RT9535

RT9535 High Efficiency Switching Mode Battery Charger General Description The RT9535 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 programmed by external resistor. The constant voltage output can support up to 22V 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. The RT9535 can charge batteries from 2.5V to 22V with dropout voltage as low as 0.4V. A logic output indicates Li-Ion full charge when current drops to 17% of the full-scale programmed charge current. The RT9535 is available in the WQFN-24L 4x4 package. Features  Fast Charging for Li-Ion, NiMH and NiCd Batteries  Adjustable Battery Voltages from 2.5V to 22V  High Efficiency : Up to 95%  Charging Current Programmed by Resistor  Precision 0.5% Charging Voltage Accuracy  Provide 5% Charging Current Accuracy  Input Current Limit Maximizes Charging Rate  500kHz Switching Frequency  Flag Indicates Li-Ion Charge Completion  Auto Shutdown with Adapter Removal  Only 10A Battery Reverse Current when Idle Applications  Notebook Computers  Portable Instruments  Chargers for Li-lon, NiMH, NiCd and Lead Acid Rechargeable Batteries Simplified Application Circuit M1 RS4 VIN CIN R2 C1 C2 R1 ...