SC820 Adapter/USB Dual Input Single-cell Li-ion Charger POWER MANAGEMENT Features Description Input voltage protection 30V The SC820 is a dual input (adapter/USB) linear single-cell Adapter input automatically selected over USB Li-ion battery charger in an 8 lead 22mm MLPD ultra-thin Constant voltage 4.2V, 1% regulation package. Both inputs will survive sustained input voltage Charging by current and voltage regulation (CC/CV) up to 30V to protect against hot plug overshoot and faulty Thermal limiting of charge current charging adapters. Programmable battery-dependent currents (adapter- Charging begins automatically when a valid input source sourced fast-charge & pre-charge, termination) is applied to either input. The adapter input is selected Programmable source-limited currents (USB-sourced when both input sources are present. fast-charge & pre-charge) Current-limited adapter support reduces power dis- Thermal limiting protects the SC820 from excessive power sipation in charger IC dissipation when charging from either source. The SC820 USB input limits charge current prevents Vbus can be programmed to turn off when charging is complete overload or to continue operating as an LDO regulator while fl oat- Instantaneous CC-to-CV transition for faster charging charging the battery. Three termination options fl oat-charge, automatic re-charge, or forced re-charge to keep the battery The adapter input charges with an adapter operating in topped-off after termination without fl oat-charging voltage regulation or in current limit to obtain the lowest Soft-start reduces load transients possible power dissipation by pulling the VAD input High operating voltage range permits use of voltage down to the battery voltage. The VUSB input unregulated adapters dynamically limits load current to automatically prevent Complies with CCSA YD/T 1591-2006 over-loading the USB Vbus supply. Space saving 220.6 (mm) MLPD package Pb free, Halogen free, and RoHS/WEEE compliant Charge current programming requires two resistors. One determines battery-capacity dependent currents: adapter Applications input fast-charge current, pre-charge current, and charge Mobile phones termination current. The other independently determines MP3 players input-limited USB charging currents: USB input fast- GPS handheld receivers charge and pre-charge current. Typical Application Circuit SC820 Battery Device V VAD ENB ADAPTER Pack Load USB Vbus VUSB BAT 2.2 F STATB IPRGM 2.2 F 2.2 F GND IPUSB 2009 Semtech Corporation September 17, 2009 1SC820 Pin Confi guration Ordering Information Device Package (1)(2) SC820ULTRT MLPD-UT-8 22 SC820EVB Evaluation Board VAD ENB 1 8 Notes: TOP VIEW (1) Available in tape and reel only. A reel contains 3,000 devices. (2) Pb free, halogen free, and RoHS/WEEE compliant. VUSB 2 7 BAT STATB 3 6 IPRGM T GND 5 IPUSB 4 MLPD-UT8 22, 8 LEAD = 68C/W JA Marking Information 820 yw yw = Date Code 2