National Semiconductor announces two battery-charging products for portable electronics: a single-cell USB/AC charger and a charge control and protection circuit for embedded Lithium-Ion and Lithium-polymer batteries. Appropriate for cellular phones, PDAs and handheld instrumentation, these tiny devices require few external components and support up to 1.2 A of a full-rated current. The LP3947 charge management system and LM3655 battery protection IC offer battery over-voltage and over-current protection, battery pre-conditioning and one percent charger voltage accuracy. The LP3947 is a complete charge management system that safely charges and maintains a Li-Ion battery from either a USB power source or an AC adapter. For the USB power source or AC adapter, the charge current, battery regulation voltage and end-of-charge (EOC) point can be selected via an I2C compatible interface. The LP3947 is available in a tiny, thermally enhanced 16-pin LLP® package measuring 4 mm × 4 mm.
National Semiconductor Corporation
