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LTC1541/LTC1542 Micropower Op Amp, Comparator and Reference
FEATURES
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DESCRIPTION
The LTC(R)1541/LTC1542 combine a micropower amplifier, 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 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 (LTC1541). The reference output voltage is 1.2V 1% over the extended temperature range. The output can drive a bypass capacitor of up to 0.01F 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/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: 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 (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
VIN = 3.6V TO 9V 1N457 TYPE R 1k 100k 1N457 10M
3
10k
2.2F 1/2 LTC1541 2
2N3904 SCR LOAD
-
PERCENT OF UNITS (%)
-
+
+
8 1
OUTPUT HIGH = "ON" OUTPUT LOW = "OFF"
ICC = 7A AT VIN = 5V
2M 5 1M 6 2M 1.2V INTERNAL REFERENCE
1541/42 * TA01
+
1/2 LTC1541 7 LOW BATTERY
-
10k VN2222
U
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Op Amp VOS Distribution, VCM = 2.5V, SO-8 Package Total of 839 Units
50 VCC = 5V VSS = 0V 40
30
20
10
0 -600
0 300 -300 INPUT OFFSET VOLTAGE (V)
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 ................. - 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
TOP VIEW AMPOUT AMPIN - AMPIN+ VSS 1 2 3 4 8 7 6 5 VCC COMPOUT COMPIN - COMPIN +
ORDER PART NUMBER LTC1542CMS8 MS8 PART MARKING LTDE
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
Trip Point (Note 3)
q
2
U
U
W
WW U
W
TOP VIEW AMPOUT 1 AMPIN- 2 8 7 6 5 VCC COMPOUT REF COMPIN +
ORDER PART NUMBER LTC1541CS8 LTC1541IS8 S8 PART MARKING 1541 1541I ORDER PART NUMBER LTC1542CS8 LTC1542IS8 S8 PART MARKING 1542 1542I
AMPIN+ 3 VSS 4
S8 PACKAGE 8-LEAD PLASTIC SO TJMAX = 125C, JA = 150C/W
TOP VIEW AMPOUT 1 AMPIN- 2 8 7 6 5 VCC COMPOUT COMPIN - COMPIN +
AMPIN+ 3 VSS 4
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
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 IIN VCM CMRR PARAMETER Input Leakage Current (Note 4) Input Common Mode Range Common Mode Rejection Ratio CONDITIONS
VCC = 5V, VSS = 0V, TA = 25C, unless otherwise noted.
MIN
q q
TYP 0.01
MAX 1 VCC - 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 s s V
VSS
VCM = VSS to (VCC - 1.3V) (LTC1542) Commercial Grade Industrial Grade VCC = 3V to 12V Commercial Grade (SO-8) Industrial Grade (SO-8) 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
PSRR
Power Supply Rejection Ratio
tPD VOH VOL VREF
Propagation Delay Output High Voltage Output Low Voltage Reference Voltage
20 8
q VCC - 0.2V q
VSS + 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 VP-P
Reference (LTC1541 Only)
q q q
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
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
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
VCC - 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
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
PSRR
Power Supply Rejection Ratio
VOH
Output High Voltage
VCC - 0.07 VCC - 0.10 VCC - 0.12 VSS + 0.05 VSS + 0.10 VSS + 0.12
VOL
Output Low Voltage
V V V
3
LTC1541/LTC1542
ELECTRICAL CHARACTERISTICS
SYMBOL ISOURCE ISINK en PARAMETER Output Source Current
q
VCC = 5V, VSS = 0V, TA = 25C, unless otherwise noted.
MIN 0.9 0.7 1.3 0.9 TYP 1.8 1.8 3 MAX UNITS mA mA mA mA VP-P
CONDITIONS
Output Sink Current
q
Input Noise Voltage
fO = 0.1Hz to 10Hz
VCC = 3V, VSS = 0V, TA = 25C, unless otherwise noted.
SYMBOL Power Supply VCC ICC Supply Voltage Range Supply Current (Note 1) Commercial Grade Industrial Grade Comparator VOS 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 A A A mV mV mV mV mV mV mV nA V mV/V mV/V mV/V mV/V mV/V mV/V s s V
4.5
7.0 12 13 1.0 1.5 2.0 1.2 2.0
VTRIP IIN VCM CMRR
Trip Point (Note 3)
q
1.80 1.00 VSS
2.35 0.01
2.90 3.90 1 VCC - 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 VCM = VSS to (VCC - 1.3V) (LTC1542) Commercial Grade Industrial Grade 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 q q
PSRR
Power Supply Rejection Ratio
tPD VOH VOL 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
Reference (LTC1541 Only)
q q q
1.200 2 0.2 16
VREF
Load Regulation
ISOURCE = 1mA ISINK = 10A 0.1Hz to 10Hz
q q
en
Voltage Noise
4
LTC1541/LTC1542
ELECTRICAL CHARACTERISTICS
SYMBOL Op Amp VOS Input Offset Voltage PARAMETER CONDITIONS
VCC = 3V, VSS = 0V, TA = 25C, 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 VCC - 1.3 0.40 0.50 1.00 0.19 0.21 0.23 VCC - 0.07 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 V mV/V mV/V mV/V mV/V mV/V mV/V V V V V V V mA mA mA mA VP-P
VCM = 1.5V (SO-8) Commercial Grade (SO-8) Industrial Grade (SO-8) VCM = 1.5V (MSOP)
q q q
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 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 VCC 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
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, VCM = REF (LTC1541). VCM = 1/2 VCC (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, VCM = REF (LTC1541). VCM = 1/2 VCC (LTC1542). Note 4: The input leakage current is measured for COMPIN+ at 1.5V (LTC1541) and COMPIN+ = COMPIN - = 1.5V (LTC1542).
5
LTC1541/LTC1542 TYPICAL PERFOR A CE CHARACTERISTICS
Supply Current vs Supply Voltage
10 9 8 SUPPLY CURRENT (A) 7 6 5 4 3 2 1 0 2 3 4 5 6 7 8 9 10 11 12 SUPPLY VOLTAGE (V)
1541/42 TPC01
REFERENCE OUTPUT VOLTAGE (V)
SUPPLY CURRENT (A)
NONINVERTING VSS = GND AMPIN+ = VCC /2
Reference Output Voltage vs Temperature
1.202 1.201 VCC = 5V VSS = GND DC OPEN-LOOP GAIN (V/V) 1x106
REFERENCE OUTPUT (V)
1.200 1.199 1.198 1.197 1.196 1.195 -50
OUTPUT VOLTAGE (mV)
-25
0 25 50 75 TEMPERATURE (C)
Op Amp Short-Circuit Current vs Supply Voltage
10 8
10,000
DC OPEN-LOOP GAIN (V/mV)
6 OUTPUT CURRENT (mA) 4 2 0 -2 -4 -6 -8 -10 2 3 4 NONINVERTING VSS = GND AMPIN+ = VCC /2
SHORT TO VSS
100
OUTPUT VOLTAGE (V)
SHORT TO VCC
5 6 7 8 9 10 11 12 SUPPLY VOLTAGE (V)
1541/42 TPC07
6
UW
100
1541/42 TPC04
Supply Current vs Temperature
10 9 8 7 6 5 4 3 2 -50 VCC = 5V VSS = GND AMPIN - = AMPOUT AMPIN + = 2.5V 1.205 1.204 1.203 1.202 1.201 1.200 1.199 1.198 1.197 1.196 1.195 -25 0 25 50 75 TEMPERATURE (C) 100 125
Reference Output Voltage vs Load Current
VCC = 5V VSS = GND SOURCING CURRENT
SINKING CURRENT
1
100 1000 10 LOAD CURRENT (A)
10000
1541/42 TPC03
1541/42 TPC02
Op Amp DC Open-Loop Gain vs Temperature
1 0.8
Op Amp Output Voltage vs Load Current
VSUPPLY = 1.5V
1x10
5
0.6 0.4 0.2 0 -0.2 -0.4 -0.6 -0.8 -1 VSUPPLY = 1.5V 1 100 1000 10 LOAD CURRENT (A) 10000
1541/42 TPC06
1x104
SINKING CURRENT SOURCING CURRENT
VSUPPLY = 2.5V
1x103 VCC = 5V VSS = GND RLOAD = 100k -25 0 25 50 75 TEMPERATURE (C) 100 125
VSUPPLY = 2.5V
1x102
1x101 125
-50
1541/42 TPC05
Op Amp DC Open-Loop Gain vs Supply Voltage
5
RLOAD = 100k 1000
Comparator Output Voltage vs Load Current
VCC = 5V VSS = GND SOURCING CURRENT 3
4
10
2
SINKING CURRENT
1
1
0.1
2
3
4
5 6 7 8 9 10 11 12 SUPPLY VOLTAGE (V)
1541/42 TPC08
0 0.01
0.1
1 10 100 LOAD CURRENT (mA)
1000
1541/42 TPC09
LTC1541/LTC1542 TYPICAL PERFOR A CE CHARACTERISTICS
Comparator Short-Circuit Current vs Supply Voltage
250 200
SHORT-CIRCUIT CURRENT (mA)
150 100 50 0 -50 -100 -150 -200 -250 2 3 4
5 6 7 8 9 10 11 12 SUPPLY VOLTAGE (V)
1541/42 TPC10
Op Amp Large-Signal Transient Response
120
INPUT 2V/DIV OPEN-LOOP GAIN (dB)
OUTPUT 1V/DIV
NONINVERTING AVCL = 1V/V LOAD = 100k//100pF TO VSS VSUPPLY = 5V
UW
Op Amp Small-Signal Transient Response
INPUT 200mV/DIV
SHORT TO VSS
OUTPUT 100mV/DIV
SHORT TO VCC NONINVERTING AVCL = 1V/V LOAD = 100k//100pF TO VSS VSUPPLY = 5V
1541/42 TPC11
Op Amp Open-Loop Gain and Phase vs Frequency
0 -45 100 80 PHASE 60 40 GAIN 20 0 -20 -40 10 VCC = 5V VSS = GND RLOAD = 100k 100 1k 10k FREQUENCY (Hz) 100k -225 -270 -315 -360 1M -135 -180
PHASE SHIFT (DEGREES)
-90
1541/42 TPC11
1541/42 TPC13
7
LTC1541/LTC1542
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 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) (LTC1541): 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. COMPIN - (Pin 6) (LTC1542): Inverting Input of Comparator. The input common mode ranges from V SS to (VCC - 1.3V). The input current is typically 10pA at 25C. 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.
BLOCK DIAGRA S
LTC1541 +
1 AMPOUT OP AMP VCC COMPOUT 8 7
8
W
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-
2 AMPIN - 3 AMPIN + x1 COMP REF 6
- +
COMPIN + 5
4 VSS
LTC1541 * BD
LTC1542 +
1 AMPOUT OP AMP VCC COMPOUT 8 7
-
2 AMPIN - COMP 3 AMPIN +
- +
COMPIN -
6
4 VSS
COMPIN+
5
LTC1542 * BD
LTC1541/LTC1542
APPLICATIONS INFORMATION
The LTC1541/LTC1542 are a combination of a micropower 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 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
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. Reference The internal bandgap reference has an output voltage of 1.2V 1% over the industrial grade temperature range.
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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. 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. 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 1pF stray capacitance provides a pole at approximately 16kHz, 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 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.
9
LTC1541/LTC1542
APPLICATIONS INFORMATION
1000
8 VCC 7 COMPOUT 6 REF LTC1541
RESISTOR VALUE (k)
100
10
R1 430
1
5 COMPIN +
0.1 0.001
0.01 0.1 1 CAPACITOR VALUE (F)
10
1541/42 * F02
Figure 2. Damping Resistance vs Bypass Capacitor Value
8V V+ 5V 2mV/DIV AMPIN +
VREF
OUT 2ms/DIV
LTC1541 * F03b
Figure 3b. Reference and Comparator Output Transient Response
TYPICAL APPLICATIO S
Shunt Battery Charger with Low-Battery Load Disconnect
Si9405 2A FUSE
3.65M 1A SOLAR ARRAY 3 8
6.8V ZENER 1N754 TIP121 1
+
1/2 LTC1541 4
2 340k
-
10
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W
U
U
U
5V TO 8V
x1
-
COMP C1 1F
+
GND 4
1541/42 * F03a
Figure 3a. Reference Transient Response Test Circuit
+
OP AMP AMPOUT
-
R2 2pF TO 10pF
R1
1541/42 * F04
Figure 4. Compensation for Feedback Node Capacitance
1M
7.5 10W DALE HLM-10 12V 5AHR GEL CELL
8M 1M 5
+
1/2 LTC1541 7 VN2222
LOAD
6 1M
-
VREF = 1.2V (INTERNAL)
1541/42 TA06
LTC1541/LTC1542
TYPICAL APPLICATIO S
Negative Reference
VCC 3V TO 9V 200k
2
- +
8 1
LT1634-2.5 VOUT -2.5V
3
LTC1542 OP AMP 4 VSS -3V
1541/42 TA05
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
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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Sungle Supply Function Generator
VCC 3V TO 12V 5M 2 5M 3 0.1F
- +
8 1
LTC1542 OP AMP 4
R2 500k
6
- +
LTC1542 COMP 7
R1 10M
5
R3 5M
1541/42 TA04
FREQ
R1 4C * R2 * R3
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
11
LTC1541/LTC1542
TYPICAL APPLICATIO S
Voltage Control Oscillator
C1 0.047F VCC 2
R1 300k
VIN 0V - VCC
VC 2.4C * R1 * VCC VALUES SHOWN ARE FOR 100Hz WITH VIN = VCC FREQ
VIN 6V 300mA
Q1 FZT2907A R1 220 0.25W IC1 LTC1541
Q2 2N3906
R1 1M SHUTDOWN
R3 3.83k 1%
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
15412f LT/TP 0798 4K * PRINTED IN USA
DESCRIPTION Dual/Quad Micropower, Single Supply Precision Op Amps
12
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408)432-1900 q FAX: (408) 434-0507 q www.linear-tech.com
U
1M
- +
8 1
3 R2 150k 1M
LTC1542 OP AMP 4
R4 5M
6
- +
LTC1542 COMP 7
5V 0V VOUT
5
R4 1.1M VN2222 VN2222
R3 500k
1541/42 TA03
Linear Lithium-Ion Charger
D1 1N5817 C3 0.01F R8 249k 0.5%
VCC 8 x1 R5 2.2M 300mA 4.2V FLOAT
1 2
7 6
- +
- +
Li-ION 5
3
4 VSS
C2 0.1F
R4 100k 1%
C1 4700pF
R7 0.15
R6 33k
R9 100k 0.5%
1541/42 TA07
(c) LINEAR TECHNOLOGY CORPORATION 1998

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