1.4V (MIN) 3V (NOM) V BATT > 1.6V V BATT > 2V. MONITOR CONSUMES ~10µA HYSTERESIS IS APPROXIMATELY 2% OF TRIP VOLTAGE

Transcription

1 FEATURES n Interna Reference n Tota Threshod Error: ±.5% Max at 5 C n Inputs and Outputs Operate to 3V n Wide Suppy Range:.V to 8V n Specified for 55 C to 5 C Temperature Range n Low Quiescent Current:.5 Typ at 5V n Interna Hysteresis:.5 Typ n Low Input Bias Current: ± Max n Over-The-Top Input aso Incudes Ground n Open-Coector Outputs Aow Leve Transation n Choice of Input Poarities: LT7-/LT7-/ LT7-3/LT7HV-/LT7HV-/LT7HV-3 n Avaiabe in Low Profie (mm) SOT-3 (ThinSOT ) and mm 3mm DFN Packages APPLICATIONS n Battery-Powered System Monitoring n Threshod Detectors n Window Comparators n Reay Driving n Industria Contro Systems n Handhed Instruments n Automotive Monitor and Contros LT7/LT7HV Micropower, Low Votage, Dua Comparator with Reference DESCRIPTION The LT 7/LT7HV combine two micropower, ow votage comparators with a reference in a -ead SOT-3 or tiny DFN package. Operating with suppies from.v up to 8V, these devices draw ony.5, making them idea for ow votage system monitoring. Hysteresis is incuded in the comparators, easing design requirements to insure stabe output operation. The comparators each have one input avaiabe externay; the other inputs are connected internay to the reference. The comparator outputs are open coector and the output oad can be referred to any votage up to 8V (3V for LT7HV), independent of suppy votage. The output stage sinking capabiity is guaranteed to be greater than 5mA over temperature. The three versions of this part differ by the poarity of the avaiabe comparator inputs. The LT7-/ LT7HV- has one inverting input and one noninverting input, making it suitabe for use as a window comparator. The LT7-/LT7HV- has two inverting inputs and the LT7-3/LT7HV-3 has two noninverting inputs. A versions are offered in commercia, industria and automotive temperature ranges. L, LT, LTC, LTM, Linear Technoogy, the Linear ogo and Over-The-Top are registered trademarks and ThinSOT and PowerPath are trademarks of Linear Technoogy Corporation. A other trademarks are the property of their respective owners. TYPICAL APPLICATION ALKALINE AA CELLS.µF Micropower Battery Monitor M 3.k LT7-3 COMP B V R = REFERENCE k COMP A M M V BATT.V (MIN) 3V (NOM) V BATT >.V V BATT > V MONITOR CONSUMES ~ HYSTERESIS IS APPROXIMATELY % OF TRIP VOLTAGE THRESHOLD VOLTAGE () Comparator Threshods vs Temperature #A #B #A #B RISING INPUT FALLING INPUT 39 TWO TYPICAL PARTS 39 COMP A AND B 39 8 TEMPERATURE ( C) 73 TA 73 TA For more information 73fh

2 LT7/LT7HV ABSOLUTE MAXIMUM RATINGS (Note ) Tota Suppy Votage ( to )...8.5V Input Votage (IN, IN) LT7 (Note 3) V to (.3V) LT7HV (Note 3)... V to (.3V) LT7 Output Votage (OUT) V to (.3V) LT7HV Output Votage (OUT)... V to (.3V) Output Short-Circuit Duration (Note )... Indefinite Input Current (Note 3)... ma Operating Temperature Range (Note ) LT7CS/LT7HVCS/ LT7CDCB-/-/-3... C to 85 C LT7IS/LT7HVIS/ LT7IDCB-/-/-3... C to 85 C LT7HS/LT7HVHS/ LT7HDCB-/-/-3... C to 5 C LT7MPDCB/ LT7MPS-/-/ C to 5 C Specified Temperature Range (Note 5) LT7CS/LT7HVCS/ LT7CDCB-/-/-3... C to 7 C LT7IS/LT7HVIS/ LT7IDCB-/-/-3... C to 85 C LT7HS/LT7HVHS/ LT7HDCB-/-/-3... C to 5 C LT7MPDCB/ LT7PMS-/-/ C to 5 C Maximum Junction Temperature S Package... 5 C DCB Package... 5 C Storage Temperature Range S Package... 5 C to 5 C DCB Package... 5 C to 5 C Lead Temperature, TSOT-3 (Sodering, sec)... 3 C PIN CONFIGURATION LT7- LT7HV- LT7- LT7HV- LT7-3 LT7HV-3 TOP VIEW TOP VIEW TOP VIEW OUTA OUTB OUTA OUTB OUTA OUTB INA 3 INB INA 3 INB INA 3 INB S PACKAGE -LEAD PLASTIC TSOT-3 T JMAX = 5 C, θ JA = 3 C/W S PACKAGE -LEAD PLASTIC TSOT-3 T JMAX = 5 C, θ JA = 3 C/W S PACKAGE -LEAD PLASTIC TSOT-3 T JMAX = 5 C, θ JA = 3 C/W LT7- LT7- LT7-3 TOP VIEW TOP VIEW TOP VIEW OUTA INA OUTA INA OUTA INA OUTB 7 5 OUTB 7 5 OUTB INB 3 INB 3 INB DCB PACKAGE -LEAD (mm 3mm) PLASTIC DFN T JMAX = 5 C, θ JA = C/W SOLDERED EXPOSED PAD (PIN 7) INTERNALLY CONNECTED TO (PCB CONNECTION OPTIONAL) DCB PACKAGE -LEAD (mm 3mm) PLASTIC DFN T JMAX = 5 C, θ JA = C/W SOLDERED EXPOSED PAD (PIN 7) INTERNALLY CONNECTED TO (PCB CONNECTION OPTIONAL) DCB PACKAGE -LEAD (mm 3mm) PLASTIC DFN T JMAX = 5 C, θ JA = C/W SOLDERED EXPOSED PAD (PIN 7) INTERNALLY CONNECTED TO (PCB CONNECTION OPTIONAL) For more information 73fh

3 LT7/LT7HV ORDER INFORMATION Lead Free Finish TAPE AND REEL (MINI) TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION SPECIFIED TEMPERATURE RANGE LT7CS-#TRMPBF LT7CS-#TRPBF LTK7 -Lead Pastic TSOT-3 C to 7 C LT7HVCS-#TRMPBF LT7HVCS-#TRPBF LTK7 -Lead Pastic TSOT-3 C to 7 C LT7IS-#TRMPBF LT7IS-#TRPBF LTK7 -Lead Pastic TSOT-3 C to 85 C LT7HVIS-#TRMPBF LT7HVIS-#TRPBF LTK7 -Lead Pastic TSOT-3 C to 85 C LT7HS-#TRMPBF LT7HS-#TRPBF LTK7 -Lead Pastic TSOT-3 C to 5 C LT7HVHS-#TRMPBF LT7HVHS-#TRPBF LTK7 -Lead Pastic TSOT-3 C to 5 C LT7MPS-#TRMPBF LT7MPS-#TRPBF LTK7 -Lead Pastic TSOT-3 55 C to 5 C LT7CS-#TRMPBF LT7CS-#TRPBF LTADL -Lead Pastic TSOT-3 C to 7 C LT7HVCS-#TRMPBF LT7HVCS-#TRPBF LTADL -Lead Pastic TSOT-3 C to 7 C LT7IS-#TRMPBF LT7IS-#TRPBF LTADL -Lead Pastic TSOT-3 C to 85 C LT7HVIS-#TRMPBF LT7HVIS-#TRPBF LTADL -Lead Pastic TSOT-3 C to 85 C LT7HS-#TRMPBF LT7HS-#TRPBF LTADL -Lead Pastic TSOT-3 C to 5 C LT7HVHS-#TRMPBF LT7HVHS-#TRPBF LTADL -Lead Pastic TSOT-3 C to 5 C LT7MPS-#TRMPBF LT7MPS-#TRPBF LTADL -Lead Pastic TSOT-3 55 C to 5 C LT7CS-3#TRMPBF LT7CS-3#TRPBF LTADM -Lead Pastic TSOT-3 C to 7 C LT7HVCS-3#TRMPBF LT7HVCS-3#TRPBF LTADM -Lead Pastic TSOT-3 C to 7 C LT7IS-3#TRMPBF LT7IS-3#TRPBF LTADM -Lead Pastic TSOT-3 C to 85 C LT7HVIS-3#TRMPBF LT7HVIS-3#TRPBF LTADM -Lead Pastic TSOT-3 C to 85 C LT7HS-3#TRMPBF LT7HS-3#TRPBF LTADM -Lead Pastic TSOT-3 C to 5 C LT7HVHS-3#TRMPBF LT7HVHS-3#TRPBF LTADM -Lead Pastic TSOT-3 C to 5 C LT7MPS-3#TRMPBF LT7MPS- #TRPBF LTADM -Lead Pastic TSOT-3 55 C to 5 C LT7CDCB-#TRMPBF LT7CDCB-#TRPBF LBXW -Lead (mm 3mm) Pastic DFN C to 7 C LT7IDCB-#TRMPBF LT7IDCB-#TRPBF LBXW -Lead (mm 3mm) Pastic DFN C to 85 C LT7HDCB-#TRMPBF LT7HDCB-#TRPBF LBXW -Lead (mm 3mm) Pastic DFN C to 5 C LT7MPDCB-#TRMPBF LT7MPDCB-#TR LDVS -Lead (mm 3mm) Pastic DFN 55 C to 5 C LT7CDCB-#TRMPBF LT7CDCB-#TRPBF LBXX -Lead (mm 3mm) Pastic DFN C to 7 C LT7IDCB-#TRMPBF LT7IDCB-#TRPBF LBXX -Lead (mm 3mm) Pastic DFN C to 85 C LT7HDCB-#TRMPBF LT7HDCB-#TRPBF LBXX -Lead (mm 3mm) Pastic DFN C to 5 C LT7MPDCB-#TRMPBF LT7MPDCB-#TR LDVT -Lead (mm 3mm) Pastic DFN 55 C to 5 C LT7CDCB-3#TRMPBF LT7CDCB-3#TRPBF LBXY -Lead (mm 3mm) Pastic DFN C to 7 C LT7IDCB-3#TRMPBF LT7IDCB-3#TRPBF LBXY -Lead (mm 3mm) Pastic DFN C to 85 C LT7HDCB-3#TRMPBF LT7HDCB-3#TRPBF LBXY -Lead (mm 3mm) Pastic DFN C to 5 C LT7MPDCB-3#TRMPBF LT7MPDCB-3#TR LDVV -Lead (mm 3mm) Pastic DFN 55 C to 5 C TRM = 5 pieces. *Temperature grades are identified by a abe on the shipping container. Consut LTC Marketing for parts specified with wider operating temperature ranges. Consut LTC Marketing for information on ead based finish parts. For more information on ead free part marking, go to: For more information on tape and ree specifications, go to: For more information 73fh 3

4 LT7/LT7HV ELECTRICAL CHARACTERISTICS, (LT7-/LT7-/LT7-3) uness otherwise specified. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS V TH(R) Rising Input Threshod Votage (Note ) R L = k, V O = wing V TH(F) Faing Input Threshod Votage (Note ) R L = k, V O = wing HYS HYS = V TH(R) V TH(F), 5V, V, 8V, R L = k, V O = wing I B Input Bias Current, 8V, V IN =, V IN = 8V, 8V, V IN =.V V OL Output Low Votage Input Overdrive, I OUT =.5mA =.V, I OUT = 3mA, I OUT = 5mA I OFF Output Leakage Current, 8V, V OUT =, V IN = Overdrive, V OUT = 8V, V IN = Overdrive t PD(HL) High-to-Low Propagation Deay, Input Overdrive, R L = k, V OL = ±. ±. ± ± ± ± µs t PD(LH) Low-to-High Propagation Deay, Input Overdrive, R L = k, 9 µs V OH =.9 t r Output Rise Time, Input Overdrive, R L = k. µs V O = (. to.9) t f Output Fa Time, Input Overdrive, R L = k. µs V O = (. to.9) I S Suppy Current No Load Current The denotes the specifications which appy over the temperature range of C T A 7 C, (LT7C-/LT7C-/LT7C-3) uness otherwise specified (Notes, 5). SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS V TH(R) Rising Input Threshod Votage (Note ) R L = k, V O = wing V TH(F) Faing Input Threshod Votage (Note ) R L = k, V O = wing For more information 73fh

5 LT7/LT7HV ELECTRICAL CHARACTERISTICS The denotes the specifications which appy over the temperature range of C T A 7 C, (LT7C-/LT7C-/LT7C-3) uness otherwise specified (Notes, 5). SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS HYS HYS = V TH(R) V TH(F), 5V, V, 8V, R L = k, V O = wing 3 I B Input Bias Current, 8V, V IN =, V IN = 8V, 8V, V IN =.V V OL Output Low Votage Input Overdrive, I OUT =.5mA =.V, I OUT = 3mA, I OUT = 5mA I OFF Output Leakage Current, 8V, V OUT =, V IN = Overdrive, V OUT = 8V, V IN = Overdrive I S Suppy Current No Load Current ±5 ±5 ± The denotes the specifications which appy over the temperature range of C T A 85 C, (LT7I-/LT7I-/LT7I-3) uness otherwise specified (Notes, 5). SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS V TH(R) Rising Input Threshod Votage (Note ) R L = k, V O = wing V TH(F) Faing Input Threshod Votage (Note ) R L = k, V O = wing HYS HYS = V TH(R) V TH(F), 5V, V, 8V, R L = k, V O = wing.5 I B Input Bias Current, 8V, V IN =, V IN = 8V, 8V, V IN =.V V OL Output Low Votage Input Overdrive, I OUT =.ma =.V, I OUT = 3mA, I OUT = 5mA I OFF Output Leakage Current, 8V, V OUT =, V IN = Overdrive, V OUT = 8V, V IN = Overdrive I S Suppy Current No Load Current ±5 ±5 ± For more information 73fh 5

6 LT7/LT7HV ELECTRICAL CHARACTERISTICS The denotes the specifications which appy over the temperature range of C T A 5 C, (LT7H-/LT7H-/LT7H-3) uness otherwise specified (Notes, 5). SYMBOL PARAMETER CONDITIONS MIN V TH(R) Rising Input Threshod Votage (Note ) R L = k, V O = wing V TH(F) Faing Input Threshod Votage (Note ) R L = k, V O = wing LT7H TYP MAX UNITS HYS HYS = V TH(R) V TH(F), 5V, V, 8V, R L = k, V O = wing 3.5 I B Input Bias Current, 8V, V IN =, V IN = 8V, 8V, V IN = V OL Output Low Votage Input Overdrive, I OUT =.ma =.V, I OUT = 3mA, I OUT = 5mA I OFF Output Leakage Current, 8V, V OUT =, V IN = Overdrive, V OUT = 8V, V IN = Overdrive I S Suppy Current No Load Current ±5 ±5 ± The denotes the specifications which appy over the temperature range of 55 C T A 5 C, (LT7MP-/LT7MP-/LT7MP-3) uness otherwise specified (Notes, 5). SYMBOL PARAMETER CONDITIONS MIN V TH(R) Rising Input Threshod Votage (Note ) R L = k, V O = wing V TH(F) Faing Input Threshod Votage (Note ) R L = k, V O = wing LT7H TYP MAX UNITS HYS HYS = V TH(R) V TH(F), 5V, V, 8V, R L = k, V O = wing 3.5 I B Input Bias Current, 8V, V IN =, V IN = 8V, 8V, V IN = V OL Output Low Votage Input Overdrive, I OUT =.ma =.V, I OUT = 3mA, I OUT = 5mA ±5 ±5 ±5 For more information 73fh

7 LT7/LT7HV ELECTRICAL CHARACTERISTICS The denotes the specifications which appy over the temperature range of 55 C T A 5 C, (LT7MP-/LT7MP-/LT7MP-3) uness otherwise specified (Notes, 5). SYMBOL PARAMETER CONDITIONS MIN I OFF Output Leakage Current, 8V, V OUT =, V IN = Overdrive, V OUT = 8V, V IN = Overdrive I S Suppy Current No Load Current LT7H TYP MAX UNITS , (LT7HV-/LT7HV-/LT7HV-3) uness otherwise specified. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS V TH(R) Rising Input Threshod Votage (Note ) R L = k, V O = wing V TH(F) Faing Input Threshod Votage (Note ) R L = k, V O = wing HYS HYS = V TH(R) V TH(F), 5V, V, 8V, R L = k, V O = wing I B Input Bias Current, 8V, V IN =, V IN = 8V, 3V, 8V, V IN =.V V OL Output Low Votage Input Overdrive, I OUT =.5mA =.V, I OUT = 3mA, I OUT = 5mA I OFF Output Leakage Current, 8V, V OUT =, V IN = Overdrive, V OUT = 8V, (3V, R L = k), V IN = Overdrive t PD(HL) High-to-Low Propagation Deay, Input Overdrive, R L = k, V OL = ±. ±. ± ± ± ± µs t PD(LH) Low-to-High Propagation Deay, Input Overdrive, R L = k, 9 µs V OH =.9 t r Output Rise Time, Input Overdrive, R L = k. µs V O = (. to.9) t f Output Fa Time, Input Overdrive, R L = k. µs V O = (. to.9) I S Suppy Current No Load Current For more information 73fh 7

8 LT7/LT7HV ELECTRICAL CHARACTERISTICS The denotes the specifications which appy over the temperature range of C T A 7 C, (LT7HVC-/LT7HVC-/LT7HVC-3) uness otherwise specified (Notes, 5). SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS V TH(R) V TH(F) Rising Input Threshod Votage (Note ) Faing Input Threshod Votage (Note ) R L = k, V O = wing R L = k, V O = wing HYS HYS = V TH(R) V TH(F), 5V, V, 8V, R L = k, V O = wing 3 I B Input Bias Current, 8V, V IN =, V IN = 8V, 3V, 8V, V IN =.V V OL Output Low Votage Input Overdrive, I OUT =.5mA =.V, I OUT = 3mA, I OUT = 5mA I OFF Output Leakage Current, 8V, V OUT =, V IN = Overdrive, V OUT = 8V, (3V, R L = k), V IN = Overdrive I S Suppy Current No Load Current ±5 ±5 ± The denotes the specifications which appy over the temperature range of C T A 85 C, (LT7HVI-/LT7HVI-/LT7HVI-3) uness otherwise specified (Notes, 5). SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS V TH(R) Rising Input Threshod Votage (Note ) R L = k, V O = wing V TH(F) Faing Input Threshod Votage (Note ) R L = k, V O = wing HYS HYS = V TH(R) V TH(F), 5V, V, 8V, R L = k, V O = wing.5 I B Input Bias Current, 8V, V IN =, V IN = 8V, 3V, 8V, V IN =.V V OL Output Low Votage Input Overdrive, I OUT =.ma =.V, I OUT = 3mA, I OUT = 5mA I OFF Output Leakage Current, 8V, V OUT =, V IN = Overdrive, V OUT = 8V, (3V, R L = k), V IN = Overdrive ±5 ±5 ±5 8 For more information 73fh

9 ELECTRICAL CHARACTERISTICS LT7/LT7HV The denotes the specifications which appy over the temperature range of C T A 85 C, (LT7HVI-/LT7HVI-/LT7HVI-3) uness otherwise specified (Notes, 5). SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS I S Suppy Current No Load Current The denotes the specifications which appy over the temperature range of C T A 5 C, (LT7HVH-/LT7HVH-/ LT7HVH-3) uness otherwise specified (Notes, 5). SYMBOL PARAMETER CONDITIONS MIN V TH(R) Rising Input Threshod Votage (Note ) V TH(F) Faing Input Threshod Votage (Note ) R L = k, V O = wing R L = k, V O = wing LT7H TYP MAX UNITS HYS HYS = V TH(R) V TH(F), 5V, V, 8V, R L = k, V O = wing 3.5 I B Input Bias Current, 8V, V IN =, V IN = 8V, 3V, 8V, V IN = V OL Output Low Votage Input Overdrive, I OUT =.ma =.V, I OUT = 3mA, I OUT = 5mA I OFF Output Leakage Current, 8V, V OUT =, V IN = Overdrive, V OUT = 8V, (3V, R L = k), V IN = Overdrive I S Suppy Current No Load Current Note : Stresses beyond those isted under Absoute Maximum Ratings may cause permanent damage to the device. Exposure to any Absoute Maximum Rating condition for extended periods may affect device reiabiity and ifetime. Note : A heat sink may be required to keep the junction temperature beow the absoute maximum rating when the output is shorted indefinitey. Note 3: The inputs are protected by ESD diodes to the ground. If the input votage exceeds.3v beow ground, the input current shoud be imited to ess than ma. Note : The LT7C-/-/-3/LT7HVC-/-/-3, and LT7I-/-/-3/LT7HVI-/-/-3 are guaranteed functiona over the operating temperature range of C to 85 C. The LT7H-/-/-3/ LT7HVH-/-/-3 is guaranteed functiona over the operating ±5 ±5 ± temperature range of C to 5 C. The LT7MP-/-/-3 is guaranteed functiona over the operating temperature range of 55 C to 5 C. Note 5: The LT7C-/-/-3/LT7HVC-/-/-3 is guaranteed to meet the specified performance from C to 7 C. The LT7C-/-/- 3/LT7HVC-/-/-3 are designed, characterized and expected to meet specified performance from C to 85 C but are not tested or QA samped at these temperatures. The LT7I-/-/-3/LT7HVI-/-/-3 is guaranteed to meet specified performance from C to 85 C. The LT7H-/-/-3/LT7HVH-/-/-3 is guaranteed to meet specified performance from C to 5 C.The LT7MP-/-/-3 is guaranteed to meet specified performance from 55 C to 5 C. Note : V TH defines the threshod votage of the comparators and combines the effect of offset and reference accuracy. For more information 73fh 9

10 LT7/LT7HV PIN FUNCTIONS LT7- LT7HV- LT7- LT7HV- LT7-3 LT7HV-3 INB COMP B OUTB INB COMP B OUTB INB COMP B OUTB REFERENCE REFERENCE REFERENCE INA COMP A OUTA INA COMP A OUTA INA COMP A OUTA 73 PF 73 PF 73 PF3 OUTA: Open-Coector Output of Comparator Section A. This pin provides drive for up to ma of oad current. Offstate votage may be as high as 8V (3V for LT7HV) above, regardess of used. : Ground. This pin is aso the ow side return of the interna reference. INA: Externa Input for Comparator Section A. The votage on this pin can range from.3v to 8V (3V for LT7HV) with respect to regardess of used. The input is noninverting for the LT7-/LT7HV- and LT7-3/LT7HV-3, and inverting for the LT7-/ LT7HV-. The other section A comparator input is internay connected to the reference. INB: Externa Input for Comparator Section B. The votage on this pin can range from.3v to 8V (3V for LT7HV) with respect to regardess of used. The input is noninverting for the LT7-3/LT7HV-3, and inverting for the LT7-/LT7HV- and LT7-/ LT7HV-. The other section B comparator input is internay connected to the reference. : Comparator Core Suppy Votage. The parts are characterized for operation with.v 8V with respect to. OUTB: Open-Coector Output of Comparator Section B. This pin provides drive for up to ma of oad current. Offstate votage may be as high as 8V (3V for LT7HV) above, regardess of used. For more information 73fh

11 TYPICAL PERFORMANCE CHARACTERISTICS LT7/LT7HV PERCENT OF UNITS (%) 8 8 Distribution of Rising Input Threshod Votage PERCENT OF UNITS (%) 8 8 Distribution of Faing Input Threshod Votage PERCENT OF UNITS (%) 8 8 Distribution of Hysteresis RISING INPUT THRESHOLD VOLTAGE () FALLING INPUT THRESHOLD VOLTAGE () HYSTERESIS () 73 G 73 G 73 G3 RISING INPUT THRESHOLD VOLTAGE () Rising Input Threshod Votage vs Temperature # # #3 # FOUR TYPICAL PARTS 39 8 TEMPERATURE ( C) 73 G RISING INPUT THRESHOLD VOLTAGE () Rising Input Threshod Votage vs Temperature TEMPERATURE ( C) 73 G5 RISING INPUT THRESHOLD VOLTAGE () Rising Input Threshod Votage vs Suppy Votage T A = 55 C 8 8 SUPPLY VOLTAGE (V) 73 G HYSTERESIS () Hysteresis vs Temperature Hysteresis vs Temperature Hysteresis vs Suppy Votage FOUR TYPICAL PARTS # # #3 # HYSTERESIS () HYSTERESIS () T A = 55 C TEMPERATURE ( C) 8 TEMPERATURE ( C) 8 8 SUPPLY VOLTAGE (V) 73 G7 73 G8 73 G9 For more information 73fh

12 LT7/LT7HV TYPICAL PERFORMANCE CHARACTERISTICS THRESHOLD SHIFT () Minimum Suppy Votage 3 T A = 55 C SUPPLY VOLTAGE (V) SUPPLY CURRENT () Quiescent Suppy Current vs Suppy Votage. 3. NO LOAD CURRENT T A = 55 C SUPPLY VOLTAGE (V) SUPPLY CURRENT () 5 3 Start-Up Suppy Current T A = 55 C SUPPLY VOLTAGE (V) 73 G 73 G 73 G SUPPLY CURRENT () Suppy Current vs Output Sink Current T A = C SUPPLY CURRENT () Suppy Current vs Output Sink Current SUPPLY CURRENT () Suppy Current vs Output Sink Current... OUTPUT SINK CURRENT (ma) 73 G3... OUTPUT SINK CURRENT (ma) 73 G... OUTPUT SINK CURRENT (ma) 73 G5 INPUT BIAS CURRENT () Beow Ground Input Bias Current Low Leve Input Bias Current High Leve Input Bias Current.3V < V IB < V T A = 55 C CURRENT IS GOING OUT OF THE DEVICE.3.. INPUT VOLTAGE (V) INPUT BIAS CURRENT () CURRENT IS POSITIVE GOING INTO THE DEVICE V < V IB < V T A = 55 C INPUT VOLTAGE (V) INPUT BIAS CURRENT (). CURRENT IS GOING INTO THE DEVICE. V IB > V INPUT VOLTAGE (V) 73 G 73 G7 73 G8 For more information 73fh

13 TYPICAL PERFORMANCE CHARACTERISTICS LT7/LT7HV OUTPUT SATURATION VOLTAGE () Output Saturation Votage vs Output Sink Current T A = C... OUTPUT SINK CURRENT (ma) 73 G9 OUTPUT SATURATION VOLTAGE () Output Saturation Votage vs Output Sink Current... OUTPUT SINK CURRENT (ma) 73 G OUTPUT SATURATION VOLTAGE () Output Saturation Votage vs Output Sink Current... OUTPUT SINK CURRENT (ma) 73 G Output Short-Circuit Current Output Short-Circuit Current Output Leakage Current 8 8 SHORT-CIRCUIT CURRENT (ma) T A = 55 C 8 8 OUTPUT VOLTAGE (V) SHORT-CIRCUIT CURRENT (ma) OUTPUT VOLTAGE (V) OUTPUT LEAKAGE CURRENT ().. T A = 55 C. 8 8 OUTPUT VOLTAGE (V) 73 G 73 G3 73 G PROPAGATION DELAY (µs) 5 3 Propagation Deay vs Input Overdrive LH NONINV HL NONINV LH INV HL INV 8 INPUT OVERDRIVE () 73 G5 RISE AND FALL TIME (µs).. Rise and Fa Times vs Output Pu-Up Resistor C L = pf. RISE FALL OUTPUT PULL-UP RESISTOR (kω) 73 G V O(NINV) 5V/DIV DC V O(INV) 5V/DIV DC V IN /DIV AC Noninverting and Inverting Comparator Propagation Deay = 5V µs/div R LOAD = k CONNNECTED TO V IN(OVERDRIVE) = OVER THE INPUT VOLTAGE THRESHOLDS 73 G7 For more information 73fh 3

14 LT7/LT7HV APPLICATIONS INFORMATION The LT7-/LT7-/LT7-3/LT7HV-/ LT7HV-/LT7HV-3 devices are a famiy of dua micropower comparators with a buit-in reference. Features incude wide suppy votage range (.V to 8V), Over-The-Top input and output range, % accurate rising input threshod votage and.5 typica buit-in hysteresis. The comparator s open-coector outputs can sink up to ma typica. Interna Reference Each of the comparator sections has one input avaiabe externay, with the three versions of the part differing by the poarity of those avaiabe inputs (i.e., inverting or noninverting). The other comparator inputs are connected internay to the reference. The rising input threshod votage of the comparators is designed to be equa to that of the reference (i.e., ). The reference votage is estabished with respect to the device connection. Hysteresis Each comparator has buit-in.5 (typica) hysteresis to simpify designs, ensure stabe operation in the presence of noise at the inputs, and to reject suppy rai noise that might be induced by state change oad transients. The hysteresis is designed such that the faing input threshod votage is nominay Externa positive feedback circuitry can be empoyed with noninverting comparator inputs to increase effective hysteresis if desired, but such circuitry wi provide an apparent effect on both the rising and faing input threshods (the actua interna threshods remain unaffected). Comparator Inputs A comparator input can swing from ground to 8V (3V for LT7HV), regardess of the suppy votage used. The typica input current for inputs we above threshod (i.e., >8) is a few pa eaking into an input. With decreasing input votage, a sma bias current begins to be drawn out of the input, reaching a few when at ground potentia. The input may be forced beow ground without causing an improper output, though some additiona bias current wi begin to fow from the parasitic ESD input protection diode. Inputs driven further negative than beow ground wi not cause comparator mafunction or damage (provided the current is imited to ma), but the accuracy of the reference cannot be guaranteed, in which case the output state of the aternate comparator may be affected. Comparator Outputs The comparator outputs are open coector and capabe of sinking ma typica. Load currents are directed out the pin of the part. The output off-state votage may range between.3v and 8V (3V for LT7HV) with respect to ground, regardess of the suppy votage used. When the output high state bias votage is above 8V, a k minimum pu-up resistor is required and tota oad capacitor must be ess than nf. If the output high state is above 8V, caution must be taken to prevent a short from the output directy to the bias votage, even if the output is in the off state. As with any open-coector device, the outputs may be tied together to impement wire-and ogic functions. Power Suppies The comparator famiy core circuitry operates from a singe.v to 8V suppy. A minimum.µf bypass capacitor is required between the pin and. When an output oad is connected to the suppy rai near the part and the output is sinking more than 5mA, a µf bypass capacitor is recommended. The votage reference buit into the LT7 can be susceptibe to high noise on the suppy ine, particuary noise that is ess than 5kHz and arger than P-P. In order to reduce the probabiity of a fase comparator output in the presence of high suppy noise, an RC fiter shoud be used to reduce the noise. This fiter can be created simpy by adding a series R between the system suppy and the LT7 pin, using the decouping capacitor to create a owpass response. It is recommended that the fiter have a time constant: t RC > V N / Where V N is the peak-peak suppy noise in miivots and t RC is miiseconds. This fiter wi aso increase the start-up time of the LT7 by reducing the rate at which the suppy can change. When For more information 73fh

15 APPLICATIONS INFORMATION using a suppy fiter, the start-up time of the LT7 wi increase to: t START = (.7ms.5 t RC ) Δ Where t START and t RC are in miiseconds and Δ is the change in suppy in vots. The ow suppy current of the LT7 shoud not cause significant votage drop due to a k maximum series R. Fexibe Window Comparator Using the LT7-/LT7HV- as shown in the circuits of Figure, the wire-and configuration permits high accuracy window functions to be impemented with a simpe 3-resistor votage divider network. The section A comparator provides the V L trip-point and the section B comparator provides the V H trip-point, with the buit-in hysteresis providing about.7% recovery eve at each trip point to prevent output chatter. For designs that are to be optimized to detect departure from a window imit, the nomina resistor divider vaues are seected as foows (refer to the resistor designators shown on the first circuit of Figure ): R k (this sets the divider current >> I B of inputs) R = R (.98 V H /V L ) R3 = R (.5 V H.98 V H /V L ) To create window functions optimized for detecting entry into a window (i.e., where the output is to indicate a coming into spec condition, as with the exampes in Figure ), LT7/LT7HV the nomina resistor vaues are seected as foows: R k (this sets the divider current >> I B of inputs) R = R (. V H /V L ) R3 = R (.5 V H. V H /V L ) The worst-case variance of the trip-points is reated to the specified threshod imits of the LT7/LT7HV device and the basic toerance of divider resistors used. For resistor toerance R TOL (e.g.. for %), the worstcase trip-point votage (either V H or V L ) deviations can be predicted as foows (itaicized vaues are taken from the data sheet, expressed in vots): Max dev V TRIP = ±V TRIPnom { R TOL [(V TRIPnom.) / V TRIPnom ].5 (V TH(R)max V TH(R)min )} Max dev V TRIP = ±V TRIPnom { R TOL [(V TRIPnom.39) / V TRIPnom ].7 (V TH(F)max V TH(F)min )} Generating an Externa Reference Signa In some appications, it woud be advantageous to have access to a signa that is directy reated to the interna reference, even though the reference itsef is not avaiabe externay. This can be accompished to a reasonabe degree by using an inverting comparator section as a bang-bang servo, estabishing a nomina votage, on an integration capacitor, that is scaed to the reference. This method is used in Figure, where the reference eve has been doubed to drive a resistor bridge. The section B output cyces on and off to swing the section B input between its hysteresis trip points as the oad capacitor 3.3uppy Monitor 5uppy Monitor 3.3V V L V H 5V.µF R3 3k R.k R.k INA OUTA LT7- INB OUTB 33k V OUT V OUT HIGH = (3.V < < 3.5V) HYSTERESIS ZONES APPROXIMATELY % OF TRIP VOLTAGE.µF 87k INA OUTA.k LT7- INB OUTB.k 33k 73 F V OUT HIGH = (.7V < < 5.3V) Figure. Simpe Window Comparator For more information 73fh 5

16 LT7/LT7HV APPLICATIONS INFORMATION 3.3µF R TH V REF R SET T.µF 99k k k* INA OUTA T < T SET LT7- k INB OUTB 99k 3.3µF 73 F R TH = M (e.g., YSI 5,.MΩ AT 5 C) R SET = R TH AT T SET *RESISTANCE MAY REQUIRE OPTIMIZATION FOR OPERATION OVER INTENDED R TH AND UPPLY RANGES HYSTERESIS ZONE. C.V TO 8V (I S ) Figure. Micropower Thermostat/Temperature Aarm charges and discharges in a shaow, controed fashion. The mutipied reference signa aso contains rippe that is the hysteresis mutipied by the same factor, so additiona fitering is performed at the sense node of the bridge to prevent comparator chatter in the section A comparator, which is performing the actua conditiona decision for the circuit. Instrumentation Grade Puse Width Moduator (PWM) Comparators with hysteresis are frequenty empoyed to make simpe osciator structures, and the LT7/ LT7HV ends itsef nicey to forming a charge-baancing PWM function. The circuit shown in Figure 3 forms a PWM that is intended to transmit an isoated representation of a votage difference, rather ike an isoated instrumentation ampifier. The section B comparator is used to generate a V reference suppy eve for the CMOS NOT gate (inverter), which serves as the precision switch eement for the charge baancer. The heart of the charge baancer is the section A comparator, which is detecting sight charge or discharge states on the.µf integration capacitor as it remains baanced at by feedback through the NOT gate. The input sense votage, V IN, is converted to an imbaance current that the NOT gate duty cyce is continuay correcting for, thus the digita waveform at the section A comparator output is a PWM representation of V IN with respect to the V fu scae. In this particuar circuit, the PWM information drives the LED of an opto-couper, aowing the V IN information to be couped across a dieectric barrier. As an additiona option to the circuit, the feedback oop can be broken and a second opto-couper empoyed to provide the charge baance management. This configuration aows for cocking the comparator output (externay to this circuit) and providing synchronous feedback such that a simpe votage-to-frequency conversion can be formed if desired. Approximatey -bit accuracy and noise performance was observed in a one second integration period for duty factors from % to 99%. 3V NOM (I S < 3mA) 3V/5V µf k** 5 V REF = V NC7S 39k* Lithium COIN CELL 7Ω k* INA OUTA.µF k k 75Ω 5 k PWM OUT (OR ΔΣ SENSE) MOC-7 V IN V TO V 39k*.µF k* k* LT7- INB OUTB k.µf 3V/5V 75** MOC-7** * % METAL FILM ** DELETE FOR PWM MODE CONNECT FOR PWM MODE OPTIMIZED FOR khz ΔΣ SAMPLING, f PWM(MAX).kHz 73 F3 Figure 3. Isoated PWM or Converter 5 ΔΣ SAMPLE IN For more information 73fh

17 PACKAGE INFORMATION DCB Package -Lead Pastic DFN (mm 3mm) (Reference LTC DWG # Rev A) LT7/LT7HV.7 ±.5.5 ± ±.5 ( SIDES).5 ±.5 PACKAGE OUTLINE.5 ±.5.5 BSC.35 ±.5 ( SIDES) RECOMMENDED SOLDER PAD PITCH AND DIMENSIONS. ±. ( SIDES) R =.5 TYP R =.5 TYP. ±. 3. ±. ( SIDES).5 ±. ( SIDES) PIN BAR TOP MARK (SEE NOTE ). REF.75 ±.5..5 PIN NOTCH R. OR.5 5 CHAMFER (DCB) DFN ±.5.5 BSC.35 ±. ( SIDES) BOTTOM VIEW EXPOSED PAD NOTE:. DRAWING TO BE MADE A JEDEC PACKAGE OUTLINE M-9 VARIATION OF (TBD). DRAWING NOT TO SCALE 3. ALL DIMENSIONS ARE IN MILLIMETERS. DIMENSIONS OF EXPOSED PAD ON BOTTOM OF PACKAGE DO NOT INCLUDE MOLD FLASH. MOLD FLASH, IF PRESENT, SHALL NOT EXCEED.5mm ON ANY SIDE 5. EXPOSED PAD SHALL BE SOLDER PLATED. SHADED AREA IS ONLY A REFERENCE FOR PIN LOCATION ON THE TOP AND BOTTOM OF PACKAGE For more information 73fh 7

18 LT7/LT7HV PACKAGE INFORMATION S Package -Lead Pastic TSOT-3 (Reference LTC DWG # 5-8-3). MAX.95 REF.9 BSC (NOTE ). REF 3.85 MAX. REF. MIN.8 BSC.5.75 (NOTE ) PIN ONE ID RECOMMENDED SOLDER PAD LAYOUT PER IPC CALCULATOR.95 BSC.3.5 PLCS (NOTE 3).8.9. BSC DATUM A. MAX REF.9. (NOTE 3) NOTE:. DIMENSIONS ARE IN MILLIMETERS. DRAWING NOT TO SCALE 3. DIMENSIONS ARE INCLUSIVE OF PLATING. DIMENSIONS ARE EXCLUSIVE OF MOLD FLASH AND METAL BURR 5. MOLD FLASH SHALL NOT EXCEED.5mm. JEDEC PACKAGE REFERENCE IS MO-93.9 BSC S TSOT-3 3 REV B 8 For more information 73fh

19 REVISION HISTORY (Revision history begins at Rev G) LT7/LT7HV REV DATE DESCRIPTION PAGE NUMBER G 5/ Power Suppies section updated Modified part number header for carity to H /3 Web hyperinks added Addition of MP grade in SOT3 package -, 3 Information furnished by Linear Technoogy Corporation is beieved to be accurate and reiabe. However, no responsibiity is assumed for its use. Linear Technoogy Corporation makes no representation that the interconnection For more of its circuits information as described herein wi not infringe on existing patent rights. 73fh 9

20 LT7/LT7HV TYPICAL APPLICATIONS PowerPath Controer WART INPUT 3.3V NOM Si3DS B5LW k UPPLY.V MIN 3V NOM ALKALINE AA CELLS M M INA OUTA k k V WART > 3.V LT7-3 R 5k R 9k INB OUTB µf 73 TA V BATT > V R = k/(v BATT AT LOW.) R = k/(v BATT AT MAX.) HYSTERESIS ZONES APPROXIMATELY % OF TRIP VOLTAGE PowerPath IS A TRADEMARK OF LINEAR TECHNOLOGY CORPORATION 8tatus Monitor.7M 33k V CMPZ55B LED OFF V OUT V L V H LED ON V IN HYSTERESIS ZONES APPROXIMATELY % OF TRIP VOLTAGE V IN 7.87k LT7-7k 33k k INA OUTA INB OUTB.µF 5.V CMPZ53B 73 TA3 3V/5V 5 MOC-7 V OUT LOW = (39V < V IN < 7V) RELATED PARTS PART NUMBER DESCRIPTION COMMENTS LT7/LT8 Micropower Dua Comparator.V (Min) Suppy Votage, ±. (Max) Input Offset LTC/LTC Micropower Dua Comparator with % Reference.8 ±% Reference, ± (Max) Input Offset LTC998 Micropower Comparator for Battery Monitoring.5 Typ Suppy Current, Adjustabe Threshod and Hysteresis LT73 Micropower Comparator with Reference.V to 8uppy Current,.5 Suppy Current Linear Technoogy Corporation 3 McCarthy Bvd., Mipitas, CA For more information (8) 3-9 FAX: (8) fh LT 3 REV H PRINTED IN USA LINEAR TECHNOLOGY CORPORATION 3