LTC1980

The LTC^®1980 integrates PWM power control for charg-ing 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 pro- duces 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 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 complete Li-Ion battery charger with charge termination timer, preset Li-Ion battery volt- ages, overvoltage and undervoltage protection, and user- programmable constant-current charging. Automatic bat- tery recharging, shorted-cell detection, and open-drain C /10 and wall plug detect outputs are also provided. User programming allows NiMH and NiCd battery chemistries to be charged as well.