Single IC Provides Charging And Power Management

For maintaining single-cell Li-Ion and Li-Polymer batteries, the LM3658 integrates a dual-input USB/ac battery charger and power management functions on a single-chip. The device exhibits a termination accuracy of 1.5%, making it suitable for use in a variety of portable products. It also integrates power FETs, a current sensor, reverse-blocking protection, and thermal regulation. Advanced safety features include LED status indicators, timers, and continuous temperature monitoring of the battery. Programming is performed through an external resistor. The chip passes charge currents from 50 mA to 1A when operating from an ac adapter and 100 mA or 500 mA when charging via the USB. Other features include a termination voltage within 1.5% of 4.2V and an input voltage range of 2.5V to 6V. In a 10-lead LLP measuring 3 mm x 3 mm, price is $1.50 each/1,000. An evaluation board and lead-free package options are also available. NATIONAL SEMICONDUCTOR CORP., Santa Clara, CA. (800) 272-9959