LTC1980 Datasheet | Linear Technology

Final Electrical Specifications .. bination 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 Ni MH and Ni Cd Battery Charger Pin Programmable Regulator Burst Mode® Operation and Shutdown for High Efficiency High Efficiency Current Mode 300k Hz PWM Reduced ponent 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. bining these Features into a single IC produces a smaller area and lower cost solution pared to presently available multi-IC solutions. The LTC1980 shares the discrete ponents 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 topology for high efficiency and excellent transient response. Optional Burst Mode operation and power-down mode allow power density, efficiency and output ripple to be tailored to the application. The LTC1980 provides a plete Li-Ion battery charger with charge termination timer, preset Li-Ion battery voltages, overvoltage and undervoltage protection, and userprogrammable constant-current charging. Automatic battery recharging, shorted-cell detection, and open-drain C/10 and wall plug detect...