Si9730
Vishay Siliconix
Dual-Cell Lithium Ion Battery Control IC
FEATURES
D D D D D D Over-Charge Protection Over-Disch...
Si9730
Vishay Siliconix
Dual-Cell Lithium Ion Battery Control IC
FEATURES
D D D D D D Over-Charge Protection Over-Discharge Protection Short Circuit Current Limiting Battery Open-Circuit Center Tap Protection Cell
Voltage Balancing Under
voltage Lockout D D D D D D Individual Cell
Voltage Monitoring Low Operating Current (30 mA) and Shutdown Current (1 mA) Internal N-Channel
MOSFET Driver High Noise Immunity Accurate ("1.19%) Over-Charge
Voltage Detection Four Different Cell Types Covered
DESCRIPTION
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 mA 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. The 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...