Description
The ISL88731 is a highly integrated Lithium-ion battery charger controller, programmable over the SMBus system management bus (SMBus). The ISL88731 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 ISL88731 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 areas. Low offset current-sense amplifiers provide high accuracy with 10mΩ sense resistors. The ISL88731 provides 0. 5% end-of-charge battery voltage accuracy. The ISL88731 provides a digital output that indicates the presence of the AC adapter as well as an analog output that indicates the adapter current within 4% accuracy. The ISL88731 is available in a small 5mmx5mm 28 Ld Thin (0. 8mm) QFN package. An evaluation kit is available to reduce design time. The ISL88731 is available in Pb-Free packages.
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nFeatures
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- 0.5% Battery Voltage Accuracy
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- 3% Adapter Current Limit Accuracy
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- 3% Charge Current Accuracy
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- SMBus 2-Wire Serial Interface
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- Battery Short Circuit Protection
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- Fast Response for Pulse-Charging
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- Fast System-Load Transient Response
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- Monitor Outputs
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- Adapter Current (3% Accuracy)
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- AC-Adapter Detection
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- 11-Bit Battery Voltage Setting
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- 6 Bit Charge Current/Adapter Current Setting
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- 8A Maximum Battery Charger Current
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- +8V to +28V Adapter Voltage Range
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- Pb-Free (RoHS Compliant)
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nApplications
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- Notebook Computers
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- Tablet PCs
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- Portable Equipment with Rechargeable Batteries
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