DESCRIPTION
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 a 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

FEATURES
■ 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 Ensures
    Start-Up with Current Limited Wall Adapter
■ Small 24-Pin SSOP Package

APPLICATIONS
■ Digital Cameras
■ Handheld Computers
■ Personal Digital Assistants
■ 1W to 10W Uninterruptable Power Supplies