FEATURES TYPICAL APPLICATIO. LTC1443/LTC1444/LTC1445 Ultralow Power Quad Comparators with Reference DESCRIPTIO APPLICATIO S

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1 LTC/LTC/LTC ltralow Power Quad Comparators with Reference FEATRES ltralow Quiescent Current:.µA Max Reference Output Drives.µF Capacitor Adjustable Hysteresis (LTC/LTC) Wide Supply Range Single: V to V Dual: ±V to ±.V Input Voltage Range Includes the Negative Supply TTL/CMOS Compatible Outputs Propagation Delay: µs (Typ) (mv Overdrive) No Crowbar Current ma Continuous Source Current Pin Compatible pgrades for MAX (LTC) Low Profile (mm mm.mm) DFN Package APPLICATIO S Battery-Powered System Monitoring Threshold Detectors Window Comparators Oscillator Circuits, LTC and LT are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. DESCRIPTIO The LTC /LTC/LTC are ultralow power quad comparators with a built-in reference. The comparators feature less than.µa supply current over temperature, an internal reference (.V ±% for LTC or.v ±% for LTC/LTC), programmable hysteresis (LTC/LTC) and TTL/CMOS output (LTC/ LTC) that sinks and sources current (open-drain output for LTC). The reference output can drive a bypass capacitor of up to.µf without oscillation. The comparators operate from a single V to V supply or a dual ±V to ±.V supply (LTC). Comparator hysteresis is easily programmable using two resistors and the HYST pin (LTC/LTC). Each comparator s input operates from the negative supply to within.v of the positive supply. The LTC/LTC comparator output stage can continuously source up to ma. By eliminating the cross-conducting current that normally happens when the comparator changes logic states, power supply glitches are eliminated. The LTC/LTC/LTC are available in the -pin SO, PDIP and DFN packages. TYPICAL APPLICATIO Reference Settling Test Circuit Reference Settling V IN.M % V TO V IN A IN A V OT mv/div V V V V.M % R k R.M R Ω C.µF HYST LTC V OT ms/div LTC// TA LTC// TA fc

2 LTC/LTC/LTC ABSOLTE AXI RATI GS W W W (Note ) Voltage: V to V, V to GND, GND to V...V to.v IN, IN, HYST... (V.V) to (V.V)... (V.V) to (V.V) OT (LTC)... (V.V) to (GND.V) OT (LTC/LTC)... (V.V) to (V.V) Current: IN, IN, HYST... ma... ma OT... ma OT Short-Circuit Duration (V.V)... Continuous Power Dissipation... mw Operating Temperature Range Commercial... C to 7 C Industrial... C to C Storage Temperature Range PDIP, SO... C to C DFN... C to C Lead Temperature Range (Soldering, sec) PDIP, SO... C W PACKAGE/ORDER I FOR ATIO TOP VIEW TOP VIEW OT B OT A V IN A IN A IN B IN B 7 OT C OT D GND/HYST IN D IN D IN C IN C V OT B OT A V IN A IN A IN B IN B 7 7 OT C OT D GND/HYST IN D IN D IN C IN C V N PACKAGE -LEAD PDIP S PACKAGE -LEAD PLASTIC SO T JMAX = C, θ JA = C/ W (N) T JMAX = C, θ JA = C/ W (S) PIN IS GND FOR THE LTC PIN IS HYST FOR THE LTC AND LTC DHD PACKAGE -LEAD (mm mm) PLASTIC DFN T JMAX = C, θ JA = C/ W EXPOSED PAD (PIN 7) INTERNALLY CONNECTED TO V PIN IS GND FOR THE LTC PIN IS HYST FOR THE LTC AND LTC LTCCN LTCCS LTCIN LTCIS LTCCN LTCCS ORDER PART NMBER LTCIN LTCIS LTCCN LTCCS LTCIN LTCIS ORDER PART NMBER LTCCDHD LTCIDHD LTCCDHD LTCIDHD LTCCDHD LTCIDHD DHD PART* MARKING Order Options Tape and Reel: Add #TR Lead Free: Add #PBF Lead Free Tape and Reel: Add #TRPBF Lead Free Part Marking: *The temperature grade is identified by a label on the shipping container. Consult LTC Marketing for parts specified with wider operating temperature ranges. fc

3 LTC/LTC/LTC ELECTRICAL CHARACTERISTICS The denotes the specifications which apply over the full operating temperature range, otherwise specifications are at T A = C. V = V, V = GND = V, unless otherwise noted. SYMBOL PARAMETER CONDITIONS MIN TYP MAX NITS Power Supply V Supply Voltage Range.. V I CC Supply Current IN = IN = mv.. µa HYST = (LTC/LTC) Comparator V OS Comparator Input Offset Voltage V CM =.V ±. ±. mv I IN Input Leakage Current (IN, IN ) V IN = V IN =.V ±. ±. na Input Leakage Current (HYST) LTC/LTC ±. ±. na V CM Comparator Input Common Mode Range V V.V V CMRR Common Mode Rejection Ratio V to (V.V).. mv/v PSRR Power Supply Rejection Ratio V = V to V.. mv/v Noise Voltage Noise Hz to khz µv RMS V HYST Hysteresis Input Voltage Range LTC, LTC mv V t PD Propagation Delay Overdrive = mv, C OT = pf µs Overdrive = mv, C OT = pf µs V OH Output High Voltage I O = ma; LTC/LTC V.V V V OL Output Low Voltage I O =.ma; LTC GND.V V I O =.ma; LTC/LTC V.V V Reference V Reference Voltage No Load, LTC C Temp Range.7.. V I Temp Range.. V No Load, LTC/ C Temp Range... V LTC I Temp Range.. V I SORCE Reference Output Source Current V mv µa I SINK Reference Output Sink Current V.mV µa V mv µa Noise Voltage Noise Hz to khz µv RMS The denotes the specifications which apply over the full operating temperature range, otherwise specifications are at T A = C. V = V, V = GND = V, unless otherwise noted. SYMBOL PARAMETER CONDITIONS MIN TYP MAX NITS Power Supply V Supply Voltage Range.. V I CC Supply Current IN = IN = mv, HYST = µa Comparator V OS Comparator Input Offset Voltage V CM =.V ±. ±. mv I IN Input Leakage Current (IN, IN ) V IN = V IN =.V ±. ±. na Input Leakage Current (HYST) LTC/LTC ±. ±. na V CM Comparator Input Common Mode Range V V.V V CMRR Common Mode Rejection Ratio V to (V.V).. mv/v PSRR Power Supply Rejection Ratio V = V to V.. mv/v Noise Voltage Noise Hz to khz µv RMS V HYST Hysteresis Input Voltage Range LTC/LTC mv V t PD Propagation Delay Overdrive = mv, C OT = pf µs Overdrive = mv, C OT = pf µs V OH Output High Voltage I O = ma, LTC/LTC V.V V V OL Output Low Voltage I O =.ma; LTC GND.V V I O =.ma; LTC/LTC V.V V fc

4 LTC/LTC/LTC ELECTRICAL CHARACTERISTICS The denotes the specifications which apply over the full operating temperature range, otherwise specifications are at T A = C. V = V, V = GND = V, unless otherwise noted. SYMBOL PARAMETER CONDITIONS MIN TYP MAX NITS Reference V Reference Voltage No Load, LTC C Temp Range.7.. V I Temp Range.. V No Load, LTC/ C Temp Range... V LTC I Temp Range.. V I SORCE Reference Output Source Current V mv µa I SINK Reference Output Sink Current V.mV µa V mv µa Noise Noise Voltage Hz to khz µv RMS Note : Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. Exposure to any Absolute Maximum Rating condition for extended periods may affect device reliability and lifetime. TYPICAL PERFOR A CE CHARACTERISTICS W LTC/LTC Hysteresis Control Supply Current vs Supply Voltage Supply Current vs Temperature IN IN (mv) SPPLY CRRENT (µa) T A = C SPPLY CRRENT (µa) IN = (IN mv) V = GND (LTC) V = V V = V V = V V = V V = V V = V V V HYST (mv) SPPLY VOLTAGE (V). TEMPERATRE ( C) LTC// TPC LTC// TPC LTC// TPC ERENCE VOLTAGE (V).... LTC/LTC Reference Voltage vs Temperature V = V ERENCE VOLTAGE (V) LTC Reference Voltage vs Temperature V = V V = GND ERENCE VOLTAGE (V)..... LTC Reference Output Voltage vs Output Load Current V = V V = GND T A = C SORCE.7.7. TEMPERATRE ( C).7 TEMPERATRE ( C) LOAD CRRENT (ma). LTC// TPC LTC// TPC LTC// TPC fc

5 LTC/LTC/LTC TYPICAL PERFOR A CE CHARACTERISTICS W LTC Reference Output Voltage vs Output Load Current Comparator Output Voltage High vs Load Current Comparator Output Voltage Low vs Load Current ERENCE OTPT VOLTAGE (V) V = V V = GND T A = C SINK OTPT VOLTAGE HIGH (V).... V = V V = V V = V T A = C OTPT VOLTAGE LOW (V)..... T A = C V = V V = V V = V. LOAD CRRENT (µa). LOAD CRRENT (ma) 7 LOAD CRRENT (ma) LTC// TPC7 LTC// TPC LTC// TPC INPT VOLTAGE (mv) OTPT VOLTAGE (V) T A = C mv mv Comparator Response Time vs Input Overdrive mv mv RESPONSE TIME (µs) LTC// TPC INPT VOLTAGE (mv) OTPT VOLTAGE (V) Comparator Response Time vs Input Overdrive T A = C mv mv mv mv RESPONSE TIME (µs) LTC// TPC SINK CRRENT (ma) Comparator Short-Circuit Sink Current vs Supply Voltage T A = C OT CONNECTED TO V 7 SPPLY VOLTAGE (V) LTC// TPC Comparator Short-Circuit Source Current vs Supply Voltage Comparator Response Time vs Load Capacitance SORCE CRRENT (ma) OT CONNECTED TO V = GND = V RESPONSE TIME (µs) t PHL t PLH SPPLY VOLTAGE (V) LOAD CAPACITANCE (nf) LTC// TPC LTC// TPC fc

6 LTC/LTC/LTC TYPICAL PERFOR A CE CHARACTERISTICS W Supply Current vs Comparator Input Frequency Comparator Response Time at Low Supply Voltage SPPLY CRRENT (µa) C OT = pf C OT = pf C OT = pf RESPONSE TIME (µs) mv OVERDRIVE mv OVERDRIVE k k k INPT FREQENCY (Hz) LTC TPC SPPLY VOLTAGE (V) LTC// TPC PI F CTIO S OT B LTC OT C OT B LTC/LTC OT C OT A OT D OT A OT D V IN A GND IN D V IN A HYST IN D IN A IN D IN A IN D IN B IN C IN B IN C 7 IN B IN C 7 IN B IN C.V V.V V // PD // PD OT B (Pin ): Comparator B Output. (Open-drain output for LTC). Output can source up to ma (LTC, LTC) and sink ma. OT A (Pin ): Comparator A Output. (Open-drain output for LTC). Output can source up to ma (LTC, LTC) and sink ma. V (Pin ): Positive Supply. IN A (Pin ): Inverting Input of Comparator A. Input common mode range from V to V.V. Input current typically pa at C. IN A (Pin ): Noninverting Input of Comparator A. Input common mode range from V to V.V. Input current typically pa at C. IN B (Pin ): Inverting Input of Comparator B. Input common mode range from V to V.V. Input current typically pa at C. fc

7 LTC/LTC/LTC PI F CTIO S IN B (Pin 7): Noninverting Input of Comparator B. Input common mode range from V to V.V. Input current typically pa at C. (Pin ): Reference Output. With respect to V. Can source up to µa and sink µa at C. Drive.µF bypass capacitor without oscillation. V (Pin ): Negative Supply. Connect to ground for single supply operation on LTC. IN C (Pin): Inverting Input of Comparator C. Input common mode range from V to V.V. Input current typically pa at C. IN C (Pin ): Noninverting Input of Comparator C. Input common mode range from V to V.V. Input current typically pa at C. IN D (Pin ): Inverting Input of Comparator D. Input common mode range from V to V.V. Input current typically pa at C. APPLICATIO S I FOR ATIO W The LTC/LTC/LTC is a family of quad micropower comparators with a built-in reference (.V for the LTC and.v for the LTC/LTC). Features include programmable hysteresis (LTC/ LTC), wide supply voltage range (V to V) and the ability of the reference to drive up to a.µf capacitor without oscillation. The comparator CMOS outputs (LTC/LTC) can source up to ma while the LTC has an open-drain output to V. The supply current glitches that normally occur when the comparator output switches states have been eliminated. Power Supplies The comparator family operates from a single V to V supply. The LTC includes a separate ground for the comparator output stage, allowing a split supply ranging from ±V to ±.V. Connecting V to GND on the LTC allows single supply operation. If the comparator output is required to source more than ma or the supply source impedance is high, V should be bypassed with a.µf capacitor. IN D (Pin ): Noninverting Input of Comparator D. Input common mode range from V to V.V. Input current typically pa at C. GND (Pin ): LTC Ground. Connect to V for single supply operation. HYST (Pin ): LTC/LTC Hysteresis Input. Connect to if not used. Input voltage range is from V to V mv. OT D (Pin ): Comparator D Output. (Open-drain output for LTC). Output can source up to ma (LTC, LTC) and sink ma. OT C (Pin ): Comparator C Output. (Open-drain output for LTC). Output can source up to ma (LTC, LTC) and sink ma. Exposed Pad (Pin 7, DFN Package): This pin is internally connected to V. Connection is optional, but will improve thermal dissipation. Comparator Inputs The comparator inputs can swing from the negative supply (V ) to within.v maximum of the positive supply (V ). The inputs can be forced mv below V or above V without damage, and the typical input leakage current is only ±pa. Comparator Outputs The LTC comparator output swings between GND and V to assure TTL compatibility with a split supply. The LTC and LTC outputs swing between V and V. The outputs are capable of sourcing up to ma (LTC/ LTC) and sinking up to ma 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. Voltage Reference The internal bandgap reference has a voltage of.v for LTC or.v for LTC/LTC referenced to fc 7

LTC/LTC/LTC APPLICATIO S I FOR ATIO W V. The reference accuracy is.% from C to C. It can source up to µa and sink up to µa with a V supply. The reference can drive a bypass capacitor of up to.

8 LTC/LTC/LTC APPLICATIO S I FOR ATIO W V. The reference accuracy is.% from C to C. It can source up to µa and sink up to µa with a V supply. The reference can drive a bypass capacitor of up to.µf without oscillation and by inserting a series resistor, capacitance values up to µf can be used (Figure ). Figure shows the resistor value required for different capacitor values to achieve critical damping. ERENCE OTPT R LTCX V TO V R k R.M R Ω C.µF IN A IN A HYST V LTC V OT C V LTC// F Figure a. V Glitching Test Circuit LTC// F RESISTOR VALE (kω) Figure. Damping the Reference Output.... CAPACITOR VALE (µf) LTC// F Figure. Damping Resistance vs Bypass Capacitor Value Bypassing the reference can help prevent false tripping of the comparators by preventing glitches on the V or the reference output voltage. Figure shows the bypassed reference output with a square wave applied to the V pin. Resistors R and R set mv of hysteresis, while R damps the reference response. Note that the comparator output doesn t trip. Hysteresis Hysteresis can be added to the LTC/LTC by connecting a resistor (R) between the and HYST pins, and a second resistor (R) from HYST to V (Figure ). mv/div V V V V OT Figure b. V Glitching Response V R = HB I ()(I ) R R ms/div HYST LTC LTC// F Figure. Programmable Hysteresis LTC// TA ( ) V HB.V R = I The difference between the upper and lower threshold voltages or hysteresis voltage band (V HB ) is equal to twice the voltage difference between the 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 and HYST is mv, fc

9 LTC/LTC/LTC APPLICATIO S I FOR ATIO producing a maximum hysteresis voltage band of mv. If hysteresis is not wanted, the HYST pin should be shorted to. Acceptable values for I range from.µa to µa. If.M is chosen for R, then R(kΩ) = V HB (mv). Level Detector The LTC is ideal for use as a multisupply micropower level detector as shown in Figure. V R.M % R7.M % V R.M % R.M % R k, % R.M % W 7 R Ω % C.µF IN B IN B IN A IN A HYST V /LTC V LTC// F OT B OT A Figure. Glitch-Free Level Detector with Hysteresis R M % R and R form a voltage divider from V to the noninverting comparator A input. R and R7 are used to divide down V, while R is the output pull-up resistor for the comparator outputs. R and R set the hysteresis voltage and R and C bypass the reference output. The following design procedure can be used to select the component values: V. Choose the V voltage trip level, in this example.v.. Calculate the required resistive divider ratio. Ratio = V /V IN Ratio =.V/.V =.. Choose the required hysteresis voltage band at the input, V HBIN, in this example mv. Calculate the hysteresis voltage band referred to the comparator input V HB. V HB = (V HBIN )(Ratio) V HB = (mv)(.) V HB =.7mV. Choose the values for R and R to set the hysteresis. R =.M R(kΩ) = V HB = k. Choose the values for R and R to set the trip point. R = V /I BIAS =.V/µA.M V R = R IN ( ) V V HB. V R = (. M) mv. V R =. M sing the same equations, R and R7 are.m and.m respectfully to set the trip level at V for V. fc

10 LTC/LTC/LTC PACKAGE DESCRIPTIO N Package -Lead PDIP (Narrow. Inch) (Reference LTC DWG # --).77* (.) MAX. ±.* (.77 ±.) 7.. (7..). ±. (. ±.7).. (..).. (..).... (..) NOTE: INCHES. DIMENSIONS ARE MILLIMETERS. (.) MIN. (.) MIN *THESE DIMENSIONS DO NOT INCLDE MOLD FLASH OR PROTRSIONS. MOLD FLASH OR PROTRSIONS SHALL NOT EXCEED. INCH (.mm). (.) BSC. (.) TYP. ±. (.7 ±.7) N S Package -Lead Plastic Small Outline (Narrow. Inch) (Reference LTC DWG # --) N. BSC. ±... (..) NOTE. MIN N/. ±... (.7.7) N N/..7 (..) NOTE. ±. TYP RECOMMENDED SOLDER PAD LAYOT.. (..).. (..) TYP.. (..7) 7.. (..).. (..7) NOTE: INCHES. DIMENSIONS IN (MILLIMETERS).. (..) TYP. DRAWING NOT TO SCALE. THESE DIMENSIONS DO NOT INCLDE MOLD FLASH OR PROTRSIONS. MOLD FLASH OR PROTRSIONS SHALL NOT EXCEED." (.mm). (.7) BSC S fc

11 LTC/LTC/LTC PACKAGE DESCRIPTIO DHD Package -Lead Plastic DFN (mm mm) (Reference LTC DWG # --77).7 ±.. ±.. ±.. ±. ( SIDES) PACKAGE OTLINE. ±. ( SIDES). ±.. BSC RECOMMENDED SOLDER PAD PITCH AND DIMENSIONS. ±. ( SIDES) R =. TYP R =. TYP. ±.. ±. ( SIDES). ±. ( SIDES) PIN TOP MARK (SEE NOTE )..7 ±... NOTE:. DRAWING PROPOSED TO BE MADE VARIATION OF VERSION (WJGD-) IN JEDEC PACKAGE OTLINE MO-. DRAWING NOT TO SCALE. ALL DIMENSIONS ARE IN MILLIMETERS. DIMENSIONS OF EXPOSED PAD ON BOTTOM OF PACKAGE DO NOT INCLDE MOLD FLASH. MOLD FLASH, IF PRESENT, SHALL NOT EXCEED.mm ON ANY SIDE. EXPOSED PAD SHALL BE SOLDER PLATED. SHADED AREA IS ONLY A ERENCE FOR PIN LOCATION ON THE TOP AND BOTTOM OF PACKAGE. ±.. BSC. ±. ( SIDES) BOTTOM VIEW EXPOSED PAD PIN NOTCH (DHD) DFN 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. fc

12 LTC/LTC/LTC TYPICAL APPLICATIO Single Cell to V Supply R.M % CELL LITHIM- ION BATTERY R.k % R M % R k % R.M % V A / LTC R7 k % B / LTC 7 HYST R Ω % C µf V LTC L µh SMIDA CD- C µf 7 V IN SW SENSE SHDN LT NC NC I LIM SEL PWR GND GND D N7, Q MMFTETI C µf R 7k % R 7k % C / LTC C.µF R.7M % D / LTC R k % R k % V CC NMI µp RESET C, C: AX TPSD7MR OR SANYO OS-CON SAM LTC// F RELATED PARTS PART NMBER DESCRIPTION COMMENTS LTC Bang-Bang Controller with na Off Current.V to V, Ideal for Temperature or Motor Control Circuit LTC Micropower, High Accuracy Window Comparator Fault Detect, Go/No Go Test, Supply Monitor LTC/LTC ltralow Power Comparator with Reference.V ±% Reference, ±mv (Max) Input Offset LTC/LTC Dual ltralow Power Comparators with Reference.V ±% Reference, µs Prop Delay,.7µA LTC/LTC Combined Amplifier, Comparator and Reference.V ±. Reference, Amplifier Stable with pf Load LTC/LTC Dual ltralow Power Comparators with Reference.V ±% Reference, µs,.µa, Open-Drain Out LTC Dual Independent Monitors for V Supply and Fuse V Telecom and Network Backplane Monitor LTC High Accuracy Comparator with.v Reference Adjustable Threshold and Hysteresis,.mA Supply LT 7-/LT7- Dual Comparators with mv Reference.V to V Operating Range, µs Prop Delay, LT7- Available in SOT- and mm mm DFN Packages Linear Technology Corporation McCarthy Blvd., Milpitas, CA -77 () - FAX: () -7 fc LT REV C PRINTED IN SA LINEAR TECHNOLOGY CORPORATION

LTC1443/LTC1444/LTC1445 Ultralow Power Quad Comparators with Reference Description. Features. Applications. Typical Application

LTC1443/LTC1444/LTC1445 Ultralow Power Quad Comparators with Reference Description. Features. Applications. Typical Application Features n Ultralow Quiescent Current:.µA Max n Reference Output Drives.µF Capacitor n Adjustable Hysteresis (LTC/LTC) n Wide Supply Range Single: V to V Dual: ±V to ±.V n Input Voltage Range Includes