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MAX8804YETA+ Datasheet(PDF) 8 Page - Maxim Integrated Products |
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MAX8804YETA+ Datasheet(HTML) 8 Page - Maxim Integrated Products |
8 / 17 page High-Voltage, Dual-Input, USB/AC Adapter Chargers in 2mm x 3mm TDFN 8 _______________________________________________________________________________________ Detailed Description The MAX8804W/MAX8804Y/MAX8804Z dual-input linear battery chargers use voltage, current, and thermal-con- trol loops to charge and protect a single Li+ battery. When a Li+ battery with a cell voltage below 2.5V is inserted, the MAX8804W/MAX8804Z chargers enter the prequalification stage where they precharge that cell with 95mA (Figure 2). The CHG indicator output is dri- ven low to indicate entry into the prequalification state. When battery voltage exceeds 2.5V, the charger soft- starts as it enters the fast-charge stage. The MAX8804Y eliminates the prequalification state and enters fast- charge when the battery is inserted. The fast-charge cur- rent level is programmed by a simple single-wire interface. As the battery voltage approaches 4.2V, the charging current is reduced. If the battery current drops below the top-off current threshold, the CHG indicator goes high impedance, signaling that the battery is fully charged. The ICs then enter a constant voltage-regula- tion mode to maintain the battery at full charge. The MAX8804W/MAX8804Y/MAX8804Z automatically select between either a USB or AC adapter input source. The AC adapter charge current is programmable from 400mA to 700mA in 50mA steps through a simple single- wire interface (see Tables 2 and 3). The USB charge cur- rent is programmable to 95mA, 380mA, or 475mA through the same interface (see Tables 4 and 5). DC AND USB OUTPUT CONTROL LOGIC CONTROL DC USB BAT SET POK CHG <USBPWR> 4.15V TO 30V 4.15V TO 16V TEMP SENSOR +105 °C VOLTAGE LOOP BIAS CIRCUIT REF GND OVERVOLTAGE PROTECTION Li+ MAX8804Y MAX8804Z DC POK USB POK (DETBAT) NOTE: ( ) FOR MAX8804W ONLY < > FOR MAX8804Y/MAX8804Z ONLY Figure 1. Functional Diagram |
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Similar Description - MAX8804YETA+ |
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