2x Intersil ISL88731C HRTZ Battery Charger IC Chip
https://restoreredspruce.org/2024/05/13/y0nsiy7rzfq £4.49
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go to link SMBus Level 2 Battery Charger
  The ISL88731C is a highly integrated Lithium-ion battery charger controller, programmable over the SMBus system management bus (SMBus). The IS L88731C is intended to be used in a smart battery charger (SBC) within a smart battery system (SBS) that throttles the charge power such that the current from the AC-adapter is automatically limited. High efficiency is achieved with a DC/DC synchronous-rectifier buck converter, equipped with diode emulation for enhanced light load efficiency and system bus boosting prevention. The ISL88731C charges one to four Lithium-ion series cells, and delivers up to 8A charge current. Integrated MOSFET drivers and bootstrap diode result in fewer components and smaller implementation area. Low offset current-sense amplifiers provide high accuracy with 10m Ω  sense resistors. The ISL88731C provides 0.5% end-of-charge battery voltage accuracy. The ISL88731C provides a digita l output that indicates the presence of the AC adapter as we ll as an analog output which indicates the adapter current within 4% accuracy.
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