LTC1559CGN-3.3 Linear Technology, LTC1559CGN-3.3 Datasheet - Page 6

• Manufacturer Part Number: LTC1559CGN-3.3
• Description: IC BACKUP BATT CNTRLR3.3V 16SSOP
• Manufacturer: Linear Technology

Specifications of LTC1559CGN-3.3

• Function: Back-Up Management
• Battery Type: Nickel Cadmium (NiCd)
• Voltage - Supply: 2.9 V ~ 3.5 V
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 16-SSOP (0.150", 3.90mm Width)
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

SWITCHING WAVEFORMS
PIN
LTC1559-3.3/LTC1559-5
LOBAT (Pin 9): Low Backup Battery Detector Output. This
is an open-drain output with an internal weak pull-up. It is
asserted if the NiCd cell terminal voltage drops below
1.0V. This pin is pulled high if the LTC1559 is in trickle
charge mode.
BLOCK
6
Simplified LTC1559 Connections in a Battery Backup System
U
FUNCTIONS
FOR MORE DETAILED CIRCUIT APPLICATION SCHEMATICS,
PLEASE REFER TO THE TYPICAL APPLICATIONS SECTION
U
1.2V
NiCd
V
MAIN
BATTERY
SHDN
BAT
DIAGRAM
22 H
CTL
V
SW
U
PS
CC
SW
PS
BACKUP
V
V
MAIN SYSTEM
REF
IN
REGULATOR
U
LTC1559
–
+
RESET
W
V
V
V
V
BAK
OUT
REF
CC
–
+
Q
EXT
W
TO
SYSTEM
CONTROL
C
OUT
AND DEBOUNCE
LEVEL SENSE
SHUTDOWN
GAS GAUGE
THERMAL
CHARGER
LOGIC
LIMIT
BACKUP
SYSTEM
V
1559 SW01
CC
V
REF
BANDGAP
RESET (Pin 12): System Reset, Active High. This is a TTL-
compatible output driver. It can connect to systems that
require active high logic. The RESET output will go high if
RESET is pulled low.
= 1.272V
BACKUP
RESET
V
Cold Power Boot-Up (Main Battery Replaced/Turned On)
V
BAT
PS
CC
N1
–
+
GENERATOR
DETECTOR
RESET
UVLO
1559 BD
1
P1
BOOST/BACKUP
2
V
LOGIC
CC
/V
BAK
3
RATED BATTERY TERMINAL VOLTAGE
4
–5.5% (LTC1559-3.3)
– 6% (LTC1559-5)
200ms
RATED V
V
BACKUP
RESET
RESET
LOBAT
BAK
CC
VOLTAGE
1559 SW02