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MAX8845YETC+ Datasheet(PDF) 7 Page - Maxim Integrated Products |
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MAX8845YETC+ Datasheet(HTML) 7 Page - Maxim Integrated Products |
7 / 18 page Detailed Description The MAX8845Z/MAX8845Y chargers use voltage, cur- rent, and thermal-control loops to charge a single Li+ cell and protect the battery (Figure 1). When a Li+ bat- tery with a cell voltage below 2.5V is inserted, the MAX8845Z/MAX8845Y chargers enter a prequalifica- tion stage where it precharges that cell with 10% of the user-programmed fast-charge current (Figure 2). The CHG indicator is driven low to indicate entry into the prequalification state. When the battery voltage exceeds 2.5V, the charger soft-starts as it enters the fast-charge stage. The fast-charge current level is pro- grammed through a resistor from SETI to GND. As the battery voltage approaches 4.2V, the charging current 28V Linear Li+ Battery Chargers with Battery Detection and Overvoltage Protected Output _______________________________________________________________________________________ 7 OUTPUT DRIVER, CURRENT SENSE, AND LOGIC TEMPERATURE SENSOR VL REGULATOR REF REFOK VIN OVLO VL UVLO VREF VREF LOGIC BATT DETBAT ABI ABO (MAX8845Z ONLY) ABO (MAX8845Y ONLY) EN POK IN BATT IN BATT POK 200k Ω GND EP +115 °C 4.2V Li+ VI/O 200k Ω CHG MAX8845Z MAX8845Y VL VREF IMINREF DETBAT LINEAR REGULATOR WITH OVP SETI MIN SAFEOUT Figure 1. MAX8845Z/MAX8845Y Functional Diagram |
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