MAX17435/MAX17535 19-4817 Rev 1 9/10 High-Frequency, Low-Cost SMBus Chargers General Description Features S Low-Cost SMBus Charger The MAX17435/MAX17535 integrated multichemistry battery-charger ICs simplify construction of accurate S High Switching Frequency (0.85MHz/0.5MHz) and efficient chargers. The MAX17435/MAX17535 S Internal Boost Switches provide SMBusK-programmable charge current, charge S SMBus-Programmable Charge Voltage, Input voltage, input current limit, relearn voltage, and digital Current Limit, Charge Current, Relearn Voltage, readback of the IINP voltage. The MAX17435/MAX17535 and Digital IINP Readback utilize a charge pump to control the adapter selection S Single-Point Compensation n-channel MOSFETs when the adapter is present. When S Automatic Selection of System Power Source the adapter is absent, the charge pump is shut down and Adapter n-Channel MOSFETs Driven by an a p-channel MOSFET selects the battery. Internal Dedicated Charge Pump The MAX17435/MAX17535 provide up to 7A of charge Adapter Soft-Start current to 2, 3, or 4 lithium-ion (Li+) cells in series. The S 0.4% Accurate Charge Voltage charge current, and input current-limit sense amplifiers have S 2.5% Accurate Input Current Limiting low offset errors and can use 10mI sense resistors. The S 3% Accurate Charge Current MAX17435/MAX17535 fixed-inductor ripple architecture significantly reduces component size and circuit cost. S Monitor Outputs for AC Adapter Current (2% Accuracy) The MAX17435/MAX17535 provide a digital output that Battery Discharge Current (2% Accuracy) indicates the presence of the adapter, an analog output AC Adapter Presence that indicates the adapter or battery current, depending S AC Adapter Overvoltage Protection upon the presence or absence of the adapter, and a digital output that indicates when the adapter current S 11-Bit Battery Voltage Setting exceeds a user-defined threshold. S 6-Bit, Charge-Current Setting/Input Current Setting The MAX17435 switches at an 850kHz frequency and the S Improved IINP Accuracy at Low Input Current MAX17535 switches at 500kHz. The MAX17435/MAX17535 are available in a small, 4mm Ordering Information x 4mm x 0.75mm, 24-pin, lead-free TQFN package. An evaluation kit is available. PART TEMP RANGE PIN-PACKAGE N N MAX17435ETG+ -40 C to +85 C 24 TQFN-EP* Applications N N MAX17535ETG+ -40 C to +85 C 24 TQFN-EP* Notebook Computers +Denotes a lead(Pb)-free/RoHS-compliant package. *EP = Exposed pad. PDAs and Mobile Communicators 2- to 4- Li+ Cell Battery-Powered Devices Pin Configuration TOP VIEW 18 17 16 15 14 13 ACIN 19 12 CSIP ITHR 20 11 CSIN V 21 10 ACOK AA MAX17435 V DHI CC 22 9 MAX17535 GND LX 23 8 BST EN 24 7 1 2 3 4 5 6 SMBus is a trademark of Intel Corp. Maxim Integrated Products 1 For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxims website at www.maxim-ic.com. EVALUATION KIT AVAILABLE SCL IINP SDA CC DCIN CSSP LDO CSSN DLO PDSL ADAPTLIM BATTHigh-Frequency, Low-Cost SMBus Chargers ABSOLUTE MAXIMUM RATINGS DCIN, CSSP, BATT, CSIP to GND .........................-0.3V to +28V CC, IINP to GND ......................................-0.3V to (V + 0.3V) LDO CSIP to CSIN, CSSP to CSSN ..............................-0.3V to +0.3V LDO Short Circuit to GND .........................................Momentary V , SCL, SDA, V , EN, ACIN, ITHR, Continuous Power Dissipation (T = +70NC) CC AA A ADAPTLIM, ACOK to GND ..................................-0.3V to +6V 24-Pin TQFN (derate 20.8mW/NC above +70NC) .......1666mW PDSL to GND .........................................................-0.3V to +37V Operating Temperature Range .......................... -40NC to +85NC GND to PGND ......................................................-0.3V to +0.3V Junction Temperature .....................................................+150NC Storage Temperature Range ............................ -65NC to +150NC DHI to LX................................................-0.3V to (V + 0.3V) BST Lead Temperature (soldering, 10s) .................................+300NC BST to LX .................................................................-0.3V to +6V Soldering Temperature ....................................................+260NC BST to GND ...........................................................-0.3V to +34V DLO to PGND ..........................................-0.3V to (V + 0.3V) LDO LX to GND ................................................................-6V to +28V 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 (Circuit of Figure 1, no load on LDO, V = V = V = 19V, V = 0V, V - V = 5V, V = V = V = 16.8V, DCIN CSSP CSSN LX BST LX BATT CSIP CSIN T = 0 C to +85 C, unless otherwise noted. Typical values are at T = +25 C.) A A PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS INPUT SUPPLIES Charging enabled, Adapter Present Quiescent I + I + V = 19V, 3 6 mA DCIN CSSP ADAPTER Current (Note 1) I V = 16.8V CSSN BATTERY Charging disabled 1.5 2.2 mA Adapter absent or charger BATT + CSIP + CSIN + V = 16.8V 2.0 BATT shut down (Note 1) FA LX Input Current V = 2V to 19V, adapter present (Note 1) 200 650 BATT DCIN Input Current I Charger disabled 0.7 1.0 mA DCIN V Supply Current I Charger added 1.5 2.5 mA CC CC DCIN Input Voltage Range 8 26 V for Charger V falling 7 7.2 DCIN Undervoltage-Lockout DCIN V Trip Point for Charger V rising 7.7 7.9 DCIN DCIN Input Voltage Range 8 26 V CHARGE-VOLTAGE REGULATION 16.733 16.8 16.867 V ChargingVoltage() = 0x41A0 -0.4 +0.4 % 12.516 12.592 12.668 V ChargingVoltage() = 0x3130 -0.6 +0.6 % Battery Full-Charge Voltage and Accuracy 8.333 8.4 8.467 V ChargingVoltage() = 0x20D0 -0.8 +0.8 % 4.15 4.192 4.234 V ChargingVoltage() = 0x1060 -1.0 +1.0 % Battery Undervoltage-Lockout 3 3.5 4 V Trip Point for Trickle Charge 2 MAX17435/MAX17535