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UCT |
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RICOH |
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BELLING |
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APS |
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POWTECH |
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HITACHI |
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FAIRCHILD |
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IMP |
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uct3141/3142
the uct3141/uct3142 is a complete constant-current /constant voltage linear charger for single cell li-ion and li polymer rechargeable batteries. the device contains an on-chip power mosfet and eliminates the need for the external sense resistor and blocking diode. furthermore, the uct3141/uct3142 is specifically designed to work within usb power specifications. its low external component count makes uct3141/uct3142 ideally suited for portable applications.
thermal feedback regulates the charge current to limit the die temperature during high power operation or high ambient temperature. the regulation voltage is fixed at 4.1v(uct3141) or 4.2v(uct3142) with 1% accuracy. the charge current can be programmed externally with a single resistor. when the input supply (wall adapter or usb supply) is removed, the uct3141/uct3142 automatically enters a low power sleep mode , dropping the battery drain current to less than 3ua. other features include undervoltage lockout, automatic recharge, chip enable function, battery temperature sensing and a chrg pin to indicate charge status.
the uct3141/uct3142 is available in a thermally enhanced 8-pin sop package.
features:
-charges single cell li-ion batteries directly from usb port or ac adaptor
-on-chip power mosfet
-no external blocking diode or current sense resistors required
-preset 4.1v or 4.2v regulation voltage with 1% accuracy
-precharge conditioning for reviving deeply discharged cells and minimizing heat dissipation during initial stage of charge
-programmable charge current up to 500ma
-constant-current/constant-voltage operation with thermal regulation to maximize charge rate without risk of overheating
-automatic low-power sleep mode when input supply voltage is removed
-status indication for leds or up interface
-c/10 charge termination
-automatic recharge
-battery temperature sensing
-chip enable input
-available in sop8 package
applications:
-cellular telephones
-digital still cameras
-mp3 players
-bluetooth applications
-usb bus-powered chargers |
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