Integrated 850/500kHz battery chargers
Maxim Integrated Products has introduced two highly integrated SMBus battery chargers capable of operating at 850 and 500kHz respectively. The MAX17435/MAX17535 feature programmable settings such as charge current, charge voltage, input current limit, relearn voltage and digital IINP voltage readback. According to Maxim, the SMBus interface enables programming of the charge settings without changing external components to maximise design flexibility.
Able to provide ±0.4% battery voltage accuracy, the company claims the devices are ideal for notebook computers, ultra mobile pcs and mobile internet devices. Low offset current sense amplifiers are said to deliver ±3% charge current accuracy using 10m? sense resistors. An internal charge pump is designed to drive the adapter n channel mosfets when the adapter is present, and a p channel mosfet selects the battery in the absence of an adapter.
The MAX17435/MAX17535 are available in a 4 x 4mm, 24pin TQFN package with an exposed backside pad and are fully specified over the -40°C to 85°C extended temperature range.
