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PDF LTC1841IS8 Data sheet ( Hoja de datos )
| Número de pieza | LTC1841IS8 | |
| Descripción | Ultralow Power Dual Comparators with Reference | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
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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
1 page  
LTC1841/LTC1842/LTC1843
TYPICAL PERFORMANCE CHARACTERISTICS
LTC1842/LTC1843
Hysteresis Control
80
60
OUTPUT HIGH
40
20
0
–20 OUTPUT LOW
–40
–60
–80
0
10 20 30 40
VREF – VHYST (mV)
50
1440/1/2/3 G07
LTC1842/LTC1843
Supply Current vs Temperature
4.5
4.0
V+ = 5V
V– = –5V
3.5
3.0 V+ = 5V
V– = 0V
2.5 V+ = 3V
V– = 0V
2.0
–60 –40 –20 0 20 40 60 80 100 120 140
TEMPERATURE (°C)
1440/1/2/3 G08
Reference Output Voltage vs
Output Load Current
1.190
1.185
VCC = 5V
SOURCE
1.180
1.175
1.170
1.165
1.160
Reference Output Voltage vs Output
Load Current (Sink)
1.200
1.195
VCC = 2V
VCC = 5V
1.190
1.185
1.180
SINK
1.175
1.155
0
0.5 1.0 1.5 2.0 2.5 3.0 3.5
OUTPUT LOAD CURRENT (mA)
1841/2/3 G09
1.170
0
5 10 15 20 25
OUTPUT LOAD CURRENT (µA)
30
1440/1/2/3 G10
Reference Voltage vs
Temperature
1.186
1.184
1.182
1.180
1.178
1.176
1.174
1.172
1.170
–60 –40 –20 0 20 40 60 80 100 120 140
TEMPERATURE (°C)
1440/1/2/3 G11
5
5 Page 
LTC1841/LTC1842/LTC1843
PACKAGE DESCRIPTION Dimensions in inches (millimeters) unless otherwise noted.
S8 Package
8-Lead Plastic Small Outline (Narrow 0.150)
(LTC DWG # 05-08-1610)
0.189 – 0.197*
(4.801 – 5.004)
8 765
0.228 – 0.244
(5.791 – 6.197)
0.150 – 0.157**
(3.810 – 3.988)
0.010
(0.254
–
–
0.020
0.508)
×
45°
0.008 – 0.010
(0.203 – 0.254)
1
0°– 8° TYP
0.053 – 0.069
(1.346 – 1.752)
2
0.016 – 0.050
0.406 – 1.270
0.014 – 0.019
(0.355 – 0.483)
*DIMENSION DOES NOT INCLUDE MOLD FLASH. MOLD FLASH
SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE
**DIMENSION DOES NOT INCLUDE INTERLEAD FLASH. INTERLEAD
FLASH SHALL NOT EXCEED 0.010" (0.254mm) PER SIDE
34
0.004 – 0.010
(0.101 – 0.254)
0.050
(1.270)
TYP
SO8 0996
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen-
tation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
11
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet LTC1841IS8.PDF ] | |
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