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The RT9531 is a PWM switch mode battery charger controller to fast charge single or multiple Li-Ion, NiMH and NiCd batteries, using constant current or constant voltage control. Maximum current can be easily adjusted by external resistor. The constant voltage output can support up to 4 Li-Ion cells with 0.5% accuracy. A third control loop limits the input current drawing from the adapter during charging. This allows simultaneous operation of the equipment and fast battery charging without over loading to the adapter. </p>The RT9531 can charge batteries from 2.5V to 4.2V with dropout voltage as low as 0.4V. A diode is not required in series with the battery because the charger automatically enters a 10μA sleep mode when the adapter is unplugged. A logic output indicates Li-Ion full charge when current drops to 20% of the full-scale adjusted charge current.</p>
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<div class="spec-list"><ul class="lv1"><li>Fast Charging for Li-Ion, NiMH and NiCd Batteries </li><li>Preset Battery Voltages : 4.2V </li><li>High Efficiency : Up to 95% </li><li>Precision 0.5% Charging Voltage Accuracy </li><li>5% Charging Current Accuracy </li><li>Charging Current Adjusted by Resistor </li><li>0.4V Dropout Voltage </li><li>Input Current Limit Maximizes Charging Rate </li><li>475kHz Switching Frequency </li><li>Flag Indicates Li-Ion Charge Completion </li><li>Auto Shutdown with Adapter Removal </li><li>Only 10μA Battery Drain When Idle </li><li>Available in an WQFN-16L 4x4 Package </li><li>RoHS Compliant and Halogen Free </li></ul></div>
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<div class="spec-list"><ul class="lv1"><li>Notebook Computers </li><li>Portable Instruments </li><li>Chargers for Li-Ion, NiMH, NiCd and Lead Acid Rechargeable Batteries </li></ul></div>
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