LT6700-1_09 Datasheet, PDF (1/20 Pages) Linear Technology – Micropower, Low Voltage, Dual Comparator with 400mV Reference

LT6700-1/LT6700-2/LT6700-3/
LT6700HV-1/LT6700HV-2/
LT6700HV-3
FEATURES
n _{Internal 400mV Reference}
n _{Total Threshold Error: ±1.25% Max at 25°C}
n _{Inputs and Outputs Operate to 36V}
n _{Wide Supply Range: 1.4V to 18V}
n _{Specified for –55°C to 125°C Temperature Range}
n _{Low Quiescent Current: 6.5μA Typ at 5V}
n _{Internal Hysteresis: 6.5mV Typ}
n _{Low Input Bias Current: ±10nA Max}
n _Over-The-Top^® _{Input also Includes Ground}
n _{Open-Collector Outputs Allow Level Translation}
n _{Choice of Input Polarities: LT6700-1/LT6700-2/}
LT6700-3/LT6700HV-1/LT6700HV-2/LT6700HV-3
n _{Available in Low Profile (1mm) SOT-23 (ThinSOT™)}
and 2mm × 3mm DFN Packages
APPLICATIONS
n _{Battery-Powered System Monitoring}
n _{Threshold Detectors}
n _{Window Comparators}
n _{Relay Driving}
n _{Industrial Control Systems}
n _{Handheld Instruments}
n _{Automotive Monitor and Controls}
L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation. Over-The-Top
is a registered trademark of Linear Technology Corporation. ThinSOT is a trademark of Linear
Technology Corporation. All other trademarks are the property of their respective owners.
Micropower, Low Voltage,
Dual Comparator with
400mV Reference
DESCRIPTION
The LT^®6700-1/LT6700-2/LT6700-3/LT6700HV-1/
LT6700HV-2/LT6700HV-3 combine two micropower, low
voltage comparators with a 400mV reference in a 6-lead
SOT-23 or tiny DFN package. Operating with supplies from
1.4V up to 18V, these devices draw only 6.5μA, making
them ideal for low voltage system monitoring. Hysteresis
is included in the comparators, easing design requirements
to insure stable output operation.
The comparators each have one input available externally;
the other inputs are connected internally to the reference.
The comparator outputs are open collector and the output
load can be referred to any voltage up to 18V (36V for
LT6700HV), independent of supply voltage. The output
stage sinking capability is guaranteed to be greater than
5mA over temperature.
The three versions of this part differ by the polar-
ity of the available comparator inputs. The LT6700-1/
LT6700HV-1 has one inverting input and one noninvert-
ing input, making it suitable for use as a window com-
parator. The LT6700-2/LT6700HV-2 has two inverting
inputs and the LT6700-3/LT6700HV-3 has two nonin-
verting inputs. All versions are offered in commercial,
industrial and automotive temperature ranges.
TYPICAL APPLICATION
+
ALKALINE
AA CELLS
+
Micropower Battery Monitor
V_BATT
1.4V (MIN)
3V (NOM)
1M ^LT6700-3
1M 1M
0.1μF
63.4k
+
COMP B
–
V_BATT > 1.6V
V_R = 400mV ^VS
REFERENCE
–
COMP A
+
261k
V_BATT > 2V
6700123 TA01
MONITOR CONSUMES ~10μA
HYSTERESIS IS APPROXIMATELY
2% OF TRIP VOLTAGE
Comparator Thresholds
vs Temperature
406
#1A
#2A
404
#1B
#2B
RISING INPUT
402
400
398
396
FALLING INPUT
394
TWO TYPICAL PARTS
392 _{COMP A AND B}
390 ^{VS = 5V}
–60 –40 –20 0 20 40 60 80 100 120
TEMPERATURE (°C)
6700123 TA02
6700123ff
1