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LTC6702 Tiny Micropower, Low Voltage Dual Comparators FEATURES
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DESCRIPTION
The LTC(R)6702 is an extremely small dual comparator designed to maximize battery life while providing both speed and low voltage operation in applications where board space is a premium. These comparators operate on supplies between 1.7V and 5.5V, and have a maximum guaranteed propagation delay of 500ns while drawing only 30A maximum quiescent current. Internal hysteresis desensitizes the LTC6702 to input noise and makes it easy to use, even with slow moving signals. CMOS inputs allow the use of large source impedances. The LTC6702 is available in the 8-pin SOT-23 and the tiny 2mm x 2mm DFN package.
L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners.
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Low Supply Operation: 1.7V Minimum Low Supply Current: 30A/Comparator Maximum Propagation Delay: 500ns Maximum (-40C to 125C) 3.2MHz Toggle Frequency Input Voltage Range Extends 100mV Below Ground Internal Hysteresis: 4mV High Output Drive: TTL and CMOS Compatible Specified at 15mA (-40C to 125C), Capacitive Load Handling to 10,000pF Specified for -40C to 125C Temperature Range Available in SOT-23 and 2mm x 2mm DFN Package
APPLICATIONS
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Battery Powered Systems Window Comparators Threshold Detectors/Discriminators Clock Regeneration Automotive Sensing and Controls
TYPICAL APPLICATION
Clock Regeneration Circuit
V
+ = 3V
Propagation Delay vs Input Overdrive
600 CLOAD = 10pF V+ = 5V VSTEP = 100mV TA = 25C FALLING 400 RISING 300
IN VR = 400mV REFERENCE
LT6650
+ -
OUT C1 0.1 F 1k
- +
RECOVERED CLOCK (UP TO 3.2MHz)
6702 TA01
0.1 F
FB
PROPAGATION DELAY (ns)
1/2 LTC6702
500
200
CLOCK INPUT > 100mVP-P
100 0 10 50 60 20 30 40 INPUT OVERDRIVE (mV) 70 80
6702 TA01b
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LTC6702 ABSOLUTE MAXIMUM RATINGS
(Note 1)
Supply Voltage (V+ to GND) ........................................6V Input Voltage...............................................................6V Input Current........................................................-10mA Output Short-Circuit Duration (Note 2) ............ Indefinite Operating Temperature Range (Note 3) LTC6702C ...........................................-40C to 85C LTC6702I .............................................-40C to 85C LTC6702H .........................................-40C to 125C Specified Temperature Range (Note 4)
LTC6702C ............................................... 0C to 70C LTC6702I .............................................-40C to 85C LTC6702H .........................................-40C to 125C Junction Temperature .......................................... 150C Storage Temperature Range...................-65C to 150C Lead Temperature (Soldering, 10 sec) TSOT Packages ................................................. 300C
PIN CONFIGURATION
TOP VIEW OUT A 1 -IN A 2 +IN A 3 GND 4 9
A B
8 V+ 7 OUT B 6 -IN B 5 +IN B OUT A -IN A +IN A GND
TOP VIEW V+ OUT B -IN B +IN B
DC PACKAGE 8-LEAD (2mm x 2mm) PLASTIC DFN TJMAX = 150C, JA = 102C/W EXPOSED PAD (PIN 9) IS GND, MUST BE SOLDERED TO PCB
TS8 PACKAGE 8-LEAD PLASTIC TSOT-23 TJMAX = 150C, JA = 130C/W
ORDER INFORMATION
Lead Free Finish
TAPE AND REEL (MINI) TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE 0C to 70C -40C to 85C -40C to 125C 0C to 70C -40C to 85C -40C to 125C LTC6702CDC#TRMPBF LTC6702CDC#TRPBF LCZJ 8-Lead (2mm x 2mm) Plastic DFN LTC6702IDC#TRMPBF LTC6702IDC#TRPBF LCZJ 8-Lead (2mm x 2mm) Plastic DFN LTC6702HDC#TRMPBF LTC6702HDC#TRPBF LCZJ 8-Lead (2mm x 2mm) Plastic DFN LTC6702CTS8#TRMPBF LTC6702CTS8#TRPBF LTCZK 8-Lead Plastic TSOT-23 LTC6702ITS8#TRMPBF LTC6702ITS8#TRPBF LTCZK 8-Lead Plastic TSOT-23 LTC6702HTS8#TRMPBF LTC6702HTS8#TRPBF LTCZK 8-Lead Plastic TSOT-23 TRM = 500 pieces. *Temperature grades are identified by a label on the shipping container. Consult LTC Marketing for parts specified with wider operating temperature ranges. Consult LTC Marketing for information on 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/
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LTC6702 ELECTRICAL CHARACTERISTICS
SYMBOL V+ I+ PARAMETER Supply Voltage Supply Current per Comparator
The l denotes the specifications which apply over the full specified , temperature range, otherwise specifications are at TA = 25C. V+ = 3V, VCM = 1.5V, COUT = 20pF unless otherwise noted.
CONDITIONS Guaranteed by PSRR V+ = 3V V+ = 5V
l l l l l l l l l l l l l l l l l l
MIN 1.7
TYP 24 25 1
MAX 5.5 30 40 32 42 3.5 5 6 6.2 7.2 8.2
UNITS V A A A A mV mV mV mV mV mV V/C nA nA nA dB dB
VOS
Input Offset Voltage
(Note 5) LTC6702C/LTC6702I LTC6702H (Note 5) LTC6702C/LTC6702I LTC6702H (Note 5) LTC6702C/LTC6702I LTC6702H
VHYST
Input Hysteresis Voltage
2.5 1.6 1.6
4.3
VOS /T IIN
Input Offset Voltage Drift Input Leakage Current
6 0.001 1 10 58 56 -0.1 56 54 65 70 VDD - 1.2
CMRR
Common Mode Rejection Ratio Input Voltage Range
VCM = -0.1V to VDD - 1.2V Guaranteed by CMRR V + = 1.7V to 5.5V, VCM = 0.5V Overdrive = 20mV (Note 6) ISINK = 100A ISINK = 15mA Overdrive = 20mV (Note 6) ISOURCE = 100A ISOURCE = 15mA (Note 7) Between Channels Between tPDLH /tPDHL
V dB dB
PSRR VOL
Power Supply Rejection Ratio Output Swing Low
10 250 10 350 320 4 4 11 15 3.2 450 500
mV mV mV mV mV mV ns ns ns ns ns ns MHz mA
VOH
Output Swing High
tPD tPD tSKEW tr tf fMAX ISC
Propagation Delay Differential Propagation Delay Propagation Delay Skew Output Rise Time Output Fall Time Maximum Toggle Frequency Short-Circuit Current
V + = 5V
250
Note 1: 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. Note 2: A heat sink may be required to keep the junction temperature below absolute maximum. This depends on the power supply voltage and how many comparators are shorted. The JA specified for the DC and TS packages is with minimal PCB heat spreading metal. Using expanded metal area on all layers of a board reduces this value. Note 3: The LTC6702C and LTC6702I are guaranteed functional over the temperature range of -40C to 85C. The LTC6702H is guaranteed functional over the operating temperature range of -40C to 125C. Note 4: The LTC6702C is guaranteed to meet specified performance from 0C to 70C. The LTC6702C is designed, characterized and expected to
meet specified performance from -40C to 85C but is not tested or QA sampled at these temperatures. The LTC6702I is guaranteed to meet specified performance from -40C to 85C. The LTC6702H is guaranteed to meet specified performance from -40C to 125C. Note 5: The LTC6702 comparators include internal hysteresis. The offset voltage is defined as the average of the input voltages (trip points) required to change the output in each direction minus VCM , while the hysteresis voltage is the difference of these trip points. Note 6: Output voltage swings are measured between the output and power supply rails. Note 7: Propagation delay is for 200mV steps, and 50mV of overdrive. Overdrive is measured relative to the positive and negative trip points.
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LTC6702 TYPICAL PERFORMANCE CHARACTERISTICS
Supply Current vs Supply Voltage
SUPPLY CURRENT PER COMPARATOR (A) SUPPLY CURRENT PER COMPARATOR (A) 50 35 V+ = 3V V+ = 5V V+ = 1.7V INPUT LEAKAGE CURRENT (nA) 30 25 20 15 10 5 0 -50 -25 4 125C 3 2 1 -55C 0 25C 50 25 75 0 TEMPERATURE (C) 100 125 -1 -1 0 3 2 1 4 INPUT VOLTAGE (V) 5 6
6702 G03
Supply Current vs Temperature
5
Input Leakage Current vs Input Voltage
V+ = 3V
40
30
125C 25C -55C
20
10
85C
0
0
1
2 3 4 SUPPLY VOLTAGE (V)
5
6
6702 G01
6702 G02
Input Offset Current vs Input Voltage
90 INPUT OFFSET CURRENT (pA) 80 70 60 50 40 30 20 10 0 -1 0 3 2 1 4 INPUT VOLTAGE (V) 5 6
6702 G04
Supply Current vs Toggle Rate
125C 85C 25C -55C SUPPLY CURRENT PER COMPARATOR (A) VSTEP = 200mV 400 OVERDRIVE = 100mV TA = 25C 350 NO CLOAD 300 250 200 150 100 50 0 10k V+ = 1.7V 100k 1M TOGGLE RATE (Hz) 10M
6702 G05
Maximum Toggle Rate vs Temperature
4 MAXIMUM TOGGLE RATE (MHz) VSTEP = 200mV OVERDRIVE = 100mV CLOAD = 10pF V+ = 3V
100
V+ = 3V
450
V+ = 5V V+ = 3V
3
V+ = 5V V+ = 1.7V
2 -50 -25
50 25 75 0 TEMPERATURE (C)
100
125
6702 G06
Input Offset Voltage vs Supply Voltage
5 4 INPUT OFFSET VOLTAGE (mV) 3 2 1 0 -1 -2 -3 -4 -5 1 2 4 5 3 SUPPLY VOLTAGE (V) 6
6702 G07
Hysteresis vs Supply Voltage
8 INPUT COMMON MODE LIMITS (V) 7 V+ V+ -0.5 V+ -1.0 V+ -1.5 GND -0.5
Input Common Mode Limits vs Temperature
25C 6 125C -55C HYSTERESIS (mV) 5 25C 4 3 2 1 0 1 2 5 4 SUPPLY VOLTAGE (V) 3 6
6702 G08
125C
-55C
-1.0 -50 -25
50 25 75 0 TEMPERATURE (C)
100
125
6702 G09
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LTC6702 TYPICAL PERFORMANCE CHARACTERISTICS
Propagation Delay vs Supply Voltage
420 400 PROPAGATION DELAY (ns) 380 360 340 320 300 280 RISING FALLING RISING FALLING 800 VSTEP = 100mV CLOAD = 10pF 25C, 125 -55C PROPAGATION DELAY (ns)
Propagation Delay vs Load Capacitance
VSTEP = 100mV OVERDRIVE = 50mV 700 TA = 25C 600 500 400 300 200 TIME (ns) 1000
Output Rise and Fall Times vs Load Capacitance
VSTEP = 100mV OVERDRIVE = 50mV TA = 25C
100 tf tr tr 10 FALLING RISING 1 10 100 1000 LOAD CAPACITANCE (pF) 10000
6702 G12
V+ = 1.7V FALLING RISING V+ = 3V, 5V 10
tf
tf tr V+ = 1.7V V+ = 3V V+ = 5V
1
2
5 4 SUPPLY VOLTAGE (V)
3
6
6702 G10
100 1000 LOAD CAPACITANCE (pF)
10000
6702 011
Output Low Voltage vs Load Current
1.0 TA = 25C OUTPUT VOLTAGE (V+-VOUT) (V) V+ = 1.7V OUTPUT VOLTAGE (V) V+ = 3V 1.0
Output High Voltage vs Load Current
TA = 25C V+ = 1.7V V+ = 3V OUTPUT VOLTAGE (mV) 90 80 70 60 50 40 30 20 10
Output Voltage vs Temperature
HIGH = V+ - VOUT IOUT = 4mA HIGH
0.1
0.1
V+ = 1.7V
LOW
0.01
V+ = 5V
V+ = 5V 0.01
HIGH LOW V+ = 5V
0.001 0.1 1 10 SINK CURRENT (mA) 100
6702 G13
0.001 0.1 1 10 SOURCE CURRENT (mA) 100
6702 G14
0 -50
-25
0 25 50 75 TEMPERATURE (C)
100
125
6702 G15
Propagation Delay
Propagation Delay with Load
10k
1MHz Sinusoid Response
VOUT 1V/DIV GND VIN 50mV/DIV
VOUT 1V/DIV 200 GND VIN 50mV/DIV
VOUT 1V/DIV GND VIN 50mV/DIV
100ns/DIV V+ = 3V CL = 20pF VCM = 500mV
6702 G16
V+ = 3V CL = 20pF
100ns/DIV VCM = 500mV RL = 10k, 200
6702 G17
200ns/DIV V+ = 3V CL = 20pF VCM = 500mV
6702 G18
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LTC6702 PIN FUNCTIONS
OUT A (Pin 1): Output of Comparator A. -IN A (Pin 2): Inverting Input of Comparator A. +IN A (Pin 3): Noninverting Input of Comparator A. GND (Pin 4): Ground. +IN B (Pin 5): Noninverting Input of Comparator B. -IN B (Pin 6): Inverting Input of Comparator B. OUT B (Pin 7): Output of Comparator B. V+ (Pin 8): Positive Supply Voltage Exposed Pad (Pin 9, DC Package Only): Ground. The Exposed Pad must be soldered to PCB.
SIMPLIFIED SCHEMATIC
V+
+IN
750
-IN
750 OUT
GND
6702 SS
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LTC6702 APPLICATIONS INFORMATION
The LTC6702 device is a fast (500ns delay), low power, low voltage (1.7V to 5.5V supply) general purpose dual comparator. It provides rail-to-rail outputs able to interface to TTL/CMOS, draws low supply currents (30A/comparator), and has internal hysteresis (approximately 4mV). Hysteresis Each comparator has built-in hysteresis to simplify designs, to insure stable operation in the presence of noise at the inputs, and to reject supply rail noise. The reference voltage applied to the input is not the exact switching threshold value due to the built-in hysteresis. Actual output switching typically occurs within 2.2mV of the reference voltage, plus or minus the input offset voltage. External positive feedback circuitry can be employed to increase effective hysteresis if desired as shown in Figure 1. This circuitry will provide an apparent effect on both the rising and falling input thresholds (the actual internal trip points remain unaffected). If an inverting configuration with hysteresis is needed, simply swap the VIN and VREF connections. Unused Inputs Any unused inputs should be connected in a way that fixes the output logic state high or low. One easy way to do this is to tie +IN to V+ and -IN to GND. Input Protection External input protection circuitry is only needed if currents would otherwise exceed the absolute maximum rating. Inputs driven further negative than 100mV below ground will not cause damage provided the current is limited to 10mA. ESD protection diodes are provided to prevent damage during handling. Comparator Input The allowable input voltage ranges from 100mV below GND to within 1.2V of the positive supply. The input may be forced below ground without causing an improper output, though some additional input current will begin to flow from the ESD input protection diode. The inputs can reach up to 6V independent of the V+ supply voltage without causing additional input current or damage to the part. As long as one input is within the allowable input voltage range, the LTC6702 will continue to function normally. Comparator Output The comparator output is a push-pull CMOS stage guaranteed to swing to within 350mV of V + and 250mV of ground, over temperature when sourcing or sinking 15mA. No external pull-up/down resistor is required. To
Additional Hystersis = Trip Voltages:
R3
R1 + *V R3 1 11 + + R1 R2 R3 11 1 + + R1 R2 R3 R1 * V+ R3
VIN(L VIN(H
H) = VREF L) = VREF
* R1 * * R1 *
VIN
R1
+
1/2 LTC6702 R2 VREF
-
6702 F01
Example: Additional Hysteresis = 50mV, V + = 5V R1= 10k R2 = 249k R3 = 1M FOR VREF = 0.5V : V IN (L H) = 0.525V V IN (H L) = 0.475V
Figure 1. Additional Hysteresis Circuit for Noninverting Configuration
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LTC6702 APPLICATIONS INFORMATION
maintain micropower operation, the output stage uses a break-before-make circuit. The break interval of this circuit turns off both the pull-up and pull-down devices for tens of nanoseconds before activating the appropriate output transistor (depends on the output transition direction). Any load connected to the output will charge or discharge internal capacitance during this interval. This can create a soft corner during output transitions and also decrease the propagation delay. The Typical Performance Characteristics section shows this behavior under three load conditions: unloaded, 10k to ground and 200 to ground. Loads to V+ have a similar affect when the output is transitioning from low to high. Power Supplies The comparator circuitry operates from a single 1.7V to 5.5V. A 0.1F minimum bypass capacitor is required between the V+ pin and GND. When the output is sinking at least 1mA, a 1F bypass capacitor is recommended. Pulsing the V+ supply to the comparators on and off may engage the ESD protection circuitry at the V+ pin. If this occurs, current is pulled from the V+ pin through the output stage. Using the recommended supply bypass capacitors with some series resistance in the V+ supply line will help to prevent this action in pulsed supply applications. Level Translators The level translators in the Typical Applications section show an adjustable high-precision voltage reference enabling the user to vary the threshold voltage. Simply adjusting the ratio of the two resistors changes the threshold voltage according to the following equation: VTHR = 0.4 1+ RF RG
TYPICAL APPLICATIONS
Low to High Level Translator
5.5V
LT6650 IN 0.1F GND FB OUT
500mV 24.9k 1F 100k 2V 0V
-
1/2 LTC6702 OUT
5.5V 0V
+
6702 TA02
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LTC6702 TYPICAL APPLICATIONS
High to Low Level Translator
1.8V
LT6650 IN 0.1F GND FB OUT
500mV 24.9k 1F 100k 6V 0V
-
1/2 LTC6702 OUT
1.8V 0V
+
6702 TA03
Micropower Battery Monitor with Fast Response
VBATT
R1 909k
LTC6702
+
LT1790-1.25 IN C1 0.1F R2 332k 0.1F GND OUT 1F COMPB OUTB (0V IF VBATT < 2.1V)
-
-
COMPA OUTA (0V IF VBATT < 2.8V)
+
R3 1M
6702 TA04
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LTC6702 PACKAGE DESCRIPTION
DC Package 8-Lead Plastic DFN (2mm x 2mm)
(Reference LTC DWG # 05-08-1719 Rev O)
0.70 0.05 2.55 0.05 1.15 0.05 0.64 0.05 (2 SIDES) PACKAGE OUTLINE
0.25 0.05 0.45 BSC 1.37 0.05 (2 SIDES) RECOMMENDED SOLDER PAD PITCH AND DIMENSIONS APPLY SOLDER MASK TO AREAS THAT ARE NOT SOLDERED R = 0.05 TYP 2.00 0.10 (4 SIDES)
R = 0.115 TYP 5
8 0.40 0.10 PIN 1 NOTCH R = 0.20 OR 0.25 x 45 CHAMFER
(DC8) DFN 0106 REVO
PIN 1 BAR TOP MARK (SEE NOTE 6)
0.64 0.10 (2 SIDES)
4 0.200 REF 0.75 0.05 1.37 0.10 (2 SIDES) 0.00 - 0.05
1 0.23 0.05 0.45 BSC
BOTTOM VIEW--EXPOSED PAD
NOTE: 1. DRAWING IS NOT A JEDEC PACKAGE OUTLINE 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
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LTC6702 PACKAGE DESCRIPTION
TS8 Package 8-Lead Plastic TSOT-23
(Reference LTC DWG # 05-08-1637)
0.52 MAX
0.65 REF
2.90 BSC (NOTE 4)
1.22 REF
3.85 MAX 2.62 REF
1.4 MIN
2.80 BSC
1.50 - 1.75 (NOTE 4) PIN ONE ID
RECOMMENDED SOLDER PAD LAYOUT PER IPC CALCULATOR
0.65 BSC
0.22 - 0.36 8 PLCS (NOTE 3)
0.80 - 0.90 0.20 BSC DATUM `A' 1.00 MAX 0.01 - 0.10
0.30 - 0.50 REF
NOTE: 1. DIMENSIONS ARE IN MILLIMETERS 2. DRAWING NOT TO SCALE 3. DIMENSIONS ARE INCLUSIVE OF PLATING 4. DIMENSIONS ARE EXCLUSIVE OF MOLD FLASH AND METAL BURR 5. MOLD FLASH SHALL NOT EXCEED 0.254mm 6. JEDEC PACKAGE REFERENCE IS MO-193
0.09 - 0.20 (NOTE 3)
1.95 BSC
TS8 TSOT-23 0802
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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.
11
LTC6702 TYPICAL APPLICATION
Dual Low Side Current Sense Alarm
5.5V
LTC6702
V+
LED B 1k
LOAD B ILOADB RSB 0.1 0.1 F LT6650 IN GND FB OUT 500mV 1F 24.9k
-
COMP B
+
LED A 1k
37.4k
+
61.9k LOAD A ILOADA RSA 0.1 COMP A
-
GND
6702 TA05
LEDA ON IF ILOADA > 2.5A LEDB ON IF ILOADB > 5.0A
RELATED PARTS
PART NUMBER LTC1441/LTC1442 LTC1541/LTC1542 LTC1842/LTC1843 LT6660 LT6700-1/LT6700-2/ LT6700-3 LT6703-2/LT6703-3 DESCRIPTION Dual Ultralow Power Comparators with Reference Micropower Amplifier with Comparator and Reference Dual Ultralow Power Comparators with Reference Tiny Micropower Precision Series References Dual Comparators with 400mV Reference Tiny Single Comparator with 400mV Reference COMMENTS 1.182V 1% Reference, 8s Propagation Delay, 5.7A 1.2V 0.8% Reference, Amplifier Stable with 1000pF Load 1.182V 1% Reference, 4s, 3.5A, Open-Drain Out 0.2% Reference, 20ppm/C Drift, 20mA Output, 2mm x 2mm DFN Package 1.4V to 18V Operating Range, 18s Propagation Delay, SOT-23 Package 1.4V to 18V Operating Range, 18s Propagation Delay, 2mm x 2mm DFN Package
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12 Linear Technology Corporation
(408) 432-1900 FAX: (408) 434-0507
LT 0907 * PRINTED IN USA
1630 McCarthy Blvd., Milpitas, CA 95035-7417
www.linear.com
(c) LINEAR TECHNOLOGY CORPORATION 2007

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