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SC824 Datasheet(PDF) 1 Page - Semtech Corporation |
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SC824 Datasheet(HTML) 1 Page - Semtech Corporation |
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1 / 29 page  © 2009 Semtech Corporation POWER MANAGEMENT 1 SC824 Single-cell Li-Ion Charger Tri-Mode with Timer and NTC Features Single input 30V protected charger Adapter, USB High, USB Low modes Charging by current regulation, voltage regulation, and thermal limiting Programmable currents from 70mA to 1A Fast-charge current regulation — 15% at 70mA, 9% at 700mA Constant voltage — 4.2V, 1% regulation Input voltage protection — 30V Current-limited adapter support capability — reduces power dissipation in charger IC USB modes automatically reduce charge current if needed to prevent USB Vbus overload Instantaneous CC-to-CV transition for faster charging Battery temperature NTC thermistor interface Multi-stage charge timer for safety and alternative termination, IEEE Std. 1725-2006 compliant Termination on current or timer — first to occur Soft-start reduces adapter or USB load transients High operating voltage range permits use of unregulated adapters Complies with CCSA YD/T 1591-2006 High-current USB Dedicated Charger compatible Ultra-thin 2×2×0.6 (mm) MLPD package Lead-free and halogen-free WEEE and RoHS compliant Applications Mobile phones Personal Media Players Personal Navigation Devices Description The SC824 is a single input triple mode (adapter/USB High, USB Low) linear single-cell Li-Ion battery charger in a 10 lead 2×2 (mm) MLPD ultra-thin package. Charging begins automatically when an input source is applied to the charging input. The input is designed to survive sustained input voltage up to 30V to protect against hot plug overshoot and faulty charging adapters. Thermal limiting protects the SC824 from excessive power dissipation. The SC824 provides three modes of charging: adapter mode, USB low power mode, and USB high power mode. Adapter mode charges up to 1A with the charging adapter operating either in voltage regulation or in current limit to obtain the lowest possible power dissipation. A single current programming pin is used to program precharge current, termination current, and fast-charge current in fixed proportions. The USB modes provide low and high power fast-charge currents. The two USB modes dynami- cally limit the charging load if necessary to automatically prevent overloading the USB Vbus supply. The SC824 provides a battery NTC thermistor interface to disable charging when the battery temperature exceeds programmed thresholds. An optional programmable multi-stage charge timer protects against a faulty battery, or terminates charging on timeout if the system load is too great to terminate charging on current. A 45 minute top-off period following termination ensures a fully charged battery. The monitor state restarts a charge cycle if the battery discharges after the charger has turned off. Device Load Battery Pack 2.2μF VADAPTER 2.2μF RIPRGM VIN STAT0 IPRGM MODE GND VSYS EN_NTC BAT SC824 MODE SELECT CPU GPIO RTIME STAT1 1μF RNTC Thermistor RNPU Typical Application Circuit October 30, 2009 |
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