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LTC1843 Datasheet(PDF) 1 Page - Linear Technology

Part # LTC1843
Description  Ultralow Power Dual Comparators with Reference
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC1843 Datasheet(HTML) 1 Page - Linear Technology

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1
LTC1841/LTC1842/LTC1843
Ultralow Power Dual
Comparators with Reference
LTC1843 Supply Current
vs Supply Voltage
SUPPLY VOLTAGE (V)
0
3
4
5
8
1841/43 TA02
2
1
0
2
4
6
10
12
TA = 25°C
The LTC
®1841/LTC1842/LTC1843 are ultralow power dual
comparators with built-in reference (LTC1842/LTC1843).
The comparators feature less than 5.7
µA 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 0.01
µF 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.
FEATURES
DESCRIPTION
s
Ultralow Quiescent Current: 3.5
µA 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 0.01
µF Capacitor
s
Adjustable Hysteresis
s
12
µs Propagation Delay with 10mV Overdrive
s
No Current Spike When Switching
R4
20k
RC
20k
CC
0.0
µF
R7
500k
OUTPUT
5V
600mA
LBO
R5
1.1M
R3
1M
R2
100k
R1
1.5M
C1
100
µF
1-CELL
Li-Ion
BATTERY
R6
25k
7
8
67
D1
L1
10
µH
4
8
3
1
2
1
6
C1, C2: SANYO OS-CON
D1: MOTOROLA MBRS130LT3
L1: COILTRONICS CTX10-3
25
1841/43 TA01
3
4
+
C2
100
µF
Si9924DY
+
+
VCC
OUT B
LTC1843
OUT A
REF
V
HYST
IN A+
IN B
VIN
SW
LT1302-5
SHDN
PGND
IT
SENSE
VC
GND
TYPICAL APPLICATION
Single Li-Ion Cell to 5V Supply
, LTC and LT are registered trademarks of Linear Technology Corporation.
APPLICATIONS
s
Battery-Powered System Monitoring
s
Threshold Detectors
s
Window Comparators
s
Oscillator Circuits


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