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.

特性 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