For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
Cache-Memory Battery-Backup Management IC
DS2731
ABSOLUTE MAXIMUM RATINGS
Voltage Range on CGND1, CGND2, and
SGND Pins Relative to AGND ...........................-0.3V to +0.3V
Voltage Range on VIN, CHG1, CHG2, and
CGATE Pins Relative to AGND........................-0.3V to +16.0V
Voltage Range on CHARGE, FAULT, and
DONE Pins Relative to AGND .........................-0.3V to +16.0V
Voltage Range on Any Other Pin Relative
to AGND ............................................................-0.3V to +6.0V
Continuous Sink Current on VIN, CGND1,
CGND2, SGND, AUX, BATT+ Pins ......................750mA each
Continuous Source Current on CHG1,
CHG2, and LX Pins ..............................................750mA each
Continuous Sink Current on CHARGE,
FAULT, and DONE Pins .........................................20mA each
Operating Temperature Range ...........................-40°C to +85°C
Storage Temperature Range .............................-55°C to +125°C
Soldering Temperature...........................Refer to the IPC/JEDEC
J-STD-020 Specification.
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
RECOMMENDED OPERATING CONDITIONS
(V
IN
= +10.8V to +13.2V, T
A
= -20°C to +70°C, unless otherwise noted. Typical values are at T
A
= +25°C.)
PARAMETER
Charger Supply Voltage
Auxiliary Supply Voltage
Battery Voltage
LED Voltage
(CHARGE, FAULT, DONE Pins)
Charger Enable (ENC)
Switcher Enable (ENS)
SYMBOL
V
IN
V
AUX
V
BATT+
(Note 1)
(Note 1)
Operating as input (Note 1)
(Note 1)
(Notes 1, 2)
(Notes 1, 2)
CONDITIONS
MIN
10.8
3.0
2.7
0
0
0
TYP
12.0
MAX
13.2
3.6
5.0
V
IN
+ 0.3
V
CBIAS
+ 0.3
V
CIN
+ 0.3
UNITS
V
V
V
V
V
V
CHARGER CIRCUIT ELECTRICAL CHARACTERISTICS
(V
IN
= +10.8V to +13.2V, T
A
= -20°C to +70°C, unless otherwise noted. Typical values are at T
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