC MSOP  
MS8 PART MARKING  
LTBE  
S8 PART MARKING  
S8 PACKAGE  
8-LEAD PLASTIC SO  
T
JMAX = 125°C, θJA = 250°C/W  
1541  
1541I  
T
JMAX = 125°C, θJA = 150°C/W  
ORDER PART  
NUMBER  
TOP VIEW  
ORDER PART  
NUMBER  
TOP VIEW  
AMPOUT  
1
2
3
4
8
7
6
5
V
CC  
AMPOUT 1  
8 V  
CC  
7 COMPOUT  
6 COMPIN  
5 COMPIN  
AMPIN  
COMPOUT  
LTC1542CS8  
LTC1542IS8  
AMPIN  
2
3
4
LTC1542CMS8  
+
+
AMPIN  
AMPIN  
COMPIN  
+
V
SS  
+
V
SS  
COMPIN  
MS8 PACKAGE  
8-LEAD PLASTIC MSOP  
MS8 PART MARKING  
LTDE  
S8 PART MARKING  
S8 PACKAGE  
8-LEAD PLASTIC SO  
T
JMAX = 125°C, θJA = 250°C/W  
1542  
1542I  
T
JMAX = 125°C, θJA = 150°C/W  
Consult factory for Military grade parts.  
ELECTRICAL CHARACTERISTICS  
VCC = 5V, VSS = 0V, TA = 25°C, unless otherwise noted.  
SYMBOL  
PARAMETER  
CONDITIONS  
MIN  
TYP  
MAX  
UNITS  
Power Supply  
V
Supply Voltage Range  
Supply Current (Note 1)  
2.5  
12.6  
V
CC  
I
CC  
5
7.5  
13  
14  
µA  
µA  
µA  
Commercial Grade  
Industrial Grade  
Comparator  
V
Input Offset Voltage (Note 2)  
Trip Point (Note 3)  
(SO-8)  
Commercial Grade (SO-8)  
Industrial Grade (SO-8)  
1
1.5  
2.0  
mV  
mV  
mV  
OS  
(MSOP)  
1.2  
2.0  
mV  
mV  
V
TRIP  
1.7  
1
2.25  
2.8  
3.8  
mV  
mV  
2
LTC1541/ LTC1542  
ELECTRICAL CHARACTERISTICS  
VCC = 5V, VSS = 0V, TA = 25°C, unless otherwise noted.  
MIN TYP  
SYMBOL  
PARAMETER  
CONDITIONS  
MAX  
UNITS  
nA  
I
Input Leakage Current (Note 4)  
Input Common Mode Range  
Common Mode Rejection Ratio  
0.01  
1
IN  
V
V
SS  
V – 1.3V  
CC  
V
CM  
CMRR  
V
CM  
= V to (V – 1.3V) (LTC1542)  
0.25  
0.30  
0.35  
mV/V  
mV/V  
mV/V  
SS  
CC  
Commercial Grade  
Industrial Grade  
PSRR  
Power Supply Rejection Ratio  
Propagation Delay  
V
= 3V to 12V  
0.25  
0.30  
0.35  
mV/V  
mV/V  
mV/V  
CC  
Commercial Grade (SO-8)  
Industrial Grade (SO-8)  
t
Overdrive = 10mV  
Overdrive = 100mV  
20  
8
µs  
µs  
PD  
V
Output High Voltage  
Output Low Voltage  
I
= 2mA  
= 1.8mA  
V – 0.2V  
CC  
V
V
OH  
OUT  
V
OL  
I
V + 0.3V  
SS  
OUT  
Reference (LTC1541 Only)  
V
REF  
Reference Voltage  
No Load (SO-8)  
Commercial Grade (SO-8)  
Industrial Grade (SO-8)  
1.195 1.200  
1.190  
1.188  
1.205  
1.210  
1.212  
V
V
V
No Load (MSOP)  
1.190 1.200  
1.185  
1.210  
1.215  
V
V
V  
REF  
Load Regulation  
I
= 2mA  
2
0.2  
6
1.5  
5
mV  
mV  
mV  
SOURCE  
I
= 10µA  
SINK  
e
Voltage Noise  
0.1Hz to 10Hz  
16  
µV  
P-P  
n
Op Amp  
V
OS  
Input Offset Voltage  
V
= 2.5V (SO-8)  
0.7  
1.25  
1.65  
mV  
mV  
mV  
CM  
Commercial Grade (SO-8)  
Industrial Grade (SO-8)  
V
= 2.5V (MSOP)  
= 2.5V  
CM  
1.00  
1.75  
mV  
mV  
CM  
I
Input Bias Current  
Large-Signal Gain  
V
0.01  
1
nA  
B
A
AMPOUT = 0.5V to 4.5V, No Load  
80  
60  
38  
35  
1000  
500  
V/mV  
V/mV  
V/mV  
V/mV  
VOL  
AMPOUT = 0.5V to 4.5V, R  
Commercial Grade  
= 100k  
LOAD  
Industrial Grade  
GBW  
SR  
Gain Bandwidth  
A = 1V/V  
12  
8
kHz  
V/ms  
V
V
Slew Rate  
A = 1V/V  
V
V
CM  
Input Common Mode Range  
Common Mode Rejection Ratio  
V
SS  
V – 1.3V  
CC  
CMRR  
V
CM  
= V to (V – 1.3V)  
0.28  
0.33  
0.38  
mV/V  
mV/V  
mV/V  
SS  
CC  
Commercial Grade  
Industrial Grade  
PSRR  
Power Supply Rejection Ratio  
Output High Voltage  
V
= 3V to 12V  
0.19  
0.21  
0.23  
mV/V  
mV/V  
mV/V  
CC  
Commercial Grade  
Industrial Grade  
V
OH  
R
LOAD  
= 100k to V  
V
CC  
V
CC  
V
CC  
– 0.07  
– 0.10  
– 0.12  
V
V
V
SS  
Commercial Grade  
Industrial Grade  
V
OL  
Output Low Voltage  
R
= 100k to V  
V + 0.05  
SS  
V
V
V
LOAD  
SS  
Commercial Grade  
Industrial Grade  
V
+ 0.10  
+ 0.12  
SS  
V
SS  
3
LTC1541/ LTC1542  
ELECTRICAL CHARACTERISTICS VCC = 5V, VSS = 0V, TA = 25°C, unless otherwise noted.  
SYMBOL  
PARAMETER  
CONDITIONS  
MIN  
TYP  
MAX  
UNITS  
I
Output Source Current  
0.9  
0.7  
1.8  
mA  
mA  
SOURCE  
I
Output Sink Current  
Input Noise Voltage  
1.3  
0.9  
1.8  
3
mA  
mA  
SINK  
e
f = 0.1Hz to 10Hz  
O
µV  
P-P  
n
VCC = 3V, VSS = 0V, TA = 25°C, unless otherwise noted.  
SYMBOL  
PARAMETER  
CONDITIONS  
MIN  
TYP  
MAX  
UNITS  
Power Supply  
V
Supply Voltage Range  
Supply Current (Note 1)  
2.5  
12.6  
V
CC  
I
CC  
4.5  
7.0  
12  
13  
µA  
µA  
µA  
Commercial Grade  
Industrial Grade  
Comparator  
V
OS  
Input Offset Voltage (Note 2)  
(SO-8)  
Commercial Grade (SO-8)  
Industrial Grade (SO-8)  
1.0  
1.5  
2.0  
mV  
mV  
mV  
(MSOP)  
1.2  
2.0  
mV  
mV  
V
Trip Point (Note 3)  
1.80  
1.00  
2.35  
0.01  
2.90  
3.90  
mV  
mV  
TRIP  
I
IN  
Input Leakage Current (Note 4)  
Input Common Mode Range  
Common Mode Rejection Ratio  
1
nA  
V
V
CM  
V
SS  
V – 1.3  
CC  
CMRR  
V
= V to (V – 1.3V) (LTC1542)  
0.35  
0.40  
0.45  
mV/V  
mV/V  
mV/V  
CM  
SS  
CC  
Commercial Grade  
Industrial Grade  
PSRR  
Power Supply Rejection Ratio  
Propagation Delay  
V
= 3V to 12V  
0.25  
0.30  
0.35  
mV/V  
mV/V  
mV/V  
CC  
Commercial Grade  
Industrial Grade  
t
Overdrive = 10mV  
Overdrive = 100mV  
25  
12  
µs  
µs  
PD  
V
Output High Voltage  
Output Low Voltage  
I
= 2mA  
= 1.8mA  
V – 0.2  
CC  
V
V
OH  
OUT  
V
OL  
I
V + 0.3  
SS  
OUT  
Reference (LTC1541 Only)  
V
REF  
Reference Voltage  
No Load (SO-8)  
Commercial Grade (SO-8)  
Industrial Grade (SO-8)  
1.195 1.200  
1.190  
1.188  
1.205  
1.210  
1.212  
V
V
V
No Load (MSOP)  
1.190 1.200  
1.185  
1.210  
1.215  
V
V
V  
Load Regulation  
Voltage Noise  
I
= 1mA  
= 10µA  
2
0.2  
6
1.5  
5
mV  
mV  
mV  
REF  
SOURCE  
I
SINK  
e
0.1Hz to 10Hz  
16  
µV  
P-P  
n
4
LTC1541/ LTC1542  
ELECTRICAL CHARACTERISTICS  
VCC = 3V, VSS = 0V, TA = 25°C, unless otherwise noted.  
SYMBOL  
PARAMETER  
CONDITIONS  
MIN  
TYP  
MAX  
UNITS  
Op Amp  
V
OS  
Input Offset Voltage  
V
= 1.5V (SO-8)  
0.70  
1.25  
1.65  
mV  
mV  
mV  
CM  
Commercial Grade (SO-8)  
Industrial Grade (SO-8)  
V
= 1.5V (MSOP)  
= 1.5V  
CM  
1.00  
1.75  
mV  
mV  
CM  
I
Input Bias Current  
Large-Signal Gain  
V
0.01  
1
nA  
B
A
AMPOUT = 0.5V to 2.5V, No Load  
80.0  
45.5  
22.0  
20.0  
1000  
500  
V/mV  
V/mV  
V/mV  
V/mV  
VOL  
AMPOUT = 0.5V to 2.5V, R  
Commercial Grade  
= 100k  
LOAD  
Industrial Grade  
GBW  
SR  
Gain Bandwidth  
A = 1V/V  
12  
8
kHz  
V/ms  
V
V
Slew Rate  
A = 1V/V  
V
V
CM  
Input Common Mode Range  
Common Mode Rejection Ratio  
V
SS  
V – 1.3  
CC  
CMRR  
V
CM  
= V to (V – 1.3V)  
0.40  
0.50  
1.00  
mV/V  
mV/V  
mV/V  
SS  
CC  
Commercial Grade  
Industrial Grade  
PSRR  
Power Supply Rejection Ratio  
Output High Voltage  
V
= 3V to 12V  
0.19  
0.21  
0.23  
mV/V  
mV/V  
mV/V  
CC  
Commercial Grade  
Industrial Grade  
V
OH  
R
LOAD  
= 100k to V  
V
CC  
– 0.07  
– 0.10  
– 0.12  
V
V
V
SS  
Commercial Grade  
Industrial Grade  
V
CC  
V
CC  
V
OL  
Output Low Voltage  
R
= 100k to V  
V + 0.05  
CC  
V
V
V
LOAD  
CC  
Commercial Grade  
Industrial Grade  
V
+ 0.10  
+ 0.12  
CC  
V
CC  
I
Output Source Current  
Output Sink Current  
Input Noise Voltage  
0.6  
0.4  
0.95  
1.8  
3
mA  
mA  
SOURCE  
I
1.2  
0.8  
mA  
mA  
SINK  
e
f = 0.1Hz to 10Hz  
O
µV  
P-P  
n
The  
temperature range.  
Note 1: Supply current is tested with COMPIN = (REF – 100mV) for  
denotes specifications which apply over the full operating  
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
= REF (LTC1541). V = 1/2 V (LTC1542).  
CM  
CM CC  
LTC1541 and COMPIN = 0V, COMPIN = 100mV for LTC1542.  
+
Note 4: The input leakage current is measured for COMPIN at 1.5V  
(LTC1541) and COMPIN = COMPIN = 1.5V (LTC1542).  
Note 2: Input offset voltage is defined as the center of the input referred  
+
hysteresis, V = REF (LTC1541). V = 1/2 V (LTC1542).  
CM  
CM  
CC  
5
LTC1541/ LTC1542  
U W  
TYPICAL PERFOR A CE CHARACTERISTICS  
Reference Output Voltage vs  
Load Current  
Supply Current vs Supply Voltage  
Supply Current vs Temperature  
1.205  
1.204  
1.203  
1.202  
1.201  
1.200  
1.199  
1.198  
1.197  
1.196  
1.195  
10  
9
8
7
6
5
4
3
2
1
0
10  
9
V
V
SS  
= 5V  
= GND  
V
= 5V  
= GND  
CC  
CC  
NONINVERTING  
V
SS  
V
= GND  
SS  
SOURCING  
CURRENT  
+
AMPIN = AMPOUT  
AMPIN = 2.5V  
AMPIN = V /2  
CC  
8
+
7
6
5
4
SINKING  
CURRENT  
3
2
1
10  
100  
1000  
10000  
2
3
4
5
6
7
8
9
10 11 12  
–50 –25  
0
25  
50  
75 100 125  
LOAD CURRENT (µA)  
SUPPLY VOLTAGE (V)  
TEMPERATURE (°C)  
1541/42 TPC03  
1541/42 TPC01  
1541/42 TPC02  
Op Amp Output Voltage vs  
Load Current  
Reference Output Voltage vs  
Temperature  
Op Amp DC Open-Loop Gain vs  
Temperature  
6
5
4
3
2
1
1x10  
1x10  
1x10  
1x10  
1x10  
1x10  
1
0.8  
1.202  
1.201  
1.200  
1.199  
1.198  
1.197  
1.196  
1.195  
V
= ±1.5V  
V
= 5V  
= GND  
SUPPLY  
CC  
V
SS  
0.6  
0.4  
V
SUPPLY  
= ±2.5V  
SINKING  
0.2  
CURRENT  
0
SOURCING  
CURRENT  
–0.2  
–0.4  
–0.6  
–0.8  
–1  
V
SUPPLY  
= ±2.5V  
V
= 5V  
CC  
V
= GND  
SS  
R
= 100kΩ  
V
= ±1.5V  
LOAD  
SUPPLY  
1
10  
100  
1000  
10000  
–50 –25  
0
25  
50  
75 100 125  
–50 –25  
0
25  
50  
75 100 125  
TEMPERATURE (°C)  
LOAD CURRENT (µA)  
TEMPERATURE (°C)  
1541/42 TPC05  
1541/42 TPC06  
1541/42 TPC04  
Op Amp Short-Circuit Current vs  
Supply Voltage  
Op Amp DC Open-Loop Gain vs  
Supply Voltage  
Comparator Output Voltage vs  
Load Current  
10,000  
1000  
100  
10  
5
4
3
2
1
0
10  
8
R
= 100kΩ  
V
V
SS  
= 5V  
= GND  
LOAD  
CC  
6
SHORT TO V  
SS  
SOURCING  
CURRENT  
4
2
0
–2  
–4  
–6  
–8  
–10  
SINKING  
CURRENT  
SHORT TO V  
CC  
NONINVERTING  
= GND  
1
V
SS  
+
AMPIN = V /2  
CC  
0.1  
2
3
4
5
6
7
8
9
10 11 12  
0.01  
0.1  
1
10  
100  
1000  
2
3
4
5
6
7
8
9
10 11 12  
SUPPLY VOLTAGE (V)  
LOAD CURRENT (mA)  
SUPPLY VOLTAGE (V)  
1541/42 TPC08  
1541/42 TPC09  
1541/42 TPC07  
6
LTC1541/ LTC1542  
U W  
TYPICAL PERFOR A CE CHARACTERISTICS  
Comparator Short-Circuit Current  
vs Supply Voltage  
Op Amp Small-Signal Transient  
Response  
250  
200  
150  
100  
50  
INPUT  
200mV/DIV  
SHORT TO V  
SS  
OUTPUT  
0
100mV/DIV  
–50  
–100  
–150  
–200  
–250  
SHORT TO V  
CC  
NONINVERTING  
AVCL = 1V/V  
1541/42 TPC11  
LOAD = 100k//100pF TO V  
SS  
2
3
4
5
6
7
8
9
10 11 12  
VSUPPLY = 5V  
SUPPLY VOLTAGE (V)  
1541/42 TPC10  
Op Amp Large-Signal Transient  
Response  
Op Amp Open-Loop Gain and  
Phase vs Frequency  
120  
100  
80  
0
INPUT  
–45  
2V/DIV  
–90  
PHASE  
60  
–135  
–180  
–225  
–270  
–315  
–360  
OUTPUT  
1V/DIV  
40  
GAIN  
20  
0
V
= 5V  
CC  
V = GND  
NONINVERTING  
AVCL = 1V/V  
1541/42 TPC11  
SS  
–20  
–40  
R
LOAD  
= 100kΩ  
LOAD = 100k//100pF TO V  
SS  
10  
100  
1k  
10k  
100k  
1M  
VSUPPLY = 5V  
FREQUENCY (Hz)  
1541/42 TPC13  
7
LTC1541/ LTC1542  
U
U
U
PIN FUNCTIONS  
AMPOUT (Pin 1): Op Amp Output. The output can swing  
from rail-to-rail while driving a capacitive load of up to  
1000pF. The output can source and sink 0.7mA (min).  
AMPIN(Pin 2): Inverting Input of Op Amp. The input  
REF (Pin 6) (LTC1541): Reference Output. VREF = 1.2V  
±1% over industrial temperature range, and is also con-  
nected to inverting comparator input internally. This de-  
vicecansourceupto2mAandsinkupto20µA. Theoutput  
can drive a bypass capacitor of up to 0.01µF without  
oscillation.  
common mode ranges from V to (V 1.3V). The input  
SS  
CC  
current is typically 10pA at 25°C.  
AMPIN+ (Pin 3): Noninverting Input of Op Amp. The input  
COMPIN(Pin6)(LTC1542):InvertingInputofCompara-  
tor. The input common mode ranges from VSS to  
common mode ranges from V to (V 1.3V). The input  
SS  
CC  
(V – 1.3V). The input current is typically 10pA at 25°C.  
CC  
current is typically 10pA at 25°C.  
COMPOUT (Pin 7): Comparator Output. The output can  
source 20mA and sink 5mA.  
V (Pin 4): Negative Supply or Ground Connection.  
COMPIN+ (Pin 5): Noninverting Input of Comparator. The  
SS  
V (Pin8): PositiveSupply, 2.5VV 12.6V. Thesupply  
CC  
CC  
input common mode ranges from V to (V 1.3V). The  
SS  
CC  
bypass capacitors are not required if the supply impedance  
is low. For single supply applications, it is a good general  
input current is typically 10pA at 25°C.  
practice to bypass V with a 0.1µF capacitor to ground.  
CC  
W
BLOCK DIAGRA S  
LTC1541  
V
8
7
CC  
+
1
AMPOUT  
COMPOUT  
REF  
OP AMP  
6
×1  
2
3
AMPIN  
COMP  
+
AMPIN  
+
COMPIN  
5
4
V
SS  
+
LTC1541 • BD  
LTC1542  
V
8
7
CC  
+
1
AMPOUT  
COMPOUT  
OP AMP  
AMPIN  
2
3
COMP  
COMPIN  
6
5
+
AMPIN  
+
COMPIN  
V
SS  
4
+
LTC1542 • BD  
8
LTC1541/ LTC1542  
U
W U U  
APPLICATIONS INFORMATION  
TheLTC1541/LTC1542areacombinationofamicropower  
op amp, comparator and 1.2V ±1% reference (LTC1541)  
in an 8-pin package. The LTC1541 has the negative input  
of the comparator internally connected to the reference  
output. The supply voltage range is from 2.5V to 12.6V for  
single supply and ±1.25V to ±6.3V for dual supplies. The  
supply current is a mere 5µA (typical) with a 5V single  
supply.  
The output can source up to 2mA and sink up to 20µA with  
a 5V supply. The output can drive a bypass capacitor of up  
to 0.01µF without oscillation and by inserting a series  
resistor, capacitance values up to 100µF can be used  
(Figure 1). Figure 2 shows the resistor value required for  
different capacitor values to achieve critical damping.  
Bypassing the reference can help prevent false tripping of  
the comparator by preventing glitches on V or reference  
CC  
load transients from disturbing the reference output volt-  
age. Figures 3a and 3b show the bypass reference output  
Op Amp  
with a square wave applied to the V pin while resistor R1  
damps the reference response. Note that the comparator  
output doesnt trip.  
CC  
The op amp is internally compensated to be unity-gain  
stable, with typical GBW at 12kHz and slew rate of 8V/ms.  
The output can drive a capacitive load of up to 1000pF and  
swings from rail-to-rail. The input range is from the  
negative rail to within 1.3V of the positive rail. The input  
bias current is less than 1nA maximum at the extended  
temperature range.  
Op Amp Stability  
Unlike other industry standard micropower CMOS op  
amps, the op amp in the LTC1541/LTC1542 maintain  
stability in unity-gain configuration while driving heavy  
capacitive loads of up to 1000pF.  
8
V
CC  
LTC1541  
Althoughthis familyis primarilydesignedforlowfrequency  
applications,goodlayoutisextremelyimportant.Lowpower,  
high impedance circuits may increase the effects of board  
leakage and stray capacitance. For example, the combina-  
tion of a 10M resistance (from leakage between traces on a  
contaminated, poorly designed PC board) and a 1pF stray  
capacitance provides a pole at approximately 16kHz, which  
is near the amplifiers bandwidth. Board routing and layout  
should minimize leakage and stray capacitance. In some  
cases, stray capacitance may be unavoidable and it may be  
necessary to add a small capacitor across the feedback  
resistor to compensate (Figure 4); select the smallest  
capacitor value that ensures stability.  
REF  
6
×1  
R1  
C1  
GND  
4
1541/42 • F01  
Figure 1. Damping the Reference Output  
Comparator  
The comparator has a high impedance differential input  
stage with a common mode input range from the negative  
rail to within 1.3V of the positive rail. The CMOS output  
stage can swing from rail-to-rail and source up to 20mA  
continuously. The output stage has been designed to  
eliminate the power supply glitches that normally occur  
when the output changes logic state. In addition, internal  
hysteresis (±3mV) ensures clean output switching even  
with slow moving input signals. The negative input is  
internally connected to the reference for the LTC1541.  
Inputs  
The input common mode range for both the op amp and  
comparatoris fromthenegativesupplytowithin1.3Vofthe  
positive supply. The inputs can be taken more than 300mV  
below the negative supply without damaging the device if  
the current out of the pin is limited to less than 1mA. Unlike  
bipolar input op amps and comparators, the outputs of the  
CMOS LTC1541/LTC1542 will not reverse phase when the  
inputs are taken above the common mode input range.  
Reference  
The internal bandgap reference has an output voltage of  
1.2V ±1% over the industrial grade temperature range.  
9
LTC1541/ LTC1542  
U
W U U  
APPLICATIONS INFORMATION  
1000  
LTC1541  
8
V
CC  
7
6
COMPOUT  
REF  
100  
10  
1
5V TO 8V  
×1  
R1  
430  
COMP  
+
5
COMPIN  
C1  
1µF  
+
0.1  
0.001  
0.01  
0.1  
1
10  
GND  
4
CAPACITOR VALUE (µF)  
1541/42 • F02  
Figure 2. Damping Resistance vs Bypass Capacitor Value  
1541/42 • F03a  
Figure 3a. Reference Transient Response Test Circuit  
8V  
V+  
+
AMPIN  
5V  
+
AMPOUT  
OP AMP  
V
REF  
R2  
OUT  
2pF TO 10pF  
R1  
2ms/DIV  
LTC1541 • F03b  
1541/42 • F04  
Figure 4. Compensation for Feedback Node Capacitance  
Figure 3b. Reference and Comparator Output Transient Response  
U
TYPICAL APPLICATIO S  
Shunt Battery Charger with Low-Battery Load Disconnect  
Si9405  
2A  
FUSE  
1M  
1M  
7.5  
6.8V  
3.65M  
10W  
DALE  
HLM-10  
8M  
1M  
ZENER  
1N754  
1A  
SOLAR  
ARRAY  
TIP121  
8
3
2
5
6
+
+
LOAD  
12V  
5AHR  
GEL CELL  
1/2  
LTC1541  
1
1/2  
LTC1541  
7
VN2222  
4
340k  
V
= 1.2V  
REF  
(INTERNAL)  
1541/42 TA06  
10  
LTC1541/ LTC1542  
U
TYPICAL APPLICATIO S  
Negative Reference  
Sungle Supply Function Generator  
V
CC  
V
CC  
3V TO 9V  
3V TO 12V  
0.1µF  
200k  
5M  
5M  
8
2
3
R2  
500k  
1
6
5
LTC1542  
OP AMP  
2
3
8
LT1634-2.5  
7
LTC1542  
COMP  
1
+
V
–2.5V  
LTC1542  
OP AMP  
OUT  
4
R1  
10M  
+
+
4
R3  
5M  
1541/42 TA04  
V
SS  
1541/42 TA05  
–3V  
R1  
4C • R2 • R3  
FREQ ≈  
U
Dimensions in inches (millimeters) unless otherwise noted.  
PACKAGE DESCRIPTION  
MS8 Package  
8-Lead Plastic MSOP  
(LTC DWG # 05-08-1660)  
0.118 ± 0.004*  
(3.00 ± 0.10)  
8
7
6
5
0.040 ± 0.006  
(1.02 ± 0.15)  
0.006 ± 0.004  
(0.15 ± 0.10)  
0.007  
(0.18)  
0° – 6° TYP  
0.118 ± 0.004**  
(3.00 ± 0.10)  
SEATING  
PLANE  
0.192 ± 0.004  
(4.88 ± 0.10)  
0.021 ± 0.004  
(0.53 ± 0.01)  
0.012  
(0.30)  
0.025  
(0.65)  
TYP  
MSOP08 0596  
1
2
3
4
*
DIMENSION DOES NOT INCLUDE MOLD FLASH, PROTRUSIONS OR GATE BURRS. MOLD FLASH,  
PROTRUSIONS OR GATE BURRS SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE  
** DIMENSION DOES NOT INCLUDE INTERLEAD FLASH OR PROTRUSIONS.  
INTERLEAD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE  
S8 Package  
8-Lead Plastic Small Outline (Narrow 0.150)  
(LTC DWG # 05-08-1610)  
0.189 – 0.197*  
(4.801 – 5.004)  
0.010 – 0.020  
(0.254 – 0.508)  
7
5
8
6
× 45°  
0.053 – 0.069  
(1.346 – 1.752)  
0.004 – 0.010  
(0.101 – 0.254)  
0.008 – 0.010  
(0.203 – 0.254)  
0°– 8° TYP  
0.150 – 0.157**  
(3.810 – 3.988)  
0.228 – 0.244  
(5.791 – 6.197)  
0.016 – 0.050  
0.406 – 1.270  
0.050  
(1.270)  
BSC  
0.014 – 0.019  
(0.355 – 0.483)  
*
DIMENSION DOES NOT INCLUDE MOLD FLASH. MOLD FLASH  
SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE  
SO8 0695  
**  
DIMENSION DOES NOT INCLUDE INTERLEAD FLASH. INTERLEAD  
FLASH SHALL NOT EXCEED 0.010" (0.254mm) PER SIDE  
1
3
4
2
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.  
However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen-  
tationthattheinterconnectionofits circuits as describedhereinwillnotinfringeonexistingpatentrights.  
11  
LTC1541/ LTC1542  
U
TYPICAL APPLICATIO S  
Voltage Control Oscillator  
C1  
0.047µF  
V
CC  
R1  
300k  
8
2
3
R4  
5M  
1
5V  
0V  
6
5
LTC1542  
OP AMP  
1M  
7
V
LTC1542  
COMP  
IN  
V
OUT  
+
0V – V  
4
CC  
R2  
+
1M  
150k  
V
C
FREQ ≈  
2.4C • R1 • V  
CC  
R3  
500k  
R4  
1.1M  
VALUES SHOWN ARE FOR  
100Hz WITH V = V  
IN  
CC  
VN2222  
1541/42 TA03  
VN2222  
Linear Lithium-Ion Charger  
D1  
1N5817  
Q1  
FZT2907A  
V
IN  
6V  
300mA  
R8  
249k  
0.5%  
C3  
0.01µF  
R1  
220Ω  
0.25W  
IC1  
V
CC  
8
LTC1541  
R5  
2.2M  
×1  
300mA  
4.2V FLOAT  
Q2  
2N3906  
1
2
7
6
Li-ION  
R1  
1M  
3
4
5
SHUTDOWN  
+
+
C2  
0.1µF  
V
SS  
R9  
100k  
0.5%  
R6  
33k  
R3  
3.83k  
1%  
R4  
100k  
1%  
C1  
4700pF  
R7  
0.15Ω  
1541/42 TA07  
RELATED PARTS  
PART NUMBER  
DESCRIPTION  
COMMENTS  
LT®1078/LT1079  
Dual/Quad Micropower, Single Supply Precision Op Amps  
70µV, V Max and 0.4µV/°C Drift, 200kHz GBW, 0.07V/µs  
OS  
Slew Rate, Input/Output Common Mode Includes Ground  
LT1178/LT1179  
LT1490/LT1491  
Dual/Quad 17µA Max, Single Supply Precision Op Amps  
70µV, V Max and 2.5µV/°C Drift Max, 85kHz GBW, 0.04V/µs  
Slew Rate, Input/Output Common Mode Includes Ground  
OS  
Dual/Quad Micropower Rail-to-Rail Input and Output Op Amps Single Supply Input Range: 0.4V to 44V, Micropower 50µA  
Amplifier, Rail-to-Rail Input and Output, 200kHz GBW  
LT1635  
Micropower Rail-to-Rail Op Amp and Reference  
130µA of Supply Current, 1.3mV V Max  
OS  
LT2078/LT2079  
LT2178/LT2179  
Dual/Quad Micropower, Single Supply Precision Op Amps  
Dual/Quad 17µA Max, Single Supply Precision Op Amps  
SO-8 and 14-Lead Standard Pinout, 70µV V Max, 200kHz GBW  
OS  
SO-8 and 14-Lead Standard Pinout, 70µV V Max, 85kHz GBW  
OS  
15412f LT/TP 0798 4K • PRINTED IN USA  
LINEAR TECHNOLOGY CORPORATION 1998  
LinearTechnology Corporation  
1630 McCarthy Blvd., Milpitas, CA 95035-7417  
12  
(408)432-1900 FAX:(408)434-0507 www.linear-tech.com  
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