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 area. 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 which

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.

Features

• 0.5 Battery Voltage Accuracy

• 3 Adapter Current Limit Accuracy

• 3 Charge Current Accuracy

• SMBus 2-Wire Serial Interface

• Battery Short Circuit Protection

• Fast Response for Pulse-Charging

• Fast System-Load Transient Response

• Monitor Outputs

- Adapter Current (3 Accuracy)

- AC-Adapter Detection

• 11-Bit Battery Voltage Setting

• 6 Bit Charge Current/Adapter Current Setting

• 8A Maximum Battery Charger Current

• 11A Maximum Adapter Current

• +8V to +28V Adapter Voltage Range

• Pb-Free (RoHS Compliant)

Applications

• Notebook Computers

• Tablet PCs

• Portable Equipment with Rechargeable Batteries