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SC803 Datasheet(PDF) 1 Page - Semtech Corporation |
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SC803 Datasheet(HTML) 1 Page - Semtech Corporation |
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1 / 17 page  1 www.semtech.com SC803 Fully Integrated High Current Lithium-Ion Battery Charger System POWER MANAGEMENT Revision 4, November 2004 Description Features Applications Typical Application Circuit Fully integrated charger with FET pass transistor, reverse-blocking diode, sense resistor and thermal protection Complete voltage ranges of 4.1V, 4.2V & adjustable Programmable precharge, fastcharge & termination current Battery voltage controlled to 1% accuracy Soft-start for step load and adaptor plug-in Up to 1.5A continuous charge current Charge current monitor output from microcontroller or ADC Interface Input voltages range from 4.2V to 7V 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 Low thermal impedance of 50° °° ° °C/watt Few external components Over current protection in all charging modes Over voltage protection with fault pin output All outputs able to drive LED’s and interface to host processor Remote Kelvin sensing at the battery terminal Small input & output filter capacitors Status output communicates charging and end of charge cycle Cellular phones PDA’s Handheld meters Charging stations Handheld computers Digital cameras Programmable current source The SC803 is a fully integrated, single cell, constant-cur- rent constant-voltage Lithium-Ion battery charger man- agement system. The SC803 has built in intelligence and extreme functionality. When the battery voltage is below 2.8V the charger operates in a pre-charge mode with a charging current of up to 125mA based on the ITERM pin resistor. This pre-charge mode is set to limit power dissipation due to an undercharged battery. When the battery voltage exceeds 2.8V, the charger enters a fast charge mode. In this mode, the SC803 delivers up to 1.5A to the battery based on the IPRGM pin resistor. The part also features current termination, ending the charge cycle when the battery is charged and the charge current drops below the current programmed by the ITERM pin resistor. In addition, the charge current can be monitored by the voltage on the IPRGM pin allowing a microcontroller or ADC to access the current informa- tion to determine when to externally terminate the charge cycle. Once the charge cycle is complete and terminates, the device enters the charge monitor mode where the output voltage of the battery is monitored. If this voltage drops below the recharge threshold the device will enter the fast charge mode again, to bring the battery to its fully charged state. Both the shutdown and monitor modes drain no more than 1uA from the battery guaran- teed. The output voltage to the battery is controlled to within 1% of the programmed voltage for either 4.1V or 4.2V. The SC803 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 external termination. 88 R2 1.5 Current n Terminatio • = 1000 R1 1.5 Current Charge Fast • = − 88 R2 2.8 Current Charge Pre • = − R1 CHARGER VIN SC803 14 1 3 7 4 15 9 10 2 11 5 8 13 6 16 12 VCC BSEN IPRGM EN ITERM VOUT OVP STAT VPRGM CP NC BIP VCC GND VOUT NC STATUS CHARGER FAULT R2 BATTERY C1 1uF C2 2.2uF PRESENT |
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