MB3879

* : The package is mounted on the dual-sided epoxy board (10 cm*10 cm) .

WARNING: Semiconductor devices can be permanently damaged by application of stress (voltage, current, temperature, etc.) in excess of absolute maximum ratings. Do not exceed these ratings.

The MB3879 is a DC/DC converter IC for parallel charging of 3/4 cell Li-ion & NiMH batteries, which uses the pulse-width modulation (PWM) for controlling output voltages and output currents independently.

This MB3879 can dynamically control secondary batterie's charge current, which detects voltage dropping in an AC adapter in order to keep its power constant (Dynamically controlled charging). This operation allows quick charging by variable charging current in accordance with operating status of a notebook PC.

Moreover, the total current of the MB3879 current and control IC input current are detected, and control of the secondary battery is enabled.

An efficient charge becomes possible because of the charge current comes in changeability according to the operation state of MB3879 by this operation.

The MB3879 also allows parallel charging that charges two batteries simultaneously, reducing charging time dramatically. The MB3879, using a built-in output voltage setting resistor, allows high-precision setting of output voltages. With its output-voltage switching function that is ready for both graphite-type and coke-type Li-ion batteries as well as NiMH battery, the IC is best suited to a built-in charger of a notebook PC.

This product is covered by US Patent Number 6,147,477.