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SC804A Datasheet(PDF) 1 Page - Semtech Corporation |
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SC804A Datasheet(HTML) 1 Page - Semtech Corporation |
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1 / 21 page  1 www.semtech.com SC804A Fully Integrated 4.4V Lithium-Ion Battery Charger System with Timer PRELIMINARY POWER MANAGEMENT July 18, 2007 Typical Application Circuit Applications Description Features The SC804A is a fully integrated full-feature, single cell constant-current/constant-voltage (CC/CV) 4.4V Lithium- Ion battery charger. With an integrated timer and complete charge control algorithm, the SC804A is ideal for stand-alone charger applications. The SC804A contains programmable pre-charge, fast-charge and termination current settings. The SC804A can be programmed to terminate charging 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 it can also be adjusted by applying an analog voltage to the AFC pin. This feature allows use of a microcontroller to set charging current via a DAC output. The SC804A’s 14V input voltage range eliminates the need for additional protection circuitry required by other 5V chargers to protect against faulty adapters. The SC804A also incorporates an under-voltage lockout falling threshold of 3V so that charging will continue if the input supply goes into a current-limited mode. Reference ground and battery sense inputs are provided to eliminate voltage drops during charging due to high charging currents. The output voltage to the battery is controlled to within 1% of the programmed voltage. The SC804A can also function as a general purpose current source or as a current source for charging nickel-cadmium (NiCd) and nickel-metal-hydride (NiMH) batteries. Typical Application Circuit Fully integrated charger with FET pass transistor, reverse-blocking diode, sense resistor, timer, and thermal protection Battery voltage controlled to 1% accuracy Programmable precharge, fastcharge & termination current over wide range, with analog current control reference input for design flexibility Up to 1.5A continuous charge current Input voltage range from 3V to 14V Soft-start reduces start-of-charge adapter load transients NTC thermistor sense input and adjustable cold temperature threshold Adjustable 2 - 6 hour programmable charge timer 0.1μA battery drain current in shutdown and monitor modes Small 4mm x 4mm 16 lead MLPQ package Over-current protection in all modes Over-voltage protection Remote Kelvin sensing at the battery terminals Status indicators for charger-present, charger-active, over-voltage fault, and error notification Cellular phones PDAs Handheld meters Charging stations Handheld computers Digital cameras Programmable current source VCC 14 OVPB 13 3 IPRGM 7 NTC CPB CHRGB RTIM CTO 11 10 12 2 ITERM 4 FLTB 8 6 GND 5 RGND BSEN VOUT VOUT AFC 1 16 15 9 SC804A C1 2.2 μF R3 Battery Red Green Charger VIN RT NTC R1 R2 DAC ISET C2 2.2 μF R4 R5 R6 ERROR OV_FLT |
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