LTC1998CS6 Linear Technology, LTC1998CS6 Datasheet - Page 12

• Manufacturer Part Number: LTC1998CS6
• Manufacturer: Linear Technology

Specifications of LTC1998CS6

• Operating Temperature (min): 0C
• Operating Temperature (max): 70C
• Operating Temperature Classification: Commercial
• Mounting: Surface Mount
• Pin Count: 6
• Lead Free Status / RoHS Status: Not Compliant

LTC1998
TYPICAL APPLICATIONS
RELATED PARTS
PART NUMBER
LTC1440/LTC1540
LTC1441/LTC1442
LTC1443/LTC1444/LTC1445
12
+
1.5V TO 4.2V
R1
787k
1%
R2
68.1k
1%
R3
147k
1%
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
[phone]
+
V
Single Li-Ion Cell Low Battery Detector
BATT
LOW THRESHOLD = 2.7V
HYSTERESIS = 100mV
4
3
Low Battery Load Reduction Circuit
1%
=
R1
1%
1%
R2
R3
V
V
H.A
TH.A
Micropower 2.9V V
LTC1998
Detector with 15mV Hysteresis
BATT
GND
BATTLO
V
4
3
1
2
LOGIC
0.1μF
●
V
V
R1
715k
1%
R2
9.09k
1%
R3
274k
1%
FAX: [phone]
H.A
TH.A
REGULATOR
LTC1998
LOW THRESHOLD = 2.9V
DESCRIPTION
Micropower Comparator with 1% Reference
Micropower Dual Comparator with 1% Reference
Micropower Quad Comparator with 1% Reference
BATT
6
5
GND
HYSTERESIS = 15mV
4
3
BATTLO
V
1
2
V
V
LOGIC
H.A
TH.A
LTC1998
REGULATOR
BATT
3.3V
GND
BATTLO
6
5
V
1
2
CC
LOGIC
Threshold
6
5
●
www.linear.com
OUT
V
1V TO 5V
Si2301
LOGIC
NONCRITICAL
CIRCUITRY
1998 TA03
μP
=
1998 TA01
CRITICAL
CIRCUITRY
1998 TA05
SWITCHES TO BACKUP BATTERY WHEN PRIMARY FALLS BELOW 2.7V.
SWITCHES BACK TO PRIMARY WHEN VOLTAGE RECOVERS TO ≥ 2.8V
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
2.5V TO 4.2V
+
R1
619k
1%
R2
6.04k
1%
R3
383k
1%
R4
909k
1%
R5
6.98k
1%
R6
76.8k
1%
R1
787k
1%
R2
68.1k
1%
R3
147k
1%
Backup Battery Switchover Circuit
High Accuracy Window Comparator
4
3
4
3
4
3
V
V
V
V
V
V
H.A
TH.A
H.A
TH.A
H.A
TH.A
LTC1998
LTC1998
LTC1998
BATT
with Dual Hysteresis
BATT
BATT
GND
GND
GND
BATTLO
BATTLO
BATTLO
V
V
V
1
2
1
2
1
2
LOGIC
LOGIC
LOGIC
© LINEAR TECHNOLOGY CORPORATION 2001
6
5
5
6
5
6
WINDOW LOW THRESHOLD = 2.6V
HYSTERESIS = 10mV
WINDOW HIGH THRESHOLD = 3.1V
HYSTERESIS = 10mV
V
NC
IN
1M
R4
BAT54C
BAT54C
2N7002
LT 0809 REV B • PRINTED IN USA
MBRM120
V
+
R7
1M
V
2.6V ≤ V
OUT
V
+
OUT
= V
Si2301
Si2301
IN
+
3V
BACKUP
BATTERY
V
1998 TA06
WHEN
≤ 3.1V
OUT
1998 TA04
1998fb