LTC1998CS6-TR View Datasheet(PDF) - Linear Technology
Part Name
Description
MFG CO.
LTC1998CS6-TR
Linear Technology
'LTC1998CS6-TR' PDF : 12 Pages View PDF
LTC1998
TYPICAL APPLICATIONS
Single Li-Ion Cell Low Battery Detector
VBATT =
1.5V TO 4.2V
+
R1
1%
R2
1%
R3
1%
REGULATOR
0.1μF 1
4
BATT
5
VH.A VLOGIC
LTC1998
3 VTH.A BATTLO 6
GND
2
VLOGIC =
1V TO 5V
μP
1998 TA01
Micropower 2.9V VCC Threshold
Detector with 15mV Hysteresis
3.3V
R1
715k
1
1% 4
BATT
5
VH.A VLOGIC
R2
9.09k
LTC1998
1% 3 VTH.A BATTLO 6 OUT
R3
GND
274k
1%
2
LOW THRESHOLD = 2.9V
HYSTERESIS = 15mV
1998 TA03
Low Battery Load Reduction Circuit
REGULATOR
R1
+ 787k
1
1% 4
BATT
5
VH.A VLOGIC
R2
68.1k
LTC1998
1% 3 VTH.A BATTLO 6
R3
GND
147k
1%
2
LOW THRESHOLD = 2.7V
HYSTERESIS = 100mV
Si2301
CRITICAL
CIRCUITRY
NONCRITICAL
CIRCUITRY
1998 TA05
Backup Battery Switchover Circuit
2.5V TO 4.2V
R1
+
787k
1% 4
1
BATT
5
VH.A VLOGIC
R2
68.1k LTC1998
1% 3 VTH.A BATTLO 6
R3
GND
147k
1%
2
MBRM120
BAT54C
R4
1M
BAT54C
+
VOUT
Si2301
Si2301
3V
BACKUP
BATTERY
SWITCHES TO BACKUP BATTERY WHEN PRIMARY FALLS BELOW 2.7V.
SWITCHES BACK TO PRIMARY WHEN VOLTAGE RECOVERS TO ≥ 2.8V 1998 TA04
High Accuracy Window Comparator
with Dual Hysteresis
VIN
V+
R1
619k
1
1% 4
BATT
5
VH.A VLOGIC
R2
6.04k
LTC1998
1% 3 VTH.A BATTLO 6
R3
GND
383k
1%
2
R7
1M
VOUT
2N7002 VOUT = V+ WHEN
2.6V ≤ VIN ≤ 3.1V
R4
909k
1
1% 4
BATT
5
VH.A VLOGIC NC
R5
6.98k
LTC1998
1% 3 VTH.A BATTLO 6
R6
GND
WINDOW LOW THRESHOLD = 2.6V
76.8k
1%
2
HYSTERESIS = 10mV
WINDOW HIGH THRESHOLD = 3.1V
HYSTERESIS = 10mV
1998 TA06
RELATED PARTS
PART NUMBER
LTC1440/LTC1540
LTC1441/LTC1442
LTC1443/LTC1444/LTC1445
DESCRIPTION
Micropower Comparator with 1% Reference
Micropower Dual Comparator with 1% Reference
Micropower Quad Comparator with 1% Reference
COMMENTS
1.182V ±1% Reference, ±10mV (Max) Input Offset
1.182V ±1% Reference (LTC1442)
LTC1443 has 1.182V Reference, LTC1444/LTC1445 have 1.221V
Reference and Adjustable Hysteresis
12 Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900 ● FAX: (408) 434-0507 ● www.linear.com
1998fa
LT 0108 REV A • PRINTED IN USA
© LINEAR TECHNOLOGY CORPORATION 2001
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