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MAX1737 Datasheet(PDF) 1 Page - Maxim Integrated Products |
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MAX1737 Datasheet(HTML) 1 Page - Maxim Integrated Products |
1 / 18 page General Description The MAX1737 is a switch-mode lithium-ion (Li+) battery charger that charges one to four cells. It provides a regulated charging current and a regulated voltage with only a ±0.8% total voltage error at the battery ter- minals. The external N-channel switch and synchronous rectifier provide high efficiency over a wide input volt- age range. A built-in safety timer automatically termi- nates charging once the adjustable time limit has been reached. The MAX1737 regulates the voltage set point and charg- ing current using two loops that work together to transi- tion smoothly between voltage and current regulation. An additional control loop monitors the total current drawn from the input source to prevent overload of the input supply, allowing the use of a low-cost wall adapter. The per-cell battery voltage regulation limit is set between +4.0V and +4.4V and can be set from one to four by pin strapping. Battery temperature is monitored by an external thermistor to prevent charging if the bat- tery temperature is outside the acceptable range. The MAX1737 is available in a space-saving 28-pin QSOP package. Use the evaluation kit (MAX1737EVKIT) to help reduce design time. Applications Features o Stand-Alone Charger for Up to Four Li+ Cells o ±0.8% Accurate Battery Regulation Voltage o Low Dropout: 98% Duty Cycle o Safely Precharges Near-Dead Cells o Continuous Voltage and Temperature Monitoring o <1µA Shutdown Battery Current o Input Voltage Up to +28V o Safety Timer Prevents Overcharging o Input Current Limiting o Space-Saving 28-Pin QSOP o 300kHz PWM Oscillator Reduces Noise o 90% Conversion Efficiency Stand-Alone Switch-Mode Lithium-Ion Battery-Charger Controller ________________________________________________________________ Maxim Integrated Products 1 GND DCIN CSSP CSSN LX BST VLO DLO PGND CS THM BATT FASTCHG FULLCHG FAULT SHDN ON OFF TIMER2 TIMER1 Li+ BATTERY 1 TO 4 CELLS RS CCI CCV CCS VADJ ISETIN VL REF ISETOUT INPUT SUPPLY CELL DHI SYSTEM LOAD MAX1737 19-1626; Rev 1; 7/00 PART MAX1737EEI -40°C to +85°C TEMP. RANGE PIN-PACKAGE 28 QSOP EVALUATION KIT AVAILABLE Typical Operating Circuit 28 27 26 25 24 23 22 21 20 19 18 17 16 15 1 2 3 4 5 6 7 8 9 10 11 12 13 14 DCIN CSSP CSSN DHI LX BST FAULT VLO DLO PGND CS SHDN FULLCHG FASTCHG TIMER2 TIMER1 CELL CCI CCS CCV VADJ BATT GND REF THM ISETOUT ISETIN VL QSOP TOP VIEW MAX1737 Pin Configuration Ordering Information Notebook Computers Hand-Held Instruments Li+ Battery Packs Desktop Cradle Chargers For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com. |
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