LTC1842IS8 반도체 회로 부품 판매점
Ultralow Power Dual Comparators with Reference
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 Linear Technology |
LTC1841/LTC1842/LTC1843
Ultralow Power Dual
Comparators with Reference
FEATURES
s Ultralow Quiescent Current: 3.5µA Typ
s Open-Drain Outputs Typically Sink
Greater Than 20mA
s Wide Supply Range: (LTC1841)
Single: 2V to 11V
Dual: ±1V to ±5.5V
s Input Voltage Range Includes the Negative Supply
s Reference Output Drives 0.01µF Capacitor
s Adjustable Hysteresis
s 12µs Propagation Delay with 10mV Overdrive
s No Current Spike When Switching
U
APPLICATIONS
s Battery-Powered System Monitoring
s Threshold Detectors
s Window Comparators
s Oscillator Circuits
, LTC and LT are registered trademarks of Linear Technology Corporation.
DESCRIPTION
The LTC®1841/LTC1842/LTC1843 are ultralow power dual
comparators with built-in reference (LTC1842/LTC1843).
The comparators feature less than 5.7µA supply current
over temperature, a 1.182V ±1% reference, program-
mable hysteresis and open-drain outputs that sink cur-
rent. The reference output can drive a bypass capacitor of
up to 0.01µF without oscillation.
The LTC1841 operates from a single 2V to 11V supply or
a dual ±1V to ±5.5V supply. The LTC1842/LTC1843
operate from a single 2.5V to 11V supply or a dual ±1.25V
to ±5.5V supply. The LTC1842/LTC1843 hysteresis is
easily programmed by using two resistors and the HYST
pin. The comparators’ input operates from the negative
supply to within 1.3V of the positive supply. The compara-
tors’ output stage can typically sink greater than 20mA. By
eliminating the cross-conduction current that normally
happens when the comparators change logic states, power
supply glitches are eliminated.
The LTC1841/LTC1842/LTC1843 are available in SO-8
packages.
TYPICAL APPLICATION
Single Li-Ion Cell to 5V Supply
1-CELL
Li-Ion
BATTERY
R1
1.5M
+ C1
100µF
4 IN B –
7
VCC
–
R2 +
100k
3 IN A+
+
R3
1M 6 REF –
R4
20k
R5
1.1M
V–
2
R6
25k
L1
10µH
D1
LTC1843
OUT B 8
OUT A 1
67
VIN SW
3 LT1302-5
Si9924DY
SHDN
8
IT 4
PGND SENSE
VC GND
21
RC
20k
CC
0.0µF
OUTPUT
5V
600mA
+
C2
100µF
R7
500k
HYST
5
C1, C2: SANYO OS-CON
D1: MOTOROLA MBRS130LT3
L1: COILTRONICS CTX10-3
LBO
1841/43 TA01
LTC1843 Supply Current
vs Supply Voltage
5
TA = 25°C
4
3
2
1
0
0 2 4 6 8 10 12
SUPPLY VOLTAGE (V)
1841/43 TA02
1
LTC1841/LTC1842/LTC1843
ABSOLUTE MAXIMUM RATINGS
(Note 1)
Voltage
V + 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 ................................................ 12V 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
LTC1841C/LTC1842C/LTC1843C ........... 0°C to 70°C
LTC1841I/LTC1842I/LTC1843I .......... – 40°C to 85°C
Storage Temperature Range ................ – 65°C to 150°C
Lead Temperature (Soldering, 10 sec).................. 300°C
PACKAGE/ORDER INFORMATION
TOP VIEW
OUT A 1
V– 2
IN A+ 3
IN A– 4
8 OUT B
7 V+
6 IN B+
5 IN B–
S8 PACKAGE
8-LEAD PLASTIC SO
TJMAX = 150°C, θJA = 125°C/ W
ORDER PART
NUMBER
S8 PART
MARKING
LTC1841CS8
LTC1841IS8
1841
1841I
Consult factory for Military grade parts.
TOP VIEW
OUT A 1
V– 2
IN A+ 3
IN B+ 4
8 OUT B
7 V+
6 REF
5 HYST
S8 PACKAGE
8-LEAD PLASTIC SO
TJMAX = 150°C, θJA = 125°C/ W
ORDER PART
NUMBER
S8 PART
MARKING
LTC1842CS8
LTC1842IS8
1842
1842I
TOP VIEW
OUT A 1
V– 2
IN A+ 3
IN B– 4
8 OUT B
7 V+
6 REF
5 HYST
S8 PACKAGE
8-LEAD PLASTIC SO
TJMAX = 150°C, θJA = 125°C/ W
ORDER PART
NUMBER
S8 PART
MARKING
LTC1843CS8
LTC1843IS8
1843
1843I
ELECTRICAL CHARACTERISTICS V+ = 5V, V– = 0V, TA = 25°C unless otherwise noted.
SYMBOL PARAMETER
Power Supply
V + Supply Voltage Range
ICC Supply Current
Comparator
VOS Comparator Input Offset Voltage
IIN Input Leakage Current (IN +, IN –)
VIN
PSRR
Comparator Input Voltage Range
Power Supply Rejection Ratio
CMRR Common Mode Rejection Ratio
VHYST Hysteresis Input Voltage Range
CONDITIONS
LTC1841
LTC1842/LTC1843
HYST = REF (Note 2)
(Note 3)
IN + = IN – = 2.5V (LTC1841),
IN + = IN – = VREF (LTC1842/LTC1843)
V + = 2V to 11V (LTC1841),
V + = 2.5V to 11V (LTC1842/LTC1843)
VCM = V– to (V+ – 1.3V) LTC1841
LTC1842/LTC1843
MIN TYP
q 2.0
q 2.5
q
3.5
q ±3
q ±0.01
q V–
0.1
q
q VREF – 50mV
0.1
MAX
11
11
5.7
± 10
± 1.0
V + – 1.3V
1
1
VREF
UNITS
V
V
µA
mV
nA
V
mV/V
mV/V
V
2
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