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SC802EVB Datasheet(PDF) 1 Page - Semtech Corporation |
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SC802EVB Datasheet(HTML) 1 Page - Semtech Corporation |
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1 / 16 page  1 www.semtech.com SC802/SC802A Fully Integrated Lithium-Ion Battery Charger System with Timer POWER MANAGEMENT June 13, 2005 Features Applications Typical Application Circuit Fully integrated charger with FET pass transistor, reverse-blocking diode, sense resistor, timer, and thermal protection Complete voltage ranges of 4.1V, 4.2V & adjust- able Programmable precharge, fastcharge & termina- tion current Battery voltage controlled to 1% accuracy Soft-start for glitch-free adaptor plug-in Up to 1A continuous charge current Charge current monitor output for microcontroller or ADC interface Input voltage range from 4.3V to 14V 0.1μA battery drain current in shutdown and monitor modes Operates without a battery in regulated LDO mode Small 4mm x 4mm 16 lead MLP package NTC thermistor sense input Adjustable 6 Hour programmable charge timer Over current protection in all charging modes Over voltage protection Remote Kelvin sensing at the battery terminals ADC input control capable Status output communicates charging and end of charge cycle Charges Li-Ion, Li-Polymer, NiCd and NiMH Batteries Cellular phones PDA’s Handheld meters Charging stations Handheld computers Digital cameras Programmable current source The SC802 is a fully integrated, single cell, constant-cur- rent/constant-voltage Lithium-Ion\Lithium Polymer bat- tery charger. With an integrated timer and complete charge control algorithm, the SC802 is well suited for stand-alone charger applications. The SC802 contains programmable pre-charge, fast-charge, and termination current settings. The SC802 can be programmed to ter- minate charge based on the output current or the time- out of the programmable timer. The fast charge current is typically set with an external resistor but can be modi- fied with the analog fast charge input to allow a Power Management Controller to control the fastcharge current setting via DAC. The 14V input voltage range of the SC802 eliminates additional protection circuitry required by other 5V charg- ers in the event of faulty adapters. Reference ground and battery sense inputs are provided to allow Kelvin connections to eliminate IR voltage drops during charging. The output voltage to the battery is controlled to within 1% of the programmed voltage for either 4.1V or 4.2V. The SC802 can also function as a general purpose cur- rent source or as a current source for charging nickel- cadmium (NiCd) and nickel-metal-hydride (NiMH) batter- ies using NTC termination. The SC802A version of the device is optimized for high termination current applications. All descriptions and text refering to the SC802 also apply to the SC802A unless otherwise noted. Description CHARGER VIN t RT1 THERMISTOR CHARGER ADC Iset R6 1K PRESENT R5 1K R3 R R4 C1 1uF R1 SC802 14 1 3 7 4 15 12 10 2 11 5 8 13 6 16 9 VCC BSEN IPRGM EN/NTC ITERM VOUT RTIM CHRGB VPRGM CPB RFGND BIPB VCC GND VOUT AFC CHARGE C2 2.2uF R2 BATTERY |
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