LTC1541/LTC1542 Micropower Op Amp, Comparator and Reference U FEATURES ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ DESCRIPTION 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 Daisy-Chained Control Outputs Pin Compatible Upgrade for MAX951/MAX953 The LTC®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 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. U APPLICATIONS ■ ■ ■ ■ ■ ■ 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. 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 Total of 839 Units VIN = 3.6V TO 9V 1k – + 10k 100k 1N457 10M 50 3 + 8 1 2.2µF 1/2 LTC1541 2 – ICC = 7µA AT VIN = 5V 5 1M + 1/2 LTC1541 6 7 LOW BATTERY – 2M 10k 40 2N3904 SCR LOAD 2M VN2222 VCC = 5V VSS = 0V OUTPUT HIGH = “ON” OUTPUT LOW = “OFF” PERCENT OF UNITS (%) 1N457 TYPE R 30 20 10 1.2V INTERNAL REFERENCE 1541/42 • TA01 0 –600 0 300 –300 INPUT OFFSET VOLTAGE (µV) 600 1541/42 TA02 1 LTC1541/LTC1542 W W U W 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 W U U PACKAGE/ORDER I FOR ATIO ORDER PART NUMBER TOP VIEW AMPOUT AMPIN – AMPIN+ VSS 1 2 3 4 8 7 6 5 VCC COMPOUT REF COMPIN + LTC1541CMS8 MS8 PACKAGE 8-LEAD PLASTIC MSOP MS8 PART MARKING TJMAX = 125°C, θJA = 250°C/W LTBE ORDER PART NUMBER TOP VIEW AMPOUT 1 AMPIN– 8 VCC 2 7 COMPOUT AMPIN+ 3 6 REF VSS 4 5 COMPIN + LTC1541CS8 LTC1541IS8 S8 PART MARKING S8 PACKAGE 8-LEAD PLASTIC SO 1541 1541I TJMAX = 125°C, θJA = 150°C/W ORDER PART NUMBER TOP VIEW AMPOUT AMPIN – AMPIN+ VSS 1 2 3 4 8 7 6 5 VCC COMPOUT COMPIN – COMPIN + LTC1542CMS8 MS8 PACKAGE 8-LEAD PLASTIC MSOP MS8 PART MARKING TJMAX = 125°C, θJA = 250°C/W LTDE ORDER PART NUMBER TOP VIEW AMPOUT 1 AMPIN– 8 VCC 2 7 COMPOUT AMPIN+ 3 6 COMPIN – VSS 4 5 COMPIN + LTC1542CS8 LTC1542IS8 S8 PART MARKING S8 PACKAGE 8-LEAD PLASTIC SO 1542 1542I TJMAX = 125°C, θJA = 150°C/W Consult factory for Military grade parts. ELECTRICAL CHARACTERISTICS SYMBOL PARAMETER VCC = 5V, VSS = 0V, TA = 25°C, unless otherwise noted. CONDITIONS MIN TYP MAX UNITS Power Supply VCC Supply Voltage Range ICC Supply Current (Note 1) ● 2.5 5 12.6 V µA µA µA Commercial Grade Industrial Grade ● ● 7.5 13 14 (SO-8) Commercial Grade (SO-8) Industrial Grade (SO-8) ● ● 1 1.5 2.0 mV mV mV ● 1.2 2.0 mV mV 2.8 3.8 mV mV Comparator VOS Input Offset Voltage (Note 2) (MSOP) VTRIP Trip Point (Note 3) ● 2 1.7 1 2.25 LTC1541/LTC1542 ELECTRICAL CHARACTERISTICS VCC = 5V, VSS = 0V, TA = 25°C, unless otherwise noted. SYMBOL PARAMETER IIN Input Leakage Current (Note 4) ● VCM Input Common Mode Range ● CMRR Common Mode Rejection Ratio PSRR Power Supply Rejection Ratio CONDITIONS MIN TYP MAX 0.01 1 nA VCC – 1.3V V VSS UNITS VCM = VSS to (VCC – 1.3V) (LTC1542) Commercial Grade Industrial Grade ● ● 0.25 0.30 0.35 mV/V mV/V mV/V VCC = 3V to 12V Commercial Grade (SO-8) Industrial Grade (SO-8) ● ● 0.25 0.30 0.35 mV/V mV/V mV/V tPD Propagation Delay Overdrive = 10mV Overdrive = 100mV VOH Output High Voltage IOUT = – 2mA ● VCC – 0.2V VOL Output Low Voltage IOUT = 1.8mA ● No Load (SO-8) Commercial Grade (SO-8) Industrial Grade (SO-8) ● ● 1.195 1.190 1.188 ● 1.190 1.185 µs µs 20 8 V VSS + 0.3V V 1.200 1.205 1.210 1.212 V V V 1.200 1.210 1.215 V V 2 0.2 6 1.5 5 Reference (LTC1541 Only) VREF Reference Voltage No Load (MSOP) ∆VREF Load Regulation ISOURCE = 2mA ISINK = 10µA ● ● en Voltage Noise 0.1Hz to 10Hz Input Offset Voltage VCM = 2.5V (SO-8) Commercial Grade (SO-8) Industrial Grade (SO-8) mV mV mV µVP-P 16 Op Amp VOS ● ● 0.7 1.25 1.65 mV mV mV ● 1.00 1.75 mV mV 1 nA VCM = 2.5V (MSOP) IB Input Bias Current VCM = 2.5V AVOL Large-Signal Gain AMPOUT = 0.5V to 4.5V, No Load AMPOUT = 0.5V to 4.5V, RLOAD = 100k Commercial Grade Industrial Grade 0.01 ● ● ● 80 60 38 35 1000 500 V/mV V/mV V/mV V/mV GBW Gain Bandwidth AV = 1V/V 12 kHz SR Slew Rate AV = 1V/V 8 V/ms VCM Input Common Mode Range CMRR Common Mode Rejection Ratio PSRR VOH VOL Power Supply Rejection Ratio Output High Voltage Output Low Voltage ● VSS VCC – 1.3V V VCM = VSS to (VCC – 1.3V) Commercial Grade Industrial Grade ● ● 0.28 0.33 0.38 mV/V mV/V mV/V VCC = 3V to 12V Commercial Grade Industrial Grade ● ● 0.19 0.21 0.23 mV/V mV/V mV/V RLOAD = 100k to VSS Commercial Grade Industrial Grade ● ● RLOAD = 100k to VSS Commercial Grade Industrial Grade ● ● VCC – 0.07 VCC – 0.10 VCC – 0.12 V V V VSS + 0.05 VSS + 0.10 VSS + 0.12 V V V 3 LTC1541/LTC1542 ELECTRICAL CHARACTERISTICS SYMBOL PARAMETER ISOURCE Output Source Current ISINK en VCC = 5V, VSS = 0V, TA = 25°C, unless otherwise noted. CONDITIONS MIN TYP 0.9 0.7 1.8 ● mA mA 1.3 0.9 1.8 ● mA mA Output Sink Current Input Noise Voltage fO = 0.1Hz to 10Hz MAX UNITS µVP-P 3 VCC = 3V, VSS = 0V, TA = 25°C, unless otherwise noted. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS 12.6 V Power Supply VCC Supply Voltage Range ICC Supply Current (Note 1) ● 2.5 Commercial Grade Industrial Grade ● ● 7.0 12 13 µA µA µA (SO-8) Commercial Grade (SO-8) Industrial Grade (SO-8) ● ● 1.0 1.5 2.0 mV mV mV ● 1.2 2.0 mV mV 2.35 2.90 3.90 mV mV 0.01 1 nA 4.5 Comparator VOS Input Offset Voltage (Note 2) (MSOP) VTRIP Trip Point (Note 3) ● IIN Input Leakage Current (Note 4) VCM Input Common Mode Range CMRR Common Mode Rejection Ratio PSRR Power Supply Rejection Ratio 1.80 1.00 ● ● VCM = VSS to (VCC – 1.3V) (LTC1542) Commercial Grade Industrial Grade VCC = 3V to 12V Commercial Grade Industrial Grade VSS VCC – 1.3 V ● ● 0.35 0.40 0.45 mV/V mV/V mV/V ● ● 0.25 0.30 0.35 mV/V mV/V mV/V tPD Propagation Delay Overdrive = 10mV Overdrive = 100mV VOH Output High Voltage IOUT = – 2mA ● VOL Output Low Voltage IOUT = 1.8mA ● No Load (SO-8) Commercial Grade (SO-8) Industrial Grade (SO-8) ● ● 1.195 1.190 1.188 ● 1.190 1.185 µs µs 25 12 VCC – 0.2 V VSS + 0.3 V 1.200 1.205 1.210 1.212 V V V 1.200 1.210 1.215 V V 2 0.2 6 1.5 5 Reference (LTC1541 Only) VREF Reference Voltage No Load (MSOP) ∆VREF Load Regulation ISOURCE = 1mA ISINK = 10µA en Voltage Noise 0.1Hz to 10Hz ● ● 4 16 mV mV mV µVP-P LTC1541/LTC1542 ELECTRICAL CHARACTERISTICS SYMBOL VCC = 3V, VSS = 0V, TA = 25°C, unless otherwise noted. PARAMETER CONDITIONS Input Offset Voltage VCM = 1.5V (SO-8) Commercial Grade (SO-8) Industrial Grade (SO-8) MIN TYP MAX UNITS ● ● 0.70 1.25 1.65 mV mV mV ● 1.00 1.75 mV mV Op Amp VOS VCM = 1.5V (MSOP) IB Input Bias Current VCM = 1.5V AVOL Large-Signal Gain AMPOUT = 0.5V to 2.5V, No Load AMPOUT = 0.5V to 2.5V, RLOAD = 100k Commercial Grade Industrial Grade GBW Gain Bandwidth AV = 1V/V SR Slew Rate AV = 1V/V VCM Input Common Mode Range CMRR Common Mode Rejection Ratio PSRR VOH VOL ISOURCE ISINK en Power Supply Rejection Ratio Output High Voltage Output Low Voltage ● ● 80.0 45.5 22.0 20.0 1 1000 500 kHz 8 ● VSS nA V/mV V/mV V/mV V/mV 12 V/ms VCC – 1.3 V VCM = VSS to (VCC – 1.3V) Commercial Grade Industrial Grade ● ● 0.40 0.50 1.00 mV/V mV/V mV/V VCC = 3V to 12V Commercial Grade Industrial Grade ● ● 0.19 0.21 0.23 mV/V mV/V mV/V RLOAD = 100k to VSS Commercial Grade Industrial Grade ● ● RLOAD = 100k to VCC Commercial Grade Industrial Grade ● ● Output Source Current fO = 0.1Hz to 10Hz The ● 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). VCC – 0.07 VCC – 0.10 VCC – 0.12 V V V VCC + 0.05 VCC + 0.10 VCC + 0.12 V V V 0.6 0.4 0.95 ● mA mA 1.2 0.8 1.8 ● mA mA Output Sink Current Input Noise Voltage 0.01 ● 3 µVP-P 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 U W TYPICAL PERFOR A CE CHARACTERISTICS Supply Current vs Supply Voltage 10 VCC = 5V VSS = GND AMPIN – = AMPOUT AMPIN + = 2.5V SUPPLY CURRENT (µA) 9 7 6 5 4 3 2 8 7 6 5 4 1 3 0 2 –50 3 4 5 6 7 8 9 10 11 12 SUPPLY VOLTAGE (V) 1.203 1.201 1.200 1.199 1.198 1.196 0 25 50 75 TEMPERATURE (°C) 100 1 125 100 1000 10 LOAD CURRENT (µA) Op Amp Output Voltage vs Load Current Op Amp DC Open-Loop Gain vs Temperature 1x106 VCC = 5V VSS = GND 1 VSUPPLY = ±1.5V DC OPEN-LOOP GAIN (V/V) 0.8 1.200 1.199 1.198 1.197 1x10 5 0.6 1x104 1x103 VCC = 5V VSS = GND RLOAD = 100kΩ 1x102 1.196 100 –50 125 0.4 VSUPPLY = ± 2.5V SINKING CURRENT 0.2 0 SOURCING CURRENT –0.2 VSUPPLY = ± 2.5V –0.4 –0.6 –0.8 VSUPPLY = ±1.5V –1 1x101 0 25 50 75 TEMPERATURE (°C) –25 0 25 50 75 TEMPERATURE (°C) 100 1 125 100 1000 10 LOAD CURRENT (µA) 1541/42 TPC05 Op Amp Short-Circuit Current vs Supply Voltage Op Amp DC Open-Loop Gain vs Supply Voltage 5 RLOAD = 100kΩ 4 2 0 –2 SHORT TO VCC –4 NONINVERTING VSS = GND AMPIN+ = VCC /2 –6 –8 1000 100 10 1 0.1 –10 2 3 4 5 6 7 8 9 10 11 12 SUPPLY VOLTAGE (V) 4 OUTPUT VOLTAGE (V) OUTPUT CURRENT (mA) SHORT TO VSS DC OPEN-LOOP GAIN (V/mV) 8 VCC = 5V VSS = GND SOURCING CURRENT 3 2 SINKING CURRENT 1 2 3 4 5 6 7 8 9 10 11 12 SUPPLY VOLTAGE (V) 1541/42 TPC08 1541/42 TPC07 6 Comparator Output Voltage vs Load Current 10,000 6 10000 1541/42 TPC06 1541/42 TPC04 10 10000 1541/42 TPC03 1.202 –25 SINKING CURRENT 1.197 1541/42 TPC02 Reference Output Voltage vs Temperature 1.195 –50 SOURCING CURRENT 1.202 1.195 –25 1541/42 TPC01 1.201 VCC = 5V VSS = GND 1.204 OUTPUT VOLTAGE (mV) 2 REFERENCE OUTPUT VOLTAGE (V) NONINVERTING VSS = GND AMPIN+ = VCC /2 8 SUPPLY CURRENT (µA) 1.205 10 9 REFERENCE OUTPUT (V) Reference Output Voltage vs Load Current Supply Current vs Temperature 0 0.01 0.1 1 10 100 LOAD CURRENT (mA) 1000 1541/42 TPC09 LTC1541/LTC1542 U W TYPICAL PERFOR A CE CHARACTERISTICS Comparator Short-Circuit Current vs Supply Voltage Op Amp Small-Signal Transient Response 250 SHORT-CIRCUIT CURRENT (mA) 200 150 SHORT TO VSS INPUT 200mV/DIV 100 50 OUTPUT 100mV/DIV 0 –50 –100 SHORT TO VCC –150 NONINVERTING AVCL = 1V/V LOAD = 100kΩ//100pF TO VSS VSUPPLY = 5V –200 –250 2 3 4 5 6 7 8 9 10 11 12 SUPPLY VOLTAGE (V) 1541/42 TPC11 1541/42 TPC10 Op Amp Large-Signal Transient Response Op Amp Open-Loop Gain and Phase vs Frequency OUTPUT 1V/DIV NONINVERTING AVCL = 1V/V LOAD = 100kΩ//100pF TO VSS VSUPPLY = 5V 1541/42 TPC11 0 100 –45 –90 80 PHASE –135 60 –180 40 GAIN –225 20 0 –20 –40 –270 VCC = 5V VSS = GND RLOAD = 100kΩ 10 100 1k 10k FREQUENCY (Hz) PHASE SHIFT (DEGREES) OPEN-LOOP GAIN (dB) INPUT 2V/DIV 120 –315 100k –360 1M 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 common mode ranges from VSS to (VCC – 1.3V). The input current is typically 10pA at 25°C. 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 20µA. The output can drive a bypass capacitor of up to 0.01µF without oscillation. 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 25°C. 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 25°C. VSS (Pin 4): Negative Supply or Ground Connection. COMPOUT (Pin 7): Comparator Output. The output can source 20mA and sink 5mA. 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 25°C. 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 0.1µF capacitor to ground. W BLOCK DIAGRA S LTC1541 + 1 AMPOUT OP AMP VCC 8 COMPOUT 7 REF 6 COMPIN + 5 – 2 AMPIN – ×1 3 AMPIN + COMP – 4 VSS + LTC1541 • BD LTC1542 + 1 AMPOUT OP AMP VCC 8 COMPOUT 7 COMPIN – 6 COMPIN+ 5 – 2 AMPIN – COMP 3 AMPIN + – 4 VSS + LTC1542 • BD 8 LTC1541/LTC1542 U U W U 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 5µA (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 ×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. Reference 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 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. The internal bandgap reference has an output voltage of 1.2V ±1% over the industrial grade temperature range. 9 LTC1541/LTC1542 U U W U APPLICATIONS INFORMATION 1000 LTC1541 RESISTOR VALUE (kΩ) 8 VCC 100 7 COMPOUT 5V TO 8V 6 REF ×1 10 R1 430Ω – 1 0.1 0.001 0.01 0.1 1 CAPACITOR VALUE (µF) C1 1µF 10 5 COMP COMPIN + + GND 4 1541/42 • F02 Figure 2. Damping Resistance vs Bypass Capacitor Value 1541/42 • F03a Figure 3a. Reference Transient Response Test Circuit 8V V+ AMPIN + 2mV/DIV 5V + OP AMP VREF AMPOUT – R2 OUT R1 2ms/DIV 2pF TO 10pF 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 6.8V ZENER 1N754 3.65M 1A SOLAR ARRAY 3 + 1/2 LTC1541 2 340k – TIP121 8 7.5Ω 10W DALE HLM-10 1M 8M 1M 5 1 12V 5AHR GEL CELL 6 4 + 1/2 LTC1541 7 LOAD VN2222 – 1M VREF = 1.2V (INTERNAL) 1541/42 TA06 10 LTC1541/LTC1542 U TYPICAL APPLICATIO S Negative Reference Sungle Supply Function Generator VCC 3V TO 9V VCC 3V TO 12V 0.1µF 200k 5M 2 2 3 – 8 LTC1542 OP AMP + LT1634-2.5 1 – 3 + 4 VSS –3V 1 LTC1542 OP AMP 5M VOUT –2.5V 8 4 R2 500k 6 5 R1 10M – 7 LTC1542 COMP + R3 5M 1541/42 TA04 1541/42 TA05 FREQ ≈ U PACKAGE DESCRIPTION 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) 0.007 (0.18) 0.006 ± 0.004 (0.15 ± 0.10) 8 7 6 5 0° – 6° TYP SEATING PLANE 0.021 ± 0.004 (0.53 ± 0.01) 0.118 ± 0.004** (3.00 ± 0.10) 0.192 ± 0.004 (4.88 ± 0.10) 0.012 (0.30) 0.025 (0.65) TYP MSOP08 0596 1 * 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 2 3 4 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 × 45° (0.254 – 0.508) 0.008 – 0.010 (0.203 – 0.254) 0.053 – 0.069 (1.346 – 1.752) 0°– 8° TYP 0.016 – 0.050 0.406 – 1.270 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 **DIMENSION DOES NOT INCLUDE INTERLEAD FLASH. INTERLEAD FLASH SHALL NOT EXCEED 0.010" (0.254mm) PER SIDE 8 7 6 5 0.004 – 0.010 (0.101 – 0.254) 0.050 (1.270) BSC 0.150 – 0.157** (3.810 – 3.988) 0.228 – 0.244 (5.791 – 6.197) SO8 0695 1 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. 2 3 4 11 LTC1541/LTC1542 U TYPICAL APPLICATIO S Voltage Control Oscillator C1 0.047µF VCC R1 300k 2 1M VIN 0V – VCC 3 R2 150k – 8 LTC1542 OP AMP + R4 5M 1 6 4 5 1M VC 2.4C • R1 • VCC VALUES SHOWN ARE FOR 100Hz WITH VIN = VCC – LTC1542 COMP 7 5V 0V VOUT + FREQ ≈ R4 1.1M VN2222 R3 500k VN2222 1541/42 TA03 Linear Lithium-Ion Charger D1 1N5817 Q1 FZT2907A VIN 6V 300mA C3 0.01µF R1 220Ω 0.25W R8 249k 0.5% IC1 VCC 8 LTC1541 Q2 2N3906 ×1 2 R1 1M SHUTDOWN 7 1 3 – – + + 300mA 4.2V FLOAT 6 Li-ION 5 C2 0.1µF 4 VSS R3 3.83k 1% R5 2.2M R4 100k 1% C1 4700pF R7 0.15Ω R6 33k R9 100k 0.5% 1541/42 TA07 RELATED PARTS PART NUMBER LT® 1078/LT1079 LT1178/LT1179 LT1490/LT1491 LT1635 LT2078/LT2079 LT2178/LT2179 12 DESCRIPTION Dual/Quad Micropower, Single Supply Precision Op Amps COMMENTS 70µV, VOS Max and 0.4µV/°C Drift, 200kHz GBW, 0.07V/µs Slew Rate, Input/Output Common Mode Includes Ground Dual/Quad 17µA Max, Single Supply Precision Op Amps 70µV, VOS Max and 2.5µV/°C Drift Max, 85kHz GBW, 0.04V/µs 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 50µA Amplifier, Rail-to-Rail Input and Output, 200kHz GBW Micropower Rail-to-Rail Op Amp and Reference 130µA of Supply Current, 1.3mV VOS Max Dual/Quad Micropower, Single Supply Precision Op Amps SO-8 and 14-Lead Standard Pinout, 70µV VOS Max, 200kHz GBW Dual/Quad 17µA Max, Single Supply Precision Op Amps SO-8 and 14-Lead Standard Pinout, 70µV VOS Max, 85kHz GBW Linear Technology Corporation 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408)432-1900 ● FAX: (408) 434-0507 ● www.linear-tech.com 15412f LT/TP 0798 4K • PRINTED IN USA LINEAR TECHNOLOGY CORPORATION 1998