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LTC1842

更新时间： 2024-11-17 22:39:51
品牌 Logo 应用领域
凌特 - Linear 比较器
页数 文件大小 规格书
12页 252K
描述
Ultralow Power Dual Comparators with Reference

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中文翻译

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LTC1842 数据手册

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LTC1841/LTC1842/LTC1843  
Ultralow Power Dual  
Comparators with Reference  
U
FEATURES  
DESCRIPTION  
TheLTC®1841/LTC1842/LTC1843areultralowpowerdual  
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.  
■
Ultralow Quiescent Current: 3.5µA Typ  
Open-Drain Outputs Typically Sink  
Greater Than 20mA  
■
■
Wide Supply Range: (LTC1841)  
Single: 2V to 11V  
Dual: ±1V to ±5.5V  
■
■
■
■
■
Input Voltage Range Includes the Negative Supply  
Reference Output Drives 0.01  
µF Capacitor  
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  
happenswhenthecomparatorschangelogicstates,power  
supply glitches are eliminated.  
Adjustable Hysteresis  
12µs Propagation Delay with 10mV Overdrive  
No Current Spike When Switching  
U
APPLICATIONS  
■
Battery-Powered System Monitoring  
■
Threshold Detectors  
■
Window Comparators  
Oscillator Circuits  
■
The LTC1841/LTC1842/LTC1843 are available in SO-8  
packages.  
, LTC and LT are registered trademarks of Linear Technology Corporation.  
U
TYPICAL APPLICATION  
Single Li-Ion Cell to 5V Supply  
LTC1843 Supply Current  
vs Supply Voltage  
1-CELL  
+
L1  
10µH  
R6  
25k  
C1  
100µF  
Li-Ion  
D1  
5
BATTERY  
7
T
= 25°C  
A
6
7
T
R1  
V
LTC1843  
OUT B  
CC  
OUTPUT  
5V  
1.5M  
–
V
SW  
–
+
4
IN B  
IN  
4
3
2
1
0
600mA  
LT1302-5  
SHDN  
PGND SENSE  
Si9924DY  
8
1
3
8
I
4
R2  
100k  
+
C2  
100µF  
V
GND  
C
2
R
20k  
1
+
3
6
IN A  
C
R7  
500k  
+
–
–
OUT A  
R3  
1M  
C
C
0.0µF  
REF  
LBO  
1841/43 TA01  
C1, C2: SANYO OS-CON  
D1: MOTOROLA MBRS130LT3  
L1: COILTRONICS CTX10-3  
R4  
20k  
R5  
1.1M  
0
2
4
6
8
10  
12  
V
HYST  
5
SUPPLY VOLTAGE (V)  
2
1841/43 TA02  
1
1234567...12

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