MAX1508/MAX1508Y/MAX1508Z 19-2890 Rev 2 8/05 Linear Li+ Battery Charger with Integrated Pass FET, Thermal Regulation, and ACOK in 3mm x 3mm TDFN General Description Features The MAX1508 is an intelligent, stand-alone constant-cur- Stand-Alone Linear 1-Cell Li+ Battery Charger rent, constant-voltage (CCCV), thermally regulated linear No External FET, Reverse-Blocking Diode, or charger for a single-cell lithium-ion (Li+) battery. The Current-Sense Resistor Required MAX1508 integrates the current-sense circuit, MOS pass Programmable Fast-Charge Current (0.8A max) element, and thermal-regulation circuitry, and also elimi- nates the reverse-blocking Schottky diode, to create the Proprietary Die-Temperature Regulation Control simplest and smallest charging solution for hand-held (+100C) equipment. +4.25V to +13V Input Voltage Range with Input The MAX1508 functions as a stand-alone charger to con- Overvoltage Protection (OVP) Above +7V trol the charging sequence from the prequalification state Charge-Current Monitor for Fuel Gauging through fast-charge, top-off charge, and full-charge indi- Low Dropout Voltage130mV at 0.425A cation. The MAX1508Y and MAX1508Z eliminate the pre- qualification state to allow startup into a load without a Input Power-Source Detection Output (ACOK) battery. Soft-Start Limits Inrush Current Proprietary thermal-regulation circuitry limits the die No Prequalification State for the MAX1508Y and temperature to +100C when fast charging or while MAX1508Z exposed to high ambient temperatures, allowing maxi- Charge Status Output (CHG) for LED or mum charging current without damaging the IC. Microprocessor Interface The MAX1508 achieves high flexibility by providing an Small 3mm x 3mm 8-Pin Thin DFN Package, adjustable fast-charge current by an external resistor. 0.8mm High Other features include the charging status (CHG) of the battery, an active-low control input (EN) for the Active-Low Charge Enable (EN) (MAX1508 and MAX1508 and MAX1508Z (active-high control input for MAX1508Z) the MAX1508Y), and an active-low input power-source Active-High Charge Enable (EN) (MAX1508Y) detection output (ACOK). Ordering Information The MAX1508 accepts a +4.25V to +13V supply, but dis- ables charging when the input voltage exceeds +7V to TOP protect against unqualified or faulty AC adapters. The PART TEMP RANGE PIN-PACKAGE MARK MAX1508 operates over the extended temperature range (-40C to +85C) and is available in a compact MAX1508ETA-T -40C to +85C8 Thin DFN-EP* AHF 8-pin thermally enhanced 3mm x 3mm thin DFN pack- MAX1508ETA+T -40C to +85C8 Thin DFN-EP* AHF age with 0.8mm height. *EP = Exposed paddle. Applications +Denotes lead-free package. Cellular and Cordless Phones Ordering Information continued at end of data sheet. PDAs Pin Configuration Digital Cameras and MP3 Players USB Appliances TOP VIEW Charging Cradles and Docks Bluetooth Equipment 8 76 5 MAX1508 MAX1508Y Typical Operating Circuit appears at end of data sheet. MAX1508Z + 1 2 3 4 3mm x 3mm THIN DFN ( ) ARE FOR THE MAX1508Y ONLY Bluetooth is a trademark of Ericsson. 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. EVALUATION KIT AVAILABLE VL CHG IN BATT GND ACOK EN (EN) ISETLinear Li+ Battery Charger with Integrated Pass FET, Thermal Regulation, and ACOK in 3mm x 3mm TDFN ABSOLUTE MAXIMUM RATINGS Short-Circuit Duration.................................................Continuous IN, CHG to GND.....................................................-0.3V to +14V Operating Temperature Range ...........................-40C to +85C VL, BATT, ISET, EN, EN, ACOK to GND ..................-0.3V to +6V VL to IN...................................................................-14V to +0.3V Junction Temperature......................................................+150C Storage Temperature Range .............................-65C to +150C IN to BATT Continuous Current.............................................0.9A Continuous Power Dissipation (T = +70C) Lead Temperature (soldering, 10s) .................................+300C A 8-Pin TDFN (derate 24.4mW/C above +70C) .........1951mW 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 = 5V, V = 4.0V, ACOK = EN = CHG = unconnected (for the MAX1508 and MAX1508Z), EN = VL (for the MAX1508Y), R IN BATT ISET = 2.8k to GND, C = 0.47F, BATT bypassed to GND with 1F, T = -40C to +85C, unless otherwise noted. Typical values are at VL A T = +25C.) (Note 1) A PARAMETER CONDITIONS MIN TYP MAX UNITS Input Voltage Range 013V Input Operating Range 4.25 6.50 V V - V , V rising 20 40 60 IN BATT IN ACOK Trip Point, IN mV V - V , V falling 15 30 45 IN BATT IN V rising 6.5 7 7.5 IN Overvoltage Lockout Trip Point V V hysteresis 0.11 IN Charging (I - I)12 IN BATT Disabled, EN = VL (MAX1508/MAX1508Z), IN Input Current 0.8 1.5 mA EN = GND (MAX1508Y) OFF state (V = V = 4.0V) 0.065 IN BATT VL Output Voltage I = 100A 3.3 V VL VL Load Regulation I = 100A to 2mA -71 -200 mV VL VL Temperature Coefficient I = 100A -2 mV/C VL V rising 2.95 IN VL Undervoltage Lockout Trip Point V Hysteresis 0.17 V = 0 to 4V 3 10 IN BATT Input Current A EN = VL (MAX1508/MAX1508Z), EN = GND 410 (MAX1508Y) Maximum RMS Charge Current 0.8 A T = 0C to +85C 4.162 4.2 4.238 A Battery Regulation Voltage I = 0 V BATT T = -40C to +85C 4.150 4.2 4.250 A BATT Removal Detection Threshold V rising 4.4 4.67 4.9 V BATT 2 MAX1508/MAX1508Y/MAX1508Z