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SC805A Datasheet(PDF) 1 Page - Semtech Corporation |
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SC805A Datasheet(HTML) 1 Page - Semtech Corporation |
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1 / 17 page  POWER MANAGEMENT 1 www.semtech.com Miniature Integrated High Current Lithium-Ion Battery Charger SC805A POWER MANAGEMENT Description Style Name _GreenBarText Features Applications 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 MLPD package Programmable pre-charge, fast-charge and termination current Battery voltage controlled to 1% accuracy Built-in timer for protection and complete charging NTC interface with battery detection Soft-start to reduce adapter in-rush current 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 *US Patent 6,836,095 The SC805A is a fully integrated, single cell, constant- current (CC)/constant-voltage (CV) Lithium-Ion battery charger in a tiny 3x3 mm thermally enhanced lead-free MLP package. The SC805A can operate as a stand-alone charger or in conjunction with a Power Management Inte- grated Circuit (PMIC). The SC805A 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 SC805A switches to CV regulation mode. In this mode the output current decays as the battery charges until the termination current is reached and the SC805A signals the charge cycle is complete. The SC805A can be configured to continue charging for a pre-determined time before turning off, or to turn off immediately upon termination. After turning off its output, the SC805A 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 batteries by turning off if the pre-charge time exceeds ¼ of the total programmed charge duration. The SC805A also provides battery detection, and a battery NTC thermistor interface to disable charging when the battery temperature exceeds safe-to-charge limits. The SC805A 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. C1 1μF BATTERY R7 1k SC805A 1 7 9 4 5 10 2 8 3 6 VCC EN/NTC RTIME IPRGM ITERM CHRGB VCCIL NOBAT VOUT GND R4 3.01k RT1 Thermistor D2 LED C1 2.2μF Charging Indicator D3 LED R5 3.01k R2 3.01k R1 3.01k SC805A Typical Application Circuit D1 LED CHARGER VIN R3 39.2k Adapter Present Indicator Charge Complete Indicator R6 1k Features Applications Typical Application Circuit Description Cellular Phones PDAs Handheld Meters Charging Stations USB Chargers Digital Cameras Programmable Current Source June 17, 2008 |
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