MAX1898 19-2295 Rev 0 1/02 Linear Charger for Single-Cell Li+ Battery General Description Features The MAX1898, with an external PNP or PMOS transistor, Simple, Safe Linear Charger forms a complete charger for 1-cell lithium-ion (Li+) bat- Uses Low-Cost PNP or PMOS Pass Element teries. The MAX1898 provides accurate constant-cur- rent/constant-voltage charging. Battery regulation voltage 4.5V to 12V Input Range accuracy is 0.75% for optimum battery performance Internal Current-Sense Resistor and cycle life. Charging current is user set, but is sensed internally so no external current-sense resistor is needed. 0.75% Voltage Accuracy The MAX1898 also provides outputs to monitor charge Programmable Charging Current status, presence-of-input power source, and charge cur- rent. Additional features include shutdown, optional Automatic Input Power-Source Detection charge-cycle restart without input-power cycling, selec- LED Charge Status Indicator table charge termination safety timer, and low-current preconditioning for deeply discharged cells. Programmable Safety Timer The MAX1898 offers the maximum integration and func- Current-Sense Monitor Output tionality in the smallest, most basic application circuit possible. Very few external components are required. Optional/Adjustable Auto-Restart The MAX1898 offers two versions to safely charge all Small MAX Package Li+ battery chemistries. The battery regulation voltage is 4.2V for the MAX1898EUB42 and 4.1V for the MAX1898EUB41. Both are available in a 10-pin ultra- thin MAX package. Ordering Information PART TEMP RANGE PIN-PACKAGE MAX1898EUB42 -40C to +85C 10 MAX MAX1898EUB41 -40C to +85C 10 MAX Applications Single-Cell Li+ Powered Portables Self-Charging Battery Packs Typical Operating Circuit PDAs Cell Phones INPUT 4.5V TO 12V Cradle Chargers OUTPUT IN CS LED Li+ BATTERY MAX1898 Pin Configuration CHG DRV ON TOP VIEW EN/OK BATT OFF IN 1 10 CS CT ISET CHG 2 9 DRV CT SETS MAX1898 CHARGE EN/OK 3 8 GND SETS CHARGE TIME CURRENT ISET 4 7 BATT RSTRT CT 5 6 RSTRT GND MAX 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.Linear Charger for Single-Cell Li+ Battery ABSOLUTE MAXIMUM RATINGS IN, DRV, CS, CHG to GND.....................................-0.3V to +14V Continuous Power Dissipation (T = +70C) A BATT, EN, ISET, RSTRT, CT to GND........................-0.3V to +6V 10-Pin MAX (derate 5.6mW/C above +70C) ..........444mW DRV to IN................................................................-14V to +0.3V Operating Temperature Range ...........................-40C to +85C IN to CS Current ....................................................................2A Junction Temperature......................................................+150C DRV Continuous Current ..................................................10mA Storage Temperature Range .............................-65C to +150C 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 = 8V, V = 4V, EN/OK = open, RSET = 2.8k , RSTRT = GND, T = 0C to +85C, unless otherwise noted. Typical values are IN BATT A at T = +25C.) A PARAMETER CONDITIONS MIN TYP MAX UNITS Supply Voltage Range 4.5 12 V Input OK Trip Point, IN Rising 45 70 100 mV (V - V ) IN BATT Input OK Trip Point, IN Falling 30 55 85 mV (V - V ) IN BATT V Input OK Trip Point, IN Rising 4.0 4.25 4.5 V IN V Input OK Trip Point, IN Falling 3.9 4.15 4.4 V IN EN/OK Sink Current (When Input V = 3.9V, V = 4V, IN BATT 100 A Power Not OK) V = 0.8V EN/OK EN/OK Source Current (When V = 2V 5 10 20 A EN/OK Input Power OK) EN/OK Logic Input High 4.5V V 12V 2 V IN EN/OK Logic Input Low 4.5V V 12V 0.6 V IN Done, RSTRT = GND, V = 4.1V for BATT 40 100 MAX1898EUB42 and 4.0V for MAX1898EUB41 Done, RSTRT = open, V = 4.1V for BATT 410 BATT Input Current A MAX1898EUB42 and 4.0V for MAX1898EUB41 EN/OK = GND 4 10 V = 4V 3 10 IN V = V = 4V (I + I ) 2 10 A IN BATT IN CS IN, CS Input Current V = 12V, (I + I ), done, RSTRT = open 2 5 mA IN IN CS VOLTAGE LOOP 4.168 4.232 MAX1898EUB42 4.2 Voltage-Loop Set Point V 4.069 4.131 MAX1898EUB41 4.1 Voltage-Loop Gain V / V 51 dB DRV BATT MAX1898EUB42 2.394 2.520 2.646 V Prequal Voltage Threshold Timers running V BATT MAX1898EUB41 2.337 2.460 2.583 DRV Sink Current V = V - 1V, V = 3.5V 4 mA DRV IN BATT DRV Output Resistance 470 2 MAX1898