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SC820 Datasheet(PDF) 1 Page - Semtech Corporation |
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SC820 Datasheet(HTML) 1 Page - Semtech Corporation |
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1 / 21 page  © 2008 Semtech Corporation POWER MANAGEMENT 1 SC820 Adapter/USB Dual Input Single-cell Li-ion Charger Features Dual input charger automatically selects adapter input over USB Constant voltage — 4.2V, 1% regulation Fast-charge current regulation — 15% at 70mA, 9% at 700mA Three mode charging (current regulation, voltage regulation, thermal limiting) Input voltage protection — 30V Current-limited adapter charging support — reduces power dissipation in charger USB input limits charge current to prevent Vbus overload Instantaneous CC-to-CV transition for faster charging Programmable battery-dependent currents (adapter- sourced fast-charge & pre-charge, termination) Programmable source-limited currents (USB-sourced fast-charge & pre-charge) Three termination options — float-charge, automatic re-charge, or forced re-charge to keep the battery topped-off after termination without float-charging Soft-start reduces adapter or USB load transients High operating voltage range permits use of unregulated adapters Complies with CCSA YD/T 1591-2006 Space saving 2x2x0.6 (mm) MLPD package WEEE and RoHS compliant Applications Mobile phones MP3 players GPS handheld receivers Description The SC820 is a dual input (adapter/USB) linear single-cell Li-ion battery charger in an 8 lead 2x2 MLPD ultra-thin package. Both inputs will survive sustained input voltage up to 30V to protect against hot plug overshoot and faulty charging adapters. Charging begins automatically when a valid input source is applied to either input. The adapter input is selected when both input sources are present. Thermal limiting protects the SC820 from excessive power dissipation when charging from either source. The SC820 can be programmed to turn off when charging is complete or to continue operating as an LDO regulator while float- charging the battery. The adapter input charges with an adapter operating in voltage regulation or in current limit to obtain the lowest possible power dissipation by pulling the VAD input voltage down to the battery voltage. The VUSB input automatically limits load current to prevent over-loading the USB Vbus supply. Charge current programming requires two resistors. One determines battery-capacity dependent currents: adapter input fast-charge current, pre-charge current, and charge termination current. The other independently determines input-limited USB charging currents: USB input fast- charge and pre-charge current. Device Load Battery Pack 2.2 μF USB Vbus 2.2 μF VADAPTER 2.2 μF IPUSB IPRGM VUSB SC820 GND STATB ENB BAT VAD Typical Application Circuit February 26, 2008 |
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