MAX1667 19-1488 Rev 1 5/03 Chemistry-Independent, Level 2 Smart Battery Charger General Description Features The MAX1667 provides the power control necessary to Charges Any Battery Chemistry: Li+, NiCd, charge batteries of any chemistry. All charging functions NiMH, Lead Acid, etc. are controlled through the Intel System Management Bus SMBus 2-Wire Serial Interface (SMBus) interface. The SMBus 2-wire serial interface sets the charge voltage and current and provides thermal Compliant with Duracell/Intel Smart Battery status information. The MAX1667 functions as a Level 2 Charger Specification Rev. 1.0 charger, compliant with the Duracell/Intel Smart Battery 4A, 3A, or 1A (max) Battery Charge Current Charger Specification. In addition to the feature set required for a Level 2 charg- 5-Bit Control of Charge Current er, the MAX1667 generates interrupts to signal the host Up to 18.4V Battery Voltage when power is applied to the charger or when a battery is installed or removed. Additional status bits allow the host 11-Bit Control of Voltage to check whether the charger has enough input voltage, 1% Voltage Accuracy and whether the voltage on or current into the battery is being regulated. This allows the host to determine when Up to +28V Input Voltage lithium-ion (Li+) batteries have completed the charge with- Battery Thermistor Fail-Safe Protection out interrogating the battery. Greater than 95% Efficiency The MAX1667 is available in a 20-pin SSOP with a 2mm profile height. Synchronous Rectifier Applications Ordering Information Notebook Computers Charger Base Stations PART TEMP RANGE PIN-PACKAGE Personal Digital Assistants Phones MAX1667EAP -40C to +85C 20 SSOP Pin Configuration appears at end of data sheet. Typical Operating Circuit SMBus is a trademark of Intel Corp. Maxim Integrated Products 1 For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct at 1-888-629-4642, or visit Maxims website at www.maxim-ic.com. V R CHARGE SOURCE IOUT DCIN VL REF BST DHI AGND LX DD DLO SEL HOST CONTROLLER DACV PGND SCL SDA INT INT CCV CS GND SENSE MAX1667 BATT BATT+ SCL SCL SMART SDA SDA BATTERY CCI THM TEMP BATT-Chemistry-Independent, Level 2 Smart Battery Charger ABSOLUTE MAXIMUM RATINGS DCIN to AGND .......................................................-0.3V to +30V PGND to AGND.....................................................-0.3V to +0.3V BST to AGND..........................................................-0.3V to +36V SDA, INT Current ................................................................50mA BST, DHI to LX..........................................................-0.3V to +6V VL Current...........................................................................50mA LX, IOUT to AGND..................................................-0.3V to +30V Continuous Power Dissipation (T = +70C) A THM, CCI, CCV, DACV, REF, SSOP (derate 8mW/C above +70C) ..........................640mW DLO to AGND.............................................-0.3V to (VL + 0.3V) Operating Temperature Range ...........................-40C to +85C VL, SEL, INT, SDA, SCL to AGND............................-0.3V to +6V Storage Temperature Range .............................-60C to +150C BATT, CS+ to AGND ..............................................-0.3V to +20V Lead Temperature (soldering, 10s) .................................+300C Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. ELECTRICAL CHARACTERISTICS (V = 18V, internal reference, 1F capacitor at REF, 1F capacitor at VL, T = 0C to +85C, unless otherwise noted. Typical values DCIN A are at T = +25C, unless otherwise noted.) A PARAMETER CONDITIONS MIN TYP MAX UNITS SUPPLY AND REFERENCE DCIN Input Voltage Range 7.5 28 V DCIN Quiescent Current 7.5V < V < 28V, logic inputs = VL 46 mA DCIN VL Output Voltage 7.5V < V < 28V, no load 5.15 5.4 5.65 V DCIN VL Load Regulation I = 0 to 10mA 100 mV LOAD VL AC PRESENT Trip Point 3.20 4 5.15 V REF Output Voltage 0 < I < 500A 4.055 4.096 4.137 V SOURCE SWITCHING REGULATOR Oscillator Frequency Not in dropout 200 250 300 kHz DHI Maximum Duty Cycle In dropout 96.5 97.7 % DHI On-Resistance High or low 47 DLO On-Resistance High or low 58 VL < 3.2V, V = 12V 15 BATT BATT Input Current (Note 1) A VL > 5.15V, V = 12V 350 500 BATT VL < 3.2V, V = 12V 15 CS CS Input Current (Note 1) A VL > 5.15V, V = 12V 170 400 CS BATT, CS Input Voltage Range 019 V CS to BATT Single-Count ChargingCurrent() = 0x0080 (128mA) 5 mV Current-Sense Voltage CS to BATT Full-Scale SEL = VL (4A), 145 160 175 mV Current-Sense Voltage ChargingCurrent() = 0x0F80 (3968mA) ChargingVoltage() -0.8 0.8 TA = +25C = 0x3130 (12,592mV) and T = T to T -1.0 1.0 A MIN MAX 0x41A0 (16,800mV) Voltage Accuracy % ChargingVoltage() T = +25C -1.0 1.0 A = 0x1060 (4192mV) and T = T to T -3.0 3.0 A MIN MAX 0x20D0 (8400mV) 2 MAX1667