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SC805IMLTRT Datasheet(PDF) 1 Page - Semtech Corporation |
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SC805IMLTRT Datasheet(HTML) 1 Page - Semtech Corporation |
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1 / 15 page  1 www.semtech.com SC805 Miniature Integrated High Current Lithium-Ion Battery Charger POWER MANAGEMENT C1 1uF BATTERY R7 1k SC805 1 7 9 4 5 10 2 8 3 6 VCC EN/NTC RTIME IPRGM ITERM CHRGB VCCIL NOBAT VOUT GND R4 3.01k t RT1 Thermistor D2 LED C1 2.2uF Charging Indicator D3 LED R5 3.01k R2 3.01k R1 3.01k SC805 typical Application Circuit D1 LED CHARGER VIN R3 3.01k Adapter Present Indicator Charge Complete Indicator R6 1k August 22, 2005 Description Features Applications Typical Application Circuit Fully integrated charger with FET pass transistor, reverse-blocking diode, sense resistor and thermal protection High Accuracy Charge Current* Tiny 3mm x 3mm 10 lead MLP package Programmable precharge, fastcharge & termination current Battery voltage controlled to 1% accuracy Built in timer for protection and complete charging NTC interface with battery detection Soft-start for step load and adaptor plug-in Up to 1A continuous charge current Input voltage range from 3V to 6V allows seamless charging from current limited adapter Provides adapter voltage VCCIL to power external accessories Battery Present detection and output indicator Operates in charger or LDO-mode without battery 0.1µA battery drain current in shutdown and monitor modes Over current protection in all charging modes CHRGB output communicates charging and end of charge cycle *Patent Pending The SC805 is a fully integrated, single cell, constant-cur- rent (CC)/constant-voltage (CV) Lithium-Ion battery charger in a tiny 3x3 mm thermally enhanced lead free MLP package. The SC805 can operate as a stand-alone charger or in conjunction with a Power Management Con- troller (PMIC). The SC805 has a pre-charge function for trickle charging deeply discharged batteries. The fast charge current is enabled automatically when the battery voltage reaches the required threshold. When the battery reaches the constant voltage or CV portion of the charge curve the SC805 switches to CV regulation mode. In this mode the output current decays as the battery charges until the termination current is reached and the SC805 sig- nals the charge cycle is complete. The SC805 can be configured to continue charging for a predetermined time before turning off, or to turn off immediately upon termi- nation. After turning off its output, The SC805 enters monitor mode. If the battery voltage drops by 100mV from the CV voltage a new charge cycle will begin. The timer function also protects against charging faulty bat- teries by turning off if the pre-charge time exceeds 1/4 of the total programmed charge duration. The SC805 also provides battery detection, and a bat- tery NTC thermistor interface to disable charging when the battery temperature exceeds safe-to-charge limits. The SC805 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. Cellular phones PDA’s Handheld meters Charging stations USB chargers Digital cameras Programmable current source |
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