ISL88731A
SMBus Level 2 Battery Charger
Key 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)
Description
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.
Applications
- Notebook Computers
- Tablet PCs
- Portable Equipment with Rechargeable Batteries
