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MAX1679 Datasheet(PDF) 5 Page - Maxim Integrated Products |
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MAX1679 Datasheet(HTML) 5 Page - Maxim Integrated Products |
5 / 12 page Single-Cell Li+ Battery Charger for Current-Limited Supply _______________________________________________________________________________________ 5 0.9900 1.0000 0.9950 1.0100 1.0050 1.0150 1.0200 -40 20 40 -20 0 60 80 100 TIMER PERIOD vs. AMBIENT TEMPERATURE TEMPERATURE (°C) NORMALIZED TO +25°C Typical Operating Characteristics (VIN = V CHG = +10V, VBATT = +4.2V, THERM = 10kΩ to GND, TA = +25°C, unless otherwise noted.) 4.0 4.8 4.4 4.6 4.2 5.2 5.0 5.8 5.6 5.4 6.0 515 10 20 25 PRECHARGE CURRENT vs. INPUT VOLTAGE VIN (V) VBATT = 4.1V VBATT = 2V VBATT = 0V 0.9975 0.9985 0.9980 0.9995 0.9990 1.0010 1.0005 1.0000 1.0015 -40 0 -20 20 40 60 80 100 NORMALIZED BATT REGULATION VOLTAGE vs. TEMPERATURE TEMPERATURE (°C) NORMALIZED TO +25°C Pin Description Battery Regulation Voltage Adjustment. Bypass to GND with a 1000pF capacitor. Connect a resistor from ADJ to GND to reduce the nominal +4.200V regulation setpoint. See Adjusting the Battery Regulation Voltage. ADJ 5 Ground. See Layout Guidelines for information on system grounding. Connect the battery’s negative termi- nal to GND. GND 6 Thermistor Temperature-Sensor Input. Connect a thermistor from THERM to GND to prequalify the cell tem- perature for fast-charge. Drive THERM high (> +1.4V) during Done or Fault states to reset the MAX1679 and reinitiate the charging sequence. Replace the thermistor with a 10k Ω resistor if temperature sensing is not required. THERM 7 Cell Voltage Monitor Input, Trickle-Charge Output, and MAX1679 Power Source. Connect BATT to the posi- tive terminal of a single Li+ cell. Bypass BATT with a capacitor to ground (1.5µF per amp of charge current). BATT 8 Maximum Total Charge-Time Selection. See Table 3 for timer options. TSEL 4 Charge Status Indication. CHG is an open-drain, current-limited N-channel MOSFET suitable for directly dri- ving an LED. Connect a pull-up resistor to BATT to generate a logic-level signal. See Table 2 for CHG out- put states. CHG 3 PIN Gate Drive for External PMOS Pass Element. The PMOS device should have a VGS threshold of 2.5V or less. See Selecting External Components. GATE 2 Input Voltage from Current-Limited Voltage Source (+22V max). Bypass to GND with a 0.1µF capacitor. The cell charging current is set by the current limit of the external power supply. IN 1 FUNCTION NAME |
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