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LM3658SD-LM3658SDX
Dual Source USB/AC Li Chemistry Charger IC for Portable Applications
LM3658
Dual Source USB/AC Li Chemistry Charger IC for
Portable Applications
General DescriptionThe LM3658isa single chip chargerIC designedfor hand-
held applications.It can safely charge and maintaina single
cell Li-Ion/Polymer battery operating from an AC wall
adapteror USB power source. Input power source selection USB/ACis automatic. With both power sources present,
the AC power source has priority. Charge currentis pro-
grammed throughan external resistor when operating fromAC wall adapter allowing charge currents from50 mAto
1000 mA. When the batteryis charged using USB power,
chargecurrentsof 100mAor 500 mAare pin-selectable. The
termination voltageis controlledto within ±0.35%of 4.2V.
The LM3658 requires few external components and inte-
grates internal power FETs, reverse current protection and
current sensing. The internal power FETsare thermally regu-
latedto obtain the most efficient charging ratefora given
ambient temperature.
The LM3658 operatesin five modes: pre-qualification mode,
constant-current mode, constant-voltage mode, top-off
mode and maintenance mode. Optimal battery management obtained through thermal regulation, battery temperature
measurement and multiple safety timers. The LM3658 pro-
vides two open-drain outputsfor LED status indicationor
connectionto GPIOs.
Features Integrated power FETs with thermal regulation Charges from eitheranAC wall adapteror USB power
source with automatic source selection50 mAto 1000 mA charge currents usingAC wall
adapter Pin-selectable USB charge currentsof 100 mAor
500 mA Continuous battery temperature monitoring Built-in multiple safety timers Charge status indication Continuous over-current and temperature protection Near-depleted battery pre-conditioning Sleep mode with ultra low quiescent current On-board Kelvin-sensing achieves ±0.35% termination
accuracy Maintenance mode with automatic recharge Thermally enhanced3 mmx3mmLLP package
Applications Smartphones Digital still cameras PDAs Hard Drive and flash-based MP3 players USB-powered devices
Typical ApplicationMay 2005
LM3658
Dual
Source
USB/AC
Chemistry
Charger
for
Portable
Applications
