® RT9531
High Efficiency Switching Mode Battery Charger
General Description
The RT9531 is a PWM switch mode battery ch...
® RT9531
High Efficiency Switching Mode Battery Charger
General Description
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.
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.
Marking Information
1X=YM DNN
1X= : Product Code YMDNN : Date Code
Features
Fast Charging for Li-Ion, NiMH and NiCd Batteries Preset Battery
Voltages : 4.2V High Efficiency : Up to 95% Precision 0.5% Charging
Voltage Accuracy 5% Charging Current Accuracy Charging Current Adjusted by Resistor 0.4V Dropout
Voltage Input Current Limit Maximizes Charging Rate 475kHz Switching Frequency Flag Indicates Li-Ion Charge Completion Auto Shutdown with Adapter Removal Only 10μA Battery Drain When Idle Available in an WQFN-16L 4x4 Packa...