LTC1443/LTC1444/LTC1445 Ultralow Power Quad Comparators with Reference Features Description Ultralow Quiescent Current: 8.5µA Max n Reference Output Drives 0.01µF Capacitor n Adjustable Hysteresis (LTC1444/LTC1445) n Wide Supply Range Single: 2V to 11V Dual: ±1V to ±5.5V n Input Voltage Range Includes the Negative Supply n TTL/CMOS Compatible Outputs n Propagation Delay: 12µs (Typ) (10mV Overdrive) n No Crowbar Current n 40mA Continuous Source Current n Pin Compatible Upgrades for MAX924 (LTC1443) n Low Profile (5mm × 4mm × 0.8mm) DFN Package The LTC®1443/LTC1444/LTC1445 are ultralow power quad comparators with a built-in reference. The comparators feature less than 8.5µA supply current over temperature, an internal reference (1.182V ±1% for LTC1443 or 1.221V ±1% for LTC1444/LTC1445), programmable hysteresis (LTC1444/LTC1445) and TTL/CMOS output (LTC1443/ LTC1445) that sinks and sources current (open-drain output for LTC1444). The reference output can drive a bypass capacitor of up to 0.01µF without oscillation. n Applications n n n n Battery-Powered System Monitoring Threshold Detectors Window Comparators Oscillator Circuits L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. The comparators operate from a single 2V to 11V supply or a dual ± 1V to ±5.5V supply (LTC1443). Comparator hysteresis is easily programmable using two resistors and the HYST pin (LTC1444/LTC1445). Each comparator’s input operates from the negative supply to within 1.3V of the positive supply. The LTC1443/LTC1445 comparator output stage can continuously source up to 40mA. By eliminating the cross-conducting current that normally happens when the comparator changes logic states, power supply glitches are eliminated. The LTC1443/LTC1444/LTC1445 are available in the 16-pin SO, PDIP and DFN packages. Typical Application Reference Settling Test Circuit 3 VIN 5V TO 8V 5 IN A+ – 4 IN A 1.21M 1% 8V V+ V+ 5V + 2 – OUT 2mV/DIV 3.4M 1% Reference Settling VREF 14 HYST R1 10k R2 2.4M 8 R3 430Ω C1 1.0µF LTC1445 REF + – 1.2V OUT 2ms/DIV 144345 TA02 V– 9 144345 TA01 144345fe 1 LTC1443/LTC1444/LTC1445 Absolute Maximum Ratings (Note 1) Voltage: V + to V –, V + to GND, GND to V –............ 12V to –0.3V IN +, IN –, HYST...................(V + + 0.3V) to (V – – 0.3V) REF....................................(V + + 0.3V) to (V – – 0.3V) OUT (LTC1443)................(V + + 0.3V) to (GND – 0.3V) OUT (LTC1444/LTC1445).........(V + + 0.3V) to (V – – 0.3V) Current: IN +, IN –, HYST.................................................. 20mA REF.................................................................... 20mA OUT................................................................... 50mA OUT Short-Circuit Duration (V + ≤ 5.5V).........Continuous Power Dissipation............................................... 500mW Operating Temperature Range Commercial..............................................0°C to 70°C Industrial............................................. – 40°C to 85°C Storage Temperature Range PDIP, SO.............................................–65°C to 150°C DFN.....................................................–65°C to 150°C Lead Temperature Range (Soldering, 10 sec) PDIP, SO............................................................300°C Pin Configuration TOP VIEW TOP VIEW OUT B 1 16 OUT C OUT B 1 16 OUT C OUT A 2 15 OUT D OUT A 2 15 OUT D V+ 3 14 GND/HYST† 13 IN D+ IN A– 4 12 IN D– + 5 11 IN C+ – IN B 6 11 IN C+ 7 10 IN C– IN B+ 7 10 IN C– REF 8 9 V– REF 8 9 V+ 3 IN A– 4 IN A+ IN B– IN B+ 5 6 N PACKAGE 16-LEAD PDIP 14 GND/HYST† S PACKAGE 16-LEAD PLASTIC SO TJMAX = 150°C, θJA = 90°C/ W (N) TJMAX = 150°C, θJA = 150°C/ W (S) †PIN 14 IS GND FOR THE LTC1443 †PIN 14 IS HYST FOR THE LTC1444 AND LTC1445 IN A 17 13 IN D+ 12 IN D– V– DHD16 PACKAGE 16-LEAD (5mm × 4mm) PLASTIC DFN TJMAX = 125°C, θJA = 41.7°C/ W EXPOSED PAD (PIN 17) INTERNALLY CONNECTED TO V – †PIN 14 IS GND FOR THE LTC1443 †PIN 14 IS HYST FOR THE LTC1444 AND LTC1445 144345fe 2 LTC1443/LTC1444/LTC1445 Order Information LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION SPECIFIED TEMPERATURE RANGE LTC1443CN#PBF LTC1443CN#TRPBF LTC1443CN 16-Lead PDIP 0°C to 70°C LTC1443CS#PBF LTC1443CS#TRPBF LTC1443CS 16-Lead Plastic SO 0°C to 70°C LTC1443IN#PBF LTC1443IN#TRPBF LTC1443IN 16-Lead PDIP –40°C to 85°C LTC1443IS#PBF LTC1443IS#TRPBF LTC1443IS 16-Lead Plastic SO –40°C to 85°C LTC1444CN#PBF LTC1444CN#TRPBF LTC1444CN 16-Lead PDIP 0°C to 70°C LTC1444CS#PBF LTC1444CS#TRPBF LTC1444CS 16-Lead Plastic SO 0°C to 70°C LTC1444IN#PBF LTC1444IN#TRPBF LTC1444IN 16-Lead PDIP –40°C to 85°C LTC1444IS#PBF LTC1444IS#TRPBF LTC1444IS 16-Lead Plastic SO –40°C to 85°C LTC1445CN#PBF LTC1445CN#TRPBF LTC1445CN 16-Lead PDIP 0°C to 70°C LTC1445CS#PBF LTC1445CS#TRPBF LTC1445CS 16-Lead Plastic SO 0°C to 70°C LTC1445IN#PBF LTC1445IN#TRPBF LTC1445IN 16-Lead PDIP –40°C to 85°C LTC1445IS#PBF LTC1445IS#TRPBF LTC1445IS 16-Lead Plastic SO –40°C to 85°C LTC1443CDHD#PBF LTC1443CDHD#TRPBF 1443 16-Lead (5mm × 4mm) Plastic DFN 0°C to 70°C LTC1443IDHD#PBF LTC1443IDHD#TRPBF 1443 16-Lead (5mm × 4mm) Plastic DFN –40°C to 85°C LTC1444CDHD#PBF LTC1444CDHD#TRPBF 1444 16-Lead (5mm × 4mm) Plastic DFN 0°C to 70°C LTC1444IDHD#PBF LTC1444IDHD#TRPBF 1444 16-Lead (5mm × 4mm) Plastic DFN –40°C to 85°C LTC1445CDHD#PBF LTC1445CDHD#TRPBF 1445 16-Lead (5mm × 4mm) Plastic DFN 0°C to 70°C LTC1445IDHD#PBF LTC1445IDHD#TRPBF 1445 16-Lead (5mm × 4mm) Plastic DFN –40°C to 85°C Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container. Consult LTC Marketing for information on nonstandard lead based finish parts. For more information on lead free part marking, go to: http://www.linear.com/leadfree/ For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/ Electrical Characteristics The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. V+ = 5V, V – = GND = 0V, unless otherwise noted. SYMBOL Power Supply V+ ICC Comparator VOS IIN VCM CMRR PSRR Noise VHYST tPD PARAMETER Supply Voltage Range Supply Current Comparator Input Offset Voltage Input Leakage Current (IN+, IN –) Input Leakage Current (HYST) Comparator Input Common Mode Range Common Mode Rejection Ratio Power Supply Rejection Ratio Voltage Noise Hysteresis Input Voltage Range Propagation Delay CONDITIONS MIN TYP MAX UNITS l 5.5 11.0 8.5 V µA l ±3.0 ±0.01 ±0.02 l IN + = IN – = 80mV HYST = REF (LTC1444/LTC1445) VCM = 2.5V VIN+ = VIN– = 2.5V LTC1444/LTC1445 2.0 l l l V– V – to (V+ – 1.3V) V+ = 2V to 11V 100Hz to 100kHz LTC1444, LTC1445 Overdrive = 10mV, COUT = 100pF Overdrive = 100mV, COUT = 100pF 0.1 0.1 20 l REF – 50mV ±10.0 ±1.0 ±1.0 V+ – 1.3V 1.0 1.0 REF 12 4 mV nA nA V mV/V mV/V µVRMS V µs µs 144345fe 3 LTC1443/LTC1444/LTC1445 Electrical Characteristics The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. V+ = 5V, V – = GND = 0V, unless otherwise noted. SYMBOL VOH VOL PARAMETER Output High Voltage Output Low Voltage CONDITIONS IO = – 15mA; LTC1443/LTC1445 IO = 1.8mA; LTC1443 IO = 1.8mA; LTC1444/LTC1445 Reference VREF Reference Voltage No Load, LTC1443 No Load, LTC1444/ LTC1445 ISOURCE ISINK Reference Output Source Current Reference Output Sink Current Noise Voltage Noise C Temp Range I Temp Range C Temp Range I Temp Range ∆VREF ≤ 1mV ∆VREF ≤ 2.5mV ∆VREF ≤ 5mV 100Hz to 100kHz l MIN V + – 0.4V TYP 1.170 1.164 1.209 1.203 100 10 10 1.182 l l l l l l l l 1.221 MAX UNITS V GND + 0.4V V V – + 0.4V V 1.194 1.200 1.233 1.239 200 15 15 100 V V V V µA µA µA µVRMS The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. V+ = 3V, V – = GND = 0V, unless otherwise noted. SYMBOL Power Supply V+ ICC Comparator VOS IIN PARAMETER CONDITIONS Supply Voltage Range Supply Current IN + = IN – = 80mV, HYST = REF VCM CMRR PSRR Noise VHYST tPD Comparator Input Offset Voltage Input Leakage Current (IN+, IN –) Input Leakage Current (HYST) Comparator Input Common Mode Range Common Mode Rejection Ratio Power Supply Rejection Ratio Voltage Noise Hysteresis Input Voltage Range Propagation Delay VOH VOL Output High Voltage Output Low Voltage Reference VREF Reference Voltage MIN Noise Reference Output Source Current Reference Output Sink Current Noise Voltage MAX UNITS l 5 11.0 8 V µA l ±3.0 ±0.01 ±0.02 ±10.0 ±1.0 ±1.0 + V – 1.3V 1.0 1.0 1.182 1.194 1.200 1.233 1.239 l VCM = 1.5V VIN+ = VIN– = 1.5V LTC1444/LTC1445 l l l V – to (V+ – 1.3V) V+ = 2V to 11V 100Hz to 100kHz LTC1444, LTC1445 Overdrive = 10mV, COUT = 100pF Overdrive = 100mV, COUT = 100pF IO = – 10mA; LTC1443/LTC1445 IO = 0.8mA; LTC1443 IO = 0.8mA; LTC1444/LTC1445 No Load, LTC1443 No Load, LTC1444/ LTC1445 ISOURCE ISINK TYP ∆VREF ≤ 1mV ∆VREF ≤ 2.5mV ∆VREF ≤ 5mV 100Hz to 100kHz Note 1: Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. Exposure to any Absolute C Temp Range I Temp Range C Temp Range I Temp Range l l l l l l l l l l 2.0 mV nA nA – V V 0.1 mV/V 0.1 mV/V 100 µVRMS REF – 50mV REF V 14 µs 5 µs V + – 0.4V V GND + 0.4V V V – + 0.4V V 1.170 1.164 1.209 1.203 60 10 10 1.221 120 15 15 100 V V V V µA µA µA µVRMS Maximum Rating condition for extended periods may affect device reliability and lifetime. 144345fe 4 LTC1443/LTC1444/LTC1445 Typical Performance Characteristics LTC1444/LTC1445 Hysteresis Control Supply Current vs Supply Voltage 5.2 80 60 20 0 –20 –40 4.8 4.6 4.4 4.2 –60 10 0 20 30 VREF – VHYST (mV) 40 4.0 50 1.0 1.186 1.5 2.0 2.5 SUPPLY VOLTAGE (V) 1.212 1.184 1.180 1.178 1.176 1.174 1.170 –60 –40 –20 1.184 0 20 40 60 80 100 120 140 TEMPERATURE (°C) 5 10 15 20 25 30 35 LOAD CURRENT (µA) 40 1.178 45 144345 G07 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 LOAD CURRENT (mA) 144345 G06 Comparator Output Voltage Low vs Load Current 2.5 TA = 25°C V+ = 5V 4.0 3.0 V+ = 3V 2.0 V+ = 2V 1.182 0 1.180 OUTPUT VOLTAGE LOW (V) SINK SOURCE 144345 G05 OUTPUT VOLTAGE HIGH (V) REFERENCE OUTPUT VOLTAGE (V) 1.188 1.180 1.181 1.179 5.0 1.190 1.186 1.182 Comparator Output Voltage High vs Load Current V+ = 5V V– = GND TA = 25°C V+ = 5V V– = GND TA = 25°C 1.183 1.182 LTC1443 Reference Output Voltage vs Output Load Current 1.192 144345 G03 V+ = 5V V– = GND 144345 G04 1.194 0 20 40 60 80 100 120 TEMPERATURE (°C) LTC1443 Reference Output Voltage vs Output Load Current 1.172 0 20 40 60 80 100 120 TEMPERATURE (°C) V+ = 3V V– = 0V 3.8 3.0 –60 –40 –20 3.0 REFERENCE VOLTAGE (V) REFERENCE VOLTAGE (V) REFERENCE VOLTAGE (V) 1.184 1.216 V+ = 5V V– = –5V 4.2 LTC1443 Reference Voltage vs Temperature V+ = 5V 1.208 –60 –40 –20 4.6 144345 G02 LTC1444/LTC1445 Reference Voltage vs Temperature 1.220 V+ = 5V V– = 0V 5.0 3.4 144345 G01 1.224 IN+ = (IN– + 100mV) V – = GND (LTC1443) 5.4 SUPPLY CURRENT (µA) SUPPLY CURRENT (µA) IN+ – IN– (mV) TA = 25°C 5.0 40 –80 Supply Current vs Temperature 5.8 1.0 0 10 20 30 40 LOAD CURRENT (mA) 50 60 144345 G08 TA = 25°C 2.0 1.5 V+ = 2V V+ = 3V V+ = 5V 1.0 0.5 0 0 10 50 60 20 30 40 LOAD CURRENT (mA) 70 80 144345 G09 144345fe 5 LTC1443/LTC1444/LTC1445 Typical Performance Characteristics Comparator Response Time vs Input Overdrive 10mV 50mV 2 20mV 1 0 0 100 –1 0 2 4 6 RESPONSE TIME (µs) 5 8 10 200 TA = 25°C 4 100mV 3 50mV 160 20mV 10mV 2 1 0 140 100 80 60 40 0 20 0 2 OUT CONNECTED TO V+ 120 100 –1 TA = 25°C 180 0 4 6 8 10 12 14 16 18 RESPONSE TIME (µs) 144345 G10 0 1 2 3 4 5 6 7 8 SUPPLY VOLTAGE (V) 9 10 144345 G12 144345 G11 Comparator Response Time vs Load Capacitance Comparator Short-Circuit Source Current vs Supply Voltage 12 160 140 10 RESPONSE TIME (µs) 120 SOURCE CURRENT (mA) Comparator Short-Circuit Sink Current vs Supply Voltage SINK CURRENT (mA) 3 100mV OUTPUT VOLTAGE (V) 4 TA = 25°C INPUT VOLTAGE (mV) INPUT VOLTAGE (mV) OUTPUT VOLTAGE (V) 5 Comparator Response Time vs Input Overdrive OUT CONNECTED TO V– = GND = 0V 100 80 60 40 tPHL 8 tPLH 6 4 20 0 0 1 2 3 SUPPLY VOLTAGE (V) 4 2 5 0 20 60 80 40 LOAD CAPACITANCE (nF) 144345 G14 144345 G13 Supply Current vs Comparator Input Frequency Comparator Response Time at Low Supply Voltage 1000 1000 RESPONSE TIME (µs) 10000 SUPPLY CURRENT (µA) 10000 100 COUT = 55pF COUT = 15pF 10 1 20mV OVERDRIVE 100 10 100mV OVERDRIVE COUT = 5pF 1 1 10 100 1k 10k INPUT FREQUENCY (Hz) 100 100k 1 1.1 1.2 1.3 1.4 1.5 1.6 SUPPLY VOLTAGE (V) 144345 G15 144345 G16 144345fe 6 LTC1443/LTC1444/LTC1445 Pin Functions LTC1443 16 1 OUT B OUT D 15 2 OUT A 14 3 V+ 13 4 IN A– IN D+ 13 12 5 IN A+ IN D– 12 11 6 IN B – IN C+ 11 IN B+ IN C– 10 OUT B 2 OUT A 3 V+ 4 IN A– IN D+ 5 IN A+ IN D– 6 IN B – IN C+ IN B+ IN C– GND – – 7 8 + – + REF – 1.2V +– LTC1444/LTC1445 OUT C 1 + – V– 10 9 7 8 REF 16 15 HYST – + OUT C OUT D + – + – 1.2V +– 14 + + V– 9 144345 PF OUT B (Pin 1): Comparator B Output. (Open-drain output for LTC1444). Output can source up to 40mA (LTC1443, LTC1445) and sink 5mA. IN C – (Pin10): Inverting Input of Comparator C. Input common mode range from V – to V + – 1.3V. Input current typically 10pA at 25°C. OUT A (Pin 2): Comparator A Output. (Open-drain output for LTC1444). Output can source up to 40mA (LTC1443, LTC1445) and sink 5mA. IN C + (Pin 11): Noninverting Input of Comparator C. Input common mode range from V – to V + – 1.3V. Input current typically 10pA at 25°C. V + (Pin 3): Positive Supply. IN D – (Pin 12): Inverting Input of Comparator D. Input common mode range from V – to V + – 1.3V. Input current typically 10pA at 25°C. IN A – (Pin 4): Inverting Input of Comparator A. Input common mode range from V – to V + – 1.3V. Input current typically 10pA at 25°C. IN A + (Pin 5): Noninverting Input of Comparator A. Input common mode range from V – to V + – 1.3V. Input current typically 10pA at 25°C. IN B – (Pin 6): Inverting Input of Comparator B. Input common mode range from V – to V + – 1.3V. Input current typically 10pA at 25°C. IN B + (Pin 7): Noninverting Input of Comparator B. Input common mode range from V – to V + – 1.3V. Input current typically 10pA at 25°C. REF (Pin 8): Reference Output. With respect to V –. Can source up to 200µA and sink 15µA at 25°C. Drive 0.01µF bypass capacitor without oscillation. V – (Pin 9): Negative Supply. Connect to ground for single supply operation on LTC1443. IN D + (Pin 13): Noninverting Input of Comparator D. Input common mode range from V – to V + – 1.3V. Input current typically 10pA at 25°C. GND (Pin 14): LTC1443 Ground. Connect to V – for single supply operation. HYST (Pin 14): LTC1444/LTC1445 Hysteresis Input. Connect to REF if not used. Input voltage range is from VREF to VREF – 50mV. OUT D (Pin 15): Comparator D Output. (Open-drain output for LTC1444). Output can source up to 40mA (LTC1443, LTC1445) and sink 5mA. OUT C (Pin 16): Comparator C Output. (Open-drain output for LTC1444). Output can source up to 40mA (LTC1443, LTC1445) and sink 5mA. Exposed Pad (Pin 17, DFN Package): This pin is internally connected to V–. Connection is optional, but will improve thermal dissipation. 144345fe 7 LTC1443/LTC1444/LTC1445 Applications Information The LTC1443/LTC1444/LTC1445 is a family of quad micropower comparators with a built-in reference (1.182V for the LTC1443 and 1.221V for the LTC1444/LTC1445). Features include programmable hysteresis (LTC1444/ LTC1445), wide supply voltage range (2V to 11V) and the ability of the reference to drive up to a 0.01µF capacitor without oscillation. The comparator CMOS outputs (LTC1443/ LTC1445) can source up to 40mA while the LTC1444 has an open-drain output to V –. The supply current glitches that normally occur when the comparator output switches states have been eliminated. Voltage Reference The internal bandgap reference has a voltage of 1.182V for LTC1443 or 1.221V for LTC1444/LTC1445 referenced to V –. The reference accuracy is 1.5% from –40°C to 85°C. It can source up to 200µA and sink up to 15µA with a 5V supply. The reference 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). REFERENCE OUTPUT REF Power Supplies Comparator Inputs The comparator inputs can swing from the negative supply (V –) to within 1.3V maximum of the positive supply (V+). The inputs can be forced 300mV below V – or above V + without damage, and the typical input leakage current is only ±10pA. Comparator Outputs The LTC1443 comparator output swings between GND and V + to assure TTL compatibility with a split supply. The LTC1444 and LTC1445 outputs swing between V – and V +. The outputs are capable of sourcing up to 40mA (LTC1443/LTC1445) and sinking up to 5mA while still maintaining microampere quiescent currents. The output stage does not generate crowbar switching currents during transitions which helps minimize parasitic feedback through the supply pins. C1 LTC144X + – 1.2V V– 144345 F01 Figure 1. Damping the Reference Output Figure 2 shows the resistor value required for different capacitor values to achieve critical damping. 1000 RESISTOR VALUE (kΩ) The comparator family operates from a single 2V to 11V supply. The LTC1443 includes a separate ground for the comparator output stage, allowing a split supply ranging from ± 1V to ±5.5V. Connecting V – to GND on the LTC1443 allows single supply operation. If the comparator output is required to source more than 1mA or the supply source impedance is high, V + should be bypassed with a 0.1µF capacitor. R1 100 10 1 0.1 0.001 0.01 0.1 1 CAPACITOR VALUE (µF) 10 144345 F02 Figure 2. Damping Resistance vs Bypass Capacitor Value 144345fe 8 LTC1443/LTC1444/LTC1445 Applications Information Bypassing the reference can help prevent false tripping of the comparators by preventing glitches on the V + or the reference output voltage. Figure 3 shows the bypassed reference output with a square wave applied to the V + pin. Resistors R1 and R2 set 10mV of hysteresis, while R3 damps the reference response. Note that the comparator output doesn’t trip. 3 5V TO 8V V+ 5 IN A+ 4 IN A– + 2 OUT – 14 HYST R1 10k 8 R2 2.4M R3 430Ω LTC1445 REF + – Hysteresis can be added to the LTC1444/LTC1445 by connecting a resistor (R1) between the REF and HYST pins, and a second resistor (R2) from HYST to V – (Figure 4). The difference between the upper and lower threshold voltages or hysteresis voltage band (VHB) is equal to twice the voltage difference between the REF and HYST pins. When more hysteresis is added, the upper threshold increases the same amount as the lower threshold decreases. The maximum voltage allowed between REF and HYST is 50mV, producing a maximum hysteresis voltage band of 100mV. If hysteresis is not wanted, the HYST pin should be shorted to REF. Acceptable values for IREF range from 0.1µA to 5µA. If 2.4M is chosen for R2, then R1(kΩ) = VHB (mV). 1.2V 8 IREF V– 9 C1 1.0µF Hysteresis R1 = REF R1 LTC1445 14 HYST 144345 F03a ( 1.221V – R2 = R2 Figure 3a. V + Glitching Test Circuit VHB (2)(IREF) 9 IREF VHB 2 ) 144345 F04 Figure 4. Programmable Hysteresis 8V V+ 2mV/DIV 5V VREF OUT 2ms/DIV 144345 F03b Figure 3b. V + Glitching Response 144345fe 9 LTC1443/LTC1444/LTC1445 Applications Information Level Detector The LTC1444 is ideal for use as a multisupply micropower level detector as shown in Figure 5. R1 and R2 form a voltage divider from V1 to the noninverting comparator A input. R6 and R7 are used to divide down V2, while R8 is the output pull-up resistor for the comparator outputs. R3 and R4 set the hysteresis voltage and R5 and C1 bypass the reference output. 5V 3 V2 V+ R6 1.82M 1% 7 IN B+ – 6 IN B V1 R2 3.40M 1% + OUT B 1 – 1/2LTC1444 5 IN A+ R7 1.21M 1% – 4 IN A R1 1.21M 1% R8 2M 1% + OUT A 2 – 14 HYST R3 15k, 1% R4 2.4M 1% 8 R5 430Ω 5% C1 1.0µF REF + – 1.2V V– 9 144345 F05 Figure 5. Glitch-Free Level Detector with Hysteresis The following design procedure can be used to select the component values: 1. Choose the V1 voltage trip level, in this example 4.65V. 2. Calculate the required resistive divider ratio. Ratio = VREF/ VIN Ratio = 1.221V/4.65V = 0.263 3. Choose the required hysteresis voltage band at the input, VHBIN, in this example 60mV. Calculate the hysteresis voltage band referred to the comparator input VHB. VHB = (VHBIN)(Ratio) VHB = (60mV)(0.263) VHB = 15.78mV 4. Choose the values for R3 and R4 to set the hysteresis. R4 = 2.4M R3(kΩ) = VHB = 15k 5. Choose the values for R1 and R2 to set the trip point. R1 = VREF/IBIAS = 1.221V/1µA ≈ 1.21M VIN R2 = (R1) − 1 VREF + VHB 2 4.65V R2 = (1.21M) − 1 1.221V + 15mV 2 R2 = 3.40M Using the same equations, R6 and R7 are 1.82M and 1.21M, respectively, to set the trip level at 3V for V2. 144345fe 10 LTC1443/LTC1444/LTC1445 Package Description N Package 16-Lead PDIP (Narrow .300 Inch) (Reference LTC DWG # 05-08-1510 Rev I) .770* (19.558) MAX 16 15 14 13 12 11 10 9 1 2 3 4 5 6 7 8 .255 ±.015* (6.477 ±0.381) .300 – .325 (7.620 – 8.255) .130 ±.005 (3.302 ±0.127) .020 (0.508) MIN .008 – .015 (0.203 – 0.381) ( +.035 .325 –.015 +0.889 8.255 –0.381 NOTE: 1. DIMENSIONS ARE .045 – .065 (1.143 – 1.651) .065 (1.651) TYP .120 (3.048) MIN ) .018 ±.003 (0.457 ±0.076) .100 (2.54) BSC N16 REV I 0711 INCHES MILLIMETERS *THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS. MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED .010 INCH (0.254mm) S Package 16-Lead Plastic Small Outline (Narrow .150 Inch) (Reference LTC DWG # 05-08-1610 Rev G) .386 – .394 (9.804 – 10.008) NOTE 3 .045 ±.005 .050 BSC 16 N 14 13 12 11 10 9 N .245 MIN .160 ±.005 .150 – .157 (3.810 – 3.988) NOTE 3 .228 – .244 (5.791 – 6.197) 1 .030 ±.005 TYP 15 2 3 N/2 N/2 RECOMMENDED SOLDER PAD LAYOUT .010 – .020 × 45° (0.254 – 0.508) .008 – .010 (0.203 – 0.254) 1 2 3 4 5 .053 – .069 (1.346 – 1.752) NOTE: 1. DIMENSIONS IN .014 – .019 (0.355 – 0.483) TYP 7 8 .004 – .010 (0.101 – 0.254) 0° – 8° TYP .016 – .050 (0.406 – 1.270) 6 .050 (1.270) BSC S16 REV G 0212 INCHES (MILLIMETERS) 2. DRAWING NOT TO SCALE 3. THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS. MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED .006" (0.15mm) 4. PIN 1 CAN BE BEVEL EDGE OR A DIMPLE 144345fe 11 LTC1443/LTC1444/LTC1445 Package Description DHD Package 16-Lead Plastic DFN (5mm × 4mm) (Reference LTC DWG # 05-08-1707 Rev Ø) 0.70 ±0.05 4.50 ±0.05 3.10 ±0.05 2.44 ±0.05 (2 SIDES) PACKAGE OUTLINE 0.25 ±0.05 0.50 BSC 4.34 ±0.05 (2 SIDES) RECOMMENDED SOLDER PAD PITCH AND DIMENSIONS 5.00 ±0.10 (2 SIDES) R = 0.20 TYP 4.00 ±0.10 (2 SIDES) 9 R = 0.115 TYP 0.40 ±0.10 16 2.44 ±0.10 (2 SIDES) PIN 1 TOP MARK (SEE NOTE 6) PIN 1 NOTCH 8 0.200 REF 1 0.25 ±0.05 0.50 BSC 0.75 ±0.05 0.00 – 0.05 (DHD16) DFN 0504 4.34 ±0.10 (2 SIDES) BOTTOM VIEW—EXPOSED PAD NOTE: 1. DRAWING PROPOSED TO BE MADE VARIATION OF VERSION (WJGD-2) IN JEDEC PACKAGE OUTLINE MO-229 2. DRAWING NOT TO SCALE 3. ALL DIMENSIONS ARE IN MILLIMETERS 4. DIMENSIONS OF EXPOSED PAD ON BOTTOM OF PACKAGE DO NOT INCLUDE MOLD FLASH. MOLD FLASH, IF PRESENT, SHALL NOT EXCEED 0.15mm ON ANY SIDE 5. EXPOSED PAD SHALL BE SOLDER PLATED 6. SHADED AREA IS ONLY A REFERENCE FOR PIN 1 LOCATION ON THE TOP AND BOTTOM OF PACKAGE 144345fe 12 LTC1443/LTC1444/LTC1445 Revision History (Revision history begins at Rev D) REV DATE DESCRIPTION PAGE NUMBER D 4/11 Minor update to Figure 5 in the Applications Information section E 5/12 Internal Voltage Reference Symbol Updated 10 1, 7, 8, 9, 10, 14 DFN Package Description Corrected 2 DFN Storage Temperature Range Increased to 150°C 2 Order Information Corrected 3 Related Parts Updated 14 144345fe 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. 13 LTC1443/LTC1444/LTC1445 Typical Application Single Cell to 5V Supply R1 1.1M 5% 5 R2 82.5k 1% 1 CELL LITHIUMION BATTERY 4 6 + V+ A 1/4 LTC1444 – R7 51k 5% – + 6 7 VIN SW C2 100µF 3 1 14 NC NC R5 51k 5% R4 2.4M 5% D1 1N5817 2 B 1/4 LTC1444 7 + HYST R3 1M 1% L1 10µH SUMIDA CD54-100 3 5 2 SENSE 4 1 SHDN 3 LT1300 ILIM + SEL PWR GND 8 GND C3 100µF 1 8 REF R6 430Ω 5% + – C1 1µF 1.2V 2, 4 Q1 MMFT2955ETI R9 267k 1% R8 732k 1% 11 10 + C 1/4 LTC1444 – LTC1444 REF 16 R10 3.37M 5% R11 51k 5% 13 R12 51k 15 5% 12 + D 1/4 LTC1444 VCC NMI µP RESET – C4 0.22µF V– 9 144345 TA03 C2, C3: AUX TPSD107M010R0100 OR SANYO OS-CON 16SA100M Related Parts PART NUMBER DESCRIPTION COMMENTS LTC1041 Bang-Bang Controller with 1nA Off Current 2.8V to 18V, Ideal for Temperature or Motor Control Circuit LTC1042 Micropower, High Accuracy Window Comparator Fault Detect, Go/No Go Test, Supply Monitor LTC1440/LTC1540 Ultralow Power Comparator with Reference 1.128V ±1% Reference, ±10mV (Max) Input Offset LTC1441/LTC1442 Dual Ultralow Power Comparators with Reference 1.182V ±1% Reference, 8µs Prop Delay, 5.7µA LTC1541/LTC1542 Combined Amplifier, Comparator and Reference 1.2V ±0.8 Reference, Amplifier Stable with 1000pF Load LTC1842/LTC1843 Dual Ultralow Power Comparators with Reference 1.182V ±1% Reference, 4µs, 3.5µA, Open-Drain Out LTC1921 Dual Independent Monitors for –48V Supply and Fuse –48V Telecom and Network Backplane Monitor LTC1998 High Accuracy Comparator with 1.2V Reference Adjustable Threshold and Hysteresis, 2.5mA Supply LT®6700 Dual Comparators with 400mV Reference 1.4V to 18V Operation, 18µs Prop Delay, Available in SOT-23 and 2mm × 3mm DFN Packages LT6703 Single Comparator with 400mV Reference 1.4V to 18V Operation, 6.5µA Supply Current, Available in SOT-23 and 2mm × 2mm DFN Packages 144345fe 14 Linear Technology Corporation LT 0512 REV E • PRINTED IN USA 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 ● FAX: (408) 434-0507 ● www.linear.com LINEAR TECHNOLOGY CORPORATION 1995