LTC1980

Final Electrical Specifications LTC1980 www.DataSheet4U.com Combination Battery Charger and DC/DC Converter May 2003 FEATURES s s DESCRIPTIO s s s s s s s s s U APPLICATIO S s s s s Single Controller IC Includes Battery Charger Plus DC/DC Converter Wall Adapter Voltage May be Above or Below Battery Voltage LDO Controller Allows Simultaneous Charging and Regulating from Wall Adapter Input Standalone Li-Ion Battery Charger Including Charge Termination, Overvoltage Protection, Shorted-Cell Detection and Battery Recharge Selectable 4.1V, 4.2V, 8.2V and 8.4V Float Voltages Simple NiMH and NiCd Battery Charger Pin Programmable Regulator Burst Mode® Operation and Shutdown for High Efficiency High Efficiency Current Mode 300kHz PWM Reduced Component Architecture Undervoltage Protection and Soft-Start Insures Start-Up with Current Limited Wall Adapter Small 24-Pin SSOP Package The LTC®1980 integrates PWM power control for charging a battery and converting the battery voltage to a regulated output or simultaneously charging the battery while powering system load from an unregulated AC wall adapter. Combining these features into a single IC produces a smaller area and lower cost solution compared to presently available multi-IC solutions. The LTC1980 shares the discrete components for both the battery charger and the DC/DC converter thus minimizing size and cost relative to dual controller solutions. Both the battery charger and DC/DC converter use a current mode flyback top...