SMBus Level 2 Battery Charger

® ISL88731 Data Sheet November 20, 2006 FN9258.0 SMBus Level 2 Battery Charger 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 5mm x 5mm 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 Plus Anneal Available (RoHS Compliant) Applications • Notebook Computers • Tablet PCs Pinout ISL88731 (28 LD TQFN) TOP VIEW PHASE UGATE BOOT CSSN CSSP DCIN VCC • Portable Equipment with Rechargeable Batteries Ordering Information PART NUMBER 21 20 19 18 17 16 15 VDDP LGATE PGND CSOP CSON NC VFB 28 NC ACIN VREF ICOMP NC VCOMP NC 1 2 3 4 5 6 7 8 ICM 27 26 25 24 23 22 PART MARKING ISL887 31HRZ ISL887 31HRZ TEMP (°C) PACKAGE PKG. DWG. # ISL88731HRZ (Note) ISL88731HRZ-T (Note) -10 to +100 28 Ld 5x5 TQFN L28.5x5B (Pb-free) -10 to +100 28 Ld 5x5 TQFN L28.5x5B (Tape and Reel) (Pb-free) NOTE: Intersil Pb-free plus anneal products employ special Pb-free material sets; molding compounds/die attach materials and 100% matte tin plate termination finish, which are RoHS 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. 9 SDA 10 SCL 11 VDDSMB 12 GND 13 ACOK 14 NC 1 CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures. 1-888-INTERSIL or 1-888-468-3774 | Intersil (and design) is a registered trademark of Intersil Americas Inc. Copyright Intersil Americas Inc. 2006. All Rights Reserved All other trademarks mentioned are the property of their respective owners. ISL88731 DCIN VCC VDDSMB SDA SCL SMBus 11 6 6 DACV DACS DACI EN DACV DACS DACI Linear Regulator VDDP Reference VREF REF + - ACOK ACIN Buff ICM EN BOOT CSSP CSSN ICOMP Level Shifter 20x DACS GMS + CSO UGATE CSOP CSON Level Shifter 20x GMI DACI + LVB DACV DC-DC Converter PHASE VDDP LGATE PGND + GMV LVB VFB 500K 100K VCOMP EN CSSP GND FIGURE 1. FUNCTIONAL BLOCK DIAGRAM AC ADAPTER RS1 TO SYSTEM CSSP ACIN DCIN CSSN UGATE PHASE RS2 TO BATTERY ISL88731 BOOT LGATE AGND ICOMP VCOMP VDDP VREF CSOP CSON VFB PGND VCC GND ACOK ICM SDA SCL VDDSMB PGND HOST AGND FIGURE 2. TYPICAL APPLICATION CIRCUIT 2 FN9258.0 November 20, 2006 ISL88731 Absolute Maximum Ratings DCIN, CSSP, CSSN, CSOP, CSON, VFB . . . . . . . . . . -0.3V to +28V CSSP-CSSN, CSOP-CSON, PGND-GND. . . . . . . . . -0.3V to +0.3V PHASE to GND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -6V to +30V BOOT to GND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to +33V BOOT to PHASE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to +6V UGATE . . . . . . . . . . . . . . . . . . . . . . . . PHASE-0.3V to BOOT+0.3V LGATE . . . . . . . . . . . . . . . . . . . . . . . . . PGND-0.3V to VDDP+0.3V ICOMP, VCOMP, VREF, to GND . . . . . . . . . . . . -0.3V to VCC+0.3V VDDSMB, SCL, SDA, ACIN, ACOK . . . . . . . . . . . . . . . -0.3V to +6V VDDP, ICM, VCC to GND, VDDP to PGND. . . . . . . . . . -0.3V to +6V Thermal Information Thermal Resistance (Typical, Notes 1, 2) θJA (°C/W) θJC (°C/W) QFN Package. . . . . . . . . . . . . . . . . . . . 39 9.5 Junction Temperature Range. . . . . . . . . . . . . . . . . .-55°C to +150°C Operating Temperature Range . . . . . . . . . . . . . . . .-10°C to +100°C Storage Temperature . . . . . . . . . . . . . . . . . . . . . . . .-65°C to +150°C Lead Temperature (Soldering, 10s) . . . . . . . . . . . . . . . . . . . . +300°C CAUTION: Stress above those listed in “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress only rating and operation of the device at these or any other conditions above those indicated in the operational section of this specification is not implied. +150°C max junction temperature is intended for short periods of time to prevent shortening the lifetime. Operation close to +150°C junction may trigger the shutdown of the device even before +150°C, since this number is specified as typical. 1. θJA is measured with the component mounted on a highly effective thermal conductivity test board on free air. See Tech Brief TB379 for details. 2. For θJC, the “case temp” location is the center of the exposed metal pad on the package underside. Electrical Specifications PARAMETER DCIN = CSSP = CSSN = 18V, CSOP = CSON = 12V, VDDP = 5V, BOOT-PHASE = 5.0V, GND = PGND = 0V, CVDDP = 1µF, IVDDP = 0mA, TA = -10°C to +100°C CONDITIONS MIN TYP MAX UNITS CHARGE VOLTAGE REGULATION Battery Full Charge Voltage and Accuracy ChargeVoltage = 0x41A0 16.716 -0.5 ChargeVoltage = 0x3130 12.529 -0.5 ChargeVoltage = 0x20D0 8.350 -0.6 ChargeVoltage = 0x1060 4.163 -0.7 Battery Undervoltage Lockout Trip Point for Trickle Charge Battery Undervoltage Lockout Trip Point Hysteresis CHARGE CURRENT REGULATION CSOP to CSON Full-Scale Current-Sense Voltage Charge Current and Accuracy RS2 = 10mΩ (see Figure 2) ChargingCurrent = 0x1f80 RS2 = 10mΩ (see Figure 2) ChargingCurrent = 0x0f80 RS2 = 10mΩ (see Figure 2) ChargingCurrent = 0x0080 Charge Current Gain Error CSOP/CSON Input Voltage Range Based on charge current = 128mA and 8.064A 78.22 7.822 -3 3.809 -4 64 -1.6 0 128 3.968 80.64 8.064 83.06 8.306 3 4.126 4 220 1.4 19 mV A % A % mA % V VFB rising 2.55 100 2.7 250 4.192 8.4 12.592 16.8 16.884 0.5 12.655 0.5 8.450 0.6 4.221 0.7 2.85 400 V % V % V % V % V mV 3 FN9258.0 November 20, 2006 ISL88731 Electrical Specifications PARAMETER Battery Quiescent Current DCIN = CSSP = CSSN = 18V, CSOP = CSON = 12V, VDDP = 5V, BOOT-PHASE = 5.0V, GND = PGND = 0V, CVDDP = 1µF, IVDDP = 0mA, TA = -10°C to +100°C (Continued) CONDITIONS Adapter present, not charging, ICSOP + ICSON + IPHASE + ICSSP + ICSSN + IFB VPHASE = VCSON = VCSOP = VDCIN = 19V, VACIN = 5V Adapter Absent ICSOP + ICSON + IPHASE + ICSSP + ICSSN + IFB VPHASE = VCSON = VCSOP = 19V, VDCIN = 0V Adapter Quiescent Current INPUT CURRENT REGULATION CSSP to CSSN Full-Scale Current-Sense CSSP = 19V Voltage Input Current Accuracy RS1 = 10mΩ (see Figure 2) Adapter Current = 11004mA or 3584mA RS1 = 10mΩ (see Figure 2) Adapter Current = 2048mA Input Current Limit Gain Error Input Current Limit Offset CSSP/CSSN Input Voltage Range ICM Gain ICM Offset ICM Accuracy VCSSP-CSSN = 110mV Based on VCSSP-CSSN = 110mV and 20mV VCSSP-CSSN = 110mV VCSSP-CSSN = 55mV or 35mV VCSSP-CSSN = 20mV ICM Max Output Current SUPPLY AND LINEAR REGULATOR DCIN, Input Voltage Range VDDP Output Voltage VDDP Load Regulation VDDSMB Range VDDSMB UVLO Rising VDDSMB UVLO Hysteresis VDDSMB Quiescent Current V REFERENCE VREF Output Voltage ACOK ACOK Sink Current ACOK Leakage Current ACIN ACIN rising Threshold ACIN Threshold Hysteresis ACIN Input Bias Current SWITCHING REGULATOR Frequency 330 400 440 kHz 3.15 40 -1 3.2 60 3.25 90 1 V mV µA VACOK = 0.4V, ACIN = 1.5V VACOK = 5.5V, ACIN = 2.5V 2 8 1 mA µA 0 < IVREF < 300µA 3.168 3.2 3.232 V VDDP = SCL = SDA = 5.5V 8.0V < VDCIN < 28V, no load 0 < IVDDP < 30mA 2.7 2.4 100 2.5 150 20 8 5.0 5.1 35 26 5.23 100 5.5 2.6 200 27 V V mV V V mV µA VCSSP-CSSN = 0.1V Based on InputCurrent = 1024mA and 11004mA 106.7 -3 -5 -1.5 -1 8 19.8 -1.5 -2.5 -4 -8 20 110 113.3 3 5 1.5 1 26 20.2 1.5 2.5 4 8 500 mV % % % mV V V/V mV % % % µA IDCIN+ICSSP+ICSSN Vadapter = 8V to 26V, Vbattery 4V to 16.8V -1 MIN TYP 135 MAX 200 UNITS µA 0.2 2 µA 3 5 mA 4 FN9258.0 November 20, 2006 ISL88731 Electrical Specifications PARAMETER BOOT Supply Current PHASE Input Bias Current UGATE On-Resistance Low UGATE On-Resistance High LGATE On-Resistance High LGATE On-Resistance Low Dead Time ERROR AMPLIFIERS GMV Amplifier Transconductance GMI Amplifier Transconductance GMS Amplifier Transconductance GMI/GMS Saturation Current GMV Saturation Current ICOMP, VCOMP Clamp Voltage LOGIC LEVELS SDA/SCL Input Low Voltage SDA/SCL Input High Voltage SDA/SCL Input Bias Current SDA, Output Sink Current VDDSMB = 2.7V to 5.5V VDDSMB = 2.7V to 5.5V VDDSMB = 2.7V to 5.5V VSDA = 0.4V 2 -1 7 15 1 0.8 V V µA mA 0.25V < VICOMP, VCOMP < 3.5V 200 40 40 15 10 200 250 50 50 21 17 300 300 60 60 25 30 400 μA/V μA/V μA/V μA μA mV UGATE High VDCON = 28V, VCSON = VPHASE = 20V IUGATE = -100mA (see note 4) IUGATE = 10mA (see note 4) ILGATE = +10mA (see note 4) ILGATE = -100mA (see note 4) Falling UGATE to rising LGA