The ISL88731A is a highly integrated Lithium-ion battery

charger controller, programmable over the SMBus system

management bus (SMBus). The ISL88731A 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

ISL88731A 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

ISL88731A provides 0.5 end-of-charge battery voltage

accuracy.

The ISL88731A 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 ISL88731A is available in a small 5mmx5mm 28 Ld thin

(0.8mm) QFN package. An evaluation kit is available to reduce

design time. The ISL88731A 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