DATASHEET ISL88731 FN9258 Rev 3.00 SMBus Level 2 Battery Charger June 8, 2011 The ISL88731 is a highly integrated Lithium-ion battery charger Features controller, programmable over the SMBus system management 0.5% Battery Voltage Accuracy bus (SMBus). The ISL88731 is intended to be used in a smart battery charger (SBC) within a smart battery system (SBS) that 3% Adapter Current Limit Accuracy throttles the charge power such that the current from the 3% Charge Current Accuracy AC-adapter is automatically limited. High efficiency is achieved SMBus 2-Wire Serial Interface with a DC/DC synchronous-rectifier buck converter, equipped with diode emulation for enhanced light load efficiency and Battery Short Circuit Protection system bus boosting prevention. The ISL88731 charges one to Fast Response for Pulse-Charging four Lithium-ion series cells, and delivers up to 8A charge current. Integrated MOSFET drivers and bootstrap diode result Fast System-Load Transient Response in fewer components and smaller implementation area. Low Monitor Outputs offset current-sense amplifiers provide high accuracy with - Adapter Current (3% Accuracy) 10m sense resistors. The ISL88731 provides 0.5% - AC-Adapter Detection end-of-charge battery voltage accuracy. 11-Bit Battery Voltage Setting The ISL88731 provides a digital output that indicates the presence of the AC adapter as well as an analog output which 6 Bit Charge Current/Adapter Current Setting indicates the adapter current within 4% accuracy. 8A Maximum Battery Charger Current The ISL88731 is available in a small 5mmx5mm 28 Ld Thin 11A Maximum Adapter Current (0.8mm) QFN package. An evaluation kit is available to reduce +8V to +28V Adapter Voltage Range design time. The ISL88731 is available in Pb-Free packages. Pb-Free (RoHS Compliant) Pin Configuration Applications ISL88731 (28 LD TQFN) Notebook Computers TOP VIEW Tablet PCs Portable Equipment with Rechargeable Batteries 28 27 26 25 24 23 22 Ordering Information NC 1 21 VDDP PART ACIN LGATE 2 20 NUMBER PART TEMP PACKAGE PKG. (Notes 1, 2, 3) MARKING RANGE (C) (Pb-Free) DWG. VREF 3 19 PGND ISL88731HRZ ISL887 31HRZ -10 to +100 28 Ld 5x5 TQFN L28.5x5B ICOMP 4 18 CSOP NOTES: NC 5 17 CSON 1. Add -T* suffix for tape and reel. Please refer to TB347 for details on reel specifications. VCOMP 6 16 NC 2. These Intersil Pb-free plastic packaged products employ special Pb-free NC VFB 7 15 material sets, molding compounds/die attach materials, and 100% matte tin plate plus anneal (e3 termination finish, which is RoHS 8 9 10 11 12 13 14 compliant and compatible with both SnPb and Pb-free soldering operations). Intersil Pb-free products are MSL classified at Pb-free peak reflow temperatures that meet or exceed the Pb-free requirements of IPC/JEDEC J STD-020. 3. For Moisture Sensitivity Level (MSL), please see device information page for ISL88731. For more information on MSL please see techbrief TB363. FN9258 Rev 3.00 Page 1 of 22 June 8, 2011 ICM CSSP SDA CSSN SCL VCC VDDSMB BOOT GND UGATE ACOK PHASE NC DCINISL88731 VCC DCIN LINEAR REFERENCE VDDP VREF 11 REGULATOR DACV VDDSMB DACV 6 DACS DACS SMBUS SDA REF ACOK + 6 DACI DACI SCL - EN ACIN BUFF ICM CSSP LEVEL - EN SHIFTER GMS DACS CSSN 20x + BOOT ICOMP CSO UGATE CSOP LEVEL - SHIFTER GMI PHASE DC-DC CSON 20x DACI + CONVERTER LVB VDDP LVB DACV + GMV LGATE - PGND VFB 500k 100k EN CSSP GND VCOMP FIGURE 1. FUNCTIONAL BLOCK DIAGRAM AC ADAPTER TO SYSTEM RS1 CSSP CSSN UGATE RS2 TO BATTERY ACIN PHASE DCIN ISL88731 BOOT LGATE CSOP AGND CSON VFB ICOMP VCOMP PGND VDDP PGND VREF ACOK ICM SDA SCL VCC VDDSMB GND AGND FIGURE 2. TYPICAL APPLICATION CIRCUIT FN9258 Rev 3.00 Page 2 of 22 June 8, 2011 HOST