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Final Electrical Specifications
LTC1541 Micropower Op Amp, Comparator and Reference
January 1998
FEATURES
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DESCRIPTION
The LTC(R)1541 combines a micropower amplifier, comparator and bandgap reference 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 5A. 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. The reference output voltage is 1.2V 1% over the extended temperature range. The output can drive a bypass capacitor of up to 0.01F without any oscillations. It can also source up to 2mA and sink up to 20A. 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 is available in MSOP and SO-8 packages.
, LTC and LT are registered trademarks of Linear Technology Corporation.
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Quiescent Current: 5A Typ Outputs Swing Rail-to-Rail Low Op Amp Offset Voltage: 700V Max Reference Output Drives 0.01F Capacitor Internal 1.2V 0.4% Reference Output 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
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
VIN = 3.6V TO 9V 1N457 TYPE R 1k 100k 1N457 10M
3
-
+
+ -
8 1
REFERENCE OUTPUT (V)
10k
2.2F 1/2 LTC1541 2
OUTPUT HIGH = "ON" OUTPUT LOW = "OFF"
2N3904 SCR LOAD
ICC = 7A AT VIN = 5V
2M 5 1M 6 2M 1.2V INTERNAL REFERENCE
LTC1541 * TA01
+
1/2 LTC1541 7 LOW BATTERY
-
10k VN2222
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 representation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
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Reference Output vs Temperature
1.202 1.201 1.200 1.199 1.198 1.197 1.196 1.195 - 50 -25
50 25 75 0 TEMPERATURE (C)
100
125
1541 TA02
1
LTC1541 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 ................. - 65C to 150C Operating Temperature Range Commercial ............................................. 0C to 70C Industrial ............................................ - 40C to 85C Lead Temperature (Soldering, 10 sec).................. 300C
PACKAGE/ORDER I FOR ATIO
TOP VIEW AMPOUT AMPIN - AMPIN+ VSS 1 2 3 4 8 7 6 5 VCC COMPOUT REF COMPIN +
ORDER PART NUMBER LTC1541CMS8 MS8 PART MARKING LTBE
MS8 PACKAGE 8-LEAD PLASTIC MSOP TJMAX = 125C, JA = 250C/W
Consult factory for Military grade parts.
ELECTRICAL CHARACTERISTICS
SYMBOL Power Supply VCC ICC Supply Voltage Range Supply Current (Note 1) PARAMETER CONDITIONS
VCC = 5V, VSS = 0V, TA = 25C, unless otherwise noted.
MIN
q
Commercial Grade Industrial Grade Comparator VOS Input Offset Voltage (Note 2) (SO-8) Commercial Grade (SO-8) Industrial Grade (SO-8) (MSOP)
VTRIP IIN VCM PSRR
Trip Point (Note 3)
q
Input Leakage Current (Note 4) Input Common Mode Range Power Supply Rejection Ratio
VCOMPIN+ = 2.5V VCC = 3V to 12V Commercial Grade (SO-8) Industrial Grade (SO-8) Overdrive = 10mV Overdrive = 100mV IOUT = - 2mA IOUT = 1.8mA
tPD VOH VOL
Propagation Delay Output High Voltage Output Low Voltage
2
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W
WW U
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TOP VIEW AMPOUT 1 AMPIN- 2 AMPIN+ 3 VSS 4 8 7 6 5 VCC COMPOUT REF COMPIN +
ORDER PART NUMBER LTC1541CS8 LTC1541IS8 S8 PART MARKING 1541 1541I
S8 PACKAGE 8-LEAD PLASTIC SO TJMAX = 125C, JA = 150C/W
TYP
MAX 12.6
UNITS V A A A mV mV mV mV mV mV mV nA V mV/V mV/V mV/V s s V
2.5 5
q q
7.5 13 14 1 1.5 2.0 1.2 2.0
q q q
2 1 VSS
2.25 0.01
2.50 3.5 1 VCC - 1.3V 0.25 0.30 0.35
q q q q
20 8
q VCC - 0.2V q
VSS + 0.3V
V
LTC1541
ELECTRICAL CHARACTERISTICS
SYMBOL Reference VREF Reference Voltage No Load (SO-8) Commercial Grade (SO-8) Industrial Grade (SO-8) No Load (MSOP)
q q q
VCC = 5V, VSS = 0V, TA = 25C, unless otherwise noted.
MIN 1.195 1.190 1.188 1.190 1.185 TYP 1.200 MAX 1.205 1.210 1.212 1.210 1.215 6 1.5 5 UNITS V V V V V mV mV mV VP-P 0.7 1.25 1.5 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 VCC - 1.3V 0.20 0.25 0.30 0.19 0.21 0.23 VCC - 0.05 VCC - 0.10 VCC - 0.12 VSS + 0.05 VSS + 0.10 VSS + 0.12 0.9 0.7 1.3 0.9 1.8 1.8 3 V mV/V mV/V mV/V mV/V mV/V mV/V V/mV V/mV V/mV V/mV V/mV V/mV mA mA mA mA VP-P
PARAMETER
CONDITIONS
1.200 2 0.2 16
VREF
Load Regulation
ISOURCE = 2mA ISINK = 10A 0.1Hz to 10Hz VCM = 2.5V (SO-8) Commercial Grade (SO-8) Industrial Grade (SO-8) VCM = 2.5V (MSOP)
q q
en Op Amp VOS
Voltage Noise Input Offset Voltage
q q q
IB AVOL
Input Bias Current Large-Signal Gain
VCM = 2.5V AMPOUT = 0.5V to 4.5V, No Load AMPOUT = 0.5V to 4.5V, RLOAD = 100k Commercial Grade Industrial Grade AV = 1V/V AV = 1V/V
q
q q
GBW SR VCM CMRR
Gain Bandwidth Slew Rate Input Common Mode Range Common Mode Rejection Ratio
12 8
q
VSS
VCM = VSS to VCC - 1.3V Commercial Grade Industrial Grade VCC = 3V to 12V Commercial Grade Industrial Grade RLOAD = 100k to VSS Commercial Grade Industrial Grade RLOAD = 100k to VSS Commercial Grade Industrial Grade
q q q q q q q q q
PSRR
Power Supply Rejection Ratio
VOH
Output High Voltage
VOL
Output Low Voltage
ISOURCE ISINK en
Output Source Current Output Sink Current
q
Input Noise Voltage
fO = 0.1Hz to 10Hz
3
LTC1541
ELECTRICAL CHARACTERISTICS
SYMBOL Power Supply VCC ICC Supply Voltage Range Supply Current (Note 1) PARAMETER CONDITIONS
VCC = 3V, VSS = 0V, TA = 25C, unless otherwise noted.
MIN
q
TYP
MAX 12.6
UNITS V A A A mV mV mV mV mV mV mV nA V mV/V mV/V mV/V s s V
2.5 4.5
Commercial Grade Industrial Grade Comparator VOS Input Offset Voltage (Note 2) (SO-8) Commercial Grade (SO-8) Industrial Grade (SO-8) (MSOP)
q q
7.0 12 13 1.0 1.5 2.0 1.2 2.0
q q q
VTRIP IIN VCM PSRR
Trip Point (Note 3)
q
2.00 1.00 VSS
2.25 0.01
2.50 3.50 1 VCC - 1.3 0.25 0.30 0.35
Input Leakage Current (Note 4) Input Common Mode Range Power Supply Rejection Ratio VCC = 3V to 12V Commercial Grade Industrial Grade Overdrive = 10mV Overdrive = 100mV IOUT = - 2mA IOUT = 1.8mA No Load (SO-8) Commercial Grade (SO-8) Industrial Grade (SO-8) No Load (MSOP)
q q q q
tPD VOH VOL Reference VREF
Propagation Delay Output High Voltage Output Low Voltage Reference Voltage
25 12
q q
VCC - 0.2 VSS + 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 VP-P
q q q
1.200 2 0.2 16
VREF
Load Regulation
ISOURCE = 1mA ISINK = 10A 0.1Hz to 10Hz VCM = 1.5V (SO-8) Commercial Grade (SO-8) Industrial Grade (SO-8) VCM = 1.5V (MSOP)
q q
en Op Amp VOS
Voltage Noise Input Offset Voltage
q q q
0.70 1.25 1.50 1.00 1.75 0.01 80.0 45.5 22.0 20.0 1000 500 1
mV mV mV mV mV nA V/mV V/mV V/mV V/mV kHz V/ms
IB AVOL
Input Bias Current Large-Signal Gain
VCM = 1.5V AMPOUT = 0.5V to 2.5V, No Load AMPOUT = 0.5V to 2.5V, RLOAD = 100k Commercial Grade Industrial Grade AV = 1V/V AV = 1V/V
q
q q
GBW SR VCM
Gain Bandwidth Slew Rate Input Common Mode Range
12 8
q
VSS
VCC - 1.3
V
4
LTC1541
ELECTRICAL CHARACTERISTICS
SYMBOL CMRR PARAMETER Common Mode Rejection Ratio CONDITIONS
VCC = 3V, VSS = 0V, TA = 25C, unless otherwise noted.
MIN
q q
TYP
MAX 0.35 0.52 1.30 1.00 0.19 0.21 0.23
UNITS mV/V mV/V mV/V mV/V mV/V mV/V mV/V V/mV V/mV V/mV
VCM = 0.15V to VCC - 1.3V Commercial Grade Industrial Grade VCM = VSS to VCC - 1.3V VCC = 3V to 12V Commercial Grade Industrial Grade RLOAD = 100k to VSS Commercial Grade Industrial Grade RLOAD = 100k to VCC Commercial Grade Industrial Grade
0.3
q q q q q q q
PSRR
Power Supply Rejection Ratio
VOH
Output High Voltage
VCC - 0.05 VCC - 0.10 VCC - 0.12 VCC + 0.05 VCC + 0.10 VCC + 0.12 0.6 0.4 1.2 0.8 0.95 1.8 3
VOL
Output Low Voltage
V/mV V/mV V/mV mA mA mA mA VP-P
ISOURCE ISINK en
Output Source Current Output Sink Current
q
Input Noise Voltage
fO = 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). Note 2: Input offset voltage is defined as the center of the input referred hysteresis, VCM = REF.
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, VCM = REF. Note 4: The input leakage current is measured for COMPIN+ at 1.5V.
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. AMPIN- (Pin 2): Inverting Input of Op Amp. The input common mode ranges from VSS to VCC - 1.3V. The input current is typically 10pA at 25C. AMPIN+ (Pin 3): Noninverting Input of Op Amp. The input common mode ranges from VSS to VCC - 1.3V. The input current is typically 10pA at 25C. VSS (Pin 4): Negative Supply or Ground Connection. COMPIN+ (Pin 5): Noninverting Input of Comparator. The input common mode ranges from VSS to VCC - 1.3V. The input current is typically 10pA at 25C. REF (Pin 6): Reference Output. VREF = 1.2V 1% over industrial temperature range, and is also connected to inverting comparator input internally. This device can source up to 2mA and sink up to 20A. The output can drive a bypass capacitor of up to 0.01F without oscillation. COMPOUT (Pin 7): Comparator Output. The output can source 20mA and sink 5mA. VCC (Pin 8): Positive Supply, 2.5V VCC 12.6V. The supply bypass capacitors are not required if the supply impedance is low. For single supply applications, it is a good general practice to bypass VCC with a 0.1F capacitor to ground.
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LTC1541
BLOCK DIAGRAMS
LTC1541
APPLICATIONS INFORMATION
The LTC1541 is a combination of a micropower op amp, comparator and 1.2V 1% reference 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 5A (typical) with a 5V single supply. Op Amp 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.
8 LTC1541 VCC
6
REF
x1
R1 C1 GND 4
LTC1541 * F01
Figure 1. Damping the Reference Output
6
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W
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+
1 AMPOUT OP AMP
VCC COMPOUT
8 7
-
2 AMPIN - 3 AMPIN + x1 COMP REF 6
- +
COMPIN + 5
4 VSS
LTC1541 * BD
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Comparator The comparator has a high impedance differential input stage with a common 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, an 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. Reference The internal bandgap reference has an output voltage of 1.2V 1% in the industrial grade temperature range. The output can source up to 2mA and sink up to 20A with a 5V supply. The output can drive a bypass capacitor of up to 0.01F without oscillation and by inserting a series resistor, capacitance values up to 100F 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 VCC or reference load transients from disturbing the reference output voltage. Figures 3a and 3b show the bypass reference output with a square wave applied to the VCC pin while resistor R1 damps the reference response. Note that the comparator output doesn't trip.
LTC1541
APPLICATIONS INFORMATION
1000
RESISTOR VALUE (k)
100
10
1
0.1 0.001
0.01 0.1 1 CAPACITOR VALUE (F)
10
LTC1541 * F02
Figure 2. Damping Resistance vs Bypass Capacitor Value
8 VCC 7 COMPOUT 6 REF
LTC1541
5V TO 8V
x1
R1 430
-
C1 1F 5 COMPIN + COMP
+
GND 4
LTC1541 * F03a
Figure 3a. Reference Transient Response Test Circuit
8V V+ 5V 2mV/DIV
VREF R1 2pF TO 10pF
OUT
2ms/DIV
LTC1541 * F03b
Figure 3b. Reference and Comparator Output Transient Response
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Op Amp Stability Unlike other industry standard micropower CMOS op amps, the op amp in the LTC1541 maintains stability in unity-gain configuration while driving heavy capacitive loads of up to 1000pF. Although this family is primarily designed for low frequency applications, good layout is extremely important. Low power, high impedance circuits may increase the effects of board leakage and stray capacitance. For example, the combination of a 10M resistance (from leakage between traces on a contaminated, poorly designed PC board) and a 2pF stray capacitance provides a pole at approximately 8kHz, which is near the amplifier's 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. Inputs The input common mode range for both the op amp and comparator is from the negative supply to within 1.3V of the 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 the bipolar input op amp and comparator, the output of the LTC1541 will not reverse phase when the inputs are taken above the common mode input range.
AMPIN +
+
OP AMP AMPOUT
-
R2
LTC1541 * F04
Figure 4. Compensation for Feedback Node Capacitance
7
LTC1541
PACKAGE DESCRIPTION
0.007 (0.18) 0.021 0.004 (0.53 0.01)
0 - 6 TYP SEATING PLANE 0.192 0.004 (4.88 0.10) 0.025 (0.65) TYP 1 23 4 0.118 0.004** (3.00 0.10)
* 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
0.010 - 0.020 x 45 (0.254 - 0.508) 0.008 - 0.010 (0.203 - 0.254) 0- 8 TYP
0.053 - 0.069 (1.346 - 1.752)
0.016 - 0.050 0.406 - 1.270
*DIMENSION DOES NOT INCLUDE MOLD FLASH. MOLD FLASH SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE **DIMENSION DOES NOT INCLUDE INTERLEAD FLASH. INTERLEAD FLASH SHALL NOT EXCEED 0.010" (0.254mm) PER SIDE
RELATED PARTS
PART NUMBER LT(R) 1078/LT1079 LT1178/LT1179 LT1490/LT1491 LT1635 LT2078/LT2079 LT2178/LT2179 COMMENTS 70V, VOS Max and 0.4V/C Drift, 200kHz GBW, 0.07V/s Slew Rate, Input/Output Common Mode Includes Ground Dual/Quad 17A Max, Single Supply Precision Op Amps 70V, VOS Max and 2.5V/C Drift Max, 85kHz GBW, 0.04V/s Slew Rate, Input/Output Common Mode Includes Ground Dual/Quad Micropower Rail-to-Rail Input and Output Op Amps Single Supply Input Range: - 0.4V to 44V, Micropower 50A Amplifier, Rail-to-Rail Input and Output, 200kHz GBW Micropower Rail-to-Rail Op Amp and Reference 130A of Supply Current, 1.3mV VOS Max Dual/Quad Micropower, Single Supply Precision Op Amps SO-8 and 14-Lead Standard Pinout, 70V VOS Max, 200kHz GBW Dual/Quad 17A Max, Single Supply Precision Op Amps SO-8 and 14-Lead Standard Pinout, 70V VOS Max, 85kHz GBW DESCRIPTION Dual/Quad Micropower, Single Supply Precision Op Amps
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Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417 q (408) 432-1900 FAX: (408) 434-0507 q TELEX: 499-3977 q www.linear-tech.com
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Dimensions in inches (millimeters) unless otherwise noted. MS8 Package 8-Lead Plastic MSOP
(LTC DWG # 05-08-1660)
0.118 0.004* (3.00 0.10) 0.040 0.006 (1.02 0.15) 0.006 0.004 (0.15 0.10) 8 76 5
0.012 (0.30)
MSOP08 0596
S8 Package 8-Lead Plastic Small Outline (Narrow 0.150)
(LTC DWG # 05-08-1610)
0.189 - 0.197* (4.801 - 5.004) 8 0.004 - 0.010 (0.101 - 0.254) 0.228 - 0.244 (5.791 - 6.197) 0.150 - 0.157** (3.810 - 3.988) 7 6 5
0.014 - 0.019 (0.355 - 0.483)
0.050 (1.270) BSC
SO8 0695
1
2
3
4
1541i LT/TP 0198 4K * PRINTED IN USA
(c) LINEAR TECHNOLOGY CORPORATION 1998

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