New Industry Products

Mitsumi Electric Introduces Secondary Battery Charging Control IC

October 16, 2008 by Jeff Shepard

Mitsumi Electric Co Ltd. has introduced the MM3358, a Lithium-ion/Lithium polymer secondary battery charging control IC. This product has a internal power transistor and reverse current protection circuit, which are generally the external devices in conventional design and it is contained in a small PLP-10 package (2.7 x 2.5 x 0.6mm).

According to the company, since no external sensing resistor is required the charging circuit can be configured with the smaller number of parts than the conventional circuit. In addition, with the battery temperature detection function using the thermistor input the charging voltage and current can be controlled in response to temperature increase. With the chip temperature detection function the battery can be charged at the optimal charging rate while satisfying the IC temperature increase limit during charging with large power.

Among the device’s main features: they can reduce the number of parts and lower the heat dissipation without externally adding power transistor, reverse current protection circuit or sensing resistor; can control the charging voltage and current in proportion to the battery temperature that is detected by the battery temperature detection function using the thermistor input; can set up the recharging current, rapid charging current, and charge completion current (maximum charge current : 1.5A) with the use of external resistor; limits IC temperature increase during charging with the chip temperature detection function to allow battery charging at the optimal charging rate; and has an internal changing timer whose charging period of time can be set up at any value by adding the external resistor.