MC33351A

The MC33351A is a type of monolithic lithium battery protection circuit, which is designed to enhance the useful oper ating life of three or four cell rechargeable battery packs. Cell protection features consist of a selectable charge inte rrupt, voltage sensing mode for precise cell voltage measurements, programmable overvoltage delay, choice of disch arge current limit sensing elements including either a lowside resistor or the highside MOSFET switches, progra mmable discharge current limit threshold and shutdown delay, selectable cell voltage balancing, and a virtually zero current sleepmode state while the cells are discharged. MC33351A needs a minimum number of external components and is targeted for inclusion within the battery pack.

Features of MC33351A are: (1)selectable charge interrupt voltage sensing mode for precise cell voltage measurem ents; (2)programmable overvoltage delay; (3)choice of discharge current limit sensing elements consisting of either low-side resistor or high-side mosfet switches; (4)programmable discharge current limit threshold and shutdown delay; (5)selectable cell voltage balancing; (6)virtually zero current sleepmode state when cells are discharged; (7)programmable for three or four cell applications; (8)minimum external components for inclusion within the battery pack; (9)available in standard and low profile surface mount package.

The absolute maximum ratings of the MC33351A can be summarized as:(1)input voltage(cell 1/Vc, pin15): 7.5V; (2)charge inhibit input: 7.5V; (3)discharge inhibit input: 7.5V; (4)overvoltage shutdown delay: 7.5V; (5)discharge curre nt limit shutdown delay: 20V; (6)low side discharge current limit input: 7.5V; (7)undervoltage fault output sink curre nt: 10mA; (8)operating junction temperature:-40 to 150; (9)storage temperature:-55 to 150.