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LTC1843C Datasheet

  • LTC1843C

  • Linear Technology [Ultralow Power Dual Comparators with Ref...

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LTC1841/LTC1842/LTC1843
Ultralow Power Dual
Comparators with Reference
FEATURES
s
s
DESCRIPTION
The LTC
廬
1841/LTC1842/LTC1843 are ultralow power dual
comparators with built-in reference (LTC1842/LTC1843).
The comparators feature less than 5.7碌A supply current
over temperature, a 1.182V
鹵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碌F without oscillation.
The LTC1841 operates from a single 2V to 11V supply or
a dual
鹵1V
to
鹵5.5V
supply. The LTC1842/LTC1843
operate from a single 2.5V to 11V supply or a dual
鹵1.25V
to
鹵5.5V
supply. The LTC1842/LTC1843 hysteresis is
easily programmed by using two resistors and the HYST
pin. The comparators鈥?input operates from the negative
supply to within 1.3V of the positive supply. The compara-
tors鈥?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.
s
s
s
s
s
s
Ultralow Quiescent Current: 3.5
碌
A Typ
Open-Drain Outputs Typically Sink
Greater Than 20mA
Wide Supply Range: (LTC1841)
Single: 2V to 11V
Dual:
鹵1V
to
鹵5.5V
Input Voltage Range Includes the Negative Supply
Reference Output Drives 0.01
碌
F Capacitor
Adjustable Hysteresis
12碌s Propagation Delay with 10mV Overdrive
No Current Spike When Switching
APPLICATIONS
s
s
s
s
Battery-Powered System Monitoring
Threshold Detectors
Window Comparators
Oscillator Circuits
, LTC and LT are registered trademarks of Linear Technology Corporation.
TYPICAL APPLICATION
Single Li-Ion Cell to 5V Supply
1-CELL
Li-Ion
BATTERY
R1
1.5M
+
C1
100碌F
R6
25k
7
V
CC
LTC1843
OUT B 8
6
L1
10碌H
7
D1
SUPPLY CURRENT (碌A)
3 IN A
+
R3
1M
6 REF
鈥?/div>
V
2
鈥?/div>
R4
20k
R5
1.1M
+
R2
100k
鈥?/div>
4 IN B
鈥?/div>
V
IN
SW
LT1302-5
Si9924DY
3
SHDN
I
T
8
4
PGND SENSE
V
C
GND
2
R
C
20k
C
C
0.0碌F
1
OUTPUT
5V
600mA
+
C2
100碌F
+
OUT A 1
R7
500k
LBO
1841/43 TA01
HYST
5
C1, C2: SANYO OS-CON
D1: MOTOROLA MBRS130LT3
L1: COILTRONICS CTX10-3
U
U
U
LTC1843 Supply Current
vs Supply Voltage
5
T
A
= 25擄C
4
3
2
1
0
0
2
6
8
4
SUPPLY VOLTAGE (V)
10
12
1841/43 TA02
1

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