Summit Microelectronics’ SMB137 Li-ion battery charger expands its family of programmable battery-charger ICs, and is specifically designed for mobile consumer electronics. The device supports dual (USB, or external ac or dc) inputs and outputs (system or battery) with CurrentPath automatic arbitration. The controller intelligently applies the appropriate current limit (100 mA/500 mA, or 700 mA to 1400 mA), depending on the source.
The SMB137 can be custom programmed in manufacturing and used standalone without the need for system interaction. Alternatively, with the I2C interface, virtually all parameters can be adjusted on-the-fly to optimize battery charging with software, depending on system needs. The SMB137 is offered in a 3.3 mm x 3.6 mm 30-ball chip-scale (CSP) package, and is available now for $2.30 in quantities of 10,000 units.