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LTC1558-3.3 Datasheet(PDF) 6 Page - Linear Technology

Part # LTC1558-3.3
Description  Backup Battery Controller with Programmable Output
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC1558-3.3 Datasheet(HTML) 6 Page - Linear Technology

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LTC1558-3.3/LTC1558-5
PIN FUNCTIONS
LOBAT (Pin 9): Low-Battery Detector Output. This is an
open-drain output that pulls low when the backup cell
drops below 1V. It gives early warning to the system
controller that the backup cell is getting weak. This pin is
disabled when the LTC1558 is in trickle charge mode.
RESET (Pin 12): System Reset, Active High. This is a TTL-
compatible output driver. It can be used to connect to
systems that require active high logic. The RESET output
will go high whenever RESET is pulled low. If RESET is
externally pulled low, RESET will go high.
VBAT
BACKUP
RESET
VCC
VBAK
1558 SW02
200ms
RATED BATTERY TERMINAL VOLTAGE
RATED VCC VOLTAGE
–6%
1
2
3
4
SWITCHING WAVEFORMS
LEVEL SENSE
AND DEBOUNCE
THERMAL
LIMIT
SHUTDOWN
LOGIC
BANDGAP
VREF = 1.272V
CHARGER
RESET
GENERATOR
BOOST/BACKUP
LOGIC
GAS GAUGE
VREF
VREF
VCC
SHDN
FB
RESET
N1
P1
VBAK
VCC/VBAK
CTL
SW
–
+
–
+
UVLO
DETECTOR
RESET
BACKUP
LOBAT
1558 BD
BLOCK DIAGRAM
+
R1
1558 SW01
VBAT
MAIN
BATTERY
CIN
MULTIPLE
POWER
OUTPUTS
R2
1.2V
NiCd
SW
LTC1558
RESET
VBAK
QEXT
VCC
BACKUP
TO
SYSTEM
CONTROL
FB
VIN
FOR MORE DETAILED APPLICATION SCHEMATICS
PLEASE REFER TO THE TYPICAL APPLICATIONS SECTION
MAIN SYSTEM
REGULATOR
Simplified LTC1558 Connections in a
Battery Backup System
Cold Power Boot-Up (Main Battery Replaced/Turned On)


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