Si9730

VM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . VDD 15 V to VDD +15 V
VDD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . VSS 0.3 V to VSS +12 V
VC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . VSS 0.3 V to VDD +0.3 V
IS  (VSS w VM) . . . . . . . . . . . . . . . . . . . . . . . . . .  . . . . .. .  . . VM 0.3 V to VDD +0.3 V
      (VM w VSS ) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . VSS 0.3 V to VDD +0.3 V
Maximum Operating Junction Temperature . . . . .. . . .  .  . . . . .. . . . . . . . . . . . . 125
Power Dissipation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  . . . . .. . . . . . . . . . 200 mW
Thermal Impedance (PQJA) . . . . . . . . . . . . . . . . . . . . . . . .  . . . . .. . . . . . . . . . 80/W
Storage Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55 to 150

The Si9730 monitors the charging and discharging of dual-cell lithium-ion battery packs (carbon or coke chemistry) ensuring that battery capacity is fully utilized while ensuring safe operation.  The Si9730 provides protection against
overcharge, over-discharge, and short circuit conditions which are hazardous to the battery and the environment.

Battery voltages of each individual cell are monitored at the center-tap connection by an internal A/D converter through the VC pin.  If one or both of the cells is determined to be overcharged, an internal cell balancing network "bleeds" off current at 15
A until both cells are charged to the same maximum level. Depending on the condition of each cell, the Si9730 will switch two external source-connected n-channel MOSFETs on or off to allow the cells to be charged or to provide current to the load.

he Si9730 is available in an 8-pin SOIC package with an operating temperature range of −25 to 85°C.  The Si9730 is
available in both standard and lead (Pb)-free packages.