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The RT9527L is a low cost single-cell Li-ion charger for low current charge applications.<br /><br />The RT9527L can be powered up by an AC adapter or USB (Universal Serial Bus) port inputs. The RT9527L enters sleep mode when VIN power is removed. The RT9527L optimizes the charging task by using a control algorithm, which includes pre-charge mode, fast-charge mode and constant voltage mode. The charging task is kept in constant voltage mode to hold the battery in a full charge condition. The charge current is adjustable via an external resistor. The internal thermal feedback circuitry regulates the die temperature to optimize the charge rate for all ambient temperatures. The RT9527L features 28V maximum rating voltages for VIN. Other features include under-voltage protection and over-voltage protection for the AC adapter supply.<br /><br />The RT9527L is available in the small thermally enhanced WDFN-8L 2x2 package. The recommended junction temperature range is -40°C to 125°C, and the ambient temperature range is -40°C to 85°C.
RT9527L Typical Circuit
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<div class="spec-list"><ul class="lv1"><li>28V Maximum Rating for AC Adapter </li><li>Internal Integrated Power FETs </li><li>Adjustable Charging Current </li><li>Programmable Safe Charge Timer </li><li>NTC Thermistor Input </li><li>Battery Reverse Protection </li><li>ISET Pin Short Protection </li><li>Charge Status Indicator </li><li>AC Adapter Power Good Status Indicator </li><li>End of Charge Current is 10% of Fast-Charge Current </li><li>Under-Voltage Protection </li><li>Over-Voltage Protection </li><li>Thermal Feedback Optimized Charge Rate </li><li>RoHS Compliant and Halogen Free </li></ul></div>
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<div class="spec-list"><ul class="lv1"><li>Cellular Phones </li><li>Digital Cameras </li><li>PDAs and Smart Phone </li><li>Portable Instruments </li></ul></div>
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